Increased CO₂ stimulates reproduction in a coral reef fish

Miller, Gabrielle M., Watson, Sue-Ann, McCormick, Mark I., and Munday, Philip L. (2013) Increased CO₂ stimulates reproduction in a coral reef fish. Global Change Biology, 19 (10). pp. 3037-3045.

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

View at Publisher Website: http://dx.doi.org/10.1111/gcb.12259
 
27
6


Abstract

Ocean acidification is predicted to negatively impact the reproduction of many marine species, either by reducing fertilization success or diverting energy from reproductive effort. While recent studies have demonstrated how ocean acidification will affect larval and juvenile fishes, little is known about how increasing partial pressure of carbon dioxide (pCO2) and decreasing pH might affect reproduction in adult fishes. We investigated the effects of near-future levels of pCO2 on the reproductive performance of the cinnamon anemonefish, Amphiprion melanopus, from the Great Barrier Reef, Australia. Breeding pairs were held under three CO2 treatments [Current-day Control (430 μatm), Moderate (584 μatm) and High (1032 μatm)] for a 9-month period that included the summer breeding season. Unexpectedly, increased CO2 dramatically stimulated breeding activity in this species of fish. Over twice as many pairs bred in the Moderate (67% of pairs) and High (55%) compared to the Control (27%) CO2 treatment. Pairs in the High CO2 group produced double the number of clutches per pair and 67% more eggs per clutch compared to the Moderate and Control groups. As a result, reproductive output in the High group was 82% higher than that in the Control group and 50% higher than that in the Moderate group. Despite the increase in reproductive activity, there was no difference in adult body condition among the three treatment groups. There was no significant difference in hatchling length between the treatment groups, but larvae from the High CO2 group had smaller yolks than Controls. This study provides the first evidence of the potential effects of ocean acidification on key reproductive attributes of marine fishes and, contrary to expectations, demonstrates an initially stimulatory (hormetic) effect in response to increased pCO2. However, any long-term consequences of increased reproductive effort on individuals or populations remain to be determined.

Item ID: 29503
Item Type: Article (Research - C1)
ISSN: 1365-2486
Keywords: Amphiprion, climate change, coral reef fish, hormesis, ocean acidification, reproduction, trade-offs
Funders: Australian Research Council (ARC), ARC Centre of Excellence for Coral Reef Studies, Sea World Research and Rescue Foundation, Australian Coral Reef Society, Great Barrier Reef Marine Park Authority (GBRMPA)
Projects and Grants: JCU ethics A1427
Date Deposited: 25 Sep 2013 05:26
FoR Codes: 06 BIOLOGICAL SCIENCES > 0699 Other Biological Sciences > 069902 Global Change Biology @ 50%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 50%
SEO Codes: 96 ENVIRONMENT > 9603 Climate and Climate Change > 960399 Climate and Climate Change not elsewhere classified @ 50%
97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 50%
Downloads: Total: 6
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page