Local retention,dispersal and fluctuating connectivity among populations of a coral reef fish |
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Authors: | J Derek Hogan Roger J Thiessen Peter F Sale Daniel D Heath |
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Institution: | (1) Great Lakes Institute for Environmental Research, University of Windsor, 401 Sunset Ave., Windsor, ON, N9C 3P4, Canada;(2) Institute for Water, Environment and Health, United Nations University, Hamilton, ON, L8P 0A1, Canada;(3) Present address: Center for Limnology, University of Wisconsin–Madison, 680 North Park St., Madison, WI 53706, USA |
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Abstract: | The persistence and resilience of marine populations in the face of disturbances is directly affected by connectivity among
populations. Thus, understanding the magnitude and pattern of connections among populations and the temporal variation in
these patterns is critical for the effective management and conservation of marine species. Despite recent advances in our
understanding of marine connectivity, few empirical studies have directly measured the magnitude or pattern of connections
among populations of marine fishes, and none have explicitly investigated temporal variation in demographic connectivity.
We use genetic assignment tests to track the dispersal of 456 individual larval fishes to quantify the extent of connectivity,
dispersal, self-recruitment and local retention within and among seven populations of a coral reef fish (Stegastes partitus) over a three-year period. We found that some larvae do disperse long distances (~200 km); however, self-recruitment was
a regular phenomenon. Importantly, we found that dispersal distances, self-recruitment, local retention and the pattern of
connectivity varied significantly among years. Our data highlight the unpredictable nature of connectivity, and underscore
the need for more, temporally replicated, empirical measures of connectivity to inform management decisions. |
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