Pacific herring (Clupea pallasii) as a key forage fish in the southeastern Gulf of Alaska

Surma, Szymon; Pakhomov, Evgeny A.; Pitcher, Tony J.

doi:10.1016/j.dsr2.2021.105001

Cited by 3 publications

(1 citation statement)

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“…Thus, the overall topology of the guilds’ n-dimensional space did not change, but species segregated differently from one another in higher dimensions. As herring stocks decreased over time since the 1950s due to depletion by commercial fisheries 82 , a generalist species’ (double-crested cormorant) hypervolume remained constant while a specialist species’ (pelagic cormorant) hypervolume decreased, illustrating how the topology can change over time.…”

Section: Discussionmentioning

confidence: 99%

Amino acid-specific isotopes reveal changing five-dimensional niche segregation in Pacific seabirds over 50 years

van Oordt,

Cuba,

Choy

et al. 2024

Sci Rep

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Hutchison’s niche theory suggests that coexisting competing species occupy non-overlapping hypervolumes, which are theoretical spaces encompassing more than three dimensions, within an n-dimensional space. The analysis of multiple stable isotopes can be used to test these ideas where each isotope can be considered a dimension of niche space. These hypervolumes may change over time in response to variation in behaviour or habitat, within or among species, consequently changing the niche space itself. Here, we use isotopic values of carbon and nitrogen of ten amino acids, as well as sulphur isotopic values, to produce multi-isotope models to examine niche segregation among an assemblage of five coexisting seabird species (ancient murrelet Synthliboramphus antiquus, double-crested cormorant Phalacrocorax auritus, Leach’s storm-petrel Oceanodrama leucorhoa, rhinoceros auklet Cerorhinca monocerata, pelagic cormorant Phalacrocorax pelagicus) that inhabit coastal British Columbia. When only one or two isotope dimensions were considered, the five species overlapped considerably, but segregation increased in more dimensions, but often in complex ways. Thus, each of the five species occupied their own isotopic hypervolume (niche), but that became apparent only when factoring the increased information from sulphur and amino acid specific isotope values, rather than just relying on proxies of δ15N and δ13C alone. For cormorants, there was reduction of niche size for both species consistent with a decline in their dominant prey, Pacific herring Clupea pallasii, from 1970 to 2006. Consistent with niche theory, cormorant species showed segregation across time, with the double-crested demonstrating a marked change in diet in response to prey shifts in a higher dimensional space. In brief, incorporating multiple isotopes (sulfur, PC1 of δ15N [baselines], PC2 of δ15N [trophic position], PC1 and PC2 of δ13C) metrics allowed us to infer changes and differences in food web topology that were not apparent from classic carbon–nitrogen biplots.

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Section: Discussionmentioning

confidence: 99%

Amino acid-specific isotopes reveal changing five-dimensional niche segregation in Pacific seabirds over 50 years

van Oordt,

Cuba,

Choy

et al. 2024

Sci Rep

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Autochthonous psychrophilic hydrocarbonoclastic bacteria and its ecological function in contaminated cold environments

et al. 2023

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Systematic Review of Multi-Species Models in Fisheries: Key Features and Current Trends

Couve,

Bahamon,

Canales

et al. 2024

Fishes

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In the context of ecosystem-based fisheries management (EBFM), multi-species models offer a potential alternative to traditional single-species models for managing key species, particularly in mixed-fishery settings. These models account for interactions between different species, providing a more holistic approach to fisheries compared to traditional single-species management. There is currently no comprehensive list or recent analysis of the diverse methods used to account for species interactions in fisheries worldwide. We conducted a systematic review to objectively present the current multi-species models used in fisheries. The systematic search identified 86 multi-species models, which were then evaluated to assess their similarities. Employing a clustering analysis, three distinct groups were identified: extensions of single-species/dynamic multi-species models, aggregated ecosystem models, and end-to-end/coupled and hybrid models. The first group was among the most diverse, owing to their ability to integrate biological components, while maintaining an intermediate level of complexity. The second group, primarily defined by the EwE method, features an aggregated biomass pool structure incorporating biological components and environmental effects. The third cluster featured the most complex models, which included a comprehensive representation of size and age structure, the ability to incorporate biological components and environmental effects, as well as spatial representation. The application of these methods is primarily concentrated on small pelagic and demersal species from North America and Europe. This analysis provides a comprehensive guide for stakeholders on the development and use of multi-species models, considering data constraints and regional contexts.

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Pacific herring (Clupea pallasii) as a key forage fish in the southeastern Gulf of Alaska

Cited by 3 publications

References 100 publications

Amino acid-specific isotopes reveal changing five-dimensional niche segregation in Pacific seabirds over 50 years

Amino acid-specific isotopes reveal changing five-dimensional niche segregation in Pacific seabirds over 50 years

Autochthonous psychrophilic hydrocarbonoclastic bacteria and its ecological function in contaminated cold environments

Systematic Review of Multi-Species Models in Fisheries: Key Features and Current Trends

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