ABSTRACT

Industrial zones have been key drivers of growth across Asia but are also the source of water quality deterioration in surrounding rivers and streams. This study examined the effects of industrial zone located at the San Cristobal sub-catchment of Laguna de Bay, the Philippines on the spatiotemporal variation in water quality and benthic macroinvertebrate communities. Sampling sites were established in upstream and downstream sections of two tributaries of San Cristobal River, and the main channel of Diezmo River, and were sampled in 2018 during dry (February and April) and rainy (June and October) seasons. Results showed significant spatial difference with declining water quality (low dissolved oxygen; high levels of ammonia-nitrogen, phosphate-phosphorus, and total suspended solids) at the downstream sites. Consequently, benthic macroinvertebrates responded via change in community structure and composition (decline in pollution-sensitive taxa from upstream through downstream) to water quality degradation related to industrial land use downstream. Furthermore, seasonal variation was observed in benthic macroinvertebrate communities due to the absence of spate-induced disturbance, allowing benthic macroinvertebrates to proliferate in the rainy season. Findings of this study reveal that benthic macroinvertebrates can be used as bioindicators in the evaluation of the ecological integrity of surface river and stream systems that pass through industrial zones.

摘要

工业区一直是整个亚洲增长的主要驱动力，但也是周围河流和溪流水质恶化的根源。这项研究检查了位于菲律宾拉古纳德湾圣克里斯托瓦尔流域的工业区对水质和底栖大型无脊椎动物群落的时空变化的影响。在圣克里斯托瓦尔河的两个支流的上游和下游部分以及迪耶斯莫河的主要河道均建立了采样地点，并于2018年的旱季（2月和4月）和雨季（6月和10月）进行了采样。结果显示，下游站点的水质下降（溶解氧低；氨氮，磷酸盐-磷和总悬浮固体含量高），空间差异显着。最后，底栖大型无脊椎动物通过改变群落结构和组成（对污染敏感的分类单元从上游到下游的下降）来应对与下游工业用地有关的水质下降。此外，由于没有潮汐引起的干扰，在底栖大型无脊椎动物群落中观察到季节性变化，使底栖大型无脊椎动物在雨季繁殖。这项研究的结果表明，底栖大型无脊椎动物可以用作生物指标，以评估流经工业区的表层河流和溪流系统的生态完整性。此外，由于没有潮汐引起的干扰，在底栖大型无脊椎动物群落中观察到季节性变化，使底栖大型无脊椎动物在雨季繁殖。这项研究的结果表明，底栖大型无脊椎动物可以用作生物指标，以评估流经工业区的表层河流和溪流系统的生态完整性。此外，由于没有潮汐引起的干扰，在底栖大型无脊椎动物群落中观察到季节性变化，使底栖大型无脊椎动物在雨季繁殖。这项研究的结果表明，底栖大型无脊椎动物可以用作生物指标，以评估流经工业区的表层河流和溪流系统的生态完整性。