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首页> 外文期刊>Estuarine Coastal and Shelf Science >Assessment of surf zone zooplankton dynamics in a Southwestern Atlantic sandy beach: Seasonal cycle and tidal height influence
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Assessment of surf zone zooplankton dynamics in a Southwestern Atlantic sandy beach: Seasonal cycle and tidal height influence

机译：西南大西洋沙滩冲浪区浮游动物动力学评估：季节性周期和潮汐高度影响

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Surf zones of sandy beaches are poorly studied in comparison to estuarine and continental shelf waters, specifically because of the difficulties experienced in sampling in high-energy environments. The zooplankton of these areas, therefore, has received less attention than that in other coastal systems. The aim of this study was to investigate the seasonal patterns and tidal height effects (high tide/low tide) on the surf zooplankton community in a temperate Southwestern Atlantic sandy beach. We also aimed to evaluate the influence of some environmental variables (water temperature, salinity, chlorophyll-a, suspended particulate matter and particulate organic carbon) on the community structure and to compare the surf community to nearby coastal zone (< to 50 m). Sampling was carried out from September 2009 to November 2010, with a monthly frequency during autumn-winter and bi-monthly during spring-summer. All samples were collected in a fixed station during high and low tide, using a conical net with a 300 pm mesh size. The net was hand-pulled parallel to the cost across 200 m, for 15-20 min. Surf waters hosted a very rich zooplanktonic community that were numerically dominated by crustaceans (30-99% of total abundance), especially two calanoid copepods: Acartia tonsa and Paracalanus parvus. The apparent low phytoplankton production detected in surf waters would be compensated by large quantities of detritus and suspended matter that could be an alternative food source for copepods that inhabit surf waters. Total abundances exhibited a strong seasonal variation, ranging from 2.42 (Spring, 2009) to 11076.9 ind. m(-3) (Autumn, 2010). The tidal height was not a significant source of zooplankton variation, probably other factors are more influential at this short-term time scale. Surf waters were inhabited by a typical zooplanktonic community, coexisting both estuarine and neritic organisms. Most of the observed species were similar to those described for coastal waters, but others like A. tonsa were practically restricted to this particular zone. Water temperature, in combination with suspended particulate matter and chlorophyll-a, explained the observed temporal zooplankton pattern. Results obtained in this study highlight the importance of the surf waters of sandy beaches and will be useful for further studies and/or monitoring programs conducted in similar high-energy, turbulent, and turbid ecosystems.
机译：与河口和大陆架水域相比，沙滩冲浪区的研究较少，特别是因为在高能环境中采样困难。因此，与其他沿海系统相比，这些地区的浮游动物受到的关注较少。这项研究的目的是调查温带西南大西洋沙滩浮游冲浪浮游生物群落的季节性模式和潮高影响（高潮/低潮）。我们还旨在评估某些环境变量（水温，盐度，叶绿素-a，悬浮颗粒物和颗粒有机碳）对群落结构的影响，并将冲浪群落与附近的海岸带（<至50 m）进行比较。采样时间为2009年9月至2010年11月，秋冬季每月一次，春夏季每月两次。在涨潮和退潮期间，所有样本均使用网眼大小为300 pm的圆锥形网收集在固定站中。将网平行于200 m的成本手动拉网15-20分钟。冲浪水域拥有一个非常丰富的浮游动物群落，在数量上以甲壳类动物为主（占总丰度的30-99％），尤其是两个cal足类pe足类动物：A螨（Acartiatona）和小Para（Paracalanus parvus）。在冲浪水中发现的明显的浮游植物产量低将被大量碎屑和悬浮物所补偿，这些碎屑和悬浮物可以作为居住在冲浪水中的co足类的替代食物来源。总的丰度表现出强烈的季节性变化，范围从2.42（春季，2009年）到11076.9英寸。 m（-3）（2010年秋）。潮高不是浮游动物变化的重要来源，可能在此短期时间范围内其他因素的影响更大。潮水被一个典型的浮游动物群落居住，并存有河口生物和蠕虫生物。观察到的大多数物种与沿海水域中描述的物种相似，但其他物种（如A.tonsa）实际上仅限于该特定区域。水温，与悬浮颗粒物和叶绿素-a结合，解释了所观察到的时间浮游动物模式。这项研究获得的结果凸显了沙滩冲浪水的重要性，并将有助于在类似的高能，湍流和浑浊的生态系统中进行进一步的研究和/或监测程序。

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