Pub Date : 2022-01-01DOI: 10.3391/mbi.2022.13.4.13
C. Villanueva, G. Prado, W. Gould, Carlos G. García-Quijano, J. Kolbe
Agricultural communities and crop production are negatively impacted by invasive species, with the effects of pathogenic fungi, parasitic insects and weedy plants being well studied. Mammals and birds are also recognized as impacting crops, but reptiles, such as non-native green iguanas ( Iguana iguana ), are typically not considered agricultural pests. Research on non-native green iguanas has largely focused on the lizard’s interactions with native species with little attention given to its impact in the agricultural landscape. We conducted semi-structured interviews with farmers from 20 farms in Puerto Rico to explore the effect of the invasive green iguana on the production of crops and how farmers manage impacts, if any. A total of 34 of 55 crop species reported by farmers were negatively affected by the green iguana. We found that green iguanas were absent from 20% of farms, did not consume crops in 10% of the farms and caused negative impacts in 70% of the remaining farms. Negative impacts included crop loss and infrastructural damage, which had behavioral, emotional, and economic effects on farmers. Specific outcomes of these effects were revenue loss, refurbishing costs, changes in crop selection, management costs and emotional stress. Farmers considered management strategies as mitigation measures that needed to be constant to produce any positive effects on crop yield. They reported use of mesh fencing, hunting, and domestic animals as attempts to reduce negative effects of green iguanas on crop production. Recognition of this species as an agricultural pest is warranted in Puerto Rico and perhaps elsewhere in its introduced range. Agricultural extension agents should consider providing guidance on strategies to reduce negative impacts of green iguanas including cultivating less susceptible crops when possible.
{"title":"Interviews with farmers suggest negative direct and indirect effects of the invasive green iguana (Iguana iguana) on agriculture in Puerto Rico","authors":"C. Villanueva, G. Prado, W. Gould, Carlos G. García-Quijano, J. Kolbe","doi":"10.3391/mbi.2022.13.4.13","DOIUrl":"https://doi.org/10.3391/mbi.2022.13.4.13","url":null,"abstract":"Agricultural communities and crop production are negatively impacted by invasive species, with the effects of pathogenic fungi, parasitic insects and weedy plants being well studied. Mammals and birds are also recognized as impacting crops, but reptiles, such as non-native green iguanas ( Iguana iguana ), are typically not considered agricultural pests. Research on non-native green iguanas has largely focused on the lizard’s interactions with native species with little attention given to its impact in the agricultural landscape. We conducted semi-structured interviews with farmers from 20 farms in Puerto Rico to explore the effect of the invasive green iguana on the production of crops and how farmers manage impacts, if any. A total of 34 of 55 crop species reported by farmers were negatively affected by the green iguana. We found that green iguanas were absent from 20% of farms, did not consume crops in 10% of the farms and caused negative impacts in 70% of the remaining farms. Negative impacts included crop loss and infrastructural damage, which had behavioral, emotional, and economic effects on farmers. Specific outcomes of these effects were revenue loss, refurbishing costs, changes in crop selection, management costs and emotional stress. Farmers considered management strategies as mitigation measures that needed to be constant to produce any positive effects on crop yield. They reported use of mesh fencing, hunting, and domestic animals as attempts to reduce negative effects of green iguanas on crop production. Recognition of this species as an agricultural pest is warranted in Puerto Rico and perhaps elsewhere in its introduced range. Agricultural extension agents should consider providing guidance on strategies to reduce negative impacts of green iguanas including cultivating less susceptible crops when possible.","PeriodicalId":54262,"journal":{"name":"Management of Biological Invasions","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69555722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2022-01-01DOI: 10.3391/mbi.2022.13.1.13
A. Riesgraf, J. Finger, Daniel Zielinski, Clark Dennis III, J. Whitty, Peter Sorensen
There is an urgent need to block the passage of carp and other invasive fishes through navigational locks in large rivers. Although the broadband sound of an outboard motor has been shown to strongly repel three species of carp in laboratory flumes and to a lesser extent inside of a lock chamber, it has not yet been tested to determineif it can stop carp from entering a lock. To test this possibility, we attached speakers to lock gates and played the sound of an outboard motor while measuring its efficacy by tracking free-ranging transplanted tagged common carp in its vicinity. Eight groups of 20 carp were tested while the sound system was turned on and off for 2 week periods. When the sound system was on, these carp spent approximately one-third less time in front of the lock gates than when it was off; however, when analyzed by a GLMM this effect was shown to be no greater than the effects of river discharge or temperature. Additionally, lock entrance rates were lower, albeit non-significantly, when the sound was off. A number of factors may have contributed to the limited efficacy of this deterrent system including the sound itself.
{"title":"Evaluation of a broadband sound projected from the gates of a navigation lock in the Mississippi River shows it to be a weak deterrent for common carp and unable to block passage","authors":"A. Riesgraf, J. Finger, Daniel Zielinski, Clark Dennis III, J. Whitty, Peter Sorensen","doi":"10.3391/mbi.2022.13.1.13","DOIUrl":"https://doi.org/10.3391/mbi.2022.13.1.13","url":null,"abstract":"There is an urgent need to block the passage of carp and other invasive fishes through navigational locks in large rivers. Although the broadband sound of an outboard motor has been shown to strongly repel three species of carp in laboratory flumes and to a lesser extent inside of a lock chamber, it has not yet been tested to determineif it can stop carp from entering a lock. To test this possibility, we attached speakers to lock gates and played the sound of an outboard motor while measuring its efficacy by tracking free-ranging transplanted tagged common carp in its vicinity. Eight groups of 20 carp were tested while the sound system was turned on and off for 2 week periods. When the sound system was on, these carp spent approximately one-third less time in front of the lock gates than when it was off; however, when analyzed by a GLMM this effect was shown to be no greater than the effects of river discharge or temperature. Additionally, lock entrance rates were lower, albeit non-significantly, when the sound was off. A number of factors may have contributed to the limited efficacy of this deterrent system including the sound itself.","PeriodicalId":54262,"journal":{"name":"Management of Biological Invasions","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69554985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2022-01-01DOI: 10.3391/mbi.2022.13.1.02
T. Osawa
The pragmatic management of invasive alien species should integrate two essential items: 1) management interventions and 2) a spatially explicit management plan. Predicting the future expansion of target species in a region at the early invasion stage is an important step toward the establishment of a spatially explicit management plan. However, information regarding the distributions of target species is limited, making it challenging to predict range expansions. In the present study, we established a simulation model that could predict the future expansion of the invasive insect Aromia bungii, which is harmful to Prunus trees (including cherry trees [Cerasus × yedoensis]), in Japan. We employed a virtual ecology approach that simulated species dynamics based on a simple model in Saitama Prefecture, which is in the Kanto region of Japan. Since the first record of the species in this region of Japan in 2013, its range has expanded dramatically. Three candidate pathways and combinations of these for the range expansion of A. bungii were tested to identify the major proxies of expansion for this species, followed by the validation of these results using occurrence records for the species through 2019. Both the river density model and combined river and road density models showed good predictive performance. Using these models, we established a predictive map of the future expansion of this species in the wider range of the simulation area. Based on the results, we recommend concentration of management efforts in the mid-northeast region of the Saitama Prefecture.
外来入侵物种的务实管理应包括两个基本要素:1)管理干预;2)空间明确的管理计划。在入侵早期预测目标物种在一个地区的未来扩张是建立空间明确管理计划的重要一步。然而，关于目标物种分布的信息有限，使得预测范围扩展具有挑战性。在本研究中，我们建立了一个模拟模型，可以预测对日本李树(包括樱桃树[Cerasus x yedoensis])有害的入侵昆虫bungii的未来扩展。在日本关东地区的埼玉县，我们采用了一种基于简单模型的虚拟生态学方法来模拟物种动态。自2013年在日本这一地区首次记录到该物种以来，其活动范围急剧扩大。本研究测试了布氏单胞杆菌范围扩展的三种候选途径及其组合，以确定该物种扩展的主要代用物，然后使用该物种到2019年的发生记录对这些结果进行验证。河流密度模型和河路混合密度模型均具有较好的预测效果。利用这些模型，我们在模拟区域的更大范围内建立了该物种未来扩张的预测图。根据研究结果，我们建议将管理工作集中在埼玉县东北中部地区。
{"title":"Establishment of an expansion-predicting model for invasive alien cerambycid beetle Aromia bungii based on a virtual ecology approach","authors":"T. Osawa","doi":"10.3391/mbi.2022.13.1.02","DOIUrl":"https://doi.org/10.3391/mbi.2022.13.1.02","url":null,"abstract":"The pragmatic management of invasive alien species should integrate two essential items: 1) management interventions and 2) a spatially explicit management plan. Predicting the future expansion of target species in a region at the early invasion stage is an important step toward the establishment of a spatially explicit management plan. However, information regarding the distributions of target species is limited, making it challenging to predict range expansions. In the present study, we established a simulation model that could predict the future expansion of the invasive insect Aromia bungii, which is harmful to Prunus trees (including cherry trees [Cerasus × yedoensis]), in Japan. We employed a virtual ecology approach that simulated species dynamics based on a simple model in Saitama Prefecture, which is in the Kanto region of Japan. Since the first record of the species in this region of Japan in 2013, its range has expanded dramatically. Three candidate pathways and combinations of these for the range expansion of A. bungii were tested to identify the major proxies of expansion for this species, followed by the validation of these results using occurrence records for the species through 2019. Both the river density model and combined river and road density models showed good predictive performance. Using these models, we established a predictive map of the future expansion of this species in the wider range of the simulation area. Based on the results, we recommend concentration of management efforts in the mid-northeast region of the Saitama Prefecture.","PeriodicalId":54262,"journal":{"name":"Management of Biological Invasions","volume":"75 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69555365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2022-01-01DOI: 10.3391/mbi.2022.13.4.05
M. Winder, A. Sepulveda, A. Hoegh
Early detection of dreissenid mussels ( Dreissena polymorpha and D. rostriformis bugensis ) is crucial to mitigating the economic and environmental impacts of an infestation. Plankton tow sampling is a common method used for early detection of dreissenid mussels, but little is known about the sampling intensity required for a high probability of early detection using the method. We used implicit dynamic occupancy models to estimate plankton tow detection probabilities of dreissenid mussels from a long-term data set containing plankton tow samples collected across central and western United States. We fit models using a) the entire data set, including water bodies with unknown occupancy status in addition to heavily infested water bodies, b) a data subset that included water bodies with paired water temperature data, and c) a data subset that included water bodies with lower dreissenid densities. For the entire data set, we found that estimated detection probabilities varied by water body size and ranged from approximately 0.10 to 0.86. For the water temperature subset, we observed the same pattern between detection probability and water body size as we did for the full data but additionally found that the estimated detection probabilities were much higher when water temperatures were above 12 °C. For the lower dreissenid density subset, we found that the estimated probability of detecting dreissenid mussels with a single aggregated plankton tow sample was near zero. Given these estimates, we conclude that the number of aggregated plankton tow samples taken per water body in the data is far fewer than the number needed to ensure a high probability of detecting dreissenid mussels, especially if they are at low densities. We summarize the analyses with a discussion of plankton tow sampling protocol changes needed to improve estimates of dreissenid detection probabilities.
{"title":"An initial assessment of plankton tow detection probabilities for dreissenid mussels in the western United States","authors":"M. Winder, A. Sepulveda, A. Hoegh","doi":"10.3391/mbi.2022.13.4.05","DOIUrl":"https://doi.org/10.3391/mbi.2022.13.4.05","url":null,"abstract":"Early detection of dreissenid mussels ( Dreissena polymorpha and D. rostriformis bugensis ) is crucial to mitigating the economic and environmental impacts of an infestation. Plankton tow sampling is a common method used for early detection of dreissenid mussels, but little is known about the sampling intensity required for a high probability of early detection using the method. We used implicit dynamic occupancy models to estimate plankton tow detection probabilities of dreissenid mussels from a long-term data set containing plankton tow samples collected across central and western United States. We fit models using a) the entire data set, including water bodies with unknown occupancy status in addition to heavily infested water bodies, b) a data subset that included water bodies with paired water temperature data, and c) a data subset that included water bodies with lower dreissenid densities. For the entire data set, we found that estimated detection probabilities varied by water body size and ranged from approximately 0.10 to 0.86. For the water temperature subset, we observed the same pattern between detection probability and water body size as we did for the full data but additionally found that the estimated detection probabilities were much higher when water temperatures were above 12 °C. For the lower dreissenid density subset, we found that the estimated probability of detecting dreissenid mussels with a single aggregated plankton tow sample was near zero. Given these estimates, we conclude that the number of aggregated plankton tow samples taken per water body in the data is far fewer than the number needed to ensure a high probability of detecting dreissenid mussels, especially if they are at low densities. We summarize the analyses with a discussion of plankton tow sampling protocol changes needed to improve estimates of dreissenid detection probabilities.","PeriodicalId":54262,"journal":{"name":"Management of Biological Invasions","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69555665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2022-01-01DOI: 10.3391/mbi.2022.13.4.08
O. Rafikova, D. Veselkin
This study was undertaken to test the hypothesis about the allelopathic activity of the alien (invasive) tree species Acer negundo in Eurasia compare with native tree species. Research of allelopathic effects of invasive plants is important for its management because of their influence on native communities. Two experiments in Petri dishes were conducted. The effect of water extracts from leaves on the seed germination of herbaceous plants was assessed. Leaves were collected in the summer and autumn season in areas invaded by A. negundo in Yekaterinburg, Russian Federation. Four treatments (invasive A. negundo and native tree species Sorbus aucuparia , Prunus padus , and Salix caprea ) were tested on seeds of three recipient plant species ( Festuca rubra , Sinapis alba , and Trifolium repens ). We found that water extracts from A. negundo leaves weakly inhibit seed germination compared to distilled water. However, the inhibitory effect of A. negundo was no greater than effects of extracts from leaves of native P. padus and S. caprea . Seed germination was most strongly inhibited with extracts from a native shrub S. aucuparia , and the delay in comparison with distilled water was 1–2 days. Therefore, in Petri dishes water extracts from leaves of A. negundo do not inhibit seed germination of test plants more than native tree species. Our data do not support a hypothesis that allelopathy can explain the ability of A. negundo to influence native communities.
{"title":"Leaf water extracts from invasive Acer negundo do not inhibit seed germination more than leaf extracts from native species","authors":"O. Rafikova, D. Veselkin","doi":"10.3391/mbi.2022.13.4.08","DOIUrl":"https://doi.org/10.3391/mbi.2022.13.4.08","url":null,"abstract":"This study was undertaken to test the hypothesis about the allelopathic activity of the alien (invasive) tree species Acer negundo in Eurasia compare with native tree species. Research of allelopathic effects of invasive plants is important for its management because of their influence on native communities. Two experiments in Petri dishes were conducted. The effect of water extracts from leaves on the seed germination of herbaceous plants was assessed. Leaves were collected in the summer and autumn season in areas invaded by A. negundo in Yekaterinburg, Russian Federation. Four treatments (invasive A. negundo and native tree species Sorbus aucuparia , Prunus padus , and Salix caprea ) were tested on seeds of three recipient plant species ( Festuca rubra , Sinapis alba , and Trifolium repens ). We found that water extracts from A. negundo leaves weakly inhibit seed germination compared to distilled water. However, the inhibitory effect of A. negundo was no greater than effects of extracts from leaves of native P. padus and S. caprea . Seed germination was most strongly inhibited with extracts from a native shrub S. aucuparia , and the delay in comparison with distilled water was 1–2 days. Therefore, in Petri dishes water extracts from leaves of A. negundo do not inhibit seed germination of test plants more than native tree species. Our data do not support a hypothesis that allelopathy can explain the ability of A. negundo to influence native communities.","PeriodicalId":54262,"journal":{"name":"Management of Biological Invasions","volume":"39 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69555670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2022-01-01DOI: 10.3391/mbi.2022.13.4.10
P. Kroboth, D. Chapman, J. Steevens, Curtis D. Byrd
Toxic baits are a potential control mechanism for nuisance carps, but rotenone-based baits for grass carp Ctenopharyngodon idella have been ineffective. Failures have been attributed to the palatability of rotenone because innocuous training pellets are readily consumed prior to provision of piscicide baits. Several studies suggest antimycin A, a common alternative piscicide, typically applied directly to water, may be suitable as an ingested bait. The oral toxicity of antimycin A is not well described. We evaluated the oral toxicity of antimycin A in two carriers (ethanol and corn oil) on grass carp and black carp Mylopharyngodon piceus, administered via gavage. Doses ranged from 1–16 mg/kg. Lethal dose estimates for 50% of treated fish (LD50) were calculated, and the observed treatment levels resulting in complete mortality are reported at 24- and 96-hours post-treatment. Ethanol was a more effective carrier than corn oil with lower LD50 estimates and observed treatment levels with complete mortality. Antimycin A in corn oil produced only partial mortality of black carp even 96 hours from treatment and at the highest dose administered. Results document ingested doses required for mortality of grass carp and black carp that may be used for future development of species-selective antimycin A baits.
{"title":"Ingested toxicity of antimycin A to grass carp Ctenopharyngodon idella and black carp Mylopharyngodon piceus in two carriers","authors":"P. Kroboth, D. Chapman, J. Steevens, Curtis D. Byrd","doi":"10.3391/mbi.2022.13.4.10","DOIUrl":"https://doi.org/10.3391/mbi.2022.13.4.10","url":null,"abstract":"Toxic baits are a potential control mechanism for nuisance carps, but rotenone-based baits for grass carp Ctenopharyngodon idella have been ineffective. Failures have been attributed to the palatability of rotenone because innocuous training pellets are readily consumed prior to provision of piscicide baits. Several studies suggest antimycin A, a common alternative piscicide, typically applied directly to water, may be suitable as an ingested bait. The oral toxicity of antimycin A is not well described. We evaluated the oral toxicity of antimycin A in two carriers (ethanol and corn oil) on grass carp and black carp Mylopharyngodon piceus, administered via gavage. Doses ranged from 1–16 mg/kg. Lethal dose estimates for 50% of treated fish (LD50) were calculated, and the observed treatment levels resulting in complete mortality are reported at 24- and 96-hours post-treatment. Ethanol was a more effective carrier than corn oil with lower LD50 estimates and observed treatment levels with complete mortality. Antimycin A in corn oil produced only partial mortality of black carp even 96 hours from treatment and at the highest dose administered. Results document ingested doses required for mortality of grass carp and black carp that may be used for future development of species-selective antimycin A baits.","PeriodicalId":54262,"journal":{"name":"Management of Biological Invasions","volume":"48 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69555684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2022-01-01DOI: 10.3391/mbi.2022.13.1.15
Wing-Him Lee, J. Fong, Wing‐Ho Lee, Yik‐Hei Sung
The Chinese bullfrog, Hoplobatrachus rugulosus (Wiegmann, 1834), naturally distributed in Thailand, Laos, Vietnam and China, is commonly used in the religious practice of mercy release. The release of H. rugulosus is complicated by the fact that it likely represents a cryptic species complex (multiple species under a single name). In Hong Kong, although there are native and released individuals, the impact of release has not been investigated. In this study, we conduct genetic and morphological analyses of H. rugulosus across Hong Kong to determine the source (native or released) of frogs, the distribution of released populations and identify morphological characteristics that can be used to differentiate native and released individuals. We found that H. rugulosus individuals in Hong Kong belong to the two major genetic clades identified in previous studies (Clade A and Clade B). We consider individuals in Clade A as released frogs based on the genetic result that cluster these individuals with wild H. rugulosus from western, central and eastern Thailand, and individuals from Chinese frog farms. Individuals from the two genetic clades differ based on morphology (dorsal color, coloration of loreal region, presence of wounds and coloration on lateral sides), that can be useful for identification. However, there are four individuals in Clade A that are morphologically similar to native frogs, raising the possibility of hybridization between individuals in the two clades. We strongly recommend that the mercy release of H. rugulosus and other exotic animals should be strictly prohibited by law in Hong Kong and other parts of the world. Eradication guidelines should be developed by experts, as a references for governments, conservation groups and the public.
{"title":"Mercy or messy: distribution and differentiation of native and released Chinese bullfrogs (Hoplobatrachus rugulosus) in Hong Kong using genetic and morphological analyses","authors":"Wing-Him Lee, J. Fong, Wing‐Ho Lee, Yik‐Hei Sung","doi":"10.3391/mbi.2022.13.1.15","DOIUrl":"https://doi.org/10.3391/mbi.2022.13.1.15","url":null,"abstract":"The Chinese bullfrog, Hoplobatrachus rugulosus (Wiegmann, 1834), naturally distributed in Thailand, Laos, Vietnam and China, is commonly used in the religious practice of mercy release. The release of H. rugulosus is complicated by the fact that it likely represents a cryptic species complex (multiple species under a single name). In Hong Kong, although there are native and released individuals, the impact of release has not been investigated. In this study, we conduct genetic and morphological analyses of H. rugulosus across Hong Kong to determine the source (native or released) of frogs, the distribution of released populations and identify morphological characteristics that can be used to differentiate native and released individuals. We found that H. rugulosus individuals in Hong Kong belong to the two major genetic clades identified in previous studies (Clade A and Clade B). We consider individuals in Clade A as released frogs based on the genetic result that cluster these individuals with wild H. rugulosus from western, central and eastern Thailand, and individuals from Chinese frog farms. Individuals from the two genetic clades differ based on morphology (dorsal color, coloration of loreal region, presence of wounds and coloration on lateral sides), that can be useful for identification. However, there are four individuals in Clade A that are morphologically similar to native frogs, raising the possibility of hybridization between individuals in the two clades. We strongly recommend that the mercy release of H. rugulosus and other exotic animals should be strictly prohibited by law in Hong Kong and other parts of the world. Eradication guidelines should be developed by experts, as a references for governments, conservation groups and the public.","PeriodicalId":54262,"journal":{"name":"Management of Biological Invasions","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69554991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2022-01-01DOI: 10.3391/mbi.2022.13.2.03
Kate Crane, Ross N. Cuthbert, N. Coughlan, L. Kregting, N. Reid, A. Ricciardi, H. MacIsaac, J. Dick
Invasive, submerged macrophytes negatively alter aquatic ecosystems and biodiversity through disruption of ecological structure and functioning. These plants are especially challenging and costly to control, with relatively few successful eradications. We examine the efficacy of dye treatments to control three invasive, submerged macrophyte species: Elodea canadensis Michx., Elodea nuttallii (Planchon) H. St. John and Lagarosiphon major (Ridley). Using an experimental mesocosm approach, growth rates of each species were monitored in relation to five light treatment groups: light, 1×, 2×, 3× dye dosage, and complete darkness (range: 2 70 to 0 μmol·m -2 ·s -1 ). Dye presence did not negate growth in any of the tested species, but the effects of treatments on invasive macrophyte growth rates differed across species. In dyed conditions, E. canadensis exhibited significantly greater increases in length compared to E. nuttallii and L. major , whilst E. nuttallii and L. major were lower and statistically similar. However, L. major significantly increased length relative to Elodea spp. in dark conditions. Similarly, for biomass changes, Elodea spp. gained significantly more biomass than L. major under light and dyed conditions, but not in the dark. Our findings suggest that the tested dye concentrations are not sufficient to halt the growth of these plants. However, under certain conditions, they could potentially help to reduce densities of invasive macrophytes by slowing growth rates and reducing biomass in select species. Differential responses to light could also help explain species replacement dynamics under varying environmental contexts. Overall, while further empirical research is required, management actions that reduce light could help control aquatic macrophytes in combination with other actions, but could also simultaneously mediate shifts in community assembly.
入侵的沉水植物通过破坏生态结构和功能，对水生生态系统和生物多样性产生负面影响。这些植物尤其具有挑战性，控制起来成本高昂，成功根除的案例相对较少。我们研究了染料处理对三种入侵的淹没植物的控制效果:加拿大绿叶藻。， Elodea nuttallii (Planchon) H. St. John和Lagarosiphon major (Ridley)。采用实验中观法，对5个光照处理组(光照、1x、2x、3x染料剂量和完全黑暗(范围:270 ~ 0 μmol·m -2·s -1)下各种属的生长速率进行了监测。染料的存在并没有抑制任何一种被试植物的生长，但处理对入侵性大型植物生长速率的影响在不同物种之间存在差异。在染色条件下，E. canadensis比E. nuttallii和L. major表现出更大的长度增长，而E. nuttallii和L. major则较低，统计学上相似。然而，在黑暗条件下，L. major相对于Elodea的长度显著增加。同样，对于生物量变化，Elodea sp .在光照和染色条件下获得的生物量显著高于L. major，而在黑暗条件下则没有。我们的研究结果表明，所测试的染料浓度不足以阻止这些植物的生长。然而，在某些条件下，它们可能通过减缓生长速度和减少某些物种的生物量来帮助降低入侵植物的密度。对光的不同反应也有助于解释不同环境下物种更替的动态。总体而言，虽然需要进一步的实证研究，但减少光照的管理行动可以帮助控制水生大型植物与其他行动相结合，但也可以同时调节群落聚集的变化。
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Pub Date : 2022-01-01DOI: 10.3391/mbi.2022.13.1.12
P. Bajer, Peter J. Hundt, Emil Kukulski, Matthew J. Kocian
Non-physical deterrence and guidance technologies are sought after for management of invasive fish, but they have rarely been tested in the field during natural fish migrations. We tested the efficacy of a semi-portable deterrence and guidance system (DGS) that used vertical electrodes producing low-voltage electric field to deter the upstream spawning migration of common carp (Cyprinus carpio Linnaeus, 1758) and direct them into a trap (5 m by 25 m enclosure with a net) in a natural stream. The behavior of carp was monitored using Passive Integrated Transponder (PIT) tags and antennas. The migration began on 7 April 2019, when water temperature was 5 °C and lasted through May 2019. Performance of the DGS was evaluated during three separate periods, between which the DGS was briefly deactivated. During the first period (4/7–4/19), 559 unique carp challenged the DGS. Of those, 10 were able to cross the DGS (98.2% efficacy), 234 (41.8%) were directed into the trap and 54 were captured. The mean number of days each carp was detected at the DGS was 2.6. During the second period (4/25–5/7), 562 unique PIT carp challenged the DGS. Of those, 24 were able to cross it (95.8% efficacy), 241 (42.9%) were directed into the trap and 148 were captured. Mean time at the DGS was 5.6 days. During the third period (5/7–5/15), 147 PIT carp challenged the DGS and 2 were able to cross it (98.6% efficiency). The mean time at the DGS was 5.5 days. Due to decreasing numbers of carp during the third period, we did not attempt to direct them into the trap for removal. Stream discharge during our test exceeded the 11-year average by 2–3 times; the floodplain was periodically flooded, and it is possible that some carp migrated around the DGS rather than through it. Overall, our results suggest that DGS that generate mild, electric field can be useful in deterring seasonal migrations of common carp and facilitating new removal strategies. The semi-portable nature of the system and low site-engineering requirements allow for rapid deployments and targeted applications during seasonal migrations.
{"title":"Field test of an electric deterrence and guidance system during a natural spawning migration of invasive common carp","authors":"P. Bajer, Peter J. Hundt, Emil Kukulski, Matthew J. Kocian","doi":"10.3391/mbi.2022.13.1.12","DOIUrl":"https://doi.org/10.3391/mbi.2022.13.1.12","url":null,"abstract":"Non-physical deterrence and guidance technologies are sought after for management of invasive fish, but they have rarely been tested in the field during natural fish migrations. We tested the efficacy of a semi-portable deterrence and guidance system (DGS) that used vertical electrodes producing low-voltage electric field to deter the upstream spawning migration of common carp (Cyprinus carpio Linnaeus, 1758) and direct them into a trap (5 m by 25 m enclosure with a net) in a natural stream. The behavior of carp was monitored using Passive Integrated Transponder (PIT) tags and antennas. The migration began on 7 April 2019, when water temperature was 5 °C and lasted through May 2019. Performance of the DGS was evaluated during three separate periods, between which the DGS was briefly deactivated. During the first period (4/7–4/19), 559 unique carp challenged the DGS. Of those, 10 were able to cross the DGS (98.2% efficacy), 234 (41.8%) were directed into the trap and 54 were captured. The mean number of days each carp was detected at the DGS was 2.6. During the second period (4/25–5/7), 562 unique PIT carp challenged the DGS. Of those, 24 were able to cross it (95.8% efficacy), 241 (42.9%) were directed into the trap and 148 were captured. Mean time at the DGS was 5.6 days. During the third period (5/7–5/15), 147 PIT carp challenged the DGS and 2 were able to cross it (98.6% efficiency). The mean time at the DGS was 5.5 days. Due to decreasing numbers of carp during the third period, we did not attempt to direct them into the trap for removal. Stream discharge during our test exceeded the 11-year average by 2–3 times; the floodplain was periodically flooded, and it is possible that some carp migrated around the DGS rather than through it. Overall, our results suggest that DGS that generate mild, electric field can be useful in deterring seasonal migrations of common carp and facilitating new removal strategies. The semi-portable nature of the system and low site-engineering requirements allow for rapid deployments and targeted applications during seasonal migrations.","PeriodicalId":54262,"journal":{"name":"Management of Biological Invasions","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69555457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2022-01-01DOI: 10.3391/mbi.2022.13.4.04
W. Komatsu, I. Saeki
Invasions of exotic herbivores often result in considerable damage to vegetation. Slugs are one of the herbivores that pose a high risk of altering vegetation when introduced to new sites. The large invasive slug, Limax maximus , was recently introduced into Japan. We examined its feeding behavior to assess potential effects on vegetation at introduced sites. We conducted two complementary experiments: feeding trials and DNA meta-barcoding analyses. In the feeding trials, we provided L. maximus with 23 test plants and calculated Acceptability Index (AI) values to evaluate palatability. Limax maximus clearly favored specific plants; average AI was highest for Brassica oleracea , followed by Lactuca indica, and Sambucus racemosa . DNA meta-barcoding analyses identified plants from six families in the feces of wild individuals. According to the generalized linear mixed model analyses, the plants that L. maximus preferred to eat were crops, herbaceous plants, and plants with glabrous leaves. Because native slugs and land snails do not show these preferences, L. maximus may exert herbivory pressure on native and agricultural plants that is different from that exerted by native molluscan communities. Our work demonstrated that combining multiple methods helps to estimate the potential risk of exotic herbivory in natural ecosystems. Additional research should examine
{"title":"Feeding habits of the exotic invasive slug Limax maximus: a basis for risk assessment of herbivory on forest and agricultural ecosystems","authors":"W. Komatsu, I. Saeki","doi":"10.3391/mbi.2022.13.4.04","DOIUrl":"https://doi.org/10.3391/mbi.2022.13.4.04","url":null,"abstract":"Invasions of exotic herbivores often result in considerable damage to vegetation. Slugs are one of the herbivores that pose a high risk of altering vegetation when introduced to new sites. The large invasive slug, Limax maximus , was recently introduced into Japan. We examined its feeding behavior to assess potential effects on vegetation at introduced sites. We conducted two complementary experiments: feeding trials and DNA meta-barcoding analyses. In the feeding trials, we provided L. maximus with 23 test plants and calculated Acceptability Index (AI) values to evaluate palatability. Limax maximus clearly favored specific plants; average AI was highest for Brassica oleracea , followed by Lactuca indica, and Sambucus racemosa . DNA meta-barcoding analyses identified plants from six families in the feces of wild individuals. According to the generalized linear mixed model analyses, the plants that L. maximus preferred to eat were crops, herbaceous plants, and plants with glabrous leaves. Because native slugs and land snails do not show these preferences, L. maximus may exert herbivory pressure on native and agricultural plants that is different from that exerted by native molluscan communities. Our work demonstrated that combining multiple methods helps to estimate the potential risk of exotic herbivory in natural ecosystems. Additional research should examine","PeriodicalId":54262,"journal":{"name":"Management of Biological Invasions","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69555662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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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