Reef waters stimulate substratum exploration in planulae from brooding Caribbean corals |
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Authors: | D F Gleason B S Danilowicz and C J Nolan |
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Institution: | (1) Department of Biology, Georgia Southern University, P.O. Box 8042, Statesboro, GA 30460-8042, USA;(2) School of Biology and Environmental Science, University College Dublin, Belfield, Dublin 4, Ireland |
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Abstract: | This study tested the hypothesis that waters surrounding reefs with healthy coral populations are more likely than degraded
sites to induce planulae to navigate downward and begin benthic probing. In the laboratory, larvae from two brooding Caribbean
coral species, Agaricia tenuifolia and Porites astreoides, were introduced to seawater collected at (1) 1 m above shallow, healthy reef with high-coral cover, (2) 1 m above shallow,
degraded reef with high-macroalgal cover, and (3) ~400 m ocean-ward of the reef in deep, blue water. Counter to the hypothesis,
water from both the healthy and degraded reef caused the larvae to swim downward and begin benthic probing. These results
suggest that substances carried in reef waters may contribute to macro-scale habitat selection by planulae and that understanding
how these waterborne cues mesh with other stimuli used by planulae to select a settlement site may be valuable for deciphering
a site’s recruitment potential for corals. |
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Keywords: | Settlement Chemical cues Coral larvae Caribbean Porites astreoides Agaricia tenuifolia |
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