印度喀拉拉邦西南高止山脉Achenkovil河水质对大型底栖动物的影响

Q2 Environmental Science
Sujitha Sukumaran, Sreejai Raghavan, Beena Sarada Kurup
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引用次数: 0

摘要

摘要目的研究喀拉拉邦西南高止山脉Achenkovil河环境变量对大型底栖动物的影响。人们对许多偏远地区的水生生态系统知之甚少,至今还没有人对Achenkovil河的大型底栖动物区系进行过研究。由于大型底栖动物在底栖生物群落结构中起着重要作用,因此更好地了解它们在偏远淡水生态系统中的生态和分布模式将对更好地了解它们的功能有很大的兴趣。方法2019年2月至2020年1月,每两个月进行一次抽样。用于物理化学分析的水样装在干净的聚乙烯瓶中运到实验室。采用Van Veen grab (0.025m2)采集大型底栖动物区系。采用主成分分析等多元统计技术监测环境参数的变化。采用Simpson_1-D、shannon - H、Evenness_e^H/S和Margalef指数对大型底栖动物的多样性进行了研究。利用典型相关分析和Pearson相关分析分析了环境变量与大型底栖动物的关系。结果共鉴定出标本3563只,隶属9目32科32属32种。其次是鞘翅目和毛翅目,最不占优势的是钩翅目。1号站(S1)大型底栖动物最多,为1461 Ind/m2, 9号站(S9)最少,为37 Ind/m2。站1 (S1)是一个原始森林区域,因此这个区域被认为是参考站点。原始源林区(S1)的大型底栖动物多样性明显高于河口区(S9),是受影响最严重的区域。该地区面临着各种人为压力,导致污染和水质恶化。Achenkovil河的大型底栖生物群落结构与各种自然和人为压力引起的水质变化密切相关。结论在研究期间,该河流未受干扰的生境中,蜉蝣目、鞘翅目和毛翅目是优势类群。Chironomidae物种,特别是Chironomus属在河流中下游的优势可能是由于它们适应各种环境条件或栖息地的能力,以及它们对底泥缺氧条件下低氧含量的耐受性。旱季大型底栖动物丰度最低的是9号站(S9)。S9是一个高度受影响的区域,其特征是高温、浊度、TDS、pH、电导率、硝酸盐和磷酸盐值。因此,人为压力和环境条件的变化是影响喀拉拉邦Achenkovil河流域大型底栖动物分布的主要因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of water quality on macrobenthic fauna in Achenkovil River, Southern-Western Ghats, Kerala, India
Abstract Aim The present study investigated the influence of environmental variables on macrobenthic fauna in the Achenkovil River, Southern Western Ghats, Kerala. The knowledge of aquatic ecosystems in many remote areas is very scanty and no one has yet made an attempt to study the macrobenthic fauna of Achenkovil river. Since, macrobenthos play an important role in the benthic community structure a better knowledge of their ecology and distributional patterns in remote freshwater ecosystems would be of great interest for a better understanding of their functioning. Methods A bimonthly sampling was conducted from February 2019 to January 2020. Water samples for physicochemical analysis were carried to the laboratory in clean polyethylene bottles. The macrobenthic fauna was collected using Van Veen grab (0.025m2). Multivariate statistical technique such as Principal Component Analysis was used to monitor the variation in environmental parameters. The diversity of macrobenthic fauna was studied using Simpson_1-D, Shannon_H, Evenness_e^H/S, and Margalef’s indices. We analyzed the relationship between environmental variables and macrobenthic fauna, using Canonical Correlation Analysis and Pearson correlation. Results A total of 3563 individuals belonging to 9 orders, 32 families, 32 genera, and 32 species were identified. The most dominant order was Ephemeroptera followed by Coleoptera and Trichoptera and the least dominant was Zygoptera. The maximum number of macrobenthic fauna was observed in station 1(S1), (1461 Ind/m2) and the least in station 9 (S9), (37 Ind/m2). Station 1 (S1) is a pristine forest area, so this area is considered the reference site. The macrobenthic fauna in the pristine headwater forests (S1) was much more diverse than in the river mouth (S9) which is a highly impacted region. This region is facing various kinds of anthropogenic stress resulting in pollution and deterioration of water quality. The macrobenthic community structure in the Achenkovil River was significantly associated to the variations in water quality due to various natural as well as anthropogenic stresses. Conclusions It can be concluded that Ephemeroptera, Coleoptera, and Trichoptera were the most dominant groups in the undisturbed habitats in the river during the study period. The predominance of Chironomidae species, especially from the Chironomus genus in the midstream and downstream segments of the river is possibly due to their ability to adapt to various environmental conditions or habitats and their tolerance to the low oxygen content in anoxic conditions of the bottom sediment. The lowest abundance of macrobenthos at all the studied stations was observed at station 9 (S9) during dry seasons. S9 is a highly impacted region, characterized by high temperature, turbidity, TDS, pH, conductivity, nitrate, and phosphate values. For this reason, anthropogenic stress and changing environmental conditions are the main factors affecting the distribution of the macrobenthic fauna of the Achenkovil River basin, Kerala.
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来源期刊
Acta Limnologica Brasiliensia
Acta Limnologica Brasiliensia Environmental Science-Ecology
CiteScore
2.20
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0.00%
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17
审稿时长
50 weeks
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