Pub Date : 2023-01-24DOI: 10.1080/02705060.2023.2173322
Na Guan, Xiaojia Tang, Minli Xu, Yun Cao
{"title":"Study on the water level ecological amplitude of the wetland plant Triarrhena lularioriparia","authors":"Na Guan, Xiaojia Tang, Minli Xu, Yun Cao","doi":"10.1080/02705060.2023.2173322","DOIUrl":"https://doi.org/10.1080/02705060.2023.2173322","url":null,"abstract":"","PeriodicalId":54830,"journal":{"name":"Journal of Freshwater Ecology","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49556456","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 : 2023-01-23DOI: 10.1080/02705060.2023.2172084
A. Addo-Bediako
{"title":"Effects of trace elements on benthic macroinvertebrate distribution in the sediments of two rivers in the Olifants River Basin, South Africa","authors":"A. Addo-Bediako","doi":"10.1080/02705060.2023.2172084","DOIUrl":"https://doi.org/10.1080/02705060.2023.2172084","url":null,"abstract":"","PeriodicalId":54830,"journal":{"name":"Journal of Freshwater Ecology","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44707827","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 : 2023-01-20DOI: 10.1080/02705060.2022.2144956
Siwei Liu, Wanchun Luo, Liyan Ge, Yanpeng Wang
{"title":"An evaluation method for the priority protection of fishes based on multiple ecological dimensions","authors":"Siwei Liu, Wanchun Luo, Liyan Ge, Yanpeng Wang","doi":"10.1080/02705060.2022.2144956","DOIUrl":"https://doi.org/10.1080/02705060.2022.2144956","url":null,"abstract":"","PeriodicalId":54830,"journal":{"name":"Journal of Freshwater Ecology","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46841522","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 : 2023-01-19DOI: 10.1080/02705060.2022.2158140
Yang Xu, Haihua Cheng, Jilun Meng, Binpeng Xu, Xilian Li, P. Shen, Zhenyuan Huang, Qiang Gao
{"title":"Study on the quality and symbiotic microbial composition of Artemia nauplii in three main producing areas","authors":"Yang Xu, Haihua Cheng, Jilun Meng, Binpeng Xu, Xilian Li, P. Shen, Zhenyuan Huang, Qiang Gao","doi":"10.1080/02705060.2022.2158140","DOIUrl":"https://doi.org/10.1080/02705060.2022.2158140","url":null,"abstract":"","PeriodicalId":54830,"journal":{"name":"Journal of Freshwater Ecology","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42572110","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 : 2023-01-19DOI: 10.1080/02705060.2023.2170484
A. Mohammed, S. Mengistou, T. Fetahi
{"title":"Role of environmental variables and seasonal mixing in dynamics of the phytoplankton community in a Tropical Highland Lake Ardibo, Ethiopia","authors":"A. Mohammed, S. Mengistou, T. Fetahi","doi":"10.1080/02705060.2023.2170484","DOIUrl":"https://doi.org/10.1080/02705060.2023.2170484","url":null,"abstract":"","PeriodicalId":54830,"journal":{"name":"Journal of Freshwater Ecology","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43276399","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 : 2022-11-11DOI: 10.1080/02705060.2022.2147230
Mijia Zhu, R. Tian, Xian-qing Yin, Shouliang Luo, Qing-Jin Luo
Abstract The endangered Chinese giant salamander (Andrias davidianus) is an endangered species among the conserved Chinese amphibians. Tourism-related pressures have increased for this species recently. The effect of tourism on the hatching rate of the target species was determined by experimentally observing the influences of different intensities of tourism disturbance on salamander in the Zhangjiajie Chinese Giant Salamander National Nature Reserve. Water quality factors (e.g. total nitrogen, total phosphorus, dissolved oxygen and Escherichia coli abundance) were analysed, and hatching rate was estimated. Results showed that high levels of tourism disturbance (500,000–1,200,000 visitors per year) had active effects on the hatching time and negative effects on the hatching rate. The prediction performance of artificial neural network models was validated by the low root mean square error values of 2.2539 and 3.2612 for the training and testing data and high determination coefficient values of 0.9732 and 0.9508 for the training and testing data, respectively. The potential for positive or negative feedback mechanisms in such relationships between tourists and wildlife highlights the importance of considering both sides of the complex interaction to find a balance between the development of tourism and wild animal protection. HIGHLIGHTS High tourism disturbance deteriorated the water quality. Artificial neural network model was successfully used in predicting the hatching rate. A mutual relationship was observed between salamander and tourists.
{"title":"Modelling the effect of tourism disturbance on hatching rate of the Chinese giant salamander (Andrias davidianus) by using artificial neural network","authors":"Mijia Zhu, R. Tian, Xian-qing Yin, Shouliang Luo, Qing-Jin Luo","doi":"10.1080/02705060.2022.2147230","DOIUrl":"https://doi.org/10.1080/02705060.2022.2147230","url":null,"abstract":"Abstract The endangered Chinese giant salamander (Andrias davidianus) is an endangered species among the conserved Chinese amphibians. Tourism-related pressures have increased for this species recently. The effect of tourism on the hatching rate of the target species was determined by experimentally observing the influences of different intensities of tourism disturbance on salamander in the Zhangjiajie Chinese Giant Salamander National Nature Reserve. Water quality factors (e.g. total nitrogen, total phosphorus, dissolved oxygen and Escherichia coli abundance) were analysed, and hatching rate was estimated. Results showed that high levels of tourism disturbance (500,000–1,200,000 visitors per year) had active effects on the hatching time and negative effects on the hatching rate. The prediction performance of artificial neural network models was validated by the low root mean square error values of 2.2539 and 3.2612 for the training and testing data and high determination coefficient values of 0.9732 and 0.9508 for the training and testing data, respectively. The potential for positive or negative feedback mechanisms in such relationships between tourists and wildlife highlights the importance of considering both sides of the complex interaction to find a balance between the development of tourism and wild animal protection. HIGHLIGHTS High tourism disturbance deteriorated the water quality. Artificial neural network model was successfully used in predicting the hatching rate. A mutual relationship was observed between salamander and tourists.","PeriodicalId":54830,"journal":{"name":"Journal of Freshwater Ecology","volume":"37 1","pages":"597 - 612"},"PeriodicalIF":1.3,"publicationDate":"2022-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42021077","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 : 2022-11-09DOI: 10.1080/02705060.2022.2144957
L. Bower, Brandon K. Peoples
Abstract Understanding habitat use and nursery areas of larval fish is a key component to managing and conserving riverine fishes. Yet, freshwater researchers often focus only on adult fishes, resulting in a limited understanding of the habitat requirements for the early life stages of freshwater fishes. The goal of this study was to quantify the larval fish microhabitat use of three fish families in Twelvemile Creek, a fifth-order tributary of Lake Hartwell (Savannah River basin) in the Piedmont ecoregion of South Carolina, USA. We used handheld dipnets to sample larval fishes along 20 equidistant transects spaced 10 m apart weekly from May to July 2021 along a 200 m stream reach. We also collected microhabitat data at each larval fish capture location. Most captured individuals were in the metalarval stage and were identified to the family level. A partial distance-based redundancy analysis indicated that water velocity contributed to changes in larval fish assemblage structure. Larval fishes occupied a subset of the available habitat that was characterized by low water velocity, non-Podostemum substrate, and shallow habitats close to the shore or bed rock structure. We also detected temporal patterns in larval fish counts, with peak Percidae and Leuciscidae counts in late July and the highest Catostomidae counts in late May–early June. Our results suggest that larval fishes select habitats with low water velocity and shallow habitats close to shore microhabitat characteristics, and that riffle-pool sequences may serve as a nursery habitat for Percidae, Catostomidae and Leuciscidae metalarvae. Graphical Abstract
{"title":"Microhabitat use of larval fish in a South Carolina Piedmont stream","authors":"L. Bower, Brandon K. Peoples","doi":"10.1080/02705060.2022.2144957","DOIUrl":"https://doi.org/10.1080/02705060.2022.2144957","url":null,"abstract":"Abstract Understanding habitat use and nursery areas of larval fish is a key component to managing and conserving riverine fishes. Yet, freshwater researchers often focus only on adult fishes, resulting in a limited understanding of the habitat requirements for the early life stages of freshwater fishes. The goal of this study was to quantify the larval fish microhabitat use of three fish families in Twelvemile Creek, a fifth-order tributary of Lake Hartwell (Savannah River basin) in the Piedmont ecoregion of South Carolina, USA. We used handheld dipnets to sample larval fishes along 20 equidistant transects spaced 10 m apart weekly from May to July 2021 along a 200 m stream reach. We also collected microhabitat data at each larval fish capture location. Most captured individuals were in the metalarval stage and were identified to the family level. A partial distance-based redundancy analysis indicated that water velocity contributed to changes in larval fish assemblage structure. Larval fishes occupied a subset of the available habitat that was characterized by low water velocity, non-Podostemum substrate, and shallow habitats close to the shore or bed rock structure. We also detected temporal patterns in larval fish counts, with peak Percidae and Leuciscidae counts in late July and the highest Catostomidae counts in late May–early June. Our results suggest that larval fishes select habitats with low water velocity and shallow habitats close to shore microhabitat characteristics, and that riffle-pool sequences may serve as a nursery habitat for Percidae, Catostomidae and Leuciscidae metalarvae. Graphical Abstract","PeriodicalId":54830,"journal":{"name":"Journal of Freshwater Ecology","volume":"83 1","pages":"583 - 596"},"PeriodicalIF":1.3,"publicationDate":"2022-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59320485","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 : 2022-11-01DOI: 10.1080/02705060.2022.2134220
M. Moreno Pallares, María A. Bonilla Gómez, Gabriel Guillot Monroy, A. Torregroza-Espinosa
Abstract This study aims to assess the physicochemical characteristics regulating the distribution and abundance of M. marcella larvae in six wetlands in the northern Colombia. Standardized techniques for collecting invertebrate and physicochemical data were used in 29 sampling points in an intraannual period. Mean pH and temperature oscillated in narrow ranges within wetlands (7.7 ± 0.09–8.6 ± 0.07; 28.1 ± 0.29–32.8 ± 0.17 °C, respectively), whereas ammonium concentrations and conductivity exhibited a wide variation (0.2 ± 0.03–2.8 ± 0.54 mg NH4 L−1; 861 ± 30.7–19254 ± 1706 µS cm−1, respectively). A total of 2586 individual M. marcella larvae were collected. Abundance was greater in wetlands influenced by the Magdalena River, with 19.4 ± 1.7 and 9.3 ± 1.4 individuals; followed by wetlands hydrologically influenced by seasonal runoff, with 8.1 ± 0.4 and 6.4 ± 0.4 individuals; and lowest in wetlands with influence of the Caribbean Sea, with 3.9 ± 0.3 and 0.3 ± 0.1 individuals. Abundances of M. marcella larvae exhibited similar variations at different months during the sampling period. Abundance and distribution of M. marcella larvae in wetlands of northern Colombia is strongly dependent on water conductivity, transparency and alkalinity. This study evidence that Odonata larvae are a valuable tool as bioindicators for wetland assessment and monitoring.
摘要本研究旨在探讨哥伦比亚北部6个湿地marcella M. marcella幼虫分布和丰度的理化特征。在一年中，在29个采样点使用了收集无脊椎动物和物理化学数据的标准化技术。湿地的平均pH值和温度波动范围较窄(7.7±0.09 ~ 8.6±0.07);(28.1±0.29-32.8±0.17°C)，而铵离子浓度和电导率变化较大(0.2±0.03-2.8±0.54 mg NH4 L−1;861±30.7-19254±1706µS cm−1)。共采集到马尔塞拉小蠊幼虫2586只。受Magdalena河影响的湿地丰度较高，分别为19.4±1.7和9.3±1.4个体;其次是受季节径流影响的湿地，分别为8.1±0.4和6.4±0.4个体;受加勒比海影响的湿地最低，分别为3.9±0.3和0.3±0.1个体。在采样期间，不同月份的马尔塞拉菌幼虫丰度呈现出相似的变化。哥伦比亚北部湿地marcella幼虫的丰度和分布强烈依赖于水的导电性、透明度和碱度。研究结果表明，齿蛾幼虫可作为湿地评价和监测的重要生物指标。
{"title":"Distribution of Miathyria marcella larvae (Odonata: Libellulidae) and water quality of wetlands in Northern Colombia","authors":"M. Moreno Pallares, María A. Bonilla Gómez, Gabriel Guillot Monroy, A. Torregroza-Espinosa","doi":"10.1080/02705060.2022.2134220","DOIUrl":"https://doi.org/10.1080/02705060.2022.2134220","url":null,"abstract":"Abstract This study aims to assess the physicochemical characteristics regulating the distribution and abundance of M. marcella larvae in six wetlands in the northern Colombia. Standardized techniques for collecting invertebrate and physicochemical data were used in 29 sampling points in an intraannual period. Mean pH and temperature oscillated in narrow ranges within wetlands (7.7 ± 0.09–8.6 ± 0.07; 28.1 ± 0.29–32.8 ± 0.17 °C, respectively), whereas ammonium concentrations and conductivity exhibited a wide variation (0.2 ± 0.03–2.8 ± 0.54 mg NH4 L−1; 861 ± 30.7–19254 ± 1706 µS cm−1, respectively). A total of 2586 individual M. marcella larvae were collected. Abundance was greater in wetlands influenced by the Magdalena River, with 19.4 ± 1.7 and 9.3 ± 1.4 individuals; followed by wetlands hydrologically influenced by seasonal runoff, with 8.1 ± 0.4 and 6.4 ± 0.4 individuals; and lowest in wetlands with influence of the Caribbean Sea, with 3.9 ± 0.3 and 0.3 ± 0.1 individuals. Abundances of M. marcella larvae exhibited similar variations at different months during the sampling period. Abundance and distribution of M. marcella larvae in wetlands of northern Colombia is strongly dependent on water conductivity, transparency and alkalinity. This study evidence that Odonata larvae are a valuable tool as bioindicators for wetland assessment and monitoring.","PeriodicalId":54830,"journal":{"name":"Journal of Freshwater Ecology","volume":"37 1","pages":"569 - 581"},"PeriodicalIF":1.3,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43791218","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 : 2022-10-10DOI: 10.1080/02705060.2022.2134219
Joana L. Santos, D. Ebert
Abstract Although the outcome of parasitic infections can be explained by a combination of environmental and host/parasite genetic factors, these factors are often confounded by geography. Thus, linking temperature, a locally variable environmental factor, with host and parasite genetics can reveal complex spatial host-parasite interactions. We used Daphnia magna genotypes from Central Europe, where the Hamiltosporidium tvaerminnensis parasite has not yet been reported, and from two regions where it is frequently found, Northern Europe and Mediterranean basin. In Central Europe habitats are usually permanent and hosts are typically in their planktonic phase during summer – the hottest time of the year. In Northern Europe and the Mediterranean basin, on the other hand, hosts inhabit ponds that frequently dry-up in summer. We predicted that high temperatures during host and parasite active phases would prevent long-term parasite persistence. By exposing all hosts to two parasite isolates at ambient and stressfully high temperatures we tested this prediction. At ambient temperatures, we confirmed that long-term parasite persistence is only possible in Northern and Mediterranean host genotypes, while we observed reduced persistence at high temperature, but only for the Mediterranean hosts. Virulence was higher in Northern host genotypes only at ambient temperature. These results were consistent among the two parasites isolates. Our findings, thus, do not corroborate our hypotheses and suggest that predictions about responses to future climate change are highly complex in this host-parasite system. KEY POLICY HIGHLIGHTS We confirm earlier research showing that at ambient temperature, a microsporidian parasite (Hamiltosporidium tvaerminnensis) persists only in host (Daphnia magna) genotypes, originating from the parasite’s natural geographic range–Northern Europe and around the Mediterranean basin. Extreme temperature highs reduce parasite persistence in Mediterranean host genotypes. In Northern host genotypes, virulence is higher at ambient temperature. Temperature does not explain the geographic mosaic of distribution of the microsporidian parasite. To understand complex host–parasite interactions and the effects of environmental factors on parasitic diseases, both host and parasite need to be studied simultaneously considering their geographic distribution. This can help to predict the response of complex host–parasite interactions to climate change.
{"title":"The effects of temperature and host-parasite interactions on parasite persistence in a planktonic crustacean","authors":"Joana L. Santos, D. Ebert","doi":"10.1080/02705060.2022.2134219","DOIUrl":"https://doi.org/10.1080/02705060.2022.2134219","url":null,"abstract":"Abstract Although the outcome of parasitic infections can be explained by a combination of environmental and host/parasite genetic factors, these factors are often confounded by geography. Thus, linking temperature, a locally variable environmental factor, with host and parasite genetics can reveal complex spatial host-parasite interactions. We used Daphnia magna genotypes from Central Europe, where the Hamiltosporidium tvaerminnensis parasite has not yet been reported, and from two regions where it is frequently found, Northern Europe and Mediterranean basin. In Central Europe habitats are usually permanent and hosts are typically in their planktonic phase during summer – the hottest time of the year. In Northern Europe and the Mediterranean basin, on the other hand, hosts inhabit ponds that frequently dry-up in summer. We predicted that high temperatures during host and parasite active phases would prevent long-term parasite persistence. By exposing all hosts to two parasite isolates at ambient and stressfully high temperatures we tested this prediction. At ambient temperatures, we confirmed that long-term parasite persistence is only possible in Northern and Mediterranean host genotypes, while we observed reduced persistence at high temperature, but only for the Mediterranean hosts. Virulence was higher in Northern host genotypes only at ambient temperature. These results were consistent among the two parasites isolates. Our findings, thus, do not corroborate our hypotheses and suggest that predictions about responses to future climate change are highly complex in this host-parasite system. KEY POLICY HIGHLIGHTS We confirm earlier research showing that at ambient temperature, a microsporidian parasite (Hamiltosporidium tvaerminnensis) persists only in host (Daphnia magna) genotypes, originating from the parasite’s natural geographic range–Northern Europe and around the Mediterranean basin. Extreme temperature highs reduce parasite persistence in Mediterranean host genotypes. In Northern host genotypes, virulence is higher at ambient temperature. Temperature does not explain the geographic mosaic of distribution of the microsporidian parasite. To understand complex host–parasite interactions and the effects of environmental factors on parasitic diseases, both host and parasite need to be studied simultaneously considering their geographic distribution. This can help to predict the response of complex host–parasite interactions to climate change.","PeriodicalId":54830,"journal":{"name":"Journal of Freshwater Ecology","volume":"37 1","pages":"555 - 568"},"PeriodicalIF":1.3,"publicationDate":"2022-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43064822","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 : 2022-10-06DOI: 10.1080/02705060.2022.2133018
Brian E. Mason, M. Wuellner, K. Koupal
Abstract Sediment berms of various heights have developed in the mouths of several coves within Harlan County Reservoir due to a combination of sediment deposition and lateral drift of eroded sediments. These berms can isolate coves from the main reservoir if the berm height is greater than the water elevation of the reservoir. Previous research in other reservoirs has shown that fish communities may differ in coves based on their connection histories. This study examines similarities and differences in fish assemblages between several disconnected coves and connected coves in Harlan County Reservoir. Connected coves had greater species richness and diversity compared to disconnected coves. Fish communities between cove types were relatively similar based on presence-absence data but notably different based on species abundance. Nonmetric multidimensional scaling ordination showed that fish communities were distinct between cove types. Eleven fish species were indicators of connected coves, and two species were indicators of disconnected coves. Disconnected coves had higher abundances of understudied native species rarely found in the main reservoir, such as Orangespotted Sunfish, Green Sunfish and Black Bullhead. Further research evaluating the influence of water quality, food availability, and duration of isolation is needed to understand the effect of cove disconnection on fish communities. Managers can use this information when planning cove renovations by weighing the costs and benefits of either maintaining ecologically distinct coves versus connecting coves and improving habitat accessibility for reservoir fishes.
{"title":"A comparison of fish communities between coves of varying connection to Harlan County Reservoir, Nebraska","authors":"Brian E. Mason, M. Wuellner, K. Koupal","doi":"10.1080/02705060.2022.2133018","DOIUrl":"https://doi.org/10.1080/02705060.2022.2133018","url":null,"abstract":"Abstract Sediment berms of various heights have developed in the mouths of several coves within Harlan County Reservoir due to a combination of sediment deposition and lateral drift of eroded sediments. These berms can isolate coves from the main reservoir if the berm height is greater than the water elevation of the reservoir. Previous research in other reservoirs has shown that fish communities may differ in coves based on their connection histories. This study examines similarities and differences in fish assemblages between several disconnected coves and connected coves in Harlan County Reservoir. Connected coves had greater species richness and diversity compared to disconnected coves. Fish communities between cove types were relatively similar based on presence-absence data but notably different based on species abundance. Nonmetric multidimensional scaling ordination showed that fish communities were distinct between cove types. Eleven fish species were indicators of connected coves, and two species were indicators of disconnected coves. Disconnected coves had higher abundances of understudied native species rarely found in the main reservoir, such as Orangespotted Sunfish, Green Sunfish and Black Bullhead. Further research evaluating the influence of water quality, food availability, and duration of isolation is needed to understand the effect of cove disconnection on fish communities. Managers can use this information when planning cove renovations by weighing the costs and benefits of either maintaining ecologically distinct coves versus connecting coves and improving habitat accessibility for reservoir fishes.","PeriodicalId":54830,"journal":{"name":"Journal of Freshwater Ecology","volume":"37 1","pages":"543 - 554"},"PeriodicalIF":1.3,"publicationDate":"2022-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46625723","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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