C. Drost, J. Lovich, P. Rosen, M. Malone, S. Garber
{"title":"Non-native pond sliders cause long-term decline of native Sonora mud turtles: a 33-year before-after study in an undisturbed natural environment","authors":"C. Drost, J. Lovich, P. Rosen, M. Malone, S. Garber","doi":"10.3391/ai.2021.16.3.10","DOIUrl":"https://doi.org/10.3391/ai.2021.16.3.10","url":null,"abstract":"","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"89 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80387720","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}
The Indo-West Pacific (IWP) damselfish Neopomacentrus cyanomos was first found in the Atlantic Ocean in 2013, on reefs in Mexico in the southwest Gulf of Mexico (GoMx). By 2018 it was known throughout most of the GoMx, but nowhere else in the Atlantic. Evidence indicates it was introduced to the GoMx by offshore petroleum infrastructure moved in water from its native range, rather than by aquarium-release or commercial shipping. There are three tropical Atlantic areas with offshore petroleum fields in addition to the GoMx: (i) at Trinidad (southeast Caribbean), (ii) at central Brazil, and (iii) at west Africa. Offshore infrastructure moves between those oilfields, and between them and support facilities in the IWP. If N. cyanomos was brought to the Atlantic by such infrastructure relocation, then it could also be at other Atlantic oilfields. To assess that possibility, we surveyed suitable habitat at Trinidad (mid 2019), and nearby Tobago (early 2020). We found N. cyanomos at all sites surveyed at Trinidad, but none at Tobago. At Trinidad this species was common on shallow reefs fringing an aquatic “parking lot” for mobile petroleum infrastructure in the estuarine Gulf of Paria. These observations show that this species has well established, isolated populations at offshore oilfields with very different environments at both ends of the Greater Caribbean and provide strong support for the petro-platform relocation hypothesis relating to its introduction. They also show that N. cyanomos has considerable ecological plasticity, which may be important for its success. The location of the Trinidad population at the head of the Caribbean Current should aid its spread via larval dispersal throughout the region.
{"title":"The Indo-Pacific damselfish Neopomacentrus cyanomos at Trinidad, southeast Caribbean","authors":"Ross Robertson","doi":"10.3391/ai.2021.16.2.03","DOIUrl":"https://doi.org/10.3391/ai.2021.16.2.03","url":null,"abstract":"The Indo-West Pacific (IWP) damselfish Neopomacentrus cyanomos was first found in the Atlantic Ocean in 2013, on reefs in Mexico in the southwest Gulf of Mexico (GoMx). By 2018 it was known throughout most of the GoMx, but nowhere else in the Atlantic. Evidence indicates it was introduced to the GoMx by offshore petroleum infrastructure moved in water from its native range, rather than by aquarium-release or commercial shipping. There are three tropical Atlantic areas with offshore petroleum fields in addition to the GoMx: (i) at Trinidad (southeast Caribbean), (ii) at central Brazil, and (iii) at west Africa. Offshore infrastructure moves between those oilfields, and between them and support facilities in the IWP. If N. cyanomos was brought to the Atlantic by such infrastructure relocation, then it could also be at other Atlantic oilfields. To assess that possibility, we surveyed suitable habitat at Trinidad (mid 2019), and nearby Tobago (early 2020). We found N. cyanomos at all sites surveyed at Trinidad, but none at Tobago. At Trinidad this species was common on shallow reefs fringing an aquatic “parking lot” for mobile petroleum infrastructure in the estuarine Gulf of Paria. These observations show that this species has well established, isolated populations at offshore oilfields with very different environments at both ends of the Greater Caribbean and provide strong support for the petro-platform relocation hypothesis relating to its introduction. They also show that N. cyanomos has considerable ecological plasticity, which may be important for its success. The location of the Trinidad population at the head of the Caribbean Current should aid its spread via larval dispersal throughout the region.","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"90 2","pages":""},"PeriodicalIF":1.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72625222","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}
Jonathan P. Fleming, R. Wersal, J. Madsen, E. Dibble
Aquatic plants (macrophytes) are important components of freshwater ecosystems and serve numerous functions, both physical and biological, that help to structure aquatic communities. However, invasive macrophytes may negatively alter ecosystem properties. Non-native invasive species have been identified as a major cause of biodiversity loss and the increasing prevalence of invasive species has prompted studies to help understand their impacts and to conserve biodiversity. Studying mechanisms of invasion also gives ecological insight into how communities are structured and assembled. This study examined a set of potential factors influencing invasion including biotic resistance, exposure, and water depth using mixed-effects models on macrophyte survey data collected from twenty-nine lakes across the United States. The results of this study indicated that biotic resistance measured from native species richness, exposure due to fetch, and water depth interact, often in non-linear ways to influence probability of invasive species occurrence at a given location; however, models explained a relatively low percentage of variation in probabilities. It is likely that strong predictive principles governing macrophyte invasions do not exist, at least among comparisons across a range of ecosystem types and environmental conditions. However, ecologists should continue to search for general patterns within definable ecosystem units to increase understanding about factors contributing to invasibility.
{"title":"Weak non-linear influences of biotic and abiotic factors on invasive macrophyte occurrence","authors":"Jonathan P. Fleming, R. Wersal, J. Madsen, E. Dibble","doi":"10.3391/AI.2021.16.2.09","DOIUrl":"https://doi.org/10.3391/AI.2021.16.2.09","url":null,"abstract":"Aquatic plants (macrophytes) are important components of freshwater ecosystems and serve numerous functions, both physical and biological, that help to structure aquatic communities. However, invasive macrophytes may negatively alter ecosystem properties. Non-native invasive species have been identified as a major cause of biodiversity loss and the increasing prevalence of invasive species has prompted studies to help understand their impacts and to conserve biodiversity. Studying mechanisms of invasion also gives ecological insight into how communities are structured and assembled. This study examined a set of potential factors influencing invasion including biotic resistance, exposure, and water depth using mixed-effects models on macrophyte survey data collected from twenty-nine lakes across the United States. The results of this study indicated that biotic resistance measured from native species richness, exposure due to fetch, and water depth interact, often in non-linear ways to influence probability of invasive species occurrence at a given location; however, models explained a relatively low percentage of variation in probabilities. It is likely that strong predictive principles governing macrophyte invasions do not exist, at least among comparisons across a range of ecosystem types and environmental conditions. However, ecologists should continue to search for general patterns within definable ecosystem units to increase understanding about factors contributing to invasibility.","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"1 1","pages":"349-364"},"PeriodicalIF":1.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79920132","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}
Leonela Rosales-Catalán, Mariae C. Estrada-González, Crisalejandra Rivera-Perez, M. Sánchez, Edgar Gamero-Mora, A. Morandini, María A. Mendoza-Becerril
{"title":"Genetic and morphological evidence of the presence of Phyllorhiza punctata in the southwestern Gulf of California (NE Pacific Ocean)","authors":"Leonela Rosales-Catalán, Mariae C. Estrada-González, Crisalejandra Rivera-Perez, M. Sánchez, Edgar Gamero-Mora, A. Morandini, María A. Mendoza-Becerril","doi":"10.3391/ai.2021.16.4.04","DOIUrl":"https://doi.org/10.3391/ai.2021.16.4.04","url":null,"abstract":"","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"82 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80512463","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}
James Whitney, J. Holloway, Jake Wright, Kali L. Boroughs, Robin Goodreau, Ashton McManis, Adam Pistorius, Deaundre Puritty, Michael Ramirez, Rachel Styers
{"title":"Assessing the invasion history and contemporary diet of nonnative redear sunfish (Lepomis microlophus Günther, 1859) in an ecotonal riverscape","authors":"James Whitney, J. Holloway, Jake Wright, Kali L. Boroughs, Robin Goodreau, Ashton McManis, Adam Pistorius, Deaundre Puritty, Michael Ramirez, Rachel Styers","doi":"10.3391/ai.2021.16.3.09","DOIUrl":"https://doi.org/10.3391/ai.2021.16.3.09","url":null,"abstract":"","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"40 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80938185","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}
A. Dobrović, I. Maguire, M. Boban, Dorotea Grbin, Sandra Hudina
Despite the growing number of established populations in Europe, the reproduction dynamics of parthenogenetic marbled crayfish, Procambarus virginalis Lyko, 2017, from populations in the wild is currently understudied. In this study, we performed a systematic seven-month long monitoring of the reproduction dynamics of marbled crayfish population in an anthropogenic lake in continental Croatia. Crayfish were caught monthly by applying the baited stick catch method. We recorded pleopodal fecundity and the number of hatched juveniles in each monthly catch and a random selection of individuals (20 per month) was dissected to determine the ovarian fecundity. Obtained fecundity parameters were correlated with crayfish size (total length, weight and pleon size), body condition (Fulton’s condition factor), organosomatic indices (hepatosomatic index: HSI and gonadosomatic index: GSI) and compared with available literature data on marbled crayfish from laboratory-reared or wild populations. Based on the obtained data, we identified two potential reproductive peaks in early summer and mid autumn. However, the continuous presence of individuals with mature ovarian eggs and glair glands throughout almost the entire monitoring period indicates potential reproduction throughout June to November. Ovarian egg number and number of hatched juveniles was significantly correlated with crayfish size and Fulton’s condition factor, while GSI exhibited significant variations among analyzed months and was positively correlated with HSI. The number of hatched juveniles in our study was significantly lower compared to literature data for marbled crayfish from populations in the wild and laboratory-reared populations. Collected data offer insights into the understudied reproduction dynamics of marbled crayfish in the wild and represent baseline information for predicting its invasion dynamics and risks of its further spread in this region.
{"title":"Reproduction dynamics of the marbled crayfish Procambarus virginalis Lyko, 2017 from an anthropogenic lake in northern Croatia","authors":"A. Dobrović, I. Maguire, M. Boban, Dorotea Grbin, Sandra Hudina","doi":"10.3391/ai.2021.16.3.06","DOIUrl":"https://doi.org/10.3391/ai.2021.16.3.06","url":null,"abstract":"Despite the growing number of established populations in Europe, the reproduction dynamics of parthenogenetic marbled crayfish, Procambarus virginalis Lyko, 2017, from populations in the wild is currently understudied. In this study, we performed a systematic seven-month long monitoring of the reproduction dynamics of marbled crayfish population in an anthropogenic lake in continental Croatia. Crayfish were caught monthly by applying the baited stick catch method. We recorded pleopodal fecundity and the number of hatched juveniles in each monthly catch and a random selection of individuals (20 per month) was dissected to determine the ovarian fecundity. Obtained fecundity parameters were correlated with crayfish size (total length, weight and pleon size), body condition (Fulton’s condition factor), organosomatic indices (hepatosomatic index: HSI and gonadosomatic index: GSI) and compared with available literature data on marbled crayfish from laboratory-reared or wild populations. Based on the obtained data, we identified two potential reproductive peaks in early summer and mid autumn. However, the continuous presence of individuals with mature ovarian eggs and glair glands throughout almost the entire monitoring period indicates potential reproduction throughout June to November. Ovarian egg number and number of hatched juveniles was significantly correlated with crayfish size and Fulton’s condition factor, while GSI exhibited significant variations among analyzed months and was positively correlated with HSI. The number of hatched juveniles in our study was significantly lower compared to literature data for marbled crayfish from populations in the wild and laboratory-reared populations. Collected data offer insights into the understudied reproduction dynamics of marbled crayfish in the wild and represent baseline information for predicting its invasion dynamics and risks of its further spread in this region.","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"4 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85207645","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}
{"title":"Assessing biotic interactions between a non-indigenous amphipod and its congener in a future climate change scenario","authors":"P. Parretti","doi":"10.3391/ai.2021.16.2.01","DOIUrl":"https://doi.org/10.3391/ai.2021.16.2.01","url":null,"abstract":"","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"30 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84952345","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}
P. Schofield, Quenton M. Tuckett, D. Slone, Kristen M Reaver, Jeffrey E. Hill
Croaking gourami Trichopsis vittata is a non-native fish species that has maintained a reproducing population in Florida, USA, since at least the 1970s. However, unlike most other non-native fishes in Florida, T. vittata has not spread beyond its very small (ca. 5 km 2 ) range. We suspected the inability of T. vittata to colonize new habitats may be due to biotic resistance by the native eastern mosquitofish Gambusia holbrooki . In laboratory experiments, we show that G. holbrooki causes physical damage to T. vittata and that T. vittata ’s growth is reduced in the presence of G. holbrooki . While the effects of G. holbrooki on T. vittata were sub-lethal, they were severe enough to hamper its growth and could affect recruitment in the wild. These results support the hypothesis that small non-native fishes may be excluded from establishment or may only establish small ranges due to pressure from G. holbrooki . Biotic resistance may reduce invasion success and thus consideration of species interactions is useful for natural resource managers trying to evaluate the potential risk of new invaders.
{"title":"Invasion frustration: can biotic resistance explain the small geographic range of non-native croaking gourami Trichopsis vittata (Cuvier, 1831) in Florida, USA?","authors":"P. Schofield, Quenton M. Tuckett, D. Slone, Kristen M Reaver, Jeffrey E. Hill","doi":"10.3391/ai.2021.16.3.08","DOIUrl":"https://doi.org/10.3391/ai.2021.16.3.08","url":null,"abstract":"Croaking gourami Trichopsis vittata is a non-native fish species that has maintained a reproducing population in Florida, USA, since at least the 1970s. However, unlike most other non-native fishes in Florida, T. vittata has not spread beyond its very small (ca. 5 km 2 ) range. We suspected the inability of T. vittata to colonize new habitats may be due to biotic resistance by the native eastern mosquitofish Gambusia holbrooki . In laboratory experiments, we show that G. holbrooki causes physical damage to T. vittata and that T. vittata ’s growth is reduced in the presence of G. holbrooki . While the effects of G. holbrooki on T. vittata were sub-lethal, they were severe enough to hamper its growth and could affect recruitment in the wild. These results support the hypothesis that small non-native fishes may be excluded from establishment or may only establish small ranges due to pressure from G. holbrooki . Biotic resistance may reduce invasion success and thus consideration of species interactions is useful for natural resource managers trying to evaluate the potential risk of new invaders.","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"52 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85754983","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}
Sponges are normally considered as living hotels and they have been the most common basebionts (45.5%) for the non-indigenous species Ophiothela mirabilis Verrill, 1867 in the Brazilian coast. This ophiuroid is native to the Pacific Ocean but is spreading out in the Tropical Western Atlantic since 2000. Regarding this invasion, quantitative data is necessary to understand O. mirabilis threat. The aim of this study was to quantify the abundance of O. mirabilis on marine sponges along the Brazilian coast, and to evaluate the relationship of the non-indigenous species with sponge phenotypes, to test the hypothesis that this non-indigenous species prefers erect, irregular and yellowish sponges to facilitate attachment and camouflage. Epibiosis of O. mirabilis on sponges were photographed in 27 sites from Maranhão to Rio de Janeiro States, Brazil, and the abundance of sponges and ophiuroids on each sponge individual was counted. Only Bahia and Rio de Janeiro States presented an association, which was positively correlated (R2 = 0.85, F = 36.16, p < 0.001) between sponges and ophiuroid mean abundances. No morphological trait was statistically chosen by O. mirabilis, but the null probabilistic model indicates Mycale (Zygomycale) angulosa (Duchassaing & Michelotti, 1864) may be a preferred sponge basebiont. This first large-scale quantitative study indicates O. mirabilis may become a dangerous invader due to weak host preferences and efficient asexual reproduction strategy. This work can be used as a baseline template for monitoring and eradication programs, especially in Brazilian bays of high diversity and with human impact.
{"title":"Quantification of the non-indigenous ophiuroid Ophiothela mirabilis Verrill, 1867 associated with marine sponges with different morphologies","authors":"Humberto F. M. Fortunato, G. Lôbo‐Hajdu","doi":"10.3391/AI.2021.16.1.06","DOIUrl":"https://doi.org/10.3391/AI.2021.16.1.06","url":null,"abstract":"Sponges are normally considered as living hotels and they have been the most common basebionts (45.5%) for the non-indigenous species Ophiothela mirabilis Verrill, 1867 in the Brazilian coast. This ophiuroid is native to the Pacific Ocean but is spreading out in the Tropical Western Atlantic since 2000. Regarding this invasion, quantitative data is necessary to understand O. mirabilis threat. The aim of this study was to quantify the abundance of O. mirabilis on marine sponges along the Brazilian coast, and to evaluate the relationship of the non-indigenous species with sponge phenotypes, to test the hypothesis that this non-indigenous species prefers erect, irregular and yellowish sponges to facilitate attachment and camouflage. Epibiosis of O. mirabilis on sponges were photographed in 27 sites from Maranhão to Rio de Janeiro States, Brazil, and the abundance of sponges and ophiuroids on each sponge individual was counted. Only Bahia and Rio de Janeiro States presented an association, which was positively correlated (R2 = 0.85, F = 36.16, p < 0.001) between sponges and ophiuroid mean abundances. No morphological trait was statistically chosen by O. mirabilis, but the null probabilistic model indicates Mycale (Zygomycale) angulosa (Duchassaing & Michelotti, 1864) may be a preferred sponge basebiont. This first large-scale quantitative study indicates O. mirabilis may become a dangerous invader due to weak host preferences and efficient asexual reproduction strategy. This work can be used as a baseline template for monitoring and eradication programs, especially in Brazilian bays of high diversity and with human impact.","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"37 1","pages":"77-93"},"PeriodicalIF":1.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82089954","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}
P. Woodruff, B. Poorten, C. Walters, V. Christensen
Dreissenid (zebra and quagga) mussels are spreading across North America and having an impact on freshwater ecosystems, through bottom-up impacts. Lakes in British Columbia are known to be at risk for mussel invasion due to favourable water chemistry and significant cross-border boat movements. This project uses Ecopath with Ecosim (EwE) to model a hypothetical mussel invasion into Shuswap Lake: one of the most popular lakes for recreation and one of the most productive sockeye lakes in the province. A model of the ecosystem was fit to available data and then projected forward to examine the effects from three different scenarios: no invasion, a base mussel invasion scenario resulting in a carrying capacity of 5 g∙m and 15 g∙m of zebra and quagga mussels, respectively, and a high density invasion scenario resulting in a combined carrying capacity of 40 g∙m of Dreissenid mussels. The greatest ecosystem impacts resulted in declines in large piscivorous rainbow trout and lake trout, followed by non-anadromous kokanee salmon, with little effect observed on anadromous sockeye salmon. Two mechanisms limit the predicted impact of mussels in the study system: (1) paucity of shallow water habitat, limiting the scope for invasion; and (2) movements by fish in and out of the system. This second mechanism includes some resident species that rear for up to three years upstream of the lake, as well as anadromous species, which spend most of their life in the marine environment. While most of the effects are observed on recreationally important species, there is also the possibility of mussels spreading from this system into others within the same watershed, reiterating the importance of preventing the invasion and spread of Dreissenid mussels.
斑马和斑驴贻贝正在北美蔓延，并通过自下而上的影响对淡水生态系统产生影响。由于有利的水化学和重大的跨境船只运动，不列颠哥伦比亚省的湖泊面临贻贝入侵的风险。该项目使用Ecopath with Ecosim (EwE)来模拟贻贝入侵舒斯瓦普湖的假设:舒斯瓦普湖是该省最受欢迎的休闲湖泊之一，也是最具生产力的红眼鱼湖之一。将生态系统模型拟合现有数据，然后进行预测，以检验三种不同情景的影响:没有入侵，基本贻贝入侵情景导致斑马贻贝和斑驴贻贝的承载能力分别为5 g∙m和15 g∙m，高密度入侵情景导致德莱森尼贻贝的总承载能力为40 g∙m。对生态系统影响最大的是大型食鱼虹鳟鱼和湖鳟鱼的数量下降，其次是非溯河鲑鱼，对溯河红鲑的影响很小。两种机制限制了贻贝在研究系统中的预测影响:(1)浅水栖息地缺乏，限制了贻贝的入侵范围;(2)鱼类进出系统的运动。第二种机制包括一些在湖上游生活长达三年的常驻物种，以及在海洋环境中度过大部分生命的溯河物种。虽然观察到的大多数影响是对娱乐重要物种的影响，但也有可能贻贝从这个系统扩散到同一流域内的其他物种，这重申了防止德雷塞尼贻贝入侵和扩散的重要性。
{"title":"Potential effects of invasive Dreissenid mussels on a pelagic freshwater ecosystem: using an ecosystem model to simulate mussel invasion in a sockeye lake","authors":"P. Woodruff, B. Poorten, C. Walters, V. Christensen","doi":"10.3391/AI.2021.16.1.09","DOIUrl":"https://doi.org/10.3391/AI.2021.16.1.09","url":null,"abstract":"Dreissenid (zebra and quagga) mussels are spreading across North America and having an impact on freshwater ecosystems, through bottom-up impacts. Lakes in British Columbia are known to be at risk for mussel invasion due to favourable water chemistry and significant cross-border boat movements. This project uses Ecopath with Ecosim (EwE) to model a hypothetical mussel invasion into Shuswap Lake: one of the most popular lakes for recreation and one of the most productive sockeye lakes in the province. A model of the ecosystem was fit to available data and then projected forward to examine the effects from three different scenarios: no invasion, a base mussel invasion scenario resulting in a carrying capacity of 5 g∙m and 15 g∙m of zebra and quagga mussels, respectively, and a high density invasion scenario resulting in a combined carrying capacity of 40 g∙m of Dreissenid mussels. The greatest ecosystem impacts resulted in declines in large piscivorous rainbow trout and lake trout, followed by non-anadromous kokanee salmon, with little effect observed on anadromous sockeye salmon. Two mechanisms limit the predicted impact of mussels in the study system: (1) paucity of shallow water habitat, limiting the scope for invasion; and (2) movements by fish in and out of the system. This second mechanism includes some resident species that rear for up to three years upstream of the lake, as well as anadromous species, which spend most of their life in the marine environment. While most of the effects are observed on recreationally important species, there is also the possibility of mussels spreading from this system into others within the same watershed, reiterating the importance of preventing the invasion and spread of Dreissenid mussels.","PeriodicalId":8119,"journal":{"name":"Aquatic Invasions","volume":"108 1","pages":"129-146"},"PeriodicalIF":1.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86972444","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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