ONTOGENETIC AND TEMPORAL SHIFTS IN THE DIET OF THE AMPHIPOD GAMMARUS FASCIATUS, IN THE OHIO RIVER
ONTOGENETIC AND TEMPORAL SHIFTS IN THE DIET OF THE AMPHIPOD GAMMARUS FASCIATUS, IN THE OHIO RIVER
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俄亥俄河片脚类 Gammarus fasciatus 饮食的个体发生和时间变化
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
J. Thorp
中科院分区：
文献类型：
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作者：
R. Summers;Michael D. Delong;J. Thorp
-进行了一项实地研究，以确定俄亥俄河中片脚类 Gammarus fasciatus Say 的饮食是否发生个体发育或时间变化。一年间，我们每月从俄亥俄河的卵石和障碍物栖息地收集端脚类动物。对收集的片脚类动物的肠道内容物进行显微镜分析，以确定是否存在碎屑、丝状藻类、硅藻和动物物质。 Gammarusfasciatus 消耗每种食物的量不同，具体取决于端脚类动物的大小和收集的月份。碎屑是片足类肠道中最常见的食物（100%检查肠道显微镜视野），其次是丝状藻类、硅藻和动物物质（G. fasciatus 肠道中每种食物类型的范围分别为：0.036-0.287、0.061-0.281、0.002-0.072）。食物的使用在个体发生上发生了变化：小型的G.fasciatus仅限于以碎屑为主的饮食，而较大的动物则消耗大量的丝状藻类、硅藻和动物物质。觅食也存在每月差异，这可能是由于食物类型的季节性丰度和其他环境因素的差异。我们认为，丝状藻类、硅藻和动物物质的丰富性和利用能力使得带状 G. fasciatus 种群能够在俄亥俄河中持续存在并维持大量的全年种群。
-A field study was conducted to determine if ontogenetic or temporal shifts occur in the diet of the amphipod Gammarus fasciatus Say in the Ohio River. Amphipods were collected monthly from cobble and snag habitats in the Ohio River for I yr. Gut contents of collected amphipods were analyzed microscopically for the presence of detritus, filamentous algae, diatoms and animal matter. Gammarusfasciatus consumed each food type in different amounts, depending on amphipod size and month collected. Detritus was the most common food item found in amphipod guts (100% of microscope fields in guts examined), followed in order by filamentous algae, diatoms and animal matter (the ranges of each food type in the guts of G. fasciatus were: 0.036-0.287, 0.061-0.281, 0.002-0.072, respectively). Food use shifted ontogenetically: small G. fasciatus were limited to a diet consisting mainly of detritus, whereas larger animals consumed significant amounts of filamentous algae, diatoms and animal matter. There were also monthly differences in foraging, presumably due to differences in seasonal abundances of food types and other environmental factors. We suggest that the abundance of, and ability to use filamentous algae, diatoms and animal matter allow populations of G. fasciatus to persist and maintain significant year-round populations in the Ohio River.