The recruitment sweepstakes has many winners

Genetic evidence from the sea urchin Strongylocentrotus purpuratus

Jonathan Flowers, Stephen C. Schroeter, Ronald S. Burton

    Research output: Contribution to journalArticle

    Abstract

    As a consequence of free spawning in the unpredictable nearshore environment, marine species with large fecundities and high pre-reproductive mortality may be subject to extreme variance in reproductive success. If the unpredictability of the ocean results in only a small subset of the adult population contributing to each larval cohort, then reproduction may be viewed as a sweepstakes, with chance events determining which adults are successful each spawning season. Such a reproductive sweepstakes scenario may partially account for large reductions in effective population sizes relative to census population sizes in marine species. We evaluated two predictions of the sweepstakes reproductive success hypothesis by testing: (1) whether sea urchin recruits contain reduced genetic variation relative to the adult population; and (2) whether cohorts of sea urchin recruits are genetically differentiated. Mitochondrial DNA sequences were collected from 283 recently settled Strongylocentrotus purpuratus recruits from four annual cohorts spanning seven years in locations throughout California. Observed haplotype numbers and haplotype diversities showed little evidence of reduced genetic variation in the recruits relative to the diversity estimated from a previously reported sample of 145 S. purpuratus adults. Different cohorts of recruits were in some cases mildly differentiated from each other. A computer simulation of sweepstakes recruitment indicates that our sampling strategy had sufficient statistical power to detect large variances in reproductive success.

    Original languageEnglish (US)
    Pages (from-to)1445-1453
    Number of pages9
    JournalEvolution
    Volume56
    Issue number7
    DOIs
    StatePublished - Jan 1 2002

    Fingerprint

    Strongylocentrotus purpuratus
    Strongylocentrotus
    Sea Urchins
    Population Density
    Echinoidea
    Haplotypes
    reproductive success
    Censuses
    Mitochondrial DNA
    Oceans and Seas
    Computer Simulation
    Population
    Reproduction
    Fertility
    genetic variation
    haplotypes
    spawning
    population size
    nearshore environment
    Mortality

    Keywords

    • Bet hedging
    • Cytochrome oxidase I
    • Dispersal
    • Effective population size
    • Gene flow
    • Genetic drift
    • Reproductive success

    ASJC Scopus subject areas

    • Ecology, Evolution, Behavior and Systematics
    • Genetics
    • Agricultural and Biological Sciences(all)

    Cite this

    The recruitment sweepstakes has many winners : Genetic evidence from the sea urchin Strongylocentrotus purpuratus. / Flowers, Jonathan; Schroeter, Stephen C.; Burton, Ronald S.

    In: Evolution, Vol. 56, No. 7, 01.01.2002, p. 1445-1453.

    Research output: Contribution to journalArticle

    Flowers, Jonathan ; Schroeter, Stephen C. ; Burton, Ronald S. / The recruitment sweepstakes has many winners : Genetic evidence from the sea urchin Strongylocentrotus purpuratus. In: Evolution. 2002 ; Vol. 56, No. 7. pp. 1445-1453.
    @article{8c931bed36934ee9a07ff084aa1b58ec,
    title = "The recruitment sweepstakes has many winners: Genetic evidence from the sea urchin Strongylocentrotus purpuratus",
    abstract = "As a consequence of free spawning in the unpredictable nearshore environment, marine species with large fecundities and high pre-reproductive mortality may be subject to extreme variance in reproductive success. If the unpredictability of the ocean results in only a small subset of the adult population contributing to each larval cohort, then reproduction may be viewed as a sweepstakes, with chance events determining which adults are successful each spawning season. Such a reproductive sweepstakes scenario may partially account for large reductions in effective population sizes relative to census population sizes in marine species. We evaluated two predictions of the sweepstakes reproductive success hypothesis by testing: (1) whether sea urchin recruits contain reduced genetic variation relative to the adult population; and (2) whether cohorts of sea urchin recruits are genetically differentiated. Mitochondrial DNA sequences were collected from 283 recently settled Strongylocentrotus purpuratus recruits from four annual cohorts spanning seven years in locations throughout California. Observed haplotype numbers and haplotype diversities showed little evidence of reduced genetic variation in the recruits relative to the diversity estimated from a previously reported sample of 145 S. purpuratus adults. Different cohorts of recruits were in some cases mildly differentiated from each other. A computer simulation of sweepstakes recruitment indicates that our sampling strategy had sufficient statistical power to detect large variances in reproductive success.",
    keywords = "Bet hedging, Cytochrome oxidase I, Dispersal, Effective population size, Gene flow, Genetic drift, Reproductive success",
    author = "Jonathan Flowers and Schroeter, {Stephen C.} and Burton, {Ronald S.}",
    year = "2002",
    month = "1",
    day = "1",
    doi = "10.1111/j.0014-3820.2002.tb01456.x",
    language = "English (US)",
    volume = "56",
    pages = "1445--1453",
    journal = "Evolution; international journal of organic evolution",
    issn = "0014-3820",
    publisher = "Society for the Study of Evolution",
    number = "7",

    }

    TY - JOUR

    T1 - The recruitment sweepstakes has many winners

    T2 - Genetic evidence from the sea urchin Strongylocentrotus purpuratus

    AU - Flowers, Jonathan

    AU - Schroeter, Stephen C.

    AU - Burton, Ronald S.

    PY - 2002/1/1

    Y1 - 2002/1/1

    N2 - As a consequence of free spawning in the unpredictable nearshore environment, marine species with large fecundities and high pre-reproductive mortality may be subject to extreme variance in reproductive success. If the unpredictability of the ocean results in only a small subset of the adult population contributing to each larval cohort, then reproduction may be viewed as a sweepstakes, with chance events determining which adults are successful each spawning season. Such a reproductive sweepstakes scenario may partially account for large reductions in effective population sizes relative to census population sizes in marine species. We evaluated two predictions of the sweepstakes reproductive success hypothesis by testing: (1) whether sea urchin recruits contain reduced genetic variation relative to the adult population; and (2) whether cohorts of sea urchin recruits are genetically differentiated. Mitochondrial DNA sequences were collected from 283 recently settled Strongylocentrotus purpuratus recruits from four annual cohorts spanning seven years in locations throughout California. Observed haplotype numbers and haplotype diversities showed little evidence of reduced genetic variation in the recruits relative to the diversity estimated from a previously reported sample of 145 S. purpuratus adults. Different cohorts of recruits were in some cases mildly differentiated from each other. A computer simulation of sweepstakes recruitment indicates that our sampling strategy had sufficient statistical power to detect large variances in reproductive success.

    AB - As a consequence of free spawning in the unpredictable nearshore environment, marine species with large fecundities and high pre-reproductive mortality may be subject to extreme variance in reproductive success. If the unpredictability of the ocean results in only a small subset of the adult population contributing to each larval cohort, then reproduction may be viewed as a sweepstakes, with chance events determining which adults are successful each spawning season. Such a reproductive sweepstakes scenario may partially account for large reductions in effective population sizes relative to census population sizes in marine species. We evaluated two predictions of the sweepstakes reproductive success hypothesis by testing: (1) whether sea urchin recruits contain reduced genetic variation relative to the adult population; and (2) whether cohorts of sea urchin recruits are genetically differentiated. Mitochondrial DNA sequences were collected from 283 recently settled Strongylocentrotus purpuratus recruits from four annual cohorts spanning seven years in locations throughout California. Observed haplotype numbers and haplotype diversities showed little evidence of reduced genetic variation in the recruits relative to the diversity estimated from a previously reported sample of 145 S. purpuratus adults. Different cohorts of recruits were in some cases mildly differentiated from each other. A computer simulation of sweepstakes recruitment indicates that our sampling strategy had sufficient statistical power to detect large variances in reproductive success.

    KW - Bet hedging

    KW - Cytochrome oxidase I

    KW - Dispersal

    KW - Effective population size

    KW - Gene flow

    KW - Genetic drift

    KW - Reproductive success

    UR - http://www.scopus.com/inward/record.url?scp=0036344457&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=0036344457&partnerID=8YFLogxK

    U2 - 10.1111/j.0014-3820.2002.tb01456.x

    DO - 10.1111/j.0014-3820.2002.tb01456.x

    M3 - Article

    VL - 56

    SP - 1445

    EP - 1453

    JO - Evolution; international journal of organic evolution

    JF - Evolution; international journal of organic evolution

    SN - 0014-3820

    IS - 7

    ER -