Cristin-resultat-ID: 1951881
Sist endret: 27. september 2022, 13:53
NVI-rapporteringsår: 2021
Resultat
Vitenskapelig artikkel
2021

Species interactions, environmental gradients and body size shape population niche width

Bidragsytere:
  • Antti Eloranta
  • Anders Gravbrøt Finstad
  • Odd Terje Sandlund
  • Rune Knudsen
  • Anna Kuparinen og
  • Per-Arne Amundsen

Tidsskrift

Journal of Animal Ecology
ISSN 0021-8790
e-ISSN 1365-2656
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2021
Publisert online: 2021
Trykket: 2022
Volum: 91
Sider: 154 - 169
Open Access

Importkilder

Scopus-ID: 2-s2.0-85118209638

Klassifisering

Vitenskapsdisipliner

Zoologiske og botaniske fag

Beskrivelse Beskrivelse

Tittel

Species interactions, environmental gradients and body size shape population niche width

Sammendrag

Competition for shared resources is commonly assumed to restrict population-level niche width of coexisting species. However, the identity and abundance of coexisting species, the prevailing environmental conditions, and the individual body size may shape the effects of interspecific interactions on species’ niche width. Here we study the effects of interspecific and intraspecific interactions, lake area and altitude, and fish body size on the trophic niche width and resource use of a generalist predator, the littoral-dwelling large, sparsely rakered morph of European whitefish (Coregonus lavaretus; hereafter LSR whitefish). We use stable isotope, diet and survey fishing data from 14 subarctic lakes along an environmental gradient in northern Norway. The isotopic niche width of LSR whitefish showed a humped-shaped relationship with increasing relative abundance of sympatric competitors, suggesting widest population niche at intermediate intensity of interspecific interactions. The isotopic niche width of LSR whitefish tended to decrease with increasing altitude, suggesting reduced niche in colder, less productive lakes. LSR whitefish typically shifted to a higher trophic position and increased reliance on littoral food resources with increasing body size, although between-lake differences in ontogenetic niche shifts were evident. In most lakes, LSR whitefish relied less on littoral food resources than coexisting fishes and the niche overlap between sympatric competitors was most evident among relatively large individuals (>250 mm). Individual niche variation was highest among >200 mm long LSR whitefish, which likely have escaped the predation window of sympatric predators. We demonstrate that intermediate intensity of interspecific interactions may broaden species’ niche width, whereas strong competition for limited resources and high predation risk may suppress niche width in less productive environments. Acknowledging potential humped-shaped relationships between population niche width and interspecific interactions can help us understand species’ responses to environmental disturbance (e.g. climate change and species invasions) as well as the driving forces of niche specialization.

Bidragsytere

Antti Eloranta

  • Tilknyttet:
    Forfatter
    ved NINA akvatisk naturmangfold ved Norsk institutt for naturforskning
  • Tilknyttet:
    Forfatter
    ved Jyväskylän yliopisto

Anders Gravbrøt Finstad

  • Tilknyttet:
    Forfatter
    ved Institutt for naturhistorie ved Norges teknisk-naturvitenskapelige universitet

Odd Terje Sandlund

  • Tilknyttet:
    Forfatter
    ved NINA akvatisk naturmangfold ved Norsk institutt for naturforskning

Rune Knudsen

  • Tilknyttet:
    Forfatter
    ved Institutt for arktisk og marin biologi ved UiT Norges arktiske universitet

Anna Kuparinen

  • Tilknyttet:
    Forfatter
    ved Jyväskylän yliopisto
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