https://scholars.lib.ntu.edu.tw/handle/123456789/573350
標題: | Rice paddy irrigation seasonally impacts stream benthic macroinvertebrate diversity at the catchment level | 作者: | CHIA-YING KO Asano, Satoshi Lin, Meng-Ju Ikeya, Tohru Peralta, Elfritzson M. Triño, Ellis Mika C. Uehara, Yoshitoshi Ishida, Takuya Iwata, Tomoya Tayasu, Ichiro Okuda, Noboru |
關鍵字: | benthic macroinvertebrates; catchment and watershed management; land use; rice paddy; structural equation modeling | 公開日期: | 2021 | 卷: | 12 | 期: | 5 | 來源出版物: | Ecosphere | 摘要: | Agriculture is one of the most critical anthropogenic disturbances to freshwater ecosystems globally. In monsoon Asia, rice paddies provide habitats for aquatic species, but how their associated irrigation systems can affect downstream ecosystems is poorly understood. Here, we used structural equation modeling (SEM) to estimate seasonal variations in benthic macroinvertebrate diversity and environments and quantified indirect effects of land use, especially of rice paddy areas, on benthic macroinvertebrate diversity through local environmental alteration. Our study site was the Yasu River tributary of Lake Biwa, Japan, and we performed our investigation during both irrigation and nonirrigation periods, representing different seasons. Seasonal variations in physical and chemical variables and diversity were observed. Seasonal particulate phosphorus concentrations to a large extent determined the abundance and community composition of benthic macroinvertebrates. SEM revealed that the proportions of forest, urban, and rice paddy areas in the catchment had significant indirect effects on biodiversity indices of local benthic macroinvertebrate communities. The proportion of forest area had robust negative effects on water temperature, but the overall indirect effects on the macroinvertebrate diversity contrasted between the two seasonal periods. The proportion of rice paddy area had a strongly negative indirect effect on the diversity through increased particulate phosphorous loading during the irrigation period, while the proportion of urban area had a significantly negative indirect effect during the nonirrigation period only. The seasonal negative impacts of rice paddy irrigation on benthic macroinvertebrate communities were possibly due to siltation arising from rice paddy soils. Our results have implications for environmental restoration and biodiversity conservation in catchment management. ? 2021 The Authors. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85106959906&doi=10.1002%2fecs2.3468&partnerID=40&md5=9dd88a20aed94869bd5cd7598d72f29a https://scholars.lib.ntu.edu.tw/handle/123456789/573350 |
ISSN: | 21508925 | DOI: | 10.1002/ecs2.3468 |
顯示於: | 漁業科學研究所 |
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