期刊
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
卷 281, 期 1775, 页码 -出版社
ROYAL SOC
DOI: 10.1098/rspb.2013.2509
关键词
gabazine; muscimol; Sebastes; upwelling
资金
- MacEwan Research Office and Arts and Science grant
- MacEwan Student Enrichment Fund
- USA National Science Foundation [EF-1220641]
- UCSD Academic Senate award
- SIO Funds
- Alfred P. Sloan Research Fellowship [BR2013-103]
The average surface pH of the ocean is dropping at a rapid rate due to the dissolution of anthropogenic CO2, raising concerns for marine life. Additionally, some coastal areas periodically experience upwelling of CO2-enriched water with reduced pH. Previous research has demonstrated ocean acidification (OA)-induced changes in behavioural and sensory systems including olfaction, which is due to altered function of neural gamma-aminobutyric acid type A (GABA(A)) receptors. Here, we used a camera-based tracking software system to examine whether OA-dependent changes in GABA(A) receptors affect anxiety in juvenile Californian rockfish (Sebastes diploproa). Anxiety was estimated using behavioural tests that measure light/dark preference (scototaxis) and proximity to an object. After one week in OA conditions projected for the next century in the California shore (1125 +/- 100 mu atm, pH 7.75), anxiety was significantly increased relative to controls (483 +/- 40 mu atm CO2, pH 8.1). The GABA(A)-receptor agonist muscimol, but not the antagonist gabazine, caused a significant increase in anxiety consistent with altered Cl- flux in OA-exposed fish. OA-exposed fish remained more anxious even after 7 days back in control seawater; however, they resumed their normal behaviour by day 12. These results show that OA could severely alter rockfish behaviour; however, this effect is reversible.
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