Genetic assessment of connectivity in the common reef sponge, Callyspongia
vaginalis (Demospongiae: Haplosclerida) reveals high population structure along the Florida reef tract |
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Authors: | M B DeBiasse V P Richards M S Shivji |
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Institution: | (1) National Coral Reef Institute, Oceanographic Center, Nova Southeastern University, 8000 North Ocean Drive, Dania Beach, FL 33004, USA;(2) Present address: 107 Life Sciences Building, Louisiana State University, Baton Rouge, LA 70803, USA; |
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Abstract: | The genetic population structure of the common branching vase sponge, Callyspongia vaginalis, was determined along the entire length (465 km) of the Florida reef system from Palm Beach to the Dry Tortugas based on
sequences of the mitochondrial cytochrome c oxidase subunit 1 (COI) gene. Populations of C. vaginalis were highly structured (overall ΦST = 0.33), in some cases over distances as small as tens of kilometers. However, nonsignificant pairwise ΦST values were also found between a few relatively distant sampling sites suggesting that some long distance larval dispersal
may occur via ocean currents or transport in sponge fragments along continuous, shallow coastlines. Indeed, sufficient gene
flow appears to occur along the Florida reef tract to obscure a signal of isolation by distance, but not to homogenize COI
haplotype frequencies. The strong genetic differentiation among most of the sampling locations suggests that recruitment in
this species is largely local source-driven, pointing to the importance of further elucidating general connectivity patterns
along the Florida reef tract to guide the spatial scale of management efforts. |
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