Institute of Biology, University of the Philippines Diliman, Quezon City, 1101, Philippines.
Department of Biological Sciences, College of Science, Research Center for the Natural and Applied Sciences and the Graduate School, University of Santo Tomas, Manila, 1015, Philippines.
Environ Monit Assess. 2023 Aug 29;195(9):1110. doi: 10.1007/s10661-023-11743-3.
Monitoring the ecological integrity of streams is a challenge, especially in the tropics, which experience high rates of degradation. Multimetric scoring systems have been widely used in other countries in evaluating current stream conditions; however, it has never been done in the Philippines. This study focuses on the development of a benthic macroinvertebrate-based multimetric index for the overall assessment of streams in Mt. Apo, Mindanao, Philippines. The index was used to develop existing physicochemical and biological data obtained during 2010 to 2015 surveys from 15 monitoring sites within the Mt. Apo Geothermal Project (MAGP). Metrics related to benthic macroinvertebrate abundance, richness, composition, functional habit groups, functional feeding groups, and pollution tolerance were screened for their range, temporal stability, sensitivity, discrimination efficiency (DE), redundancy, and responsiveness to anthropogenic impacts. The resulting multimetric index, the Mt. Apo Biotic Index (MABI), is computed as the sum of the individual metric scores after metric transformation using the discrete scoring method DRQ1 (D = discrete, R = reference, Q1 = 25th percentile) of the six core metrics: (1) number of Coleoptera individuals (abundance), (2) number of taxa (richness); (3) [%] Coleoptera taxa (composition), (4) number of sprawler individuals (functional habit group), (5) [%] collector-filterer taxa (functional feeding group), and (6) the Biological Monitoring Working Party Thai version (BMWP-Thai; pollution tolerance). MABI scores were classified into five condition ratings of stream biotic integrity: very poor (6 to 10), poor (11 to 15), fair (16 to 20), good (21 to 25), and excellent (26 to 30). The study demonstrated that the resulting pilot index may provide useful information that will benefit policymakers and resource managers in formulating more comprehensive stream management approaches and conservation plans for priority sites in the region.
监测溪流的生态完整性是一项挑战，尤其是在热带地区，这些地区的退化速度很快。多指标评分系统已在其他国家广泛用于评估当前溪流状况；然而，在菲律宾从未进行过此类研究。本研究专注于开发基于底栖大型无脊椎动物的多指标指数，以全面评估菲律宾棉兰老岛阿波山（Mt. Apo）的溪流。该指数用于开发现有的理化和生物学数据，这些数据是在 2010 年至 2015 年期间，从位于阿波山地热项目（MAGP）内的 15 个监测点获得的。筛选了与底栖大型无脊椎动物丰度、丰富度、组成、功能习性组、功能摄食组和耐污性相关的指标，以评估其范围、时间稳定性、敏感性、鉴别效率（DE）、冗余度以及对人为影响的响应能力。所得的多指标指数，即阿波山生物指数（MABI），是通过使用离散评分法 DRQ1（D=离散，R=参考，Q1=25 百分位数）对 6 个核心指标的个体指标得分进行转换后计算得出的，其中包括：（1）鞘翅目个体数量（丰度）；（2）分类单元数量（丰富度）；（3）鞘翅目分类单元的百分比（组成）；（4）蔓延者个体数量（功能习性组）；（5）[收集-过滤者]分类单元的百分比（功能摄食组）；以及（6）泰国生物监测工作小组版（BMWP-Thai；耐污性）。MABI 得分分为五个溪流生物完整性等级：很差（6-10）、差（11-15）、一般（16-20）、良好（21-25）和优秀（26-30）。研究表明，所产生的试验性指数可能提供有用的信息，这将有利于决策者和资源管理者制定更全面的溪流管理方法和保护计划，以保护该地区优先地点。
