Juvenile sea stars exposed to acidification decrease feeding and growth with no acclimation potential

Appelhans, Yasmin, Thomsen, Jörn, Opitz, Sebastian, Pansch, Christian, Melzner, Frank and Wahl, Martin (2014) Juvenile sea stars exposed to acidification decrease feeding and growth with no acclimation potential Marine Ecology Progress Series, 509 . pp. 227-239. DOI 10.3354/meps10884.

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Ocean acidification has the potential to affect growth and calcification of benthic marine invertebrates, particularly during their early life history. We exposed field-collected juveniles of Asterias rubens from Kiel Fjord (western Baltic Sea) to 3 seawater CO2 partial pressure (pCO2) levels (ranging from around 650 to 3500 µatm) in a long-term (39 wk) and a short-term (6 wk) experiment. In both experiments, survival and calcification were not affected by elevated pCO2. However, feeding rates decreased strongly with increasing pCO2, while aerobic metabolism and NH4+ excretion were not significantly affected by CO2 exposure. Consequently, high pCO2 reduced the scope for growth in A. rubens. Growth rates decreased substantially with increasing pCO2 and were reduced even at pCO2 levels occurring in the habitat today (e.g. during upwelling events). Sea stars were not able to acclimate to higher pCO2, and growth performance did not recover during the long-term experiment. Therefore, the top-down control exerted by this keystone species may be diminished during periods of high environmental pCO2 that already occur occasionally and will be even higher in the future. However, some individuals were able to grow at high rates even at high pCO2, indicating potential for rapid adaption. The selection of adapted specimens of A. rubens in this seasonally acidified habitat may lead to higher CO2 tolerance in adult sea stars of this population compared to the juvenile stage. Future studies need to address the synergistic effects of multiple stressors such as acidification, warming and reduced salinity, which will simultaneously impact the performance of sea stars in this habitat.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/265847
Keywords: Ocean acidification; CO2; Predation; Metabolism; Calcification; Sea star; Asterias rubens; Selection; Juvenile
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-B Experimental Ecology - Benthic Ecology
Refereed: Yes
DOI etc.: 10.3354/meps10884
ISSN: 0171-8630
Projects: BIOACID, Future Ocean, ECO2
Date Deposited: 09 Oct 2014 11:21
Last Modified: 03 Jul 2015 06:47
URI: http://oceanrep.geomar.de/id/eprint/25750

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