| Summary: | Polar marine ecosystems have global ecological and economic importance because of their unique biodiversity and their major role in climate processes and commercial fisheries, among others. Portugal and Spain have been highly active in a wide range of disciplines in marine biology of the Antarctic and the Arctic. The main aim of this paper is to provide a synopsis of some of the results and initiatives undertaken by Portuguese and Spanish polar teams within the field of marine sciences, particularly on benthic and pelagic biodiversity (species diversity and abundance, including microbial, molecular, physiological and chemical mechanisms in polar organisms), conservation and ecology of top predators (particularly penguins, albatrosses and seals), and pollutants and evolution of marine organisms associated with major issues such as climate change, ocean acidification and UV radiation effects. Both countries have focused their polar research more in the Antarctic than in the Arctic. Portugal and Spain should encourage research groups to continue increasing their collaborations with other countries and develop multi-disciplinary research projects, as well as to maintain highly active memberships within major organizations, such as the Scientific Committee for Antarctic Research (SCAR), the International Arctic Science Council (IASC) and the Association of Polar Early Career Scientists (APECS), and in international research projects. Fundação para a Ciência e a Tecnologia PTDC/MAR/099366/2008, Pest-OE/MAR/UI0331/2011 Ministerio de Ciencia e Innovación POL2006-06399, CGL2007- 65453/ANT, CTM2010-17415/ANT, CLG2007-28872-E/ANT, REN2002-11565-E/ANT “CASES-2003/4” Xunta de Galicia CTM2009-11128ANT Fondo Europeo de Desarrollo Regional GL2007-64149/ANT, CTM2011-24007, REN2001-5004/ANT, CGL2004-01348, POL2006-05175, CGL2007-60369, CTM2009-08154-E, CTM2011- 24427
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