{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,2,21]],"date-time":"2025-02-21T14:09:20Z","timestamp":1740146960631,"version":"3.37.3"},"reference-count":115,"publisher":"Public Library of Science (PLoS)","issue":"3","license":[{"start":{"date-parts":[[2024,3,18]],"date-time":"2024-03-18T00:00:00Z","timestamp":1710720000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100008530","name":"European Regional Development Fund","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100008530","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Swiss Confederation and cantons"},{"name":"International Lake Constance Fishery Commission"},{"name":"Landesanstalt f\u00fcr Umwelt Baden-W\u00fcrttemberg"}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"abstract":"<jats:p>The EU Water Framework Directive requires monitoring of the ecological status of lakes, with fish as a relevant class of biotic quality indicator, but monitoring fish populations in large lakes is demanding. This study evaluated use in Lake Constance of a novel multi-mesh gillnet modified to reduce catch numbers. In direct comparison with conventional European Committee for Standardization (CEN) nets we achieved 48% reduction in fish mortality with 38% less labour for tasks directly influenced by fish catch numbers, while maintaining comparable species composition and catch per unit effort. Comparison of mesh sizes indicated no significant reduction in species detection in area-reduced panels of the small mesh sizes, while total observed species richness was greater when using the modified nets. Differences in benthic species communities among depth strata were common, while those of pelagic zones were more homogeneous and did not differ significantly with depth. Catches of different net types from the same depth stratum did not exhibit significant differences. The dominance structure of the most common species, relevant to lake assessment, was similar in catches of both net types, suggesting overall superiority of the modified nets in Lake Constance. Sampling conducted according to standard European CEN protocol, while deploying 60% fewer nets, yielded sufficiently precise abundance estimates for monitoring shallow areas of the benthic zone. A 50% difference in the abundance of dominant species was detected among sampling events with a certainty of 95%. The sample did not provide comparable accuracy in deep benthic strata or the pelagic zone, but was adequate to record complete inventories of species present. Based on this trial data, a new stratified sampling design is proposed for monitoring large lake fish communities for ecological assessment. Depth-dependent fish communities were used to calculate the required number of nets, which resulted in a 69% reduction for the entire lake compared to the CEN calculation method. Using the modified nets increases the feasibility of performing WFD surveys, by reducing effort and cost, while the simultaneous halving of fish mortality minimises the negative impact of fish surveys.<\/jats:p>","DOI":"10.1371\/journal.pone.0299774","type":"journal-article","created":{"date-parts":[[2024,3,18]],"date-time":"2024-03-18T17:45:55Z","timestamp":1710783955000},"page":"e0299774","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":0,"title":["Obtaining accurate population estimates with reduced workload and lower fish mortality in multi-mesh gillnet sampling of a large pre-alpine lake"],"prefix":"10.1371","volume":"19","author":[{"given":"Steffen","family":"Bader","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0009-0003-4933-2612","authenticated-orcid":true,"given":"Julia","family":"Gaye-Siessegger","sequence":"additional","affiliation":[]},{"given":"Barbara","family":"Scholz","sequence":"additional","affiliation":[]},{"given":"M\u00e1rio","family":"Mota-Ferreira","sequence":"additional","affiliation":[]},{"given":"Alexander","family":"Brinker","sequence":"additional","affiliation":[]}],"member":"340","published-online":{"date-parts":[[2024,3,18]]},"reference":[{"key":"pone.0299774.ref001","doi-asserted-by":"crossref","first-page":"75","DOI":"10.1146\/annurev-environ-021810-094524","article-title":"State of the world\u2019s freshwater ecosystems: physical, chemical, and biological changes.","volume":"36","author":"SR Carpenter","year":"2011","journal-title":"Annual review of Environment and Resources."},{"issue":"4","key":"pone.0299774.ref002","doi-asserted-by":"crossref","first-page":"330","DOI":"10.1093\/biosci\/biaa002","article-title":"Bending the Curve of Global Freshwater Biodiversity Loss: An Emergency Recovery Plan","volume":"70","author":"D Tickner","year":"2020","journal-title":"BioScience"},{"issue":"1","key":"pone.0299774.ref003","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/s10750-012-1182-1","article-title":"Impacts of climate warming on the long-term dynamics of key fish species in 24 European lakes","volume":"694","author":"E Jeppesen","year":"2012","journal-title":"Hydrobiologia"},{"issue":"11","key":"pone.0299774.ref004","doi-asserted-by":"crossref","first-page":"809","DOI":"10.1038\/nclimate1581","article-title":"Harmful filamentous cyanobacteria favoured by reduced water turnover with lake warming","volume":"2","author":"T Posch","year":"2012","journal-title":"Nature Climate Change"},{"key":"pone.0299774.ref005","first-page":"388","article-title":"Global lake responses to climate change. 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