A decadal trend of juvenile European sea bass (Dicentrarchus labrax, L.) responses to climate patterns in the Mondego estuary, Portugal

Abstract

Event Abstract Back to Event A decadal trend of juvenile European sea bass (Dicentrarchus labrax, L.) responses to climate patterns in the Mondego estuary, Portugal Eduardo G. Bento1*, Tiago Grilo1, Marina Dolbeth1, Dániel Nyitrai1, Miguel Â. Pardal1 and Filipe Martinho1 1 University of Coimbra, Centre for Functional Ecology - CFE, Department of Life Sciences, Portugal Estuarine systems support the life cycle stages of commercially important marine fish and are influenced by large and local-scale climatic patterns. Also, extreme events triggered by climate changes may influence the functioning of nursery grounds and recruitment for several fish species. In this study, performed in the Mondego estuary, Portugal, we used an 11-year database (2003-2013) for analyzing the variability in the population of a marine juvenile migrant fish, the European sea bass Dicentrarchus labrax, regarding changes in abundance, population structure, growth rates and secondary production and annual day of peak abundance. Higher densities and production occurred at the beginning of the study, but no differences in 0-group growth could be observed. In order to detect change points in both biological and climatic data, the cumulative sum (CUSUM) of the deviations from the mean for the 2003-2013 period were determined for each parameter. The relationship between large- and local-scale drivers and 0-group abundance, secondary production and day of peak abundance were evaluated using a Pearson correlation analysis of CUSUM of biological and environmental data, considering the correspondent yearly values and with a time-lag of 1 year. The North Atlantic Oscillation (NAO) index, sea surface temperature (SST) and their respective winter values were tested as large-scale factors, while river runoff, salinity and water temperature were considered as local climate patterns. River runoff was the significant factor explaining D. labrax 0-group abundances and the NAO and water temperature were also significant predictors considering the 1-year lag. Regarding D. labrax 0-group secondary production, salinity and water temperature were the significant predictors. The NAO with 1-year lag was also negatively correlated with the day of peak abundance. The observed variability regarding yearly trends in abundance of juvenile fish was mostly linked to local-scale climate patterns, which can influence habitat use patterns, whereas large-scale factors (NAO, SST) seem to operate at a wider time frame, as observed by the lag of 1-year on their influence on juvenile sea bass abundance. Keywords: European sea bass, Recruitment variability, climatic changes, Mondego Estuary, large-scale patterns Conference: XV European Congress of Ichthyology, Porto, Portugal, 7 Sep - 11 Sep, 2015. Presentation Type: Oral Presentation Topic: Life Cycles, Migration and Connectivity Citation: Bento EG, Grilo T, Dolbeth M, Nyitrai D, Pardal M and Martinho F (2015). A decadal trend of juvenile European sea bass (Dicentrarchus labrax, L.) responses to climate patterns in the Mondego estuary, Portugal. Front. Mar. Sci. Conference Abstract: XV European Congress of Ichthyology. doi: 10.3389/conf.FMARS.2015.03.00144 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 27 Nov 2015; Published Online: 27 Nov 2015. * Correspondence: Mr. Eduardo G Bento, University of Coimbra, Centre for Functional Ecology - CFE, Department of Life Sciences, Coimbra, Portugal, edugraben@gmail.com Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Eduardo G Bento Tiago Grilo Marina Dolbeth Dániel Nyitrai Miguel  Pardal Filipe Martinho Google Eduardo G Bento Tiago Grilo Marina Dolbeth Dániel Nyitrai Miguel  Pardal Filipe Martinho Google Scholar Eduardo G Bento Tiago Grilo Marina Dolbeth Dániel Nyitrai Miguel  Pardal Filipe Martinho PubMed Eduardo G Bento Tiago Grilo Marina Dolbeth Dániel Nyitrai Miguel  Pardal Filipe Martinho Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.