Percorrer por autor "Ramos, Joana Barcelos e"
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- Mollusc epifaunal assemblages are simplified due to habitat shifts under ocean acidificationPublication . Martins, Gustavo M.; Jiménez Herrero, Javier; Canella, Cristina; Ávila, Sérgio P.; Prestes, Afonso; Ramos, Joana Barcelos e; Hall-Spencer, Jason M.; Faria, JoãoOcean acidification can have profound effects on marine organisms, particularly those that rely on calcium carbonate for shell and skeleton formation, resulting in structural changes to marine ecosystems. Here, we contrast the structure of marine mollusc communities (epifauna) associated with an abundant shallow-water macroalga, Halopteris scoparia, in an area with seawater carbonated by natural CO2 seeps and three reference sites, off the Azores archipelago. Epifaunal mollusc abundance and diversity were significantly lower at the CO2 seep compared to reference sites whilst species accumulation curves and Jaccard multivariate analyses showed that the mollusc assemblage was consistently less diverse at the CO2 seep. Most of the abundant epifaunal species that were present at the CO2 seep were also found at reference sites, but less common or rare species were generally absent from the former. We conclude that while some molluscs are likely to cope with ocean acidification, the overall biodiversity of epifaunal molluscs will be simplified under these conditions in a future ocean.
- Ocean acidification impacts on zooplanktonPublication . Campoy, Ana N.; Cruz, Joana; Ramos, Joana Barcelos e; Viveiros, Fátima; Range, Pedro; Teodosio, M A; Teodósio, M. Alexandra; Barbosa, Ana B.Global change is and will continue impacting biodiversity, as many studies have already documented. Rising atmospheric CO2 is alleviated by oceanic uptake, since atmosphere and surface ocean exchange CO2 , but it also modifies the ocean carbonate system towards decreased carbonate ion concentrations and a corresponding decline in seawater pH. This process is known as ocean acidification (OA) and has a direct effect on plankton, namely calcifying organisms, such as coccolithophores, foraminifers, corals, molluscs and crustaceans, with consequences for the entire marine ecosystem (see review by Reibesell and Tortell 2011).