Cientistas do IPBES preparam diagnóstico sobre biodiversidade brasileira

Escrito por Clipping

Publicado: 17 Novembro 2015

Fonte: Agência Fapesp

Data de publicação: 17-11-2015 14:35

Um diagnóstico sobre a biodiversidade do Brasil e os serviços ecossistêmicos a ela atrelados deve ser divulgado em 2018 por cientistas brasileiros que integram a Plataforma Intergovernamental de Biodiversidade e Serviços Ecossistêmicos (IPBES), entidade internacional criada em 2012 para atuar na interface entre a ciência e a tomada de decisão política.

Temperature dependence of CO2-enhanced primary production in the European Arctic Ocean

Escrito por Clipping

Publicado: 31 Agosto 2015

Fonte: Nature Climate Change

Data de publicação: 31-08-2015 10:56

Authors: J. M. Holding,C. M. Duarte, M. Sanz-Martín, E. Mesa, J. M. Arrieta, M. Chierici, I. E. Hendriks, L. S. García-Corral,

The Arctic Ocean is warming at two to three times the global rate and is perceived to be a bellwether for ocean acidification. Increased CO2 concentrations are expected to have a fertilization effect on marine autotrophs, and higher temperatures should lead to increased rates of planktonic primary production. 

Yet, simultaneous assessment of warming and increased CO2 on primary production in the Arctic has not been conducted. Here we test the expectation that CO2-enhanced gross primary production (GPP) may be temperature dependent, using data from several oceanographic cruises and experiments from both spring and summer in the European sector of the Arctic Ocean. Results confirm that CO2 enhances GPP (by a factor of up to ten) over a range of 145–2,099μatm; however, the greatest effects are observed only at lower temperatures and are constrained by nutrient and light availability to the spring period. The temperature dependence of CO2-enhanced primary production has significant implications for metabolic balance in a warmer, CO2-enriched Arctic Ocean in the future. In particular, it indicates that a twofold increase in primary production during the spring is likely in the Arctic.The Arctic Ocean is warming at two to three times the global rate1 and is perceived to be a bellwether for ocean acidification2, 3. Increased CO2 concentrations are expected to have a fertilization effect on marine autotrophs4, and higher temperatures should lead to increased rates of planktonic primary production5. Yet, simultaneous assessment of warming and increased CO2 on primary production in the Arctic has not been conducted. Here we test the expectation that CO2-enhanced gross primary production (GPP) may be temperature dependent, using data from several oceanographic cruises and experiments from both spring and summer in the European sector of the Arctic Ocean. Results confirm that CO2 enhances GPP (by a factor of up to ten) over a range of 145–2,099μatm; however, the greatest effects are observed only at lower temperatures and are constrained by nutrient and light availability to the spring period. The temperature dependence of CO2-enhanced primary production has significant implications for metabolic balance in a warmer, CO2-enriched Arctic Ocean in the future. In particular, it indicates that a twofold increase in primary production during the spring is likely in the Arctic.

Vencedor da primeira edição do Prêmio Prof. Sérgio de Almeida Rodrigues

Escrito por Biblioteca

Publicado: 28 Outubro 2015

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O Centro de Biologia Marinha tem a satisfação de anunciar o vencedor da primeira edição do Prêmio Prof. Sérgio de Almeida Rodrigues.

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Fonte: Pesquisa Fapesp

Data de publicação: 01-08-2015 00:00

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