Effects of capture surface morphology on feeding success of scyphomedusae: a comparative study
Effects of capture surface morphology on feeding success of scyphomedusae: a comparative study
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DOI：
10.3354/meps12549
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发表时间：
2018-05-28
影响因子：
2.5
通讯作者：
Colin, Sean P.
中科院分区：
文献类型：
--
作者：
Bezio, Nicholas;Costello, John H.;Colin, Sean P.
摄食流觅食水母的捕食可能对猎物种群产生有害影响。了解控制不同类型猎物的猎物选择和摄食率的机制，使我们能够更好地预测这些水母的捕食影响。我们量化了多个scyphozoan水母物种的喂养过程中的每个后夹带阶段的结果，以了解后营养喂养事件如何影响喂养模式。使用3维视频，我们观察和量化的命运被动和主动游泳的猎物，被夹带在5个不同的scyphomedusan种属于该命令Semaeostomeae和Raciostomeae的喂养电流。少于65%的夹带猎物接触半口水母的捕获表面（称为接触效率），而根口水母与少于35%的夹带在摄食培养基中的猎物接触。然而，当接触时，猎物很可能被所有检查的物种摄入（> 90%）。这些结果表明，猎物捕获扁圆水母似乎在很大程度上是有限的概率，猎物夹带在喂养电流将接触捕获表面。作为被动过程，进给过程的该接触阶段直接受到接触表面的形态的影响。接触阶段的喂养过程的重要性表明，在扁水母类类群之间观察到的猎物选择模式的差异可能占主导地位的接触表面的形态，而不是影响其他阶段的喂养过程中，即钟形和adenocysts的性状。
Predation by feeding-current foraging medusae can have detrimental effects on prey populations. Understanding the mechanics that control prey selection and ingestion rates with different types of prey enables us to better predict the predatory impact of these medusae. We quantified the outcomes of each post-entrainment stage of the feeding process in multiple scyphozoan jellyfish species to understand how post-entiainment feeding events influence feeding patterns. Using 3-dimensional video, we observed and quantified the fate of both passive and actively swimming prey that were entrained in the feeding current of 5 different scyphomedusan species belonging to the orders Semaeostomeae and Rhizostomeae. Less than 65 % of entrained prey contacted the capture surfaces (termed contact efficiency) of the semaeostome medusae, while the rhizostome medusae came into contact with less than 35% of the prey entrained in the feeding cuiient. However, when contacted, prey were veiy likely to be ingested (> 90%) by all species examined. These results suggest that prey capture by oblate medusae appears to be largely limited by the probability that prey entrained in the feeding current will contact a capture surface. As a passive process, this contact stage of the feeding process is directly affected by the morphology of the contact surfaces. The importance of the contact stage of the feeding process suggests that differences in prey selection patterns observed among oblate medusan taxa are likely dominated by the morphology of contact surfaces as opposed to traits which influence the other stages of the feeding process, i.e. bell shape and nematocysts.