Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, San Juan 670, B8000ICN Bahía Blanca, Argentina.
J Fish Biol. 2011 Jun;78(7):2052-66. doi: 10.1111/j.1095-8649.2011.02995.x. Epub 2011 May 10.
The goals of this study were to describe the diet and estimate the trophic level and food selection of Jenyns's sprat Ramnogaster arcuata, one of the common fishes in the Bahía Blanca estuary in Argentina. The copepods Acartia tonsa [53·7% index of relative importance (I(RI))] and Eurytemora americana (13·4% I(RI)), the mysid Arthromysis magellanica (13·9%I(RI)) and the small shrimp Peisos petrunkevitchi (8·2% I(RI)) were the most important food items for this species, and its diet exhibited monthly variability with respect to the principal prey categories. The zooplankton species in the study area consisted of 32 taxa. Acartia tonsa was the most abundant species [54% individuals (N) m(-3)], followed by Balanus glandula (13·8% N m(-3)) and E. americana (10·1% N m(-3)). The rest of the zooplankton groups represented <3% N m(-3). The most preferred items throughout the year were A. magellanica and Idotea sp. The trophic level value estimated was 3·1.
本研究的目的是描述詹尼氏磷虾 Ramnogaster arcuata 的饮食，并估计其营养级和食物选择，詹尼氏磷虾是阿根廷布兰卡港河口常见鱼类之一。桡足类丰年虫（相对重要性指数 [I(RI)] 的 53.7%）和美洲拟哲水蚤（I(RI) 的 13.4%）、磷虾糠虾（I(RI) 的 13.9%）和小对虾（I(RI) 的 8.2%）是该物种最重要的食物，其饮食表现出与主要猎物类别的逐月变化。研究区域的浮游动物物种由 32 个分类群组成。丰年虫是最丰富的物种 [个体数 (N) m(-3) 的 54%]，其次是藤壶（13.8% N m(-3)）和美洲拟哲水蚤（10.1% N m(-3)）。其余浮游动物组代表 <3% N m(-3)。全年最受欢迎的项目是磷虾糠虾和 Idotea sp。估计的营养级值为 3.1。
