Prey resource use by coexistent hydromedusae from Friday Harbor, Washington
Prey resource use by coexistent hydromedusae from Friday Harbor, Washington
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DOI：
10.4319/lo.2002.47.4.0934
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发表时间：
2002-07-01
影响因子：
4.5
通讯作者：
Colin, SP
中科院分区：
文献类型：
--
作者：
Costello, JH;Colin, SP
猎物的选择模式进行了量化的同域群水螅水母从星期五港，华盛顿州。物种之间的选择模式各不相同，但在样本日期之间基本上是可复制的，并且与邻近地区类似研究中发现的饮食模式相似。Amphalus觅食水母（Aglantha digitale，Sarsia tubulosa和Proboscidactyla flavicomata）主要以甲壳类和纤毛虫猎物为食，但这些水螅水母物种的饮食生态位集中在不同部分的浮游生物上。因此。在伏击觅食的水螅水母之间发生了很少的饮食重叠。相比之下，巡航捕食者（Aequoroa维多利亚，Mitrocoma cellularia和Phialidium gregarium）的饮食生态位基本上重叠，因为这些物种都以类似的软体猎物，如鸡蛋和apacitularians为食。这些结果有两个重要的影响涉及水母的营养模式。第一，水螅水母类不同的猎物计数和捕获机制（伏击与巡航模式）导致重要的种间饮食差异，因此。水母的营养作用。第二，而巡航，水母可能会消耗类似的猎物，因此形成一个喂养公会，水母觅食可能会经历实质上更少的猎物重叠和。在这里研究的群落中，没有经历来自其他水母物种的潜在的强烈摄食竞争。
Prey selection patterns were quantified for a sympatric group of hydromedusae from Friday Harbor, WA. Selection patterns varied between species, but were largely replicable between sample dates and resembled dietary patterns found in similar studies from neighboring regions. Ambush-foraging medusae (Aglantha digitale, Sarsia tubulosa, and Proboscidactyla flavicirrata) fed primarily on crustacean and ciliated prey but the dietary niches of these hydromedusan species centered on different fractions of the available plankton. Consequently. little dietary overlap occurred between the ambush foraging hydromedusae. In contrast, the dietary niches of cruising predators (Aequoroa victoria, Mitrocoma cellularia, and Phialidium gregarium) overlapped substantially because those species all fed on similar soft-bodied prey such as eggs and appendicularians. These results have two important implications for trophic patterns involving medusae. First, different mechanisms of prey eucounter and capture used by hydromedusae (ambush vs. cruising patterns) result in important interspecific dietary differences and, hence. trophic roles of the medusae. Second, whereas cruising, medusae may consume similar prey and hence form a feeding guild, ambush-foraging medusae may experience substantially less prey overlap and. for the community examined here, do not experience potentially strong feeding competition from other medusan species.