Extraordinary AFLP fingerprint similarity despite strong assortative mating between reef fish color morphospecies

Felipe S. Barreto, Michael A McCartney

    Research output: Contribution to journalArticle

    33 Citations (Scopus)

    Abstract

    Recent theoretical models and empirical studies of fruit flies, birds, and fish indicate that assortative mating may initiate speciation when physical barriers to gene flow are absent, and before postzygotic barriers evolve. These are important results for marine animals like coral reef fish, where ocean currents can carry planktonic larvae over broad ranges, interconnecting populations and slowing genetic divergence. The Caribbean hamlets (genus Hypoplectrus) are a flock of reef fish morphospecies with highly distinct color pattern that mate like with like, but show little mitochondrial or microsatellite DNA differentiation. Here, we broadly screen genomic diversity using amplified fragment length polymorphisms (AFLP) and survey mating pair formation between two morphospecies in the Florida Keys, the butter hamlet (H. unicolor) and the blue hamlet (H. gemma). No AFLP was species-diagnostic (fixed), and neighbor-joining analyses revealed no clustering of individuals consistent with morphospecies boundaries. Assignment tests, however, placed most individuals within their morphospecies of origin. Field surveys showed that > 98% of mating pairs, including those of rare morphospecies, were of like color pattern. Spawning by a single mixed pair adds to earlier observations suggesting that infrequent hybridization may be a genetically homogenizing force in Hypoplectrus. This study provides a clear example of strong assortative mating in a system with limited genetic differentiation.

    Original languageEnglish (US)
    Pages (from-to)226-233
    Number of pages8
    JournalEvolution
    Volume62
    Issue number1
    DOIs
    StatePublished - Jan 1 2008

    Fingerprint

    assortative mating
    Dermatoglyphics
    amplified fragment length polymorphism
    reefs
    Fishes
    polymorphism
    reef
    Color
    color
    fish
    Coral Reefs
    Butter
    Architectural Accessibility
    Gene Flow
    Population Genetics
    genetic differentiation
    Oceans and Seas
    Diptera
    Microsatellite Repeats
    field survey

    Keywords

    • AFLP
    • Assortative mating
    • Color pattern
    • Coral reef fish
    • Hypoplectrus
    • Speciation
    • Species flock

    Cite this

    Extraordinary AFLP fingerprint similarity despite strong assortative mating between reef fish color morphospecies. / Barreto, Felipe S.; McCartney, Michael A.

    In: Evolution, Vol. 62, No. 1, 01.01.2008, p. 226-233.

    Research output: Contribution to journalArticle

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