Cladoceran communities in offshore Suruga Bay, Japan: How are they formed?
Cladoceran communities in offshore Suruga Bay, Japan: How are they formed?
复制标题
日本骏河湾近海的枝角类群落：它们是如何形成的？
DOI：
10.1007/s10872-022-00662-5
复制
发表时间：
2022
影响因子：
2.3
通讯作者：
Nishikawa Jun
中科院分区：
文献类型：
--
作者：
Kenmochi Akiyuki;Takahashi Daisuke;Matsuura Hiroyuki;Yoshikawa Takashi;Sohrin Rumi;Obayashi Yumiko;Kuroda Hiroshi;Nishikawa Jun
虽然海洋枝洋类被称为沿海浮游动物，但它们有时会大量出现在近海水域。在骏河湾，位于日本的中心，向太平洋开放，在春季和夏季，在近海水域有大量的枝海动物。然而，这些近海种群在海湾中形成的机制仍然未知。本研究的目的是通过现场采样和数值实验相结合，利用粒子跟踪方法，澄清解释这些近海枝海种群的因素。支大洋类在沿海和近海呈现出不同的分布格局。滨岸优势种鸟鞭草（penilia avirostris）的丰度在近海区明显高于沿海区。独特的pe滤料。病毒进化可能使它能够在食物不那么丰富的骏河湾生存。另一方面，在沿海地区大量出现多角蛇和白角蛇，而在近海地区出现的数量很少。这表明近海环境不利于它们维持种群数量。粒子跟踪实验表明，从骏河湾海岸释放的粒子在3 - 8月期间被输送到骏河湾内近海区域并在湾内近海区域积累。这些模式在其他月份没有观察到。我们的研究结果表明，表层环流对沿海种群的迁移和该物种在低营养和高盐度近海环境中生存的生物学特性的结合，有助于在鹤河湾近海形成周期性的枝海洋群。
Although marine cladocerans are known as coastal zooplankton, they sometimes appear in offshore waters in large numbers. In Suruga Bay, located in the center of Japan and opens to the Pacific Ocean, cladocerans occur abundantly in offshore waters during the spring and summer seasons. However, the mechanisms by which these offshore populations form in the bay are still unknown. The aim of this study was to clarify the factors that explain these offshore cladoceran populations by combining field sampling and numerical experiments, using particle-tracking methods. Cladocerans showed different occurrence patterns in coastal and offshore areas. Abundance ofPenilia avirostris, the dominant offshore species, was much higher in offshore than in coastal areas. The unique filter feeding ofPe. avirostrismay enable it to survive in offshore Suruga Bay with less abundant food conditions. On the other hand, whilePleopis polyphemoidesandPodon leuckartiioccurred abundantly in coastal areas, they appeared in very small numbers in offshore areas. This suggests that offshore environments are unfavorable for them to maintain populations. Particle-tracking experiments demonstrated that particles released from the coast of Suruga Bay were transported to and accumulated at the inner offshore region of the Bay from March to August. Those patterns were not observed in other months. Our results suggest that a combination of transport of coastal populations by surface circulation currents and biological characteristics of the species to survive in oligotrophic and high-salinity offshore environments contribute to form periodic mass occurrences of cladocerans in offshore Suruga Bay.