Occurrence and predation by Mnemiopsis leidyi in Barnegat Bay, New Jersey

Kent Mountford
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引用次数: 38

Abstract

A late-May seed population of the ctenophore, Mnemiposis leidyi, monitored by net tow at four stations, increased from an average 0.15 m−3 to 68 m−3 in 15 days. This increase was coupled with almost complete removal of the adult copepod population, and a general depression of net zooplankton biomass. In eight days following peak density the ctenophore population had declined to 21.9 m−3, 32% of its peak level. Oscillations in ctenophore and zooplankton density suggested an equilibrium process toward late June.

With zooplankton biomass as dependent variable, data on the ctenophore population, taxonomic composition of the zooplankton and hydrography were subjected to multiple regression analysis. Calculated zooplankton biomass agreed closely with the observed means. Log10 ctenophore abundance, a measure of predator pressure, produced the greatest reduction in unexplained variation (0.01<P<0.025). The recruitment of bottom invertebrate larvae into the plankton was next most important (0.01<P<0.025). Plankton data from other years suggests this dynamic predatorprey interaction is an annual event in this barrier built estuary which is an excellent site to study the phenomenon because of a low flushing rate and the absence of ctenophore predators.

新泽西州Barnegat湾leidyi记忆藻的发生及捕食
5月下旬,4个站点的网拖监测结果显示,5月下旬毛囊虫种子数量在15天内由平均0.15 m−3增加到68 m−3。这种增加伴随着成年桡足动物种群的几乎完全消失,以及净浮游动物生物量的普遍下降。在密度高峰后的8 d内,栉水母种群数量下降至21.9 m−3,为峰值水平的32%。6月下旬前,栉水母和浮游动物密度的波动显示出一个平衡过程。以浮游动物生物量为因变量,对浮游动物种群、浮游动物分类组成和水文数据进行多元回归分析。计算出的浮游动物生物量与观测到的结果非常吻合。测量捕食者压力的栉水母丰度(Log10)对无法解释的变异减少幅度最大(0.01<P<0.025)。其次是海底无脊椎动物的幼虫被吸收到浮游生物中(0.01<P<0.025)。其他年份的浮游生物数据表明,这种动态的捕食者-猎物相互作用在这个屏障建成的河口是每年发生的事件,由于冲水量低和没有栉水母捕食者,这里是研究这种现象的绝佳地点。
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