Fatty acids in eggs of anchoveta Engraulis ringens during two contrasting winter spawning seasons
Fatty acids in eggs of anchoveta Engraulis ringens during two contrasting winter spawning seasons
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DOI：
10.3354/meps08819
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发表时间：
2010-12
影响因子：
2.5
通讯作者：
L. Castro;G. Claramunt;H. González;M. Krautz;A. Llanos-Rivera;J. Méndez;W. Schneider;S. Soto
中科院分区：
文献类型：
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作者：
L. Castro;G. Claramunt;H. González;M. Krautz;A. Llanos-Rivera;J. Méndez;W. Schneider;S. Soto
我们评估了从浮游生物中收集的鳀鱼卵的脂肪酸（FA）组成，以及雌性鳀鱼的繁殖特征和2005年和2007年冬季产卵高峰期的环境条件。智利塔尔卡瓦诺附近的3个大陆架站的环境条件在年份之间存在显着差异，2005年的水体较温暖、较淡水，而2007年的水体较冷、较咸。我们证实了这些差异。 2007 年南风引起沿海上升流，在沿海卵收集站测量，并使用更广泛区域的卫星图像进行测量。2005 年冬季主要由典型的小型杂食性和肉食性桡足类动物（Oncaea 和 Oithona）主导，而 2007 年，较大的食草类桡足类动物（多不饱和脂肪酸 (PUFA) 水平较高，是上升流条件下的典型现象）占主导地位。硅藻丰度（以二十二碳六烯酸/二十碳五烯酸（DHA/EPA）比率表示）增加。尽管 2005 年鳀鱼卵较小，但由于卵巢较大，2007 年的批量大小和每只雌性的相对繁殖力较大。虽然 2005 年鳀鱼卵中饱和脂肪酸 (SAFA)、单不饱和脂肪酸 (MUFA) 和多不饱和脂肪酸 (PUFA) 的相对含量在海洋鱼类报告的范围内，但 2007 年，多不饱和脂肪酸 (PUFA) 处于较高范围，而 SAFA 和 MUFA 则处于较低范围。我们的结果表明，2007 年鳀鱼卵中较高的 PUFA 值和较低的 DHA/EPA 值可能是由于较大草食性桡足类动物的消耗增加或直接消耗较大的浮游植物（寒冷上升流条件下的典型猎物）造成的。相反，2005 年 SAFA 和 MUFA 水平升高可能是由于成鱼消耗较小的杂食性/肉食性桡足类动物造成的。
We assessed the fatty acid (FA) composition of anchoveta eggs collected from the plank- ton along with female anchoveta reproductive traits and environmental conditions during peak win- ter spawning in 2005 and 2007. Environmental conditions differed markedly between years at 3 con- tinental shelf stations off Talcahuano, Chile, with a warmer, fresher water column in 2005 and a colder, saltier one in 2007. We confirmed differences in sea surface temperature, measured both at the coastal egg collection stations and using satellite images over a broader area, caused by south winds that induced coastal upwelling in 2007. Winter 2005 was largely dominated by typical small omnivorous and carnivorous copepods (Oncaea and Oithona), whereas in 2007, larger herbivorous calanoid copepods (with high polyunsaturated FA (PUFA) levels that are typical of upwelling condi- tions) and diatom abundance (indicated by the docosahexaenoic/eicosapentaenoic acids (DHA/EPA) ratio) increased. Although anchoveta eggs were smaller in 2005, batch size and relative fecundity per female were greater in 2007 because of larger ovaries. While relative amounts of saturated (SAFA), monounsaturated (MUFA) FA, and PUFA in anchoveta eggs in 2005 were within the ranges reported for marine fish species, in 2007, PUFA were in the upper and SAFA and MUFA in the lower ranges. Our results suggest that the higher PUFA and lower DHA/EPA values for anchoveta eggs in 2007 may have resulted from increased consumption of larger herbivorous copepods or direct consumption of larger phytoplankton, prey typical of cold upwelling conditions. Conversely, elevated SAFA and MUFA levels in 2005 may have resulted from consumption of smaller omnivorous/carnivorous cope- pods by adult fish.