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Oceanographic influence on coastal zooplankton assemblages at three IMOS National Reference Stations in Western Australia
Marine and Freshwater Research ( IF 1.8 ) Pub Date : 2020-01-01 , DOI: 10.1071/mf19397
Erin McCosker , Claire H. Davies , Lynnath E. Beckley

Knowledge about the coastal zooplankton of the south-eastern Indian Ocean is limited, with few studies having compared assemblages across the latitudinal range of the western seaboard of Australia. The dominant oceanographic feature in this region is the Leeuwin Current, which transports warm, lower-salinity, tropical waters southward along the shelf-edge. This study examined data collected by Australia’s Integrated Marine Observing System at three coastal National Reference Stations located at 22°S 114°E, 32°S 115°E and 34°S 122°E. Spatial and temporal patterns in zooplankton abundance, composition and diversity were investigated, and differences in assemblage structure, particularly with respect to copepods, were related to oceanographic conditions. Clear dissimilarities among copepod assemblages were observed, becoming weaker in winter owing to enhanced connectivity of species driven by alongshore and cross-shelf transport in the Leeuwin Current. Both physical and biogeochemical factors were significant in structuring copepod assemblages, with seawater density, incorporating temperature and salinity, exerting the greatest influence. The results suggest that both broad-scale latitudinal gradients and mesoscale events contribute to variation in zooplankton assemblages in these waters. This study provides the first detailed comparison of zooplankton assemblages among the north-west, south-west and southern coastal waters of Western Australia, and enhances understanding of the processes influencing zooplankton distribution and structure.

中文翻译:

海洋学对西澳大利亚三个 IMOS 国家参考站沿海浮游动物组合的影响

关于印度洋东南部沿海浮游动物的知识有限,很少有研究比较澳大利亚西海岸纬度范围内的组合。该地区的主要海洋特征是列文洋流,它沿着陆架边缘向南输送温暖、低盐度的热带水域。这项研究检查了澳大利亚综合海洋观测系统在位于 22°S 114°E、32°S 115°E 和 34°S 122°E 的三个沿海国家参考站收集的数据。研究了浮游动物丰度、组成和多样性的时空模式,组合结构的差异,特别是桡足类,与海洋条件有关。观察到桡足类组合之间的明显差异,由于在鲁温海流中受沿岸和跨陆架运输驱动的物种之间的连通性增强,冬季变得更弱。物理和生物地球化学因素在构造桡足类组合中都很重要,海水密度、温度和盐度的影响最大。结果表明,大尺度纬度梯度和中尺度事件都有助于这些水域中浮游动物组合的变化。本研究首次对西澳大利亚西北部、西南部和南部沿海水域的浮游动物组合进行了详细比较,并加深了对影响浮游动物分布和结构的过程的了解。物理和生物地球化学因素在构造桡足类组合中都很重要,海水密度、温度和盐度的影响最大。结果表明,大尺度纬度梯度和中尺度事件都有助于这些水域中浮游动物组合的变化。本研究首次对西澳大利亚西北部、西南部和南部沿海水域的浮游动物组合进行了详细比较,并加深了对影响浮游动物分布和结构的过程的了解。物理和生物地球化学因素在构造桡足类组合中都很重要,海水密度、温度和盐度的影响最大。结果表明,大尺度纬度梯度和中尺度事件都有助于这些水域中浮游动物组合的变化。本研究首次对西澳大利亚西北部、西南部和南部沿海水域的浮游动物组合进行了详细比较,并加深了对影响浮游动物分布和结构的过程的了解。结果表明,大尺度纬度梯度和中尺度事件都有助于这些水域中浮游动物组合的变化。本研究首次对西澳大利亚西北部、西南部和南部沿海水域的浮游动物组合进行了详细比较,并加深了对影响浮游动物分布和结构的过程的了解。结果表明,大尺度纬度梯度和中尺度事件都有助于这些水域中浮游动物组合的变化。本研究首次对西澳大利亚西北部、西南部和南部沿海水域的浮游动物组合进行了详细比较,并加深了对影响浮游动物分布和结构的过程的了解。
更新日期:2020-01-01
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