Variation in food intake within groups of juvenile perch

Staffan, Fia; Magnhagen, Carin; Alanärä, Anders

doi:10.1111/j.1095-8649.2002.tb01702.x

Cited by 19 publications

(9 citation statements)

References 15 publications

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“…This is in agreement with previous results on food intake within groups of 0+ perch (Staffan et al 2002). Regardless of fish feeding in groups of three, or, individually, intake rate of dominants exceeded that of subordinates (in groups: dominants 15.04 ± 2.26 daphnia fish )1 min )1 , subordinates 4.11 ± 0.86; individually: dominants 17.10 ± 3.05 daphnia fish )1 min )1 , subordinates 4.20 ± 0.72) (Two way repeated measures ANO-VA: effect of fish status -F=87.78, p < 0.001; effect of foraging group -F=0.45, p = 0.510; no interaction between factors).…”

Section: Resultssupporting

confidence: 94%

“…Dominantsubordinate relationships allow the dominant individuals to obtain a disproportionally bigger share of contestable resources, including not only food, but also a refuge from predators (Grant 1997), which is especially important for juvenile fish. Staffan et al (2002) found variation in food intake within groups of juvenile perch to be considerable, but foraging was not accompanied by any aggressive interactions. The aim of this study was to test the hypothesis that interference competition among 0+ perch might appear in structured habitats when shelter is a limited resource.…”

Section: Introductionmentioning

confidence: 89%

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Contestable shelters provoke aggression among 0+ perch, Perca fluviatilis

et al. 2005

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SynopsisWe examined behavioural interactions and feeding within triads of young-of-the-year (YOY) Eurasian perch, Perca fluviatilis, in aquaria with and without a shelter. For the first time we showed that competition for shelters, but not for food, provokes aggressiveness and triggers establishment of social hierarchy among young perch. No aggressiveness occurred during feeding bouts, when food was a limited resource. We expect the observed interactions to occur in natural heterogeneous habitats providing limited number of refuges and high local density of fish. They may ultimately lead to previously anticipated interference competition among juvenile perch.

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Section: Resultssupporting

confidence: 94%

Section: Introductionmentioning

confidence: 89%

Contestable shelters provoke aggression among 0+ perch, Perca fluviatilis

et al. 2005

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“…It is, for example, common that dominance structures develop given high enough levels of intraspeciWc competition (Whiteman and Cote 2004) which, in turn, can result in increased size variation as a result of dominant individuals obtaining a disproportionate share of the resources (Borowsky 1973;Grant 1993). It has, furthermore, been shown that food intake can also be highly variable among similarly sized individuals within groups of YOY perch (StaVan et al 2002). Given that young perch is a shoaling Wsh species when feeding on zooplankton (Craig 2000), individual diVerences in feeding rates not related to size-dependent exploitative interactions may also have contributed to observed diVerences in growth rates among individuals in our experiment.…”

Section: Discussionmentioning

confidence: 96%

Resource heterogeneity, diet shifts and intra-cohort competition: effects on size divergence in YOY fish

2008

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Most organisms exhibit a substantial size variation among individuals due to individual differences in experienced biotic and abiotic environmental conditions and because individuals undergo growth and development during most of their life time. One important issue in this context is how size variation within cohorts may develop over time. Here, we tested the hypothesis, in gape-limited animals such as fish, that size divergence among individuals within a cohort depends on the opportunity to undergo size-dependent diet shifts, by allowing initially larger individuals to make an early diet shift when the first resource becomes limiting. We used young-of-the-year perch (Perca fluviatilis) as our study organism. Competitive intensity and the opportunity to undergo a diet shift from zooplankton to macroinvertebrates affected both mean growth rates and the extent to which inter-individual variation in growth was manifested. As predicted, increased competition combined with the presence of both zooplankton and benthic macroinvertebrates increased the degree of size variation. However, size divergence was also observed among individuals when only the initial resource, zooplankton, was available. We argue that only non-exploitative interactions, such as dominance structures and social interactions, could have caused this latter pattern, as exploitative competition is expected to lead to size convergence due to the superior competitive ability of smaller individuals. Our results suggest that diet shifts are not a prerequisite for size divergence in animal cohorts, and that dominance and social interactions may have similar effects on size variation within cohorts. Finally, development of size variation is suggested to have strong implications for overall cohort performance.

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“…Aggression is also associated with social position or rank ( Mazur & Booth, 1998 ; Staffan, Magnhagen & Alanärä, 2002 ). For example, an albino female vampire bat Desmondus rotundus bred with pigmented individuals hold the lowest social position ( Uieda, 2001 ).…”

Section: Discussionmentioning

confidence: 99%

How does agonistic behaviour differ in albino and pigmented fish?

Slavík¹,

Horký²,

Wackermannová³

2016

PeerJ

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In addition to hypopigmentation of the skin and red iris colouration, albino animals also display distinct physiological and behavioural alterations. However, information on the social interactions of albino animals is rare and has mostly been limited to specially bred strains of albino rodents and animals from unique environments in caves. Differentiating between the effects of albinism and domestication on behaviour in rodents can be difficult, and social behaviour in cave fish changes according to species-specific adaptations to conditions of permanent darkness. The agonistic behaviours of albino offspring of pigmented parents have yet to be described. In this study, we observed agonistic behaviour in albino and pigmented juvenile Silurus glanis catfish. We found that the total number of aggressive interactions was lower in albinos than in pigmented catfish. The distance between conspecifics was also analysed, and albinos showed a tendency towards greater separation from their same-coloured conspecifics compared with pigmented catfish. These results demonstrate that albinism can be associated with lower aggressiveness and with reduced shoaling behaviour preference, as demonstrated by a tendency towards greater separation of albinos from conspecifics.

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Variation in food intake within groups of juvenile perch

Cited by 19 publications

References 15 publications

Contestable shelters provoke aggression among 0+ perch, Perca fluviatilis

Contestable shelters provoke aggression among 0+ perch, Perca fluviatilis

Resource heterogeneity, diet shifts and intra-cohort competition: effects on size divergence in YOY fish

How does agonistic behaviour differ in albino and pigmented fish?

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