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首页> 外文期刊>Marine biology >Living in the front: Neomysis americana (Mysidacea) in the Rio de la Plata estuary, Argentina-Uruguay
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Living in the front: Neomysis americana (Mysidacea) in the Rio de la Plata estuary, Argentina-Uruguay

机译：居住在前线：阿根廷乌拉圭里约拉普拉塔河口的美洲新孢子虫（Mysidacea）

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The Rio de la Plata is one of the main estuarine systems of South America. It is characterized by a salt wedge regime, a well-developed bottom salinity front, and a maximum turbidity zone associated with it. We described, for the first time, the spatial distributional patterns of Neomysis americana, the most abundant mysid and the main food item for juvenile fishes in this estuary. We analyzed the link between mysid distribution and abundance and the bottom salinity gradient. A total of 242 plankton samples were taken from the Rio de la Plata estuary in spring and fall between 1991 and 2001. Bottom salinity gradient was quantified from grids created on the basis of 348 oceanographic stations. The N, americana population was characterized by high abundances (up to 2500 ind. m~(-3)), with juveniles, males, gravid and non-gravid females present in both spring and fall of different years. N. americana distribution followed the position of the bottom salinity front in different years and seasons. Pearson's correlation analysis between mysid abundance and bottom salinity gradient confirmed the association of mysids with the bottom salinity front (maximum salinity gradient). No correlation was detected between mysid abundance and salinity per se or temperature (neither in spring nor in fall). We speculate that mysids concentrated at the front could take advantage of the high concentration of detrital material for feeding. The results of our work highlight the importance of the magnitude of salinity gradient for the ecological processes of a salt-wedge estuary like the Rio de la Plata. The analysis of the spatial distribution of gradient values presented in this work also constitutes a useful tool to locate key ecological areas such as fronts.
机译：拉普拉塔河（Rio de la Plata）是南美的主要河口系统之一。它的特征是盐楔区，发育良好的底部盐度前沿和与其相关的最大浊度区。我们首次描述了美国河蟹线虫（Neomysis americana）的空间分布格局，该河口是鱼类中最丰富的鱼类和主要食物。我们分析了mysid分布和丰度与底部盐度梯度之间的联系。在1991年至2001年的春季和秋季之间，从里约热内卢河口总共采集了242个浮游生物样品。底部盐度梯度是根据在348个海洋观测站的基础上建立的网格进行定量的。美洲北美洲种群的特征是丰度很高（高达2500 ind。（-3）），在不同年份的春季和秋季都有幼体，雄性，妊娠和非重度雌性。在不同年份和季节，美洲猪笼草的分布均遵循底部盐度前沿的位置。迈斯德丰度与底部盐度梯度之间的Pearson相关分析证实了迈斯德与底部盐度前沿（最大盐度梯度）之间的关联。没有检测到象鼻虫的丰度与本身的盐度或温度（春季或秋季）之间的相关性。我们推测，聚集在前部的类固醇可以利用高浓度的碎屑物质喂养。我们的工作结果突显了盐度梯度的大小对于像里约热内卢这样的盐楔河口生态过程的重要性。对这项工作中提出的梯度值的空间分布的分析也构成了定位关键生态区域（如前沿）的有用工具。

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