Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/201
Título: Are sardine larvae caught off northern Portugal in winter starving? An approach examining nutritional conditions
Autor: Chícharo, Alexandra
Esteves, E.
Santos, A. M. P.
Santos, Antonina dos
Peliz, A.
Re, P.
Palavras-chave: Peixe
Hidrobiologia da pesca
Fish larvae
Daily egg production
RNA:DNA ratios
Sardina pilchardus
Microzooplankton biomass
Data: 2003
Editora: Inter Research
Citação: Marine Ecology Progress Series
Resumo: Recently, winter upwelling events off western Iberia have become more frequent. This may affect the production and survival of sardines egss and larvae through increased offshore transport. By analysis of RNA: DNA ratios, we investigated the impact of winter upwelling events on the larval conditions of Sardina pilchardus larvaeas a function of oceanographic conditions and food availability. Larvae were collected on a research cruise off northern Portugal in February 2000. Environmental parameters such as wind, water temperature, salinity microzooplankton biomass and daily egg production of the calanoid copepod Calanus helgolandicus also measured. The mean RNA:DNA ratios wererelatively high, indicating that almost all larvae collected were good condition. This was in agreement with the high microzooplankton biomass and high daily egg production of the copepod C. helgolandicus recorded during the same period. No adverse effects of upwelling causing offshore transport of larvae into poor feeding areas could be demonstrated because of the presence of a stratified warm plume with consequent high food production.
URI: http://hdl.handle.net/10400.1/201
ISSN: 0171-8630
Versão do Editor: http://www.int-res.com/articles/meps2003/257/m257p303.pdf
Aparece nas colecções:ISE2-Artigos (em revistas ou actas indexadas)

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