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Convergence Of Life History Phenotypes In A Trinidadian Killifish (Rivulus hartii)

Home Forums Ichthyology Convergence Of Life History Phenotypes In A Trinidadian Killifish (Rivulus hartii)

This topic contains 0 replies, has 1 voice, and was last updated by  Colin 6 years, 10 months ago.

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  • #301868

    Matt
    Keymaster

    Abstract

    Convergent evolution is characterized by the independent evolution of similar phenotypes within similar selective environments. Previous work on Trinidadian killifish, Rivulus hartii, demonstrated repeatable life-history differences across communities that differ in predation intensity. These studies were performed in rivers located on the south slope of Trinidad’s Northern Range Mountains. There exists a parallel series of rivers on the north slope of these mountains. As on the south slope, Rivulus is found across a gradient of fish predation. However, the predatory fish species in north-slope rivers are derived from marine families, whereas south-slope rivers contain a predatory fish fauna characteristic of the South American mainland. If predator-induced mortality and the associated indirect effects are the causal factors selecting for life-history patterns in Rivulus, and these are similar in north and south-slope rivers, then the specific predatory species should be interchangeable and we would expect convergence of life history phenotypes across slopes. Here, we characterize the life-history phenotypes of Rivulus from north-slope communities by measuring number of eggs, egg weight, reproductive allotment, reproductive tissue weight, and size at maturity. We find similar patterns of life-history divergence across analogous predator communities. Between slopes, minor differences in Rivulus life-history traits exist and one potential cause of these differences is the abundance of Macrobrachium prawns in north-slope rivers.

    #346193

    Colin
    Participant

    cool, let me know if you have that one in full… i have a similar paper from glasgow uni – think i might have sent you that before though?

    PS have about twenty R hartii now at about 30mm

    #346206

    Matt
    Keymaster

    Sent.

    #346249

    Colin
    Participant

    got – thanks

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