Population Genetics, Dispersal, and Kinship Among Wild Squirrel Monkeys (Saimiri sciureus macrodon)

Preferential Association Between Closely Related Females and Its Implications for Insect Prey Capture Success

Michael J. Montague, Todd Disotell, Anthony Di Fiore

    Research output: Contribution to journalArticle

    Abstract

    Little genetic information is available to evaluate hypotheses concerning the parameters that affect population genetic structure in primate taxa that exhibit interspecific variation in social systems, such as squirrel monkeys (Saimiri). Here, we used genetic data to assess dispersal patterns, kin structure, and preferential association with same-sex kin in a wild population of Saimiri sciureus macrodon. We also analyzed behavioral data to assess whether individuals that maintain shorter interindividual distances show increased insect foraging success. If there was greater male than female dispersal, then we expected mean pairwise relatedness, F ST values, and intragroup mean corrected assignment indices to be greater among adult females than among adult males. We also expected matrices of pairwise affinity indices (PAIs) for "association" (time spent ≤5 m) and "proximity" (time spent ≤10 m) among female dyads to positively correlate with a matrix of female pairwise relatedness. Not only did we find support for female philopatry, but we also found significant positive relationships between the relatedness matrix and each of the PAI matrices: females were more likely to be associated with (and proximal to) close female relatives than more distant relatives or unrelated individuals. Foraging analyses revealed that females had higher insect capture rates than males, and this sex difference may be related to a smaller mean interindividual distance among closely related female group members. Our result shows how estimates of genetic relatedness are useful for testing predictions regarding the evolution of sex-biased dispersal patterns, as well as potential relationships between kin-biased social behaviors and foraging success.

    Original languageEnglish (US)
    Pages (from-to)169-187
    Number of pages19
    JournalInternational Journal of Primatology
    Volume35
    Issue number1
    DOIs
    StatePublished - Feb 2014

    Fingerprint

    Saimiri sciureus
    Saimiri
    prey capture
    kinship
    population genetics
    insect
    insects
    relatedness
    matrix
    foraging
    Macrodon
    philopatry
    interspecific variation
    gender
    social behavior
    wild population
    gender differences
    primate
    genetic structure
    genetic relationships

    Keywords

    • Dispersal
    • Insect foraging
    • Population genetics
    • Saimiri
    • Squirrel monkeys

    ASJC Scopus subject areas

    • Ecology, Evolution, Behavior and Systematics
    • Animal Science and Zoology

    Cite this

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    title = "Population Genetics, Dispersal, and Kinship Among Wild Squirrel Monkeys (Saimiri sciureus macrodon): Preferential Association Between Closely Related Females and Its Implications for Insect Prey Capture Success",
    abstract = "Little genetic information is available to evaluate hypotheses concerning the parameters that affect population genetic structure in primate taxa that exhibit interspecific variation in social systems, such as squirrel monkeys (Saimiri). Here, we used genetic data to assess dispersal patterns, kin structure, and preferential association with same-sex kin in a wild population of Saimiri sciureus macrodon. We also analyzed behavioral data to assess whether individuals that maintain shorter interindividual distances show increased insect foraging success. If there was greater male than female dispersal, then we expected mean pairwise relatedness, F ST values, and intragroup mean corrected assignment indices to be greater among adult females than among adult males. We also expected matrices of pairwise affinity indices (PAIs) for {"}association{"} (time spent ≤5 m) and {"}proximity{"} (time spent ≤10 m) among female dyads to positively correlate with a matrix of female pairwise relatedness. Not only did we find support for female philopatry, but we also found significant positive relationships between the relatedness matrix and each of the PAI matrices: females were more likely to be associated with (and proximal to) close female relatives than more distant relatives or unrelated individuals. Foraging analyses revealed that females had higher insect capture rates than males, and this sex difference may be related to a smaller mean interindividual distance among closely related female group members. Our result shows how estimates of genetic relatedness are useful for testing predictions regarding the evolution of sex-biased dispersal patterns, as well as potential relationships between kin-biased social behaviors and foraging success.",
    keywords = "Dispersal, Insect foraging, Population genetics, Saimiri, Squirrel monkeys",
    author = "Montague, {Michael J.} and Todd Disotell and {Di Fiore}, Anthony",
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    T1 - Population Genetics, Dispersal, and Kinship Among Wild Squirrel Monkeys (Saimiri sciureus macrodon)

    T2 - Preferential Association Between Closely Related Females and Its Implications for Insect Prey Capture Success

    AU - Montague, Michael J.

    AU - Disotell, Todd

    AU - Di Fiore, Anthony

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    N2 - Little genetic information is available to evaluate hypotheses concerning the parameters that affect population genetic structure in primate taxa that exhibit interspecific variation in social systems, such as squirrel monkeys (Saimiri). Here, we used genetic data to assess dispersal patterns, kin structure, and preferential association with same-sex kin in a wild population of Saimiri sciureus macrodon. We also analyzed behavioral data to assess whether individuals that maintain shorter interindividual distances show increased insect foraging success. If there was greater male than female dispersal, then we expected mean pairwise relatedness, F ST values, and intragroup mean corrected assignment indices to be greater among adult females than among adult males. We also expected matrices of pairwise affinity indices (PAIs) for "association" (time spent ≤5 m) and "proximity" (time spent ≤10 m) among female dyads to positively correlate with a matrix of female pairwise relatedness. Not only did we find support for female philopatry, but we also found significant positive relationships between the relatedness matrix and each of the PAI matrices: females were more likely to be associated with (and proximal to) close female relatives than more distant relatives or unrelated individuals. Foraging analyses revealed that females had higher insect capture rates than males, and this sex difference may be related to a smaller mean interindividual distance among closely related female group members. Our result shows how estimates of genetic relatedness are useful for testing predictions regarding the evolution of sex-biased dispersal patterns, as well as potential relationships between kin-biased social behaviors and foraging success.

    AB - Little genetic information is available to evaluate hypotheses concerning the parameters that affect population genetic structure in primate taxa that exhibit interspecific variation in social systems, such as squirrel monkeys (Saimiri). Here, we used genetic data to assess dispersal patterns, kin structure, and preferential association with same-sex kin in a wild population of Saimiri sciureus macrodon. We also analyzed behavioral data to assess whether individuals that maintain shorter interindividual distances show increased insect foraging success. If there was greater male than female dispersal, then we expected mean pairwise relatedness, F ST values, and intragroup mean corrected assignment indices to be greater among adult females than among adult males. We also expected matrices of pairwise affinity indices (PAIs) for "association" (time spent ≤5 m) and "proximity" (time spent ≤10 m) among female dyads to positively correlate with a matrix of female pairwise relatedness. Not only did we find support for female philopatry, but we also found significant positive relationships between the relatedness matrix and each of the PAI matrices: females were more likely to be associated with (and proximal to) close female relatives than more distant relatives or unrelated individuals. Foraging analyses revealed that females had higher insect capture rates than males, and this sex difference may be related to a smaller mean interindividual distance among closely related female group members. Our result shows how estimates of genetic relatedness are useful for testing predictions regarding the evolution of sex-biased dispersal patterns, as well as potential relationships between kin-biased social behaviors and foraging success.

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