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Titolo:
Breeding location choice in salmon: causes (habitat, competition, body size, energy stores) and consequences (life span, energy stores)
Autore:
Hendry, AP; Berg, OK; Quinn, TP;
Indirizzi:
Univ Washington, Sch Aquat & Fishery Sci, Seattle, WA 98195 USA Univ Washington Seattle WA USA 98195 & Fishery Sci, Seattle, WA 98195 USA Norwegian Univ Sci & Technol, NTNU, Dept Zool, N-7491 Trondheim, Norway Norwegian Univ Sci & Technol Trondheim Norway N-7491 1 Trondheim, Norway
Titolo Testata:
OIKOS
fascicolo: 3, volume: 93, anno: 2001,
pagine: 407 - 418
SICI:
0030-1299(200106)93:3<407:BLCISC>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
FEMALE SOCKEYE-SALMON; ONCORHYNCHUS-NERKA; REPRODUCTIVE-BEHAVIOR; PACIFIC SALMON; SEXUAL SELECTION; SUCCESS; ECOLOGY; SENESCENCE; PREDATION; KISUTCH;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Hendry, AP Univ Massachusetts, Organism & Evolutionary Biol Program, Amherst, MA 01003 USA Univ Massachusetts Amherst MA USA 01003 Amherst, MA 01003 USA
Citazione:
A.P. Hendry et al., "Breeding location choice in salmon: causes (habitat, competition, body size, energy stores) and consequences (life span, energy stores)", OIKOS, 93(3), 2001, pp. 407-418

Abstract

Breeding location choice provides a mechanism by which individuals can directly influence their reproductive success. Location choice should therefore reflect individual condition, habitat features, and the intensity of competition; with these factors then influencing reproductive success. To test whether such patterns were detectable in the wild, we tagged 705 sockeye salmon (Oncorhynchus nerka) in a natural population, and monitored them from when they started breeding until they died. We evaluated the role of individual condition (size, secondary sexual traits, energy stores) in the acquisition of breeding locations that differed in the intensity of competition (female density, sex ratio) and habitat Features (water depth, water velocity). We than evaluated the influence of breeding location on reproductive life span and energy stores. At a coarse level (20-m stream sections), females consistently settled in certain locations, and these locations sustained high densities and held larger females. At a fine scale (0.5-m breeding sites), ii) larger fish occupied deeper water (males, r(2) = 0.0721 females, r(2) = 0.199), (2) higher levels of competition reduced reproductive life span for males (r(2) = 0.139) but not females, and (3) fish with shorter reproductive life spans died with more energy remaining in their muscle tissue (males, r(2) = 0.414; Females, r(2) = 0.440). These patterns were nested within a tendency for late breeding fish to have shorter reproductive life spans. Energy stores and secondary sexual traits did not influence breeding location choice, and larger fish did not acquire locations of higher intrinsic quality (i.e., those sections settled first and sustaining higher competition). Our study provides evidence that some aspects of individual condition influence breeding location choice, which then influences components of reproductive success.

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Documento generato il 29/03/20 alle ore 15:41:31