An integrated approach to life-cycle evolution using selective landscapes

Richard Sibly, Peter Calow

    Research output: Contribution to journalArticle

    101 Citations (Scopus)

    Abstract

    A model which defines fitness in terms of the intrinsic rate of increase of phenotypes is used to analyse which life cycles are appropriate to which ecological circumstances. The following predictions are made for asexual animals and those sexual animals producing on average more than one daughter per brood. If there are no behavioural or physiological interactions between variables, then number of offspring per breeding should be maximized, survival until first/next breeding should be maximized, and time to first/next breeding should be minimized. If interactions occur such that altering one life-cycle variable affects another, then there are trade-offs between variables and the optimum trade-off will maximize fitness. Number of offspring per breeding will generally affect adult survivorship until next breeding. Given certain reasonable assumptions about this trade-off, high juvenile survivorship selects towards semelparity (many offspring per brood), low juvenile survivorship selects towards iteroparity (few offspring per brood). If juvenile survival depends on adult feeding, as in altricial birds, then juvenile survivorship declines as clutch size is increased. Optimal clutch size maximizes the number of surviving offspring per brood. Two trade-offs involve parental care. If parents guard their offspring they should take more risks if brood size is larger. The amount that parents feed their offspring should depend on how effective feeding is in enhancing growth. Growth may also be enhanced by taking risks, in juveniles or adults. The extent of risk-taking should depend on how effective risk-taking is in enhancing growth. If the number of offspring per brood is related to growing conditions for offspring, the prediction is that more offspring per brood should be produced if growing conditions for offspring are better. If the adult can protect the offspring, for example by encapsulating them, the amount of protection provided should depend on how effective the protection is in increasing offspring survivorship.

    Original languageEnglish (US)
    Pages (from-to)527-547
    Number of pages21
    JournalJournal of Theoretical Biology
    Volume102
    Issue number4
    DOIs
    StatePublished - Jun 21 1983

    Fingerprint

    Life Cycle Stages
    Life Cycle
    Breeding
    Life cycle
    life cycle (organisms)
    Trade-offs
    survival rate
    Risk-Taking
    Clutch Size
    Clutches
    breeding
    Fitness
    Animals
    clutch size
    Maximise
    Growth
    Prediction
    Birds
    Interaction
    Phenotype

    Cite this

    An integrated approach to life-cycle evolution using selective landscapes. / Sibly, Richard; Calow, Peter.

    In: Journal of Theoretical Biology, Vol. 102, No. 4, 21.06.1983, p. 527-547.

    Research output: Contribution to journalArticle

    @article{90048a60c63c4898abc75cbde9851dd4,
    title = "An integrated approach to life-cycle evolution using selective landscapes",
    abstract = "A model which defines fitness in terms of the intrinsic rate of increase of phenotypes is used to analyse which life cycles are appropriate to which ecological circumstances. The following predictions are made for asexual animals and those sexual animals producing on average more than one daughter per brood. If there are no behavioural or physiological interactions between variables, then number of offspring per breeding should be maximized, survival until first/next breeding should be maximized, and time to first/next breeding should be minimized. If interactions occur such that altering one life-cycle variable affects another, then there are trade-offs between variables and the optimum trade-off will maximize fitness. Number of offspring per breeding will generally affect adult survivorship until next breeding. Given certain reasonable assumptions about this trade-off, high juvenile survivorship selects towards semelparity (many offspring per brood), low juvenile survivorship selects towards iteroparity (few offspring per brood). If juvenile survival depends on adult feeding, as in altricial birds, then juvenile survivorship declines as clutch size is increased. Optimal clutch size maximizes the number of surviving offspring per brood. Two trade-offs involve parental care. If parents guard their offspring they should take more risks if brood size is larger. The amount that parents feed their offspring should depend on how effective feeding is in enhancing growth. Growth may also be enhanced by taking risks, in juveniles or adults. The extent of risk-taking should depend on how effective risk-taking is in enhancing growth. If the number of offspring per brood is related to growing conditions for offspring, the prediction is that more offspring per brood should be produced if growing conditions for offspring are better. If the adult can protect the offspring, for example by encapsulating them, the amount of protection provided should depend on how effective the protection is in increasing offspring survivorship.",
    author = "Richard Sibly and Peter Calow",
    year = "1983",
    month = "6",
    day = "21",
    doi = "10.1016/0022-5193(83)90389-2",
    language = "English (US)",
    volume = "102",
    pages = "527--547",
    journal = "Journal of Theoretical Biology",
    issn = "0022-5193",
    publisher = "Academic Press Inc.",
    number = "4",

    }

    TY - JOUR

    T1 - An integrated approach to life-cycle evolution using selective landscapes

    AU - Sibly, Richard

    AU - Calow, Peter

    PY - 1983/6/21

    Y1 - 1983/6/21

    N2 - A model which defines fitness in terms of the intrinsic rate of increase of phenotypes is used to analyse which life cycles are appropriate to which ecological circumstances. The following predictions are made for asexual animals and those sexual animals producing on average more than one daughter per brood. If there are no behavioural or physiological interactions between variables, then number of offspring per breeding should be maximized, survival until first/next breeding should be maximized, and time to first/next breeding should be minimized. If interactions occur such that altering one life-cycle variable affects another, then there are trade-offs between variables and the optimum trade-off will maximize fitness. Number of offspring per breeding will generally affect adult survivorship until next breeding. Given certain reasonable assumptions about this trade-off, high juvenile survivorship selects towards semelparity (many offspring per brood), low juvenile survivorship selects towards iteroparity (few offspring per brood). If juvenile survival depends on adult feeding, as in altricial birds, then juvenile survivorship declines as clutch size is increased. Optimal clutch size maximizes the number of surviving offspring per brood. Two trade-offs involve parental care. If parents guard their offspring they should take more risks if brood size is larger. The amount that parents feed their offspring should depend on how effective feeding is in enhancing growth. Growth may also be enhanced by taking risks, in juveniles or adults. The extent of risk-taking should depend on how effective risk-taking is in enhancing growth. If the number of offspring per brood is related to growing conditions for offspring, the prediction is that more offspring per brood should be produced if growing conditions for offspring are better. If the adult can protect the offspring, for example by encapsulating them, the amount of protection provided should depend on how effective the protection is in increasing offspring survivorship.

    AB - A model which defines fitness in terms of the intrinsic rate of increase of phenotypes is used to analyse which life cycles are appropriate to which ecological circumstances. The following predictions are made for asexual animals and those sexual animals producing on average more than one daughter per brood. If there are no behavioural or physiological interactions between variables, then number of offspring per breeding should be maximized, survival until first/next breeding should be maximized, and time to first/next breeding should be minimized. If interactions occur such that altering one life-cycle variable affects another, then there are trade-offs between variables and the optimum trade-off will maximize fitness. Number of offspring per breeding will generally affect adult survivorship until next breeding. Given certain reasonable assumptions about this trade-off, high juvenile survivorship selects towards semelparity (many offspring per brood), low juvenile survivorship selects towards iteroparity (few offspring per brood). If juvenile survival depends on adult feeding, as in altricial birds, then juvenile survivorship declines as clutch size is increased. Optimal clutch size maximizes the number of surviving offspring per brood. Two trade-offs involve parental care. If parents guard their offspring they should take more risks if brood size is larger. The amount that parents feed their offspring should depend on how effective feeding is in enhancing growth. Growth may also be enhanced by taking risks, in juveniles or adults. The extent of risk-taking should depend on how effective risk-taking is in enhancing growth. If the number of offspring per brood is related to growing conditions for offspring, the prediction is that more offspring per brood should be produced if growing conditions for offspring are better. If the adult can protect the offspring, for example by encapsulating them, the amount of protection provided should depend on how effective the protection is in increasing offspring survivorship.

    UR - http://www.scopus.com/inward/record.url?scp=0001698547&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=0001698547&partnerID=8YFLogxK

    U2 - 10.1016/0022-5193(83)90389-2

    DO - 10.1016/0022-5193(83)90389-2

    M3 - Article

    VL - 102

    SP - 527

    EP - 547

    JO - Journal of Theoretical Biology

    JF - Journal of Theoretical Biology

    SN - 0022-5193

    IS - 4

    ER -