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首页> 外文期刊>Polar biology >Mesozooplankton succession in a sub-Antarctic bay (Beagle channel, Southern tip of South America): distinctive annual patterns between two environmentally different zones
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Mesozooplankton succession in a sub-Antarctic bay (Beagle channel, Southern tip of South America): distinctive annual patterns between two environmentally different zones

机译：Mesozooplankton在南极湾（南美洲南端猎犬渠道）的继承：两个环境不同的区域之间的独特年度模式

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摘要

Frequent sampling of zooplankton is essential to understand their annual dynamics. However, in polar and subpolar ecosystems, such sampling is rare. This study comparatively analysed, for the first time, the annual mesozooplankton succession in the northwest nearshore and external zones of Ushuaia Bay in the sub-Antarctic Beagle Channel by monthly sampling over two years. The nearshore zone, with shallow waters and strong continental and anthropogenic influence, was characterised by the year-round occurrence of the euryhaline copepodEurytemoraamericanaand adventitious taxa. The mesozooplankton community exhibited pronounced monthly and year-to-year variability but, as a general seasonal trend, winter assemblages were dominated by the copepodOithona similisand adventitious nematodes, whereas the spring-summer ones were dominated byE. americana, the cladoceranPodon leuckartiand Cirripedia nauplii. In the external zone, the copepodsDrepanopus forcipatusandCtenocalanus citerwere found throughout the year. The annual succession showed a clearer seasonal pattern. Main shifts in community structure occurred in late winter-spring and late summer-autumn, when a high representation of meroplankton and appendicularians was closely associated with phytoplankton blooms. The higher temporal variability in the nearshore community was partially related to variable contributions of adventitious taxa to assemblage composition and may be also reflecting stressful conditions for plankton species linked to freshwater and urban discharges reported within the bay. This study allowed filling the temporal gaps in previous research and providing a more complete picture of the annual mesozooplankton dynamics in the Beagle Channel, generating hypotheses at the community and population levels for future research.
机译：尊敬的浮游动物采样对于了解其年度动态至关重要。然而，在极性和亚极生态系统中，这种采样是罕见的。本研究比较分析了，首次在西北近岸和乌斯康湾的西北近岸和外部地区的年度中部，每月抽样超过两年时间。近海区，具有浅水区和强大的欧陆​​和人为影响，其特征在于Euryhaline Copepodeurytemoraamericananand Adventituity Taxa的全年发生。 Mesozooplankton社区展示了明显的月度和年度变异性，但作为一般季节性趋势，冬季大会由Copepodoithona Similisand Adferative Nematodes主导，而春夏是由再见的。 Americana，CladoceranPodon Leuckartiand Cirripedia Nauplii。在外部区域，Copepodsdrepanopus forcipatusandctenocalanus坐在一年中发现。年度继承表明了更清晰的季节性模式。当Meroplankton和阑尾的高代表与Phytoplankton Blooms密切相关时，冬季春季和晚秋季的社区结构中的主要变化发生在冬季春季和夏季秋季。近岸社区的较高的时间变异性与各种征集组合物的可变贡献部分有关，也可能还反映了与淡水中报告的淡水和城市排放相关的浮游生物物种的压力条件。本研究允许填补以前的研究中的时间差距，并在比格犬的年度Mesozooplankton动力学中提供更完整的图片，在社区和未来的研究中产生假设和人口水平。

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