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首页> 外文期刊>Lakes & Reservoirs >Distribution of macrobenthic fauna in Phawong and U-Taphao canals flowing into a lagoonal lake, Songkhla, Thailand
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Distribution of macrobenthic fauna in Phawong and U-Taphao canals flowing into a lagoonal lake, Songkhla, Thailand

机译：流入泰国泻湖的法旺和U-Taphao运河中的大型底栖动物分布

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摘要

The macrobenthic fauna of two discharge ecosystems, Phawong Canal and U-Taphao Canal flowing into Songkhla Lake in Thailand, were studied from August 1994 to August 1995. The salinity of Phawong Canal and U-Taphao Canal ranged from 0.1 to 27.8 and 0.1 to 17.0 practical salinity units (PSU), respectively. The biochemical oxygen demand (BOD) of Phawong Canal ranged from 2.5 to 33.0 mg L−1, while that of U-Taphao Canal ranged from 1.1 to 12.6 mg L−1. Temporal changes in the number of species and individuals were determined throughout a year. During the season of heavy rains (November– December), the density and number of most species decreased markedly. Only chironomid larvae increased and these were distributed in the uppermost reaches of the canals during this period. Sixty-two and 52 species of macrobenthic fauna were found in Phawong Canal and U-Taphao Canal, respectively; however, the abundance and number of species collected at each sampling was very low in the upper reaches of the canals. The most numerous benthic fauna in the Phawong Canal were polychaetes, followed by amphipods. Pelecypods and gastropods were the dominant groups in U-Taphao Canal. A distribution pattern of macrobenthic fauna associated with pollution gradients (BOD) was observed only at Phawong Canal. In addition, species diversity according to the Shannon-Wiener index only was not applicable to the assessment of benthic environmental health when the few individuals found were evenly distributed among the few species present at U-Taphao Canal. It is recommended that a coastal care project be established by the appropriate government agencies in the study areas.
机译：1994年8月至1995年8月，研究了流入泰国宋卡湖的两个排泄生态系统，旺旺运河和U-Taphao运河的大型底栖动物。旺旺运河和U-Taphao运河的盐度范围为0.1至27.8和0.1至17.0。实际盐度单位（PSU）。 Phawong运河的生化需氧量（BOD）为2.5至33.0 mg L-1，而U-Taphao运河的生化需氧量为1.1至12.6 mg L-1。全年确定物种和个体数量的时间变化。在大雨季节（11月至12月），大多数物种的密度和数量显着下降。在此期间，仅尺虫幼虫增加，并且它们分布在运河的最上游。在Phawong运河和U-Taphao运河中分别发现了62种和52种大型底栖动物。然而，在运河的上游，每次采样收集的物种数量和数量都非常低。旺（Pawong）运河中底栖动物最多的是多毛类，其次是两栖类。骨节肢动物和腹足类动物是U-Taphao运河的主要群体。仅在Phawong运河上观察到与污染梯度（BOD）相关的大型底栖动物的分布模式。另外，当发现的少数个体均匀分布在U-Taphao运河中的少数物种中时，根据香农-维纳指数的物种多样性仅不适用于底栖环境健康评估。建议由研究地区的适当政府机构建立沿海护理项目。

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