{"title":"在一条受到管制的亚北极河流中改善产卵基质以保护底栖鱼类的效果","authors":"M. Miller, C. Stevens, M. S. Poesch","doi":"10.1002/rra.4358","DOIUrl":null,"url":null,"abstract":"Initial observations of egg mortality downstream of a hydroelectric facility on the Yellowknife River in the Northwest Territories prompted the investigation of habitat use by adfluvial lake trout (<jats:italic>Salvelinus namaycush</jats:italic>), lake whitefish (<jats:italic>Coregonus clupeaformis</jats:italic>), and cisco (<jats:italic>Coregonus artedi</jats:italic>). It was conducted to meet regulatory requirements under the Fisheries Act (1985) for the facility and was focused on results from annual snorkel surveys completed from 2016 to 2019. The design principles of the installed habitat were based on habitat rehabilitation projects for anadromous salmonids in rivers, artificial spawning reefs constructed in lakes for lacustrine populations of lake trout, and lake whitefish and the 2016 study results. The evaluation of the installed habitat was based on results from snorkel surveys that collected data on egg density and survival using 1 m<jats:sup>2</jats:sup> plots on both natural and artificially enhanced substrates. Three years of postenhancement monitoring indicated higher egg densities and a greater proportion of live eggs in the artificially enhanced habitat compared to the natural habitat, with more pronounced trends observed for coregonids (lake whitefish and cisco) compared to lake trout. These findings suggest that habitat enhancement has the potential to enhance juvenile recruitment for adfluvial fish. A critical factor in the design was ensuring the substrate composition provided adequate interstitial spaces for egg development and protection. This study represents the first documented attempt at habitat improvement in a regulated sub‐Arctic river in Canada. The results and design principles for the installed habitat offer a valuable framework for new or existing development projects in Northern Canada that require conservation actions to maintain fisheries productivity.","PeriodicalId":21513,"journal":{"name":"River Research and Applications","volume":"41 1","pages":""},"PeriodicalIF":1.7000,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effectiveness of spawning substrate enhancement for adfluvial fish in a regulated sub‐Arctic river\",\"authors\":\"M. Miller, C. Stevens, M. S. Poesch\",\"doi\":\"10.1002/rra.4358\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Initial observations of egg mortality downstream of a hydroelectric facility on the Yellowknife River in the Northwest Territories prompted the investigation of habitat use by adfluvial lake trout (<jats:italic>Salvelinus namaycush</jats:italic>), lake whitefish (<jats:italic>Coregonus clupeaformis</jats:italic>), and cisco (<jats:italic>Coregonus artedi</jats:italic>). It was conducted to meet regulatory requirements under the Fisheries Act (1985) for the facility and was focused on results from annual snorkel surveys completed from 2016 to 2019. The design principles of the installed habitat were based on habitat rehabilitation projects for anadromous salmonids in rivers, artificial spawning reefs constructed in lakes for lacustrine populations of lake trout, and lake whitefish and the 2016 study results. The evaluation of the installed habitat was based on results from snorkel surveys that collected data on egg density and survival using 1 m<jats:sup>2</jats:sup> plots on both natural and artificially enhanced substrates. Three years of postenhancement monitoring indicated higher egg densities and a greater proportion of live eggs in the artificially enhanced habitat compared to the natural habitat, with more pronounced trends observed for coregonids (lake whitefish and cisco) compared to lake trout. These findings suggest that habitat enhancement has the potential to enhance juvenile recruitment for adfluvial fish. A critical factor in the design was ensuring the substrate composition provided adequate interstitial spaces for egg development and protection. This study represents the first documented attempt at habitat improvement in a regulated sub‐Arctic river in Canada. The results and design principles for the installed habitat offer a valuable framework for new or existing development projects in Northern Canada that require conservation actions to maintain fisheries productivity.\",\"PeriodicalId\":21513,\"journal\":{\"name\":\"River Research and Applications\",\"volume\":\"41 1\",\"pages\":\"\"},\"PeriodicalIF\":1.7000,\"publicationDate\":\"2024-08-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"River Research and Applications\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://doi.org/10.1002/rra.4358\",\"RegionNum\":4,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"ENVIRONMENTAL SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"River Research and Applications","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1002/rra.4358","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
Effectiveness of spawning substrate enhancement for adfluvial fish in a regulated sub‐Arctic river
Initial observations of egg mortality downstream of a hydroelectric facility on the Yellowknife River in the Northwest Territories prompted the investigation of habitat use by adfluvial lake trout (Salvelinus namaycush), lake whitefish (Coregonus clupeaformis), and cisco (Coregonus artedi). It was conducted to meet regulatory requirements under the Fisheries Act (1985) for the facility and was focused on results from annual snorkel surveys completed from 2016 to 2019. The design principles of the installed habitat were based on habitat rehabilitation projects for anadromous salmonids in rivers, artificial spawning reefs constructed in lakes for lacustrine populations of lake trout, and lake whitefish and the 2016 study results. The evaluation of the installed habitat was based on results from snorkel surveys that collected data on egg density and survival using 1 m2 plots on both natural and artificially enhanced substrates. Three years of postenhancement monitoring indicated higher egg densities and a greater proportion of live eggs in the artificially enhanced habitat compared to the natural habitat, with more pronounced trends observed for coregonids (lake whitefish and cisco) compared to lake trout. These findings suggest that habitat enhancement has the potential to enhance juvenile recruitment for adfluvial fish. A critical factor in the design was ensuring the substrate composition provided adequate interstitial spaces for egg development and protection. This study represents the first documented attempt at habitat improvement in a regulated sub‐Arctic river in Canada. The results and design principles for the installed habitat offer a valuable framework for new or existing development projects in Northern Canada that require conservation actions to maintain fisheries productivity.
期刊介绍:
River Research and Applications , previously published as Regulated Rivers: Research and Management (1987-2001), is an international journal dedicated to the promotion of basic and applied scientific research on rivers. The journal publishes original scientific and technical papers on biological, ecological, geomorphological, hydrological, engineering and geographical aspects related to rivers in both the developed and developing world. Papers showing how basic studies and new science can be of use in applied problems associated with river management, regulation and restoration are encouraged as is interdisciplinary research concerned directly or indirectly with river management problems.