Morphometric trait measurements of Arctic char in foothill lakes of arctic Alaska

Polymorphism facilitates coexistence of divergent morphs (e.g., phenotypes) of the same species by minimizing intraspecific competition, especially when resources are limiting. Arctic char (Salvelinus sp .) are a Holarctic fish often forming morphologically, and sometimes genetically, divergent morp...

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Main Author: Klobucar, Stephen
Format: Other/Unknown Material
Language:unknown
Published: Zenodo 2022
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Online Access:https://doi.org/10.5061/dryad.80gb5mkqc
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spelling ftzenodo:oai:zenodo.org:5831930 2024-09-09T19:21:24+00:00 Morphometric trait measurements of Arctic char in foothill lakes of arctic Alaska Klobucar, Stephen 2022-01-09 https://doi.org/10.5061/dryad.80gb5mkqc unknown Zenodo https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.80gb5mkqc oai:zenodo.org:5831930 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode info:eu-repo/semantics/other 2022 ftzenodo https://doi.org/10.5061/dryad.80gb5mkqc 2024-07-27T05:14:26Z Polymorphism facilitates coexistence of divergent morphs (e.g., phenotypes) of the same species by minimizing intraspecific competition, especially when resources are limiting. Arctic char (Salvelinus sp .) are a Holarctic fish often forming morphologically, and sometimes genetically, divergent morphs. In this study, we assessed the morphological and genetic diversity and divergence of 263 individuals from seven populations of arctic char with varying length-frequency distributions across two distinct groups of lakes in northern Alaska. Despite close geographic proximity, each lake group occurs on landscapes with different glacial ages and surface water connectivity, and thus were likely colonized by fishes at different times. Across lakes, a continuum of physical (e.g., lake area, maximum depth) and biological characteristics (e.g., primary productivity, fish density) exists, likely contributing to characteristics of present-day char populations. Although some lakes exhibit bimodal size distributions, using model-based clustering of morphometric traits corrected for allometry, we did not detect morphological differences within and across char populations. Genomic analyses using 15,934 SNPs obtained from genotyping-by-sequencing demonstrated differences among lake groups related to historical biogeography, but within lake groups and within individual lakes, genetic differentiation was not related to total body length. We used PERMANOVA to identify environmental and biological factors related to observed char size structure. Significant predictors included water transparency (i.e., a primary productivity proxy), char density (fish·ha -1 ), and lake group. Larger char occurred in lakes with greater primary production and lower char densities, suggesting less intraspecific competition and resource limitation. Thus, char populations in more productive and connected lakes may prove more stable to environmental changes, relative to food-limited and closed lakes, if lake productivity increases concomitantly. Our ... Other/Unknown Material Arctic Alaska Zenodo Arctic
institution Open Polar
collection Zenodo
op_collection_id ftzenodo
language unknown
description Polymorphism facilitates coexistence of divergent morphs (e.g., phenotypes) of the same species by minimizing intraspecific competition, especially when resources are limiting. Arctic char (Salvelinus sp .) are a Holarctic fish often forming morphologically, and sometimes genetically, divergent morphs. In this study, we assessed the morphological and genetic diversity and divergence of 263 individuals from seven populations of arctic char with varying length-frequency distributions across two distinct groups of lakes in northern Alaska. Despite close geographic proximity, each lake group occurs on landscapes with different glacial ages and surface water connectivity, and thus were likely colonized by fishes at different times. Across lakes, a continuum of physical (e.g., lake area, maximum depth) and biological characteristics (e.g., primary productivity, fish density) exists, likely contributing to characteristics of present-day char populations. Although some lakes exhibit bimodal size distributions, using model-based clustering of morphometric traits corrected for allometry, we did not detect morphological differences within and across char populations. Genomic analyses using 15,934 SNPs obtained from genotyping-by-sequencing demonstrated differences among lake groups related to historical biogeography, but within lake groups and within individual lakes, genetic differentiation was not related to total body length. We used PERMANOVA to identify environmental and biological factors related to observed char size structure. Significant predictors included water transparency (i.e., a primary productivity proxy), char density (fish·ha -1 ), and lake group. Larger char occurred in lakes with greater primary production and lower char densities, suggesting less intraspecific competition and resource limitation. Thus, char populations in more productive and connected lakes may prove more stable to environmental changes, relative to food-limited and closed lakes, if lake productivity increases concomitantly. Our ...
format Other/Unknown Material
author Klobucar, Stephen
spellingShingle Klobucar, Stephen
Morphometric trait measurements of Arctic char in foothill lakes of arctic Alaska
author_facet Klobucar, Stephen
author_sort Klobucar, Stephen
title Morphometric trait measurements of Arctic char in foothill lakes of arctic Alaska
title_short Morphometric trait measurements of Arctic char in foothill lakes of arctic Alaska
title_full Morphometric trait measurements of Arctic char in foothill lakes of arctic Alaska
title_fullStr Morphometric trait measurements of Arctic char in foothill lakes of arctic Alaska
title_full_unstemmed Morphometric trait measurements of Arctic char in foothill lakes of arctic Alaska
title_sort morphometric trait measurements of arctic char in foothill lakes of arctic alaska
publisher Zenodo
publishDate 2022
url https://doi.org/10.5061/dryad.80gb5mkqc
geographic Arctic
geographic_facet Arctic
genre Arctic
Alaska
genre_facet Arctic
Alaska
op_relation https://zenodo.org/communities/dryad
https://doi.org/10.5061/dryad.80gb5mkqc
oai:zenodo.org:5831930
op_rights info:eu-repo/semantics/openAccess
Creative Commons Zero v1.0 Universal
https://creativecommons.org/publicdomain/zero/1.0/legalcode
op_doi https://doi.org/10.5061/dryad.80gb5mkqc
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