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Titolo:
Does the nutritional condition limit survival potential of sardine Sardinapilchardus (Walbaum, 1792) larvae off the north coast of Spain? RNA/DNA ratios and their variability
Autore:
Chicharo, MA; Chicharo, L; Valdes, L; Lopez-Jamar, E; Re, P;
Indirizzi:
Univ Algarve, UCTRA, P-8000 Faro, Portugal Univ Algarve Faro Portugal P-8000 Algarve, UCTRA, P-8000 Faro, Portugal Inst Espanol Oceanog, E-39004 Santander, Spain Inst Espanol Oceanog Santander Spain E-39004 g, E-39004 Santander, Spain Inst Espanol Oceanog, E-28020 Madrid, Spain Inst Espanol Oceanog Madrid Spain E-28020 Oceanog, E-28020 Madrid, Spain Univ Lisbon, Fac Ciencias, Lab Mar Guia, P-2750 Cascais, Portugal Univ Lisbon Cascais Portugal P-2750 b Mar Guia, P-2750 Cascais, Portugal
Titolo Testata:
FISHERIES RESEARCH
fascicolo: 1, volume: 39, anno: 1998,
pagine: 43 - 54
SICI:
0165-7836(199812)39:1<43:DTNCLS>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
RNA DNA RATIOS; THERAGRA-CHALCOGRAMMA; CLUPEA-HARENGUS; HERRING LARVAE; MARINE FISHES; GROWTH; RECRUITMENT; PREDATION; ALASKA; STRAIT;
Keywords:
fish larvae; nutritional condition; Sardina pilchardus; RNA/DNA ratio;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Chicharo, MA Univ Algarve, UCTRA, Campus Gambelas, P-8000 Faro, Portugal Univ Algarve Campus Gambelas Faro Portugal P-8000 , Portugal
Citazione:
M.A. Chicharo et al., "Does the nutritional condition limit survival potential of sardine Sardinapilchardus (Walbaum, 1792) larvae off the north coast of Spain? RNA/DNA ratios and their variability", FISH RES, 39(1), 1998, pp. 43-54

Abstract

The aim of this study was to determine the nutritional condition of Sardinia pilchardus larvae and the percentage of larvae that were starving at thetime of capture. The survey was conducted, during the spawning season, in April and May of 1991 and 1992, off the northern coast of Spain. An accepted fluorimetric technique was used to determine the concentrations of both RNA and DNA and to calculate RNA/DNA ratio for each larva. RNA/DNA ratios were related to the zooplankton biomass (>53 mu m). Low percentages of starving larvae (RNA/DNA ratio less than 1.3) were registered, ranging from 0% to2.5%. Results based on the mean and variance of individual larval growth rates showed that predation pressure was not increasing from 1991 to 1992. Based on the presence of sardine larvae in good condition together with low predation, a high recruitment was expected. However, the 1993 recruitment, from 1992 spring spawning, was very poor. This was associated mainly with unfavourable advection from the nursery area. Moreover, even low levels of starvation, such as registered, operating over long time periods could have considerable consequences for larval mortality. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 19:43:33