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Predicting biomass of resident kōkopu (Galaxias) populations using local habitat characteristics
With the global decline of freshwater fishes, quantifying the body size-specific habitat use of vulnerable species is crucial for accurately evaluating population health, identifying the effects of anthropogenic stressors, and directing effective habitat restoration. Populations of New Zealand’s end...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10013890/ https://www.ncbi.nlm.nih.gov/pubmed/36917579 http://dx.doi.org/10.1371/journal.pone.0261993 |
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author | Crichton, Ben R. J. Hickford, Michael J. H. McIntosh, Angus R. Schiel, David R. |
author_facet | Crichton, Ben R. J. Hickford, Michael J. H. McIntosh, Angus R. Schiel, David R. |
author_sort | Crichton, Ben R. J. |
collection | PubMed |
description | With the global decline of freshwater fishes, quantifying the body size-specific habitat use of vulnerable species is crucial for accurately evaluating population health, identifying the effects of anthropogenic stressors, and directing effective habitat restoration. Populations of New Zealand’s endemic kōkopu species (Galaxias fasciatus, G. argenteus, and G. postvectis) have declined substantially over the last century in response to anthropogenic stressors, including habitat loss, migratory barriers, and invasive species. Despite well-understood habitat associations, key within-habitat features underpinning the reach-scale biomass of small and large kōkopu remain unclear. Here, we investigated whether the total biomass of large (> 90 mm) size classes of each kōkopu species and the composite biomass of all small (≤ 90 mm) kōkopu were associated with components of the physical environment that provided refuge and prey resources across fifty-seven 50-m stream reaches. Because kōkopu are nocturnal, populations were sampled by removal at night using headlamps and hand-nets until reaches were visually depleted. Based on Akaike’s information criterion, greater large banded kōkopu biomass was most parsimoniously explained by greater pool volume and forest cover, greater large giant kōkopu biomass by greater bank cover and pool volume, and greater large shortjaw kōkopu biomass by greater substrate size and pool volume. In contrast, greater composite small kōkopu biomass was best explained by smaller substrate size, reduced bank cover, and greater pool volume. Local habitat associations therefore varied among kōkopu species and size classes. Our study demonstrates the importance of considering the ontogenetic shift in species’ habitat use and provides an effective modelling approach for quantifying size-specific local habitat use of stream-dwelling fish. |
format | Online Article Text |
id | pubmed-10013890 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-100138902023-03-15 Predicting biomass of resident kōkopu (Galaxias) populations using local habitat characteristics Crichton, Ben R. J. Hickford, Michael J. H. McIntosh, Angus R. Schiel, David R. PLoS One Research Article With the global decline of freshwater fishes, quantifying the body size-specific habitat use of vulnerable species is crucial for accurately evaluating population health, identifying the effects of anthropogenic stressors, and directing effective habitat restoration. Populations of New Zealand’s endemic kōkopu species (Galaxias fasciatus, G. argenteus, and G. postvectis) have declined substantially over the last century in response to anthropogenic stressors, including habitat loss, migratory barriers, and invasive species. Despite well-understood habitat associations, key within-habitat features underpinning the reach-scale biomass of small and large kōkopu remain unclear. Here, we investigated whether the total biomass of large (> 90 mm) size classes of each kōkopu species and the composite biomass of all small (≤ 90 mm) kōkopu were associated with components of the physical environment that provided refuge and prey resources across fifty-seven 50-m stream reaches. Because kōkopu are nocturnal, populations were sampled by removal at night using headlamps and hand-nets until reaches were visually depleted. Based on Akaike’s information criterion, greater large banded kōkopu biomass was most parsimoniously explained by greater pool volume and forest cover, greater large giant kōkopu biomass by greater bank cover and pool volume, and greater large shortjaw kōkopu biomass by greater substrate size and pool volume. In contrast, greater composite small kōkopu biomass was best explained by smaller substrate size, reduced bank cover, and greater pool volume. Local habitat associations therefore varied among kōkopu species and size classes. Our study demonstrates the importance of considering the ontogenetic shift in species’ habitat use and provides an effective modelling approach for quantifying size-specific local habitat use of stream-dwelling fish. Public Library of Science 2023-03-14 /pmc/articles/PMC10013890/ /pubmed/36917579 http://dx.doi.org/10.1371/journal.pone.0261993 Text en © 2023 Crichton et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Crichton, Ben R. J. Hickford, Michael J. H. McIntosh, Angus R. Schiel, David R. Predicting biomass of resident kōkopu (Galaxias) populations using local habitat characteristics |
title | Predicting biomass of resident kōkopu (Galaxias) populations using local habitat characteristics |
title_full | Predicting biomass of resident kōkopu (Galaxias) populations using local habitat characteristics |
title_fullStr | Predicting biomass of resident kōkopu (Galaxias) populations using local habitat characteristics |
title_full_unstemmed | Predicting biomass of resident kōkopu (Galaxias) populations using local habitat characteristics |
title_short | Predicting biomass of resident kōkopu (Galaxias) populations using local habitat characteristics |
title_sort | predicting biomass of resident kōkopu (galaxias) populations using local habitat characteristics |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10013890/ https://www.ncbi.nlm.nih.gov/pubmed/36917579 http://dx.doi.org/10.1371/journal.pone.0261993 |
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