Assessing the physiological responses of the gastropod Crepidula fornicata to predicted ocean acidification and warming

作者：Noisette Fanny^*; Bordeyne Francois; Davoult Dominique; Martin Sophie

来源：Limnology and Oceanography, 2016, 61(2): 430-444.

DOI：10.1002/lno.10225

Organisms inhabiting coastal waters naturally experience diel and seasonal physico-chemical variations. According to various assumptions, coastal species are either considered to be highly tolerant to environmental changes or, conversely, living at the thresholds of their physiological performance. Therefore, these species are either more resistant or more sensitive, respectively, to ocean acidification and warming. Here, we focused on Crepidula fornicata, an invasive gastropod that colonized bays and estuaries on northwestern European coasts during the 20th century. Small (<3 cm in length) and large (>4.5 cm in length), sexually mature individuals of C. fornicata were raised for 6 months in three different pCO(2) conditions (390 mu atm, 750 mu atm, and 1400 mu atm) at four successive temperature levels (10 degrees C, 13 degrees C, 16 degrees C, and 19 degrees C). At each temperature level and in each pCO(2) condition, we assessed the physiological rates of respiration, ammonia excretion, filtration and calcification on small and large individuals. Results show that, in general, temperature positively influenced respiration, excretion and filtration rates in both small and large individuals. Conversely, increasing pCO(2) negatively affected calcification rates, leading to net dissolution in the most drastic pCO(2) condition (1400 mu atm) but did not affect the other physiological rates. Overall, our results indicate that C. fornicata can tolerate ocean acidification, particularly in the intermediate pCO(2) scenario. Moreover, in this eurythermal species, moderate warming may play a buffering role in the future responses of organisms to ocean acidification.

• 出版日期2016-3