The effect of temperature on larval pre-settlement duration and metamorphosis for the sponge, <Emphasis Type="Italic">Rhopaloeides odorabile</Emphasis> |
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Authors: | S Whalan P Ettinger-Epstein R de Nys |
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Institution: | (1) School of Marine & Tropical Biology, James Cook University, Townsville, Qld, 4811, Australia;(2) AIMS@JCU Tropical Aquaculture, James Cook University, Townsville, Qld, 4811, Australia |
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Abstract: | Rising sea temperatures may potentially affect the dispersive larval phase of sessile marine invertebrates with consequences
for the viability of adult populations. This study demonstrated that the planktonic larvae of Rhopaloeides odorabile, a common Great Barrier Reef sponge, survived and metamorphosed when exposed to temperatures up to 9°C above the annual maximum
(~29°C). Planktonic larval duration of 54 h, at ambient temperatures (~28°C), were reduced to 18 h for larvae exposed to elevated
temperatures (32–36°C). Moreover, at ambient temperatures larvae began metamorphosing after 12 h, but at 32–36°C this reduced
to only 2 h. Larvae survived and could still metamorphose at temperatures as high as 38°C, but were no longer functional at
40°C. These results imply that predicted increases in sea surface temperature may reduce planktonic larval duration and dispersal
capabilities, thereby contributing to population subdivision of the species. |
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Keywords: | Sessile marine invertebrates Larval settlement Thermal-tolerance Thermal-stress Climate Sponge |
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