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首页> 外文期刊>Estuarine Coastal and Shelf Science >Hourly variation of environment and copepod community of the Ganges River Estuary of India: Perspectives on sampling estuarine zooplankton
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Hourly variation of environment and copepod community of the Ganges River Estuary of India: Perspectives on sampling estuarine zooplankton

机译：印度恒河河口环境和co足类群落的每小时变化：河口浮游动物采样的观点

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High-resolution ecological databases are only rarely available for tropical estuaries, so details of their ecological variability are often poorly understood. We studied 12 h of continuous variability salinity, water temperature, pH, dissolved oxygen, NO3-N, and the copepod community (size > 200 mu m) of the Ganges River Estuary (GRE) of India. We hypothesized that short-term environmental variability affects copepod community and its most and least abundant populations. We recorded twenty-nine copepod species, in terms of size the largest was Eucalanus elongatus (3.5-5 mm) and the smallest was Oithona brevicornis (0.4-0.51 mm). Spatial variability of the environment was not statistically significant. Site-specific temporal variability of salinity, water temperature, pH and dissolved oxygen was statistically significant but only a few of those variables affected the diversity and evenness of the copepod community. Bestiolina similis and Paracalanus parvus were among the most abundant and E. elongates and Acrocaianus gibber were among the least abundant copepods of the GRE. Site-specific rank-abundance revealed that the numerical dominance of specific copepod changed within small (similar to 500 m) spatial scale. Abundant copepods were mostly omnivores; a few large ones were carnivores whereas most others including the least abundant forms were herbivores. Population abundance of B. similis remained unaffected by temporal variability of environment. Compared to day time abundance of Paracalanus parvus increased in the dark and in relatively cooler waters showing evidence of its diel vertical movements. Abundance of E. elongatus increased in higher salinity, demonstrating its affinity towards the marine environment. Abundance of A. gibber showed significant temporal associations with different environmental variables. Variability exists within the copepod community in terms of diversity, abundance, size class, and feeding habits. For a better management of the ecological resources of this estuary we suggest not to overlook microscopic ecological changes of the lower trophic levels.
机译：高分辨率的生态数据库很少能用于热带河口，因此通常对其生态变异性的细节了解甚少。我们研究了印度恒河河口（GRE）的12小时连续变化的盐度，水温，pH，溶解氧，NO3-N和the足类群落（大小大于200微米）。我们假设短期环境变化会影响co足类群落及其最多和最少的种群。我们记录了29种co足类物种，就大小而言，最大的是Eucalanus elongatus（3.5-5毫米），最小的是Oithona brevicornis（0.4-0.51毫米）。环境的空间变异性没有统计学意义。盐度，水温，pH和溶解氧的现场特定时间变异性具有统计学意义，但其中只有少数变量影响了affected足类群落的多样性和均匀性。 Bestiolina similis和Paracalanus parvus是最丰富的，而E.长形和Acrocaianus的赤嘴猴是GRE中最不丰富的co足类。特定地点的等级丰度表明，特定co足类动物的数字优势在较小（约500 m）的空间尺度内发生了变化。丰富的co足类动物大多数是杂食性的。少数食肉动物是大型食肉动物，而其他食肉动物则包括食肉动物。环境中的时间变异性不影响拟南芥的种群数量。与白天相比，在黑暗和相对凉爽的水域中，Paracalanus parvus的丰度增加，显示出其diel垂直运动的迹象。盐度高的大肠杆菌在较高的盐度下增加，表明其对海洋环境的亲和力。丰富的赤霉菌显示出与不同环境变量显着的时间相关性。 pe足类群落内部在多样性，丰度，体型和喂养习惯方面存在差异。为了更好地管理该河口的生态资源，我们建议不要忽视较低营养层的微观生态变化。

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