Effects of elevated CO2 and temperature on an intertidal harpacticoid copepod community

• Published in: ICES Journal of Marine Science
• Main Authors: Sarmento, Visnu Cunha, Parreira Santos, Paulo Jorge, Hale, Rachel, Ingels, Jeroen, Widdicombe, Stephen
• Other Authors: Norkko, Joanna, Conselho Nacional de Ciência e Tecnologia, Plymouth Marine Laboratory Post-doctoral Research Fellowship, University of Exeter and a Marie Curie Intra-European Fellowship, 7th European Commission Framework Programme
• Format: Article in Journal/Newspaper
• Language: English
• Published: Oxford University Press (OUP) 2016
• Subjects: Ecology; Aquatic Science; Ecology, Evolution, Behavior and Systematics; Oceanography; Ocean acidification
• Online Access: http://dx.doi.org/10.1093/icesjms/fsw192; http://academic.oup.com/icesjms/article-pdf/74/4/1159/31244921/fsw192.pdf

Warming and ocean acidification have been shown to have significant impacts on marine organisms. However, none studies have addressed the impact of these two stressors on harpacticoid copepod community structure. A mesocosm experiment was conducted to assess the potential interactive impact of different levels of elevated CO2 and temperature on an intertidal harpacticoid copepod community. Artificial substrate units (ASUs) colonized by meiofauna from the extreme low intertidal zone were exposed to eight experimental treatments (four pH levels: 8.0, 7.7, 7.3 and 6.7, crossed with two temperature levels: 12 and 16 °C). After 60 days exposure communities were significantly affected by both stressors. The dominant harpacticoid species were mainly affected at treatments held at pH 6.7, but with divergent biological response patterns. At pH 6.7 Tisbe sp and Ectinosoma sp2 exhibited important density reductions, while considerable density increases were observed for Amphiascus longarticulatus and Amphiascoides golikovi. This study has demonstrated that elevated levels of CO2 and ocean warming may have substantial effects on the structure of harpacticoid communities. Importantly, the increase in malformations observed at pH 6.7 indicated that we need to consider sub-lethal effects that could have consequences for populations after long periods of exposure.