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Ecological condition, biodiversity and major environmental challenges in a tropical river network in the Bago District in South-central Myanmar: first insights to the unknown
Limnologica ( IF 1.7 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.limno.2020.125835
Tor Erik Eriksen , Nikolai Friberg , John E. Brittain , Geir Søli , Andreas Ballot , Eirin Årstein-Eriksen , Tomas Adler Blakseth , Hans Fredrik Veiteberg Braaten

Abstract Freshwater ecosystems in the Indo-Burma biodiversity hotspot face immediate threats through habitat loss and species extinction. Systems to monitor ecological status and trends in biodiversity are therefore crucially needed. Myanmar is part of Indo-Burma but with no past experience of biomonitoring in freshwaters. In this study, we aimed to assess the ecological and biodiversity status of a lowland river network in south-central Myanmar by identifying and quantifying pressures using macroinvertebrates as bioindicators. Novel data on water quality (nutrients, sediments and metals), hydromorphology (Morphological Quality Index; MQI), habitat quality (Litter-Siltation Index; LSI), land use, and macroinvertebrates were collected from 25 river sites. The dominant pressures on rivers were urban land use, inputs of untreated sewage, in-stream and riparian garbage littering, run-off from agricultural fields and plantations, as well as physical habitat degradation. Water chemistry data indicated inputs of sediments and nutrients to degraded streams, but no obvious metal pollution. The LSI and MQI indices indicated high perturbation in agricultural and urban areas, respectively. Ecological status was assessed using a first version of a modified Average Score per Taxon index (ASPT), while biodiversity was assessed by family richness within the orders Ephemeroptera, Plecoptera, Trichoptera, Coleoptera and Odonata (EPTCO), which was tested against the pressure gradient by principal component regressions. ASPT had high diagnostic capabilities (R2 = 0.68, p

中文翻译:

缅甸中南部勃固区热带河流网络的生态状况、生物多样性和主要环境挑战:对未知事物的初步了解

摘要 印缅生物多样性热点地区的淡水生态系统面临栖息地丧失和物种灭绝的直接威胁。因此,迫切需要监测生物多样性生态状况和趋势的系统。缅甸是印缅的一部分,但过去没有在淡水中进行生物监测的经验。在这项研究中,我们旨在通过使用大型无脊椎动物作为生物指标识别和量化压力来评估缅甸中南部低地河流网络的生态和生物多样性状况。从 25 个河流站点收集了关于水质(营养物、沉积物和金属)、水形态学(形态质量指数;MQI)、栖息地质量(凋落物淤积指数;LSI)、土地利用和大型无脊椎动物的新数据。河流面临的主要压力是城市土地利用、未经处理的污水输入、河流和河岸垃圾乱扔垃圾、农田和种植园的径流以及自然栖息地退化。水化学数据表明沉积物和养分向退化的河流输入,但没有明显的金属污染。LSI 和 MQI 指数分别表明农业和城市地区的高扰动。生态状况是使用修改后的每个分类单元平均得分指数 (ASPT) 的第一个版本进行评估的,而生物多样性则是通过对压力梯度进行测试的蜉蝣目、鳞翅目、毛翅目、鞘翅目和蜻蜓目 (EPTCO) 内的家族丰富度进行评估通过主成分回归。ASPT 具有很高的诊断能力(R2 = 0.68,p 水化学数据表明沉积物和养分向退化的河流输入,但没有明显的金属污染。LSI 和 MQI 指数分别表明农业和城市地区的高扰动。生态状况是使用修改后的每个分类单元平均得分指数 (ASPT) 的第一个版本进行评估的,而生物多样性则是通过对压力梯度进行测试的蜉蝣目、鳞翅目、毛翅目、鞘翅目和蜻蜓目 (EPTCO) 内的家族丰富度进行评估通过主成分回归。ASPT 具有很高的诊断能力(R2 = 0.68,p 水化学数据表明沉积物和养分向退化的河流输入,但没有明显的金属污染。LSI 和 MQI 指数分别表明农业和城市地区的高扰动。生态状况是使用修改后的每个分类单元平均得分指数 (ASPT) 的第一个版本进行评估的,而生物多样性则是通过对压力梯度进行测试的蜉蝣目、鳞翅目、毛翅目、鞘翅目和蜻蜓目 (EPTCO) 内的家族丰富度进行评估通过主成分回归。ASPT 具有很高的诊断能力(R2 = 0.68,p 生态状况是使用修改后的每个分类单元平均得分指数 (ASPT) 的第一个版本进行评估的,而生物多样性则是通过对压力梯度进行测试的蜉蝣目、鳞翅目、毛翅目、鞘翅目和蜻蜓目 (EPTCO) 内的家族丰富度进行评估通过主成分回归。ASPT 具有很高的诊断能力(R2 = 0.68,p 生态状况是使用修改后的每个分类单元平均得分指数 (ASPT) 的第一个版本进行评估的,而生物多样性则是通过对压力梯度进行测试的蜉蝣目、鳞翅目、毛翅目、鞘翅目和蜻蜓目 (EPTCO) 内的家族丰富度进行评估通过主成分回归。ASPT 具有很高的诊断能力(R2 = 0.68,p
更新日期:2021-01-01
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