Copepods key traits in diverse habitats of tropical waters
Copepods key traits in diverse habitats of tropical waters
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热带水域不同栖息地的桡足类关键特征
DOI：
10.1093/plankt/fbab088
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发表时间：
2022
影响因子：
2.1
通讯作者：
Nguyen-Ngoc, Lam
中科院分区：
文献类型：
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作者：
Doan-Nhu, Hai;Nguyen, Tam-Vinh;Do-Huu, Hoang;Montoya, Joseph P;Nguyen-Ngoc, Lam
桡足类是主要的海洋浮游动物，在海洋食物网中起着重要的作用。然而，桡足动物的特征在许多水域尚未被研究。基于2016年西南季风期湄公河和越南南部沿海上升流对桡足动物群落的功能特征研究。分析了桡足类数据的4个关键功能性状（营养类群、摄食类型、繁殖策略和日迁移）的14个性状类别，探讨了环境梯度对其在湄公河（MKW）、上升流（UpW）、近岸（OnSW）和近海（OSW） 4种生境中的分布和丰度的影响。通过对研究水域139种桡足动物的分布、丰度和性状的多重对应分析，鉴定出7个官能团。草食性、水流摄食性和产卵性桡足类在所有生境中均占优势，浅海海域的丰度最高。其中，MKW和UpW以草食性物种为主，OnSW和OSW以杂食性物种为主。在所有生境中，产卵者均占主导地位，但从MKW和UpW到OnSW逐渐减少，OSW最低。在UpW，游弋捕食者的数量是伏击捕食者的2倍，而在其他栖息地则相反。结果表明，湄公河和沿海上升流的影响导致了不同的桡足类组合，具有特定的功能特征。
Copepods are the dominant marine zooplankton and perform important functions in the marine food web. However, copepod traits have not been studied in many waters. We studied the copepod community under influence of the Mekong River and the Southern Vietnamese coastal upwelling, based on their functional traits, during the southwest monsoon period in 2016. Fourteen trait categories of four key functional traits (trophic-groups, feeding-types, reproductive-strategies and diel migration) of copepod data were analyzed to investigate how environmental gradients impact on their distribution and abundance among the four defined habitats: Mekong River (MKW), upwelling (UpW), nearshore (OnSW) and offshore waters (OSW). There were seven functional groups identified in the study waters based on multiple correspondence analysis of distribution, abundance and traits of 139 copepod species. Herbivorous, current-feeding and sac-spawning copepods were dominant in all habitats with the highest abundance in OSW. Specifically, herbivorous species dominated in MKW and UpW, whereas omnivorous species dominated in OnSW and OSW. Sac-spawners dominated in all habitats, but decreased from MKW and UpW to OnSW and lowest in OSW. Cruise feeders were 2-fold higher than ambush feeders in the UpW, but the opposite was observed in the other habitats. The results suggest that impacts of Mekong River and coastal upwelling led to distinctive copepod assemblages with specific functional traits.