Effects of exposure duration on the response of Pocillopora damicornis larvae to elevated temperature and high pCO₂

Cumbo, Vivian, Fan, T.Y., and Edmunds, P.J. (2013) Effects of exposure duration on the response of Pocillopora damicornis larvae to elevated temperature and high pCO₂. Journal of Experimental Marine Biology and Ecology, 439. pp. 100-107.

[img] PDF (Published Version)
Restricted to Repository staff only

View at Publisher Website: http://dx.doi.org/10.1016/j.jembe.2012.1...
 
28
2


Abstract

Efforts to evaluate the response of coral larvae to global climate change (GCC) and ocean acidification (OA) typically employ short experiments of fixed length, yet it is unknown how the response is affected by exposure duration. In this study, we exposed larvae from the brooding coral Pocillopora damicornis to contrasts of temperature (24.00 °C [ambient] versus 30.49 °C) and pCO₂ (49.4 Pa versus 86.2 Pa) for varying periods (1–5 days) to test the hypothesis that exposure duration had no effect on larval response as assessed by protein content, respiration, Symbiodinium density, and survivorship; exposure times were ecologically relevant compared to representative pelagic larval durations (PLD) for corals. Larvae differed among days for all response variables, and the effects of the treatment were relatively consistent regardless of exposure duration for three of the four response variables. Protein content and Symbiodinium density were unaffected by temperature and pCO₂, but respiration increased with temperature (but not pCO₂) with the effect intensifying as incubations lengthened. Survival, however, differed significantly among treatments at the end of the study, and by the 5th day, 78% of the larvae were alive and swimming under ambient temperature and ambient pCO₂, but only 55–59% were alive in the other treatments. These results demonstrate that the physiological effects of temperature and pCO₂ on coral larvae can reliably be detected within days, but effects on survival require ≥ 5 days to detect. The detection of time-dependent effects on larval survivorship suggests that the influence of GCC and OA will be stronger for corals having long PLDs.

Item ID: 32150
Item Type: Article (Research - C1)
ISSN: 0022-0981
Funders: National Science Foundation (USA)
Projects and Grants: NSF BIO-OCE 08-44785
Date Deposited: 29 May 2014 04:26
FoR Codes: 06 BIOLOGICAL SCIENCES > 0606 Physiology > 060604 Comparative Physiology @ 50%
06 BIOLOGICAL SCIENCES > 0699 Other Biological Sciences > 069902 Global Change Biology @ 50%
SEO Codes: 96 ENVIRONMENT > 9603 Climate and Climate Change > 960301 Climate Change Adaptation Measures @ 50%
96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 50%
Downloads: Total: 2
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page