Seasonal hydromedusan feeding patterns in an Eastern Boundary Current show consistent predation on primary consumers

Seasonal hydromedusan feeding patterns in an Eastern Boundary Current show consistent predation on primary consumers
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东部边界洋流的季节性水生水母进食模式显示出对主要消费者的持续捕食

DOI:
10.1093/plankt/fbab059
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发表时间:
2021
影响因子:
2.1
通讯作者:
Sutherland, Kelly R
Sutherland, Kelly R
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Corrales-Ugalde, Marco;Sponaugle, Su;Cowen, Robert K;Sutherland, Kelly R

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西尼迪亚水母可以在高生产力的东部边界流(EBC)的食物网中占据主导地位。然而,EBCs中不明显的水母类的营养作用传统上被忽视了。2018-2019年冬季和夏季,我们在北加州洋流(NCC)两个跨陆架断面上的五个站位采集了中浮游动物。我们分析了11种水母的肠道内容物和猎物群落,以(I)确定水母对猎物资源的利用和(Ii)确定水母的营养生态位的时间变化,重点是收集最多的两个物种(Clytia gregaria和Eutonina incans)。NCC中的水母类主要摄食桡足类、附肢动物和无脊椎动物幼虫。水母饲料的非计量多维尺度显示,在丰度C的驱动下,猎物资源发生了季节性变化。Gregaria,冬季主要以桡足类卵为食,夏季主要以附肢动物和桡足类为食。在冬季季节,桡足类卵对猎物的选择性增加。GregariaandE.印度人。有趣的是,理论摄取率表明,这两个物种在上升流和非上升流条件下获得的碳量相似。水母类在不同季节的持续存在和捕食影响可能导致通过NCC食物网进行的碳和能量转移的显著影响。
Cnidarian jellyfish can be dominant players in the food webs of highly productive Eastern Boundary Currents (EBC). However, the trophic role of inconspicuous hydromedusae in EBCs has traditionally been overlooked. We collected mesozooplankton from five stations along two cross-shelf transects in the Northern California Current (NCC) during winter and summer of 2018–2019. We analyzed gut contents of 11 hydromedusan species and the prey community to (i) determine prey resource use by hydromedusae and (ii) determine temporal shifts in the trophic niche of hydromedusae, focusing on the two most collected species (Clytia gregariaandEutonina indicans). Hydromedusae in the NCC fed mostly on copepods, appendicularians and invertebrate larvae. Nonmetric multidimensional scaling of hydromedusan diets showed seasonal shifts in prey resource driven by the abundantC. gregaria, which fed mostly on copepod eggs during winter and fed mostly on appendicularians and copepods during summer. Prey selectivity for copepod eggs increased during winter forC. gregariaandE. indicans. Intriguingly, theoretical ingestion rates show that both species acquire similar amounts of carbon during upwelling and nonupwelling conditions. Hydromedusae’s consistent presence and predation impact across seasons may lead to significant effects in carbon and energy transfer through the NCC food web.
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