Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/5710
Título: Ontogeny of swimming behaviour in sardine Sardina pilchardus larvae and effect of larval nutritional condition on critical speed
Autor: Silva, L.
Faria, Ana Margarida da Silva
Chícharo, Alexandra
Garrido, S.
Palavras-chave: Ontogeny
Critical swimming speed
Sardina pilchardus
Nucleic acid derived indices
Data: 2014
Editora: Inter Research
Citação: Silva, L; Faria, AM; Teodósio, MA; Garrido, S.Ontogeny of swimming behaviour in sardine Sardina pilchardus larvae and effect of larval nutritional condition on critical speed, Marine Ecology Progress Series, 504, na, 287-300, 2014.
Resumo: The ontogeny of swimming behaviour in sardine Sardina pilchardus larvae was studied, from hatching to 75 days post-hatch (dph), by measuring the critical swimming speed (Ucrit) and observing locomotory behaviour. In addition, the effect of larval nutritional condition on Ucrit at the onset of their swimming abilities (20 to 25 dph) was evaluated by rearing larvae under 4 different feeding treatments. Diets consisted of different concentrations of dinoflagellates, rotifers and the copepod Acartia grani, and a wild plankton assemblage. Recently hatched larvae were mostly inactive, but from 2 dph onwards larvae started to swim freely in the rearing tank, and time spent swimming increased throughout ontogeny. Larvae younger than 20 dph (i.e. <7.90 mm TL) could not swim for the entire adjustment period at the minimum current speed, but thereafter Ucrit increased significantly with larval age and length, reaching a maximum of 9.47 cm s-1 at 19.10 mm TL and 55 dph. Growth, survival and the nutritional condition of sardine larvae, assessed by the RNA residual index, were significantly higher for larvae reared with the high-concentration diet, contrary to the other derived nucleic acids indices (RNA/DNA and DNA/DW), which showed no differences between diets. Despite differences in the survival and growth rates of sardine larvae, Ucrit at the onset of swimming did not differ significantly among diets, but was significantly related to larval nutritional condition as assessed by the RNA residual index. Overall, our results show that early larval stages of sardines have poor swimming ability and probably rely on food patches in the wild to survive; however, close to metamorphosis (especially from 45 dph onwards), larvae spend most of the time swimming and are capable of resisting the mean current speeds of their natural environment, which may strongly enhance chances for survival.
Peer review: yes
URI: http://hdl.handle.net/10400.1/5710
ISSN: 0171-8630
Versão do Editor: http://www.int-res.com/abstracts/meps/v504/p287-300/
Aparece nas colecções:FCT2-Artigos (em revistas ou actas indexadas)

FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpace
Formato BibTex MendeleyEndnote 

Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.