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首页> 外文期刊>Estuarine Coastal and Shelf Science >Contrasting structural patterns of the mesozooplankton community result from the development of a frontal system in San Jose Gulf, Patagonia
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Contrasting structural patterns of the mesozooplankton community result from the development of a frontal system in San Jose Gulf, Patagonia

机译：中生浮游动物群落的不同结构模式是由巴塔哥尼亚圣何塞湾的额叶系统的发展引起的

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摘要

The structural patterns of the mesozooplankton community of San Jose Gulf (SJG), a one of a kind semi enclosed basin located in the northern margin of the Valdes Peninsula (Argentine Patagonia), were studied by means of semi-automatic image analysis. Samples were obtained bimonthly during the warm season (October 2012 April 2013) at stations distributed on a regular grid. Cluster analyses outlined two spatially consistent groups of stations showing similar patterns when based on physical (SST, Chl-a, and bottom depth) and community structure (abundance, biomass, and slope of the size spectra) descriptors, each broadly distributed on one of two previously described hydrographic domains formed by the interaction of tidal circulation, coastal morphology, bottom topography, and seasonal vertical stratification. Examination of the slope of the mesozooplankton size spectra revealed that the stratified waters of the East Domain sustain higher proportions of small organisms and higher biomass, suggesting potentially low trophic transfer efficiency compared to its vertically-mixed West counterpart. Three clustering analyses resulted in still spatially consistent groups of stations when based on the community descriptors, revealing the existence of a transition zone, presumably resulting from intermediate hydrodynamic conditions. Principal component analysis revealed that biomass of cladocerans modulates the size spectra and is related with distances from sampling stations to SJG's mouth. Overall, a consistent spatial correlate was found between physical conditions of water masses and the structure of the mesozooplancton community contained within. (C) 2017 Elsevier Ltd. All rights reserved.
机译：通过半自动图像分析研究了圣何塞海湾（SJG）的中型浮游生物群落的结构模式，SJG是位于瓦尔德斯半岛（阿根廷巴塔哥尼亚）北缘的一种半封闭盆地之一。在温暖季节（2012年10月，2012年10月，2013年10月），每两个月从常规网格中的站点中获取样本。聚类分析概述了两个空间一致的站组，这些站基于物理（SST，Chl-a和底部深度）和群落结构（丰度，生物量和尺寸谱的斜率）描述符显示相似的模式，每个描述符广泛分布在以下一个由潮汐环流，海岸形态，底部地形和季节性垂直分层相互作用形成的两个先前描述的水文地理域。对中层浮游生物大小谱图的斜率进行检查后发现，东域的分层水域维持着较高比例的小型生物和较高的生物量，与垂直混合的西域相比，其营养传递效率可能较低。当基于群落描述子时，三个聚类分析导致空间站组在空间上仍然一致，揭示了过渡带的存在，大概是由于中等水动力条件造成的。主成分分析表明，锁骨的生物量调节大小光谱，并且与从采样站到SJG口的距离有关。总体而言，在水团的物理条件与其中所包含的中小球藻群落的结构之间发现了一致的空间相关性。 （C）2017 Elsevier Ltd.保留所有权利。

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