Pub Date : 2023-04-18DOI: 10.3391/ai.2023.18.1.103389
Michele D. Larson, Daniel J. Greenwood, Kara Flanigan, A. Krist
Environmental conditions promoting the occurrence and high abundance of non-native taxa are linked to critical stages of species invasions: establishment, whether a site can sustain a population of the non-native taxon, and impact, the extent to which the consequences of establishment negatively affect the invaded ecosystem. Using surveys across environmental gradients, we examined the physicochemical conditions associated with the occurrence and abundance of the invasive New Zealand mudsnail (Potamopyrgus antipodarum) and co-occurring native mollusks. Abundance of Potamopyrgus very strongly increased with stream width and conductivity (specifically with chloride, sulfate, potassium, and sodium ions). Also, Potamopyrgus were most likely to occur at sites with relatively low pH and water velocity and relatively high calcium ion concentration and abundance also slightly increased in these conditions. The physicochemical conditions indicate the characteristics of sites that are suitable for establishment and secondary spread of Potamopyrgus. Native mollusks differed from Potamopyrgus in the physicochemical conditions associated with abundance suggesting that variation among habitats could permit native mollusks to persist at larger geographic scales even if they often co-occur with Potamopyrgus. Abundance of native Physa moderately decreased with abundance of Potamopyrgus. Because abundance of Physa and Potamopyrgus responded oppositely to stream width and conductivity, the negative relationship between the abundance of these two taxa may be caused by contrasting responses to physicochemical conditions, acting alone or in concert with biotic interactions.
{"title":"Field surveys reveal physicochemical conditions promoting occurrence and high abundance of an invasive freshwater snail (Potamopyrgus antipodarum)","authors":"Michele D. Larson, Daniel J. Greenwood, Kara Flanigan, A. Krist","doi":"10.3391/ai.2023.18.1.103389","DOIUrl":"https://doi.org/10.3391/ai.2023.18.1.103389","url":null,"abstract":"Environmental conditions promoting the occurrence and high abundance of non-native taxa are linked to critical stages of species invasions: establishment, whether a site can sustain a population of the non-native taxon, and impact, the extent to which the consequences of establishment negatively affect the invaded ecosystem. Using surveys across environmental gradients, we examined the physicochemical conditions associated with the occurrence and abundance of the invasive New Zealand mudsnail (Potamopyrgus antipodarum) and co-occurring native mollusks. Abundance of Potamopyrgus very strongly increased with stream width and conductivity (specifically with chloride, sulfate, potassium, and sodium ions). Also, Potamopyrgus were most likely to occur at sites with relatively low pH and water velocity and relatively high calcium ion concentration and abundance also slightly increased in these conditions. The physicochemical conditions indicate the characteristics of sites that are suitable for establishment and secondary spread of Potamopyrgus. Native mollusks differed from Potamopyrgus in the physicochemical conditions associated with abundance suggesting that variation among habitats could permit native mollusks to persist at larger geographic scales even if they often co-occur with Potamopyrgus. Abundance of native Physa moderately decreased with abundance of Potamopyrgus. Because abundance of Physa and Potamopyrgus responded oppositely to stream width and conductivity, the negative relationship between the abundance of these two taxa may be caused by contrasting responses to physicochemical conditions, acting alone or in concert with biotic interactions.","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"7 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86558899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Atractolytocestus huronensis Anthony, 1958 has been co-introduced with its cyprinid host Cyprinus carpio Linnaeus, 1758, common carp, to several continents. This cestode was only recently (2012) detected in South Africa and occur in two major river systems. In Africa, A. huronensis has only been reported from C. carpio . During routine parasitological surveys in the Vaal River system in central South Africa, unidentified cestodes were recorded from common carp at several localities. Using light and scanning electron microscopy, alongside genetic characterisation, they were identified as A. huronensis , greatly expanding the distribution of this parasite in the upper reaches of the Vaal River system and indicating rapid spread in the system. Thereafter, in November 2020, more caryophyllidean cestodes were detected infecting native smallmouth yellowfish, Labeobarbus aeneus (Burchell, 1822) just below the Vaal Dam wall. They were also morphologically and genetically identified as A. huronensis , indicating a possible new definitive host and spillover from carp. However, only juvenile worms (up to late stage 4) were detected in L. aeneus , suggesting a paradefinitive or accidental infection. Their pathological effect on the intestine of L. aeneus mimicked that described in acute infections in common carp, with damage limited to the intestinal epithelium and no prominent ulcerations. This apparent mild infection of an indigenous host needs to be monitored. The spillover to L. aeneus appears to be recent as no caryophyllidean cestodes were collected from this host species at the same locality and season the previous year, nor at any of the other well studied sites in the Vaal River system. Chronic infection of L. aeneus may still develop and indicate that the near threatened largemouth yellowfish, Labeobarbus kimberleyensis (Gilchrist & Thompson, 1913), may be at risk as well.
{"title":"Smallmouth yellowfish, Labeobarbus aeneus (Teleostei: Cyprinidae), as a potential new definitive host of the invasive parasite Atractolytocestus huronensis (Cestoda: Caryophyllidea) from common carp: example of recent spillover in South Africa?","authors":"Q. D. Dos Santos, A. Avenant‐Oldewage","doi":"10.3391/ai.2022.17.2.08","DOIUrl":"https://doi.org/10.3391/ai.2022.17.2.08","url":null,"abstract":"Atractolytocestus huronensis Anthony, 1958 has been co-introduced with its cyprinid host Cyprinus carpio Linnaeus, 1758, common carp, to several continents. This cestode was only recently (2012) detected in South Africa and occur in two major river systems. In Africa, A. huronensis has only been reported from C. carpio . During routine parasitological surveys in the Vaal River system in central South Africa, unidentified cestodes were recorded from common carp at several localities. Using light and scanning electron microscopy, alongside genetic characterisation, they were identified as A. huronensis , greatly expanding the distribution of this parasite in the upper reaches of the Vaal River system and indicating rapid spread in the system. Thereafter, in November 2020, more caryophyllidean cestodes were detected infecting native smallmouth yellowfish, Labeobarbus aeneus (Burchell, 1822) just below the Vaal Dam wall. They were also morphologically and genetically identified as A. huronensis , indicating a possible new definitive host and spillover from carp. However, only juvenile worms (up to late stage 4) were detected in L. aeneus , suggesting a paradefinitive or accidental infection. Their pathological effect on the intestine of L. aeneus mimicked that described in acute infections in common carp, with damage limited to the intestinal epithelium and no prominent ulcerations. This apparent mild infection of an indigenous host needs to be monitored. The spillover to L. aeneus appears to be recent as no caryophyllidean cestodes were collected from this host species at the same locality and season the previous year, nor at any of the other well studied sites in the Vaal River system. Chronic infection of L. aeneus may still develop and indicate that the near threatened largemouth yellowfish, Labeobarbus kimberleyensis (Gilchrist & Thompson, 1913), may be at risk as well.","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"22 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88239951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Meredyth Duncan, B. Chow, Kevin Myron, Jaden Stone, Mark Hubbell, Elizabeth Schriock, Carol Hunt, Kent Khtikian, Sarah Cohen
Several taxa forming a species complex within the bryozoan genus Watersipora are successful global marine invaders that are common in marine fouling communities in bays and harbors. This species complex has recently been recorded spreading to natural intertidal and subtidal habitats on the central California outer coast near the San Francisco Bay, suggesting that its invasive potential is greater than previously believed. To determine the species and clades present in these outer coast populations, and their relationship to populations in nearby bays and harbors, we produced COI sequences for a set of new Watersipora specimens sampled from four rocky intertidal sites, for which there is currently no published genetic data. Watersipora subtorquata and Watersipora new species were both identified at rocky intertidal sites. All haplotypes identified in this analysis have previously been reported in California harbors and marinas, suggesting that intertidal populations may be sourced from existing populations in harbors, rather than representing independent invasions. Field observations of intertidal populations support Watersipora ’s year-round persistence at rocky intertidal sites , which has significant implications for invasion dynamics and invasion management strategies. Continued sequencing of outer coast Watersipora samples will be crucial to further characterize the genetic diversity and structure of these coastal populations and describe the dynamics of Watersipora ’s outer coast spread.
{"title":"First report of genetic data from two invasive Watersipora (Bryozoa) species in the central California coast rocky intertidal","authors":"Meredyth Duncan, B. Chow, Kevin Myron, Jaden Stone, Mark Hubbell, Elizabeth Schriock, Carol Hunt, Kent Khtikian, Sarah Cohen","doi":"10.3391/ai.2022.17.2.01","DOIUrl":"https://doi.org/10.3391/ai.2022.17.2.01","url":null,"abstract":"Several taxa forming a species complex within the bryozoan genus Watersipora are successful global marine invaders that are common in marine fouling communities in bays and harbors. This species complex has recently been recorded spreading to natural intertidal and subtidal habitats on the central California outer coast near the San Francisco Bay, suggesting that its invasive potential is greater than previously believed. To determine the species and clades present in these outer coast populations, and their relationship to populations in nearby bays and harbors, we produced COI sequences for a set of new Watersipora specimens sampled from four rocky intertidal sites, for which there is currently no published genetic data. Watersipora subtorquata and Watersipora new species were both identified at rocky intertidal sites. All haplotypes identified in this analysis have previously been reported in California harbors and marinas, suggesting that intertidal populations may be sourced from existing populations in harbors, rather than representing independent invasions. Field observations of intertidal populations support Watersipora ’s year-round persistence at rocky intertidal sites , which has significant implications for invasion dynamics and invasion management strategies. Continued sequencing of outer coast Watersipora samples will be crucial to further characterize the genetic diversity and structure of these coastal populations and describe the dynamics of Watersipora ’s outer coast spread.","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"86 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80801341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Ludányi, E. Peeters, B. Kiss, Á. Gáspár, I. Roessink, T. Magura, Z. Müller
The freshwater crayfish Pacifastacus leniusculus is among the most widespread invasive crayfish species in Europe. Pacifastacus leniusculus invaded Hungary around 1998 and here we investigated the recent expansion of this species and its impact on other aquatic macroinvertebrates. The colonization of watercourses throughout Europe by the signal crayfish resulted in negative impacts on the present aquatic communities. Our investigation (i.e. in Rába, Pinka, Gyöngyös-stream, Répce, Arany-stream and Strém systems) revealed that the distribution range of signal crayfish is still in expansion in the western part of Hungary and in all likelihood impacting the aquatic communities in these watercourses. Our results obviously demonstrated that signal crayfish densities were highest in habitats with gravel or coarse particulate organic matter, which seems to reflect a species-specific habitat preference. Our investigation proved that the presence of P. leniusculus had negative effects on a number of protected species such as Calopteryx virgo and Onychogomphus forcipatus next to a significant negative effect on the Odonata and Trichoptera species richness as well as on the abundances of Ephemeroptera, Odonata and Trichoptera. Our study in Hungary supports the notion of the significant negative impact of signal crayfish on native freshwater invertebrate communities throughout Europe. In order to assess whether these impacts are restricted to fast flowing waters only, an adequate monitoring plan providing more knowledge on this species with respect to biotic and abiotic preferences and aquatic macroinvertebrate composition is required.
{"title":"The current status of Pacifastacus leniusculus (Dana, 1852) and their effect on aquatic macroinvertebrate communities in Hungarian watercourses","authors":"M. Ludányi, E. Peeters, B. Kiss, Á. Gáspár, I. Roessink, T. Magura, Z. Müller","doi":"10.3391/ai.2022.17.4.05","DOIUrl":"https://doi.org/10.3391/ai.2022.17.4.05","url":null,"abstract":"The freshwater crayfish Pacifastacus leniusculus is among the most widespread invasive crayfish species in Europe. Pacifastacus leniusculus invaded Hungary around 1998 and here we investigated the recent expansion of this species and its impact on other aquatic macroinvertebrates. The colonization of watercourses throughout Europe by the signal crayfish resulted in negative impacts on the present aquatic communities. Our investigation (i.e. in Rába, Pinka, Gyöngyös-stream, Répce, Arany-stream and Strém systems) revealed that the distribution range of signal crayfish is still in expansion in the western part of Hungary and in all likelihood impacting the aquatic communities in these watercourses. Our results obviously demonstrated that signal crayfish densities were highest in habitats with gravel or coarse particulate organic matter, which seems to reflect a species-specific habitat preference. Our investigation proved that the presence of P. leniusculus had negative effects on a number of protected species such as Calopteryx virgo and Onychogomphus forcipatus next to a significant negative effect on the Odonata and Trichoptera species richness as well as on the abundances of Ephemeroptera, Odonata and Trichoptera. Our study in Hungary supports the notion of the significant negative impact of signal crayfish on native freshwater invertebrate communities throughout Europe. In order to assess whether these impacts are restricted to fast flowing waters only, an adequate monitoring plan providing more knowledge on this species with respect to biotic and abiotic preferences and aquatic macroinvertebrate composition is required.","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"19 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82112760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Trophically-transmitted endoparasites can manipulate the behavior of intermediate hosts to increase transmission to definitive hosts. Less clear, however, is whether these relationships exist when parasites and hosts have limited coevolutionary history, e.g., a native parasite infecting an invasive host. We investigated infection by the northeastern North American trematode Microphallus similis in non-native green crabs ( Carcinus maenas ) to assess whether infection by M. similis influenced feeding behaviors in C. maenas and if this changed with time post-infection. We manipulated infection by randomly assigning crabs to parasite exposure and control groups. We then measured individual crab behavior at five time points (pre-infection, 72 h, 1 week, 2 week, and 3 week post-infection) with an established ethogram that recorded multiple behavioral types. We also conducted righting response trials at each time point and additionally at 4 and 5 weeks post-exposure. Compared to controls, infected crabs showed little difference in recorded behaviors, and burden of infection (i.e., number of trematode cysts) was not correlated to any behavioral metric. This lack of behavioral impact occurred at all stages of infection. Active parasite penetration/establishment early in the infection process did not provoke greater behavioral response than later stages, when the encysted parasite becomes relatively dormant. Although M. similis is capable of infecting non-native C. maenas , our results suggest that it does not manipulate host behavior, possibly because of limited coevolutionary history with C. maenas in the region, or because host manipulation is unnecessary for successful completion of its life cycle. In nature, this may have implications for the crab’s invasion success in the western Atlantic, where it has escaped much of its native parasite diversity.
{"title":"Trematode parasites have minimal effect on the behavior of invasive green crabs","authors":"Hyejoo Ro, A. Fowler, Chelsea Wood, A. Blakeslee","doi":"10.3391/ai.2022.17.2.07","DOIUrl":"https://doi.org/10.3391/ai.2022.17.2.07","url":null,"abstract":"Trophically-transmitted endoparasites can manipulate the behavior of intermediate hosts to increase transmission to definitive hosts. Less clear, however, is whether these relationships exist when parasites and hosts have limited coevolutionary history, e.g., a native parasite infecting an invasive host. We investigated infection by the northeastern North American trematode Microphallus similis in non-native green crabs ( Carcinus maenas ) to assess whether infection by M. similis influenced feeding behaviors in C. maenas and if this changed with time post-infection. We manipulated infection by randomly assigning crabs to parasite exposure and control groups. We then measured individual crab behavior at five time points (pre-infection, 72 h, 1 week, 2 week, and 3 week post-infection) with an established ethogram that recorded multiple behavioral types. We also conducted righting response trials at each time point and additionally at 4 and 5 weeks post-exposure. Compared to controls, infected crabs showed little difference in recorded behaviors, and burden of infection (i.e., number of trematode cysts) was not correlated to any behavioral metric. This lack of behavioral impact occurred at all stages of infection. Active parasite penetration/establishment early in the infection process did not provoke greater behavioral response than later stages, when the encysted parasite becomes relatively dormant. Although M. similis is capable of infecting non-native C. maenas , our results suggest that it does not manipulate host behavior, possibly because of limited coevolutionary history with C. maenas in the region, or because host manipulation is unnecessary for successful completion of its life cycle. In nature, this may have implications for the crab’s invasion success in the western Atlantic, where it has escaped much of its native parasite diversity.","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"26 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77966913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the wake of biological globalization, translocated species of high bio-engineering capacity increasingly change bottom topography of sedimentary coasts. A Vaucheria taxon (Xanthophyceae) of unknown origin is spreading at the transition between intertidal and subtidal zones, while resident Vaucheria -species are confined to the upper shore in the Wadden Sea (European Atlantic). Near the island of Sylt, dense turfs of green filaments rapidly expanded over an area of 180 ha within 3 years. The unicellular filaments reach about 5 cm out of and 5 cm into the sediment. Felted rhizoids provide firm anchorage. Dry phytomass (up to 208 g m -2 ) was similar to that of intertidal seagrass beds. Residual filaments overwinter in the sediment and give rise to renewed growth in late spring. In addition, oospores germinate. Fine particles are trapped by the turf during summer, generating laminated cohesive mud. Muddy hummocks arise up to 20 cm above ambient sand flats, alternating with troughs but gradually merge into coherent and pertinacious plateaus of mud. This shift in bottom topography and sediment composition may potentially change the mud balance of tidal basins, and the capacity of tidal flats in catching up with accelerating sea-level rise.
随着生物全球化的发展，高生物工程能力的易位物种日益改变着沉积海岸的底部地形。在潮间带和潮下带之间的过渡地带，一个来源不明的沃切利亚分类群(叶黄科)正在扩散，而沃切利亚的常住物种则局限于瓦登海(欧洲大西洋)的上游。在锡尔特岛附近，密集的绿色草皮在3年内迅速扩大到180公顷的面积。单细胞细丝向沉积物外约5厘米，向沉积物内约5厘米。毡状根状体提供牢固的锚定。干生物量(高达208 g m -2)与潮间带海草床相似。残留的细丝在沉积物中越冬，并在晚春重新生长。此外，卵孢子也会发芽。夏季，细小颗粒被草皮捕获，形成层状粘性泥浆。泥泞的小丘高出周围的沙地20厘米，与沟槽交替，但逐渐合并成连贯而顽固的泥高原。海底地形和沉积物组成的这种变化可能会潜在地改变潮汐盆地的泥浆平衡，以及潮滩赶上海平面加速上升的能力。
{"title":"Invading grass-like alga transforms rippled sand bars into bumpy muddy flats: arrival of a game changer in the Wadden Sea?","authors":"K. Reise, Rune Michaelis, N. Rybalka","doi":"10.3391/ai.2022.17.1.01","DOIUrl":"https://doi.org/10.3391/ai.2022.17.1.01","url":null,"abstract":"In the wake of biological globalization, translocated species of high bio-engineering capacity increasingly change bottom topography of sedimentary coasts. A Vaucheria taxon (Xanthophyceae) of unknown origin is spreading at the transition between intertidal and subtidal zones, while resident Vaucheria -species are confined to the upper shore in the Wadden Sea (European Atlantic). Near the island of Sylt, dense turfs of green filaments rapidly expanded over an area of 180 ha within 3 years. The unicellular filaments reach about 5 cm out of and 5 cm into the sediment. Felted rhizoids provide firm anchorage. Dry phytomass (up to 208 g m -2 ) was similar to that of intertidal seagrass beds. Residual filaments overwinter in the sediment and give rise to renewed growth in late spring. In addition, oospores germinate. Fine particles are trapped by the turf during summer, generating laminated cohesive mud. Muddy hummocks arise up to 20 cm above ambient sand flats, alternating with troughs but gradually merge into coherent and pertinacious plateaus of mud. This shift in bottom topography and sediment composition may potentially change the mud balance of tidal basins, and the capacity of tidal flats in catching up with accelerating sea-level rise.","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"95 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84769130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hui Wei, Fei Liu, L. Vilizzi, L. Wood, Yinchang Hu, G. Copp
Plasticity in growth and life-history traits is an important attribute of non-native (NN) fishes, facilitating their adaptation to novel environments. Few studies have investigated geographical variations in multiple biological traits and the factors affecting the variations. In this study, variations in multiple biological traits of NN sailfin catfishes Pterygoplichthys spp. were investigated in the main river basins of the Guangdong and Hainan provinces of South China. The impacts of environmental factors on the biological traits were analysed using general linear modeling and an informationtheoretic approach. Among-basin differences in population growth was observed, with richness of competitor fishes negatively affecting growth, maturity and reproductive traits – this suggests biotic resistance was mediated by competition with native fishes. These traits were positively affected by total phosphorus concentration, which is indicative of bottom-up effects, mediated by inorganic nutrients, potentially playing an important role in the invasion success of NN fish. In population level, a bet-hedging strategy was observed in sailfin catfishes under unfavourable environment conditions (e.g. Nangdujiang), whereas a “master-of-some” strategy was found under favourable conditions (e.g. Pearl River Delta and Western Basin). The results suggested that plasticity in multiple biological traits of sailfin catfishes is an important strategy to overcome changing environmental conditions in different rivers, and habitat-specific variations across river basins would reflect trade-offs amongst traits at the population level. Therefore, habitat-specific management measures, adapted to the invaded ecosystem’s features and the life-history strategy of the NN species, could provide an effective means to control invasive species.
{"title":"Environmental related variation in growth and life-history traits of non-native sailfin catfishes (Pterygoplichthys spp.) across river basins of South China","authors":"Hui Wei, Fei Liu, L. Vilizzi, L. Wood, Yinchang Hu, G. Copp","doi":"10.3391/ai.2022.17.1.06","DOIUrl":"https://doi.org/10.3391/ai.2022.17.1.06","url":null,"abstract":"Plasticity in growth and life-history traits is an important attribute of non-native (NN) fishes, facilitating their adaptation to novel environments. Few studies have investigated geographical variations in multiple biological traits and the factors affecting the variations. In this study, variations in multiple biological traits of NN sailfin catfishes Pterygoplichthys spp. were investigated in the main river basins of the Guangdong and Hainan provinces of South China. The impacts of environmental factors on the biological traits were analysed using general linear modeling and an informationtheoretic approach. Among-basin differences in population growth was observed, with richness of competitor fishes negatively affecting growth, maturity and reproductive traits – this suggests biotic resistance was mediated by competition with native fishes. These traits were positively affected by total phosphorus concentration, which is indicative of bottom-up effects, mediated by inorganic nutrients, potentially playing an important role in the invasion success of NN fish. In population level, a bet-hedging strategy was observed in sailfin catfishes under unfavourable environment conditions (e.g. Nangdujiang), whereas a “master-of-some” strategy was found under favourable conditions (e.g. Pearl River Delta and Western Basin). The results suggested that plasticity in multiple biological traits of sailfin catfishes is an important strategy to overcome changing environmental conditions in different rivers, and habitat-specific variations across river basins would reflect trade-offs amongst traits at the population level. Therefore, habitat-specific management measures, adapted to the invaded ecosystem’s features and the life-history strategy of the NN species, could provide an effective means to control invasive species.","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"2006 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82445476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mangrove forests worldwide have been subjected to biological invasion. Invasive apple snails ( Pomacea canaliculata ) have established populations in some mangrove forests. The feeding behavior of P. canaliculata in mangroves has been unclear until now. The feeding electivity of P. canaliculata to mangrove leaves, including leaves from Acanthus ilicifolius, Acrostichum aureum, Kandelia candel, Aegiceras corniculatum, and Sonneratia apetala , was studied through a selective test, a non-selective test, and a T-tube test. The growth indicators, the feeding ratio, the feeding rate, the feeding amount, the electivity indicator, and the electivity frequency were determined. The weight increase ratios of P. canaliculata that consumed leaves of A. ilicifolius and A. aureum were higher than those that consumed leaves of K. candel, S. apetala , and A. corniculatum . The electivity indicator showed that P. canaliculata preferred A. ilicifolius leaves and fed little on A. corniculatum leaves. Acrostichum aureum leaves were the second most preferred food for the apple snails. The feeding electivity of P. canaliculata to leaves from five species of mangrove trees was significantly differentiated by cluster analysis, redundancy analysis, and principal component analysis. Eight feeding indicators of the apple snails were positively correlated with the leaf characteristics of nitrogen content, protein content, leaf area, moisture content, and aspect ratio and negatively correlated with the lignin, phenolic, and tannin contents. Pomacea canaliculata could discriminate mangrove leaves through physical and chemical characteristics and shift feeding electivity among mangrove leaves under intraspecific competition. Mangrove forests composed mainly of A. ilicifolius and A. aureum might be at risk of invasion by P. canaliculata . A detailed survey on benthic animals is necessary to monitor and prevent P. canaliculata invasion in mangroves.
{"title":"Palatability of mangrove leaves to invasive apple snails: the relation between feeding electivity and multiple plant characteristics","authors":"Jinling Liu, Benliang Zhao, Y. Li, Xiaoyu Deng, Yue Qiao, Jingting Xu, Siqi Xu","doi":"10.3391/ai.2022.17.2.09","DOIUrl":"https://doi.org/10.3391/ai.2022.17.2.09","url":null,"abstract":"Mangrove forests worldwide have been subjected to biological invasion. Invasive apple snails ( Pomacea canaliculata ) have established populations in some mangrove forests. The feeding behavior of P. canaliculata in mangroves has been unclear until now. The feeding electivity of P. canaliculata to mangrove leaves, including leaves from Acanthus ilicifolius, Acrostichum aureum, Kandelia candel, Aegiceras corniculatum, and Sonneratia apetala , was studied through a selective test, a non-selective test, and a T-tube test. The growth indicators, the feeding ratio, the feeding rate, the feeding amount, the electivity indicator, and the electivity frequency were determined. The weight increase ratios of P. canaliculata that consumed leaves of A. ilicifolius and A. aureum were higher than those that consumed leaves of K. candel, S. apetala , and A. corniculatum . The electivity indicator showed that P. canaliculata preferred A. ilicifolius leaves and fed little on A. corniculatum leaves. Acrostichum aureum leaves were the second most preferred food for the apple snails. The feeding electivity of P. canaliculata to leaves from five species of mangrove trees was significantly differentiated by cluster analysis, redundancy analysis, and principal component analysis. Eight feeding indicators of the apple snails were positively correlated with the leaf characteristics of nitrogen content, protein content, leaf area, moisture content, and aspect ratio and negatively correlated with the lignin, phenolic, and tannin contents. Pomacea canaliculata could discriminate mangrove leaves through physical and chemical characteristics and shift feeding electivity among mangrove leaves under intraspecific competition. Mangrove forests composed mainly of A. ilicifolius and A. aureum might be at risk of invasion by P. canaliculata . A detailed survey on benthic animals is necessary to monitor and prevent P. canaliculata invasion in mangroves.","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"7 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88392235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Agnieszka Kolada, A. Pasztaleniec, A. Bielczyńska, S. Kutyła
Nuttall’s waterweed ( Elodea nuttallii ) is an aquatic plant native to North America. In Poland, the species was first identified in the early 1990s and since then it has started to spread in surface waters. We investigated one of the six lakes in Poland (Probarskie Lake), which were reported to be invaded by E. nuttallii among all the lakes monitored in the period 2005–2016. Based on our field survey data (2019 and 2020) and historical monitoring data (2011 and 2017), we explored the rate of invasion, the effects on taxonomic composition, spatial structure, and abundance of biological assemblages, and the ecological status assessment of this new incomer. We surveyed the lake for macrophytes, phytoplankton and macrozoobenthos for two subsequent years using the field protocols applied in lake monitoring in Poland. Water physicochemistry, planktonic algae and benthic invertebrates were sampled at the sites that were invaded and uninvaded by E. nuttallii , and phytoplankton and physicochemistry also in pelagic sites. Nuttall’s waterweed was identified in Probarskie Lake in 2017 for the first time, occupying about 30% of the phytolittoral area, while in 2019 and 2020, it dominated the macrophyte community, occupying over 80% of the total hydrophyte area. The appearance of the alien invader and its relatively fast taking over of the dominance in the macrophyte community were not reflected in the bioassessment results. None of the analysed biological assemblages truly mirrored the severe changes in macrophyte taxonomic composition among the sampling sites as well as over the subsequent years. As the spread of E. nuttallii is anticipated to increase in Polish waters, there is an urgent need for verification of ecological status assessment methods to improve their diagnostic capacity to capture the problem of ecological invasions.
{"title":"Taking over the dominance of the macrophyte community by Elodea nuttallii (Planch.) H. St. John is poorly reflected in ecological status assessment results","authors":"Agnieszka Kolada, A. Pasztaleniec, A. Bielczyńska, S. Kutyła","doi":"10.3391/ai.2022.17.4.04","DOIUrl":"https://doi.org/10.3391/ai.2022.17.4.04","url":null,"abstract":"Nuttall’s waterweed ( Elodea nuttallii ) is an aquatic plant native to North America. In Poland, the species was first identified in the early 1990s and since then it has started to spread in surface waters. We investigated one of the six lakes in Poland (Probarskie Lake), which were reported to be invaded by E. nuttallii among all the lakes monitored in the period 2005–2016. Based on our field survey data (2019 and 2020) and historical monitoring data (2011 and 2017), we explored the rate of invasion, the effects on taxonomic composition, spatial structure, and abundance of biological assemblages, and the ecological status assessment of this new incomer. We surveyed the lake for macrophytes, phytoplankton and macrozoobenthos for two subsequent years using the field protocols applied in lake monitoring in Poland. Water physicochemistry, planktonic algae and benthic invertebrates were sampled at the sites that were invaded and uninvaded by E. nuttallii , and phytoplankton and physicochemistry also in pelagic sites. Nuttall’s waterweed was identified in Probarskie Lake in 2017 for the first time, occupying about 30% of the phytolittoral area, while in 2019 and 2020, it dominated the macrophyte community, occupying over 80% of the total hydrophyte area. The appearance of the alien invader and its relatively fast taking over of the dominance in the macrophyte community were not reflected in the bioassessment results. None of the analysed biological assemblages truly mirrored the severe changes in macrophyte taxonomic composition among the sampling sites as well as over the subsequent years. As the spread of E. nuttallii is anticipated to increase in Polish waters, there is an urgent need for verification of ecological status assessment methods to improve their diagnostic capacity to capture the problem of ecological invasions.","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"41 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78177026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. Hansen, E. Ieshko, J. Rusch, I. Samokhvalov, V. Melnik, N. Mugue, S. Sokolov, A. Parshukov
The monogenean freshwater parasite Gyrodactylus salaris Malmberg, 1957 is endemic to Atlantic salmon ( Salmo salar ) east of the Baltic Sea, but has spread outside this area via transport and stocking of fish. In Norway and Russia, infections with G. salaris have had catastrophic consequences for many salmon populations. The parasite is also common on farmed rainbow trout ( Oncorhynchus mykiss ) where it can persist in low numbers and without clinical signs. The transport and movement of infected rainbow trout is an important factor in the spreading of G. salaris in Europe. Due to increasing interest in establishing rainbow trout farms in White Sea drainages in Murmansky Oblast, Russia, and the potential subsequent unintentional spreading of G. salaris , parasitological examinations of salmonids were carried out. Farmed rainbow trout (n = 48) and Atlantic salmon (n = 375) from River Tuloma and farmed rainbow trout from Lake Imandra (n = 10), were examined in the period from 2015 to 2019. Additionally, environmental DNA monitoring was conducted for the detection of G. salaris in 2018. Gyrodactylus specimens were first detected in 2015 on Atlantic salmon from the tributary River Pak. Specimens obtained from Atlantic salmon in River Tuloma and from rainbow trout in River Tuloma and Lake Imandra the following years were confirmed to be G. salaris by sequencing of the nuclear ribosomal internal transcribed spacer (ITS rDNA) and mitochondrial cytochrome oxidase 1 (COI). All specimens carried the same COI sequence, which was identical to a strain (GenBank Accession number AF479750) frequently found on farmed rainbow trout. The prevalence varied, but reached 100% in some samples. Maximum intensity observed was 899, but intensities were generally lower than intensities expected to lead to mortalities. There was good correspondence between eDNA monitoring and conventional methods. The results indicate that G. salaris has spread to River Tuloma via transport of live rainbow trout.
{"title":"Gyrodactylus salaris Malmberg, 1957 (Monogenea, Gyrodactylidae) spreads further – a consequence of rainbow trout farming in Northern Russia","authors":"H. Hansen, E. Ieshko, J. Rusch, I. Samokhvalov, V. Melnik, N. Mugue, S. Sokolov, A. Parshukov","doi":"10.3391/ai.2022.17.2.06","DOIUrl":"https://doi.org/10.3391/ai.2022.17.2.06","url":null,"abstract":"The monogenean freshwater parasite Gyrodactylus salaris Malmberg, 1957 is endemic to Atlantic salmon ( Salmo salar ) east of the Baltic Sea, but has spread outside this area via transport and stocking of fish. In Norway and Russia, infections with G. salaris have had catastrophic consequences for many salmon populations. The parasite is also common on farmed rainbow trout ( Oncorhynchus mykiss ) where it can persist in low numbers and without clinical signs. The transport and movement of infected rainbow trout is an important factor in the spreading of G. salaris in Europe. Due to increasing interest in establishing rainbow trout farms in White Sea drainages in Murmansky Oblast, Russia, and the potential subsequent unintentional spreading of G. salaris , parasitological examinations of salmonids were carried out. Farmed rainbow trout (n = 48) and Atlantic salmon (n = 375) from River Tuloma and farmed rainbow trout from Lake Imandra (n = 10), were examined in the period from 2015 to 2019. Additionally, environmental DNA monitoring was conducted for the detection of G. salaris in 2018. Gyrodactylus specimens were first detected in 2015 on Atlantic salmon from the tributary River Pak. Specimens obtained from Atlantic salmon in River Tuloma and from rainbow trout in River Tuloma and Lake Imandra the following years were confirmed to be G. salaris by sequencing of the nuclear ribosomal internal transcribed spacer (ITS rDNA) and mitochondrial cytochrome oxidase 1 (COI). All specimens carried the same COI sequence, which was identical to a strain (GenBank Accession number AF479750) frequently found on farmed rainbow trout. The prevalence varied, but reached 100% in some samples. Maximum intensity observed was 899, but intensities were generally lower than intensities expected to lead to mortalities. There was good correspondence between eDNA monitoring and conventional methods. The results indicate that G. salaris has spread to River Tuloma via transport of live rainbow trout.","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"23 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90464966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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