Abstract：
:The Portuguese continental coast is influenced by several oceanographic processes and is located near the confluence of three biogeographic realms (from the North Atlantic, South Atlantic and Mediterranean). Given these features, the topography of the Portuguese coast, possible variations in fishing effort and reported increasing sea surface temperature in the last decades, we hypothesized that changes in marine communities in space and time occurred since 1990. In this study, research survey data collected yearly along the Portuguese continental slope (20-500 m deep) from 1990 to 2016 were analysed with the objective of identifying spatio-temporal changes. Latitude and depth were found to play a major role in communities' spatial differentiation, probably associated to temperature, and three ecological areas were defined (north, southwest and south). In the studied period, Macroramphosus spp. abundance showed a marked decrease in all areas whereas Sparids increased in abundance in the south. Despite these major changes and fluctuations in species abundance over time no major trends in communities were observed. Fishing activity, environmental conditions (including climate change) and biotic factors are all drivers possibly responsible for those changes.
journal_name
Mar Environ Resjournal_title
Marine environmental researchauthors
Moura T,Chaves C,Figueiredo I,Mendes H,Moreno A,Silva C,Vasconcelos RP,Azevedo Mdoi
10.1016/j.marenvres.2020.105044subject
Has Abstractpub_date
2020-09-01 00:00:00pages
105044eissn
0141-1136issn
1879-0291pii
S0141-1136(19)30867-0journal_volume
160pub_type
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