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首页> 外文期刊>Limnologica >Nutrient loadings and deforestation decrease benthic macroinvertebrate diversity in an urbanised tropical stream system
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Nutrient loadings and deforestation decrease benthic macroinvertebrate diversity in an urbanised tropical stream system

机译：营养负荷和森林砍伐在城市化的热带流系统中降低了底栖大型幽默多样性

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摘要

Lotic ecosystems in urban areas are severely impacted by anthropogenic environmental stressors, such as deforestation and nutrient pollution, due to socioeconomic activities in the catchment. To work out measures for identification and mitigation of concurrent multiple stressors to a stream system, it is necessary to assess the relative importance of impacts by the individual stressors. Here we aimed to discriminate the covarying effects of nutrient pollution and deforestation on benthic macroinvertebrate communities in an urbanised tropical stream system. In the Silang-Santa Rosa Subwatershed (SSRS) of Laguna de Bay, benthic macroinvertebrates and physicochemical environments were investigated at 13 sites varying in human population density, riparian canopy, and land-use pattern as indicated by geographic information systems in the catchment. Regression and multivariate analyses were performed to identify the drivers of the biodiversity loss and understand its underlying mechanisms. In the SSRS, where rapid economic growth took place without updating poorly installed wastewater treatment plants (WWTPs), domestic activity indicated by human population density in the catchment was the primary factor in generating heavy phosphorous loadings (mean total phosphorus = 0.91; range = 0-1.50 mg/l) that caused hypoxia (mean dissolved oxygen = 2.98; range = 0.13-6.27 mg/l) in stream waters and subsequently reduced macroinvertebrate diversity (mean H' = 0.91; SD +/- 0.61). Nutrient and organic pollution and riparian deforestation explained 53.5% and 9.7% of the variation of benthic macroinvertebrate communities in SSRS, respectively. Given such scenario, additional WWTPs servicing urban developments and improved riparian canopy cover in the SSRS can be both strategic and cost-effective in the initial steps of environmental mitigation in urbanised streams, especially in rapidly developing countries.
机译：由于集水区的社会经济活动，城市地区的巨大生态系统受到人为环境压力源严重影响，例如森林植物环境压力源，例如森林砍伐和营养污染。为了解决流系统的识别和减轻并发多个压力源的衡量措施，有必要评估个体压力源的影响的相对重要性。在这里，我们旨在区分营养污染和森林植物在城市化的热带流系统中对底栖大型物流社区的联合效应。在Laguna de Bay的Silang-Santa Rosa河口（SSRS），在人口密度，河岸冠层和土地使用模式中，在13个点调查了Benthic Macroinvertebrate和物理化学环境，如集水区的地理信息系统所示。进行回归和多变量分析，以确定生物多样性损失的驱动因素，并了解其潜在机制。在SSRS中，在没有更新未更新的废水处理植物（WWTPS）的情况下发生的快速经济增长（WWTPS），集水区中人口密度表明的国内活动是产生重重磷载量的主要因素（平均总磷= 0.91;范围= 0 -1.50 mg / l）导致缺氧（平均溶解氧= 2.98;范围= 0.13-6.27mg / l），随后减少了大型蠕虫物分集（平均值H'= 0.91; SD +/- 0.61）。营养和有机污染和河岸森林砍伐分别解释了SSRS中底栖大型椎体社区的53.5％和9.7％。考虑到这种情况，在城市化溪流环境减缓的初步步骤中，额外的WWTPS维修城市发展和改善的河岸天津覆盖覆盖可以是战略性的，并且在迅速发展中国家的环境缓解的初步步骤中。

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