RT journal article
T1 Response of macroalgal assemblages from rockpools to climate change: effects of persistent increase in temperature and CO2
A1 Olabarria, Celia
A1 Arenas, Francisco
A1 Viejo, Rosa M.
A1 Gestoso García, Ignacio José
A1 Vaz-Pinto, Fátima
A1 Incera, Mónica
A1 Rubal, Marcos
A1 Cacabelos, Eva
A1 Veiga, Puri
A1 Sobrino, Cristina
AB Anthropogenically induced global climate change has important implications for marine ecosystems with unprecedentedecological and economic consequences. Climate change will include the simultaneous increase of temperature and CO 2concentration in oceans. However, experimental manipulations of these factors at the community scale are rare. In thisstudy, we used an experimental approach in mesocosms to analyse the combined eff ects of elevated CO 2 and temperatureon macroalgal assemblages from intertidal rock pools. Our model systems were synthetic assemblages of varying diversityand understory component and canopy species identity. We used assemblages invaded by the non-indigenous canopyforming alga Sargassum muticum and assemblages with the native canopy species Cystoseira tamariscifolia . We examinedthe eff ects of both climate change factors on several ecosystem functioning variables (i.e. photosynthetic effi ciency,productivity, respiration and biomass) and how these eff ects could be shaped by the diversity and species identity ofassemblages. CO 2 alone or in combination with temperature aff ected the performance of macroalgae at both individualand assemblage level. In particular, high CO 2 and high temperature (20 ° C) drastically reduced the biomass of macroalgalassemblages and aff ected their productivity and respiration rates. Th e identity of canopy species also played an importantrole in shaping assemblage responses, whereas species richness did not seem to aff ect such responses. Species belonging tothe same functional eff ect group responded diff erently to the same environmental conditions. Data suggested that assemblagesinvaded with S. muticum might be more resistant in a future scenario of climate change. Th us, in a future scenarioof increasing temperature and CO 2 concentration, macroalgal assemblages invaded with canopy-forming species sharingresponse traits similar to those of S. muticum could be favoured.
PB Nordic Society Oikos
SN 0030-1299
YR 2012
FD 2012
LK http://hdl.handle.net/10498/36311
UL http://hdl.handle.net/10498/36311
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 13-nov-2026