Kin discrimination in salmonids

Brown, G. E.; Brown, Joseph A.

doi:10.1007/bf00182343

Cited by 79 publications

(62 citation statements)

References 74 publications

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“…The olfactory systems of many ¢sh allow the detection of kin through cues present in secreted bile acids, amino acids and urine (e.g. McKaye & Barlow 1976;Loiselle 1983;Quinn & Busack 1985;Brown & Brown 1996). Thus, a parental male bluegill sun¢sh may be able to assess his paternity from the odour in the secretions of the newly hatched fry (e.g.…”

Section: Discussionmentioning

confidence: 99%

Dynamic adjustment of parental care in response to perceived paternity

Neff

Gross

2001

Proc. R. Soc. Lond. B

101

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Theories of parental care evolution predict that genetic relatedness will be an important variable in the amount of care a parent provides. However, current inferences of relatedness-based parental investment from studies in humans and birds remain challenged. No study has yet demonstrated parental care adjustment in a manner uncomplicated by life-history correlates or experimental design. We now present a unique test that controls for individual life histories and demonstrates paternity-related dynamic adjustments in parental care. Brood-rearing male bluegill sun¢sh (Lepomis macrochirus) that are cuckolded to a varying degree will either increase or decrease their parental investment in response to changing information on paternity during brood development. Speci¢cally, as parental males detect paternity lost to cuckolders and, hence, a reduction in the value of their brood, they adaptively lower their level of parental care. Conversely, if they detect that their paternity is higher than previously assessed, they adaptively raise their level of parental care. This dynamic adjustment during brood rearing indicates the importance of genetic relatedness in parental investment decisions and provides needed empirical support for theoretical predictions.

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Section: Discussionmentioning

confidence: 99%

Dynamic adjustment of parental care in response to perceived paternity

Neff

Gross

2001

Proc. R. Soc. Lond. B

101

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“…15). For example, both Atlantic and coho salmon can discriminate between siblings and nonsiblings (21,22).…”

Section: Discussionmentioning

confidence: 99%

“…Recent molecular paternity analyses indicate that the nests of many fish species commonly contain embryos that are unrelated to the guardian male, because of instances of egg thievery, nest takeovers, and stolen fertilizations (cuckoldry) via sneaker or other males (12,13). In addition, there is considerable evidence that at least some fish species (and many other organisms) are capable of finely discriminating kin from nonkin under certain circumstances (14)(15)(16)(17). Thus, it is possible that parental males who cannibalize embryos from their own nests might merely be eating embryos that they themselves had not sired!…”

mentioning

confidence: 99%

Genetic documentation of filial cannibalism in nature

DeWoody

Fletcher

Wilkins

et al. 2001

Proc. Natl. Acad. Sci. U.S.A.

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Cannibalism is widespread in natural populations of fishes, where the stomachs of adults frequently contain conspecific juveniles. Furthermore, field observations suggest that guardian males routinely eat offspring from their own nests. However, recent genetic paternity analyses have shown that fish nests often contain embryos not sired by the nest-tending male (because of cuckoldry events, egg thievery, or nest piracy). Such findings, coupled with the fact that several fish species have known capabilities for distinguishing kin from nonkin, raise the possibility that cannibalism by guardian males is directed primarily or exclusively toward unrelated embryos in their nests. Here, we test this hypothesis by collecting freshly cannibalized embryos from the stomachs of several nest-tending darter and sunfish males in nature and determining their genetic parentage by using polymorphic microsatellite markers. Our molecular results clearly indicate that guardian males do indeed consume their own genetic offspring, even when unrelated (foster) embryos are present within the nest. These data provide genetic documentation of filial cannibalism in nature. Furthermore, they suggest that the phenomenon may result, at least in part, from an inability of guardians to differentiate between kin and nonkin within their own nests.

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“…Alternatively, kin-selected benefits may be responsible for kin-biased distribution. These benefits could consist of reduced aggressiveness towards related individuals and smaller territory sizes (reviews by Brown and Brown, 1996;Olsén, 1999) as well as increased feeding opportunities for subordinates when in close proximity with dominant kin (Griffiths and Armstrong, 2002). Hamilton (1964) suggested that kin-biased behaviours could evolve if the dispersal of relatives was predictable in space and time.…”

Section: Mechanisms For Nonrandom Distributionmentioning

confidence: 99%

“…These properties have made salmonids suitable for studies of kin recognition and kin-biased behaviour. Evidence of kin-biased aggressive behaviour and preference for water scented by siblings has been demonstrated in artificially bred sibling groups of juvenile Atlantic salmon S. salar (L.), Arctic charr Salvelinus alpinus (L.), brown trout and rainbow trout Oncorhynchus mykiss (Waldbaum), both under laboratory and seminatural conditions (reviews by Brown and Brown, 1996;Olsén, 1999). There is, however, less knowledge concerning the degree to which these salmonids also associate with related conspecifics in wild populations under natural conditions.…”

Section: Introductionmentioning

confidence: 99%

Kin-biased distribution in brown trout: an effect of redd location or kin recognition?

Carlsson

Olsén

Hansen³

et al. 2003

Heredity

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A wide range of animals have been reported to show kinbiased behaviours, such as reduced aggressiveness and increased food sharing among relatives. However, less is known about whether wild animals also associate with relatives under natural conditions, which is a prerequisite to facilitate kin-biased behaviours and hence kin selection. We tested, by means of microsatellite polymorphism, correlations between pair-wise relatedness and pair-wise metric distance in wild brown trout (Salmo trutta L.) under natural conditions in two streams. Our data show that young-of-theyear as well as older trout found close together also had a higher genetic relatedness in one of the two streams, whereas no relationship was found in the other stream. Very few half and full siblings were found in the second stream and under these conditions it is unlikely that kin-biased behaviours will receive positive selection. We discuss the underlying mechanisms for the observed structure and we specifically address the issue of whether the grouping of related individuals could reflect dispersal from the same spawning redds, or if it reflects active association with relatives, possibly conferring kin-selected advantages.

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Kin discrimination in salmonids

Cited by 79 publications

References 74 publications

Dynamic adjustment of parental care in response to perceived paternity

Dynamic adjustment of parental care in response to perceived paternity

Genetic documentation of filial cannibalism in nature

Kin-biased distribution in brown trout: an effect of redd location or kin recognition?

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