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M. C. Krautz L. R. Castro M. González A. Llanos-Rivera I. Montes H. González R. R. González J. C. Vera 《Marine Biology》2013,160(5):1177-1188
This study reports changes in ascorbic acid (AA) in anchoveta eggs, copepods and zooplankton during the 2006, 2007 and 2009 main spawning seasons in the coastal area of the central Humboldt Current System, Chile. Anchoveta eggs, copepods and total zooplankton community shared a seasonal variation and an increasing trend in AA concentration from winter through spring which was associated with the spring diatom bloom. The lineal relationship observed between AA concentration in anchoveta eggs, chlorophyll a and Sea Surface Temperature (SST) suggests that the increase in phytoplankton abundance could also increase the amount of AA in the spawning female anchoveta incorporated through tissue, thus increasing the concentration in their eggs. Ascorbic acid concentrations in copepods presented size (weight) dependence. Small copepods (e.g. Acartia, Oithona) had AA concentrations two orders of magnitude higher than the heavier weight class copepods (e.g. Calanus, Rhincalanus). Results of the determination of glutathione and the antioxidant potential showed a similar trend in interannual variations, suggesting that cold SST conditions observed in the 2007 spawning season could increase the consumption of antioxidants in early stages. Potential connections between AA concentration in the food web on anchoveta reproduction and egg hatching and embryo malformations are discussed. 相似文献
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M. C. Krautz S. Vásquez L. R. Castro M. González A. Llanos-Rivera S. Pantoja 《Marine Biology》2010,157(5):1137-1149
We assessed the ontogenetic changes in protein content and free amino acids (FAA) in eggs and early larvae of Engraulis ringens (anchoveta) off central Chile on different dates during the spawning season. On all sampling dates, a reduction in embryonic
yolk-sac volume, proteins and FAA concentrations occurred during development. Protein electrophoresis (SDS–PAGE) of eggs and
larvae showed at least 22 protein bands: 11 were consumed early and not detected after hatching. The proportion of essential
FAA (EFAA) was higher than the proportion of non-essential FAA (NEFAA) in early eggs and in 7 day-old larvae (82.5-73% EFAA
respectively). During egg development, the FAA pool was dominated by leucine, alanine and lysine, three amino acids contributing
35–44% of the total FAA in eggs. During larval development, histidine was the most abundant FAA. In July, total FAA constituted
13–18% of the egg dry weight. A similar proportion (45–51%) occurred in July between protein plus FAA and total lipids. The
differences in egg size during the spawning season along with variability in batch composition suggests that the female spawning
condition is a major factor determining egg quality and early offspring success. 相似文献
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