Limited capacity for developmental thermal acclimation in three tropical wrasses

Motson, K., and Donelson, J.M. (2017) Limited capacity for developmental thermal acclimation in three tropical wrasses. Coral Reefs, 36 (2). pp. 609-621.

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Abstract

For effective conservation and management of marine systems it is essential that we understand the biological impacts of and capacity for acclimation to increased ocean temperatures. This study investigated for the first time, the effects of developing in projected warmer ocean conditions in the tropical wrasse species: Halichoeres melanurus, Halichoeres miniatus and Thalassoma amblycephalum. New recruits were reared for 11 weeks in control (29 °C) and +2 °C (31 °C) temperature treatments, consistent with predicted increases in sea surface temperature for the end of the century. A broad range of key attributes and performance parameters were tested, including aerobic metabolism, swimming ability, burst escape performance and physical condition. Response latency of burst performance was the only performance parameter in which evidence of beneficial thermal developmental acclimation was found, observed only in H. melanurus. Generally, development in the +2 °C treatment came at a significant cost to all species, resulting in reduced growth, condition and reduced metabolic and swimming performance relative to controls. Development in +2 °C conditions exacerbated the effects of warming on aerobic metabolism and swimming ability, compared to short-term warming effects. Burst escape performance parameters were only mildly affected by development in the warmer treatment, with non-locomotor performance (response latency) showing a greater thermal sensitivity than locomotor performance parameters. Overall these results indicate that the effects of future climate change to tropical wrasses would be underestimated with short-term testing. This study highlights the importance of holistic, longer-term developmental experimental approaches, with warming found to yield significant, species-specific responses in all parameters tested.

Item ID: 46549
Item Type: Article (Research - C1)
ISSN: 1432-0975
Funders: Ian Potter Foundation, University of Technology, Sydney
Research Data: http://dx.doi.org/10.4225/28/586c8ca7f09a5
Date Deposited: 05 Dec 2016 02:00
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 50%
05 ENVIRONMENTAL SCIENCES > 0501 Ecological Applications > 050101 Ecological Impacts of Climate Change @ 50%
SEO Codes: 96 ENVIRONMENT > 9603 Climate and Climate Change > 960305 Ecosystem Adaptation to Climate Change @ 50%
96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 50%
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