The effect of temperature on larval pre-settlement duration and metamorphosis for the sponge, Rhopaloeides odorabile
- 285 Downloads
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.
KeywordsSessile marine invertebrates Larval settlement Thermal-tolerance Thermal-stress Climate Sponge
We thank D. Cocker and A. M. Lynch for assisting in sample collections and laboratory work.
- Bassim KM, Sammarco PW (2003) Effects of temperature and ammonium on larval development and survivorship in a scleractinian coral (Diploria strigosa). Mar Biol 142:241–252Google Scholar
- Cossins AR, Bowler K (1987) Temperature biology of animals. Chapman and Hall, LondonGoogle Scholar
- Lough J (2007) Climate change on the Great Barrier Reef. In: Johnson JE, Marshall PA (eds) Climate change in the Great Barrier Reef. Great Barrier Reef Marine Park Authority and Australian Greenhouse Office, Townsville, pp 15–50Google Scholar
- Rumrill S (1990) Natural mortality of marine invertebrate larvae. Ophelia 32:163–198Google Scholar
- Whalan S (2007) Reproduction, larval dispersal and population genetics of the sponge Rhopaloeides odorabile. Ph.D. Thesis, James Cook University, p 144Google Scholar