Spatial and ontogenetic variation in isotopic niche among recovering fish communities revealed by Bayesian modeling

Exploitation and changing ocean conditions have resulted in altered species interactions and varied population dynamics within marine fish communities off northeast Newfoundland and southern Labrador, Canada. To understand contemporary species interactions, we quantified the isotopic niches, niche o...

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Veröffentlicht in:PloS one 2019-04, Vol.14 (4), p.e0215747-e0215747
Hauptverfasser: Krumsick, Kyle J, Fisher, Jonathan A D
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description Exploitation and changing ocean conditions have resulted in altered species interactions and varied population dynamics within marine fish communities off northeast Newfoundland and southern Labrador, Canada. To understand contemporary species interactions, we quantified the isotopic niches, niche overlap, and ontogenetic niche change among seven dominant fish species using stable isotope analyses. Analyses used fishes from three regions differing in fish and prey diversities. Differences in fish and diet composition diversity among regions were found using Simpson's inverse diversity index. The regions of lowest diversities had higher instances of niche overlap and higher percentage of niche overlap area. The region of highest diversity had the widest spread of niches with greater distances from the community centroid. Ontogenetic shifts were observed such that larger individuals shifted towards the community centroid with the exception of Atlantic cod. Atlantic cod in particular was found to consistently be the top predator of the analyzed species. Our results reveal: (a) overlap in isotopic niches and spread within niche space was correlated with fish and diet diversity; (b) ontogenetic shifts are important when considering a species' niche and quantifying spatial variation in community niche profiles.
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Our results reveal: (a) overlap in isotopic niches and spread within niche space was correlated with fish and diet diversity; (b) ontogenetic shifts are important when considering a species' niche and quantifying spatial variation in community niche profiles.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>30998793</pmid><doi>10.1371/journal.pone.0215747</doi><tpages>e0215747</tpages><orcidid>https://orcid.org/0000-0002-1699-3735</orcidid><oa>free_for_read</oa></addata></record>
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subjects Animals
Bayesian analysis
Biodiversity
Cod
Commercial fishing
Communities
Consumption
Coral reefs
Diet
Ecosystems
Exploitation
Fish
Fish populations
Fisheries management
Fishes
Fishing
Food Chain
Food chains
Gadus morhua - physiology
Genetic variation
Marine fish
Marine fishes
Models, Biological
Newfoundland and Labrador
Niche overlap
Niches
Niches (Ecology)
Ocean models
Oceans
Ontogeny
Population biology
Population Dynamics
Prey
Species
Species diversity
Stable isotopes
title Spatial and ontogenetic variation in isotopic niche among recovering fish communities revealed by Bayesian modeling
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