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首页> 外文期刊>Southeastern naturalist >Seasonal Specialization and Selectivity of the Eastern Mosquitofish, Gambusia holbrooki, toward Planktonic Prey
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Seasonal Specialization and Selectivity of the Eastern Mosquitofish, Gambusia holbrooki, toward Planktonic Prey

机译：东部蚊子，Gambusia holbrooki，对浮游生物猎物的季节性专业化和选择性。

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摘要

Gambusia holbrooki (Eastern Mosquitofish) are often characterized as opportunistic surface feeders. We examined seasonal shifts in prey use, feeding specialization, and prey electivity to determine whether a feeding bias existed toward small planktonic prey. We sampled invertebrates (from the water column and from near plant surfaces) and Eastern Mosquitofish over 4 seasons in a wetland (Cobb County, GA). Gut analysis indicated seasonal shifts from large to small prey, particularly toward cladocerans, even when larger prey remained abundant. Small planktonic prey were consumed by all sizes of Eastern Mosquitofish. Electivities for cladocerans tended to be positive, whereas electivities for other prey, and especially copepods, were negative. Prey that would be expected to aggregate at the air-water interface were consumed in much greater proportions than those sampled elsewhere in the environment, suggesting that Eastern Mosquitofish are able to consume cladocerans caught in the surface tension.
机译：Gambusia holbrooki（东部蚊子鱼）通常被描述为机会性表面饲养者。我们研究了猎物使用，饲料专门化和猎物选择性的季节性变化，以确定是否存在偏向小型浮游猎物的喂养偏见。我们在湿地（佐治亚州科布县）的4个季节中对无脊椎动物（从水柱和附近植物表面取样）和东部蚊子取样。肠道分析表明，即使大型猎物仍然丰富，季节性猎物也会从大型猎物转变为小型猎物，尤其是向角鲨转变。各种大小的东部蚊鱼都吃掉了小型浮游生物。锁骨的电气化倾向为正，而其他猎物，尤其是co足类的电气化为负。预计在空气-水界面处聚集的猎物比在环境中其他地方采样的猎物所消耗的比例要大得多，这表明东部蚊子能够消耗表面张力中捕获的锁骨。

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