title: Using benthic macroinvertebrate and fish communities as bioindicators of the Tanshui River basin around the greater Taipei area - multivariate analysis of spatial variation related to levels of water pollution.
abstract: After decades of strict pollution control and municipal sewage treatment, the water quality of the Tanshui River increased significantly after pollution mitigation as indicated by the River Pollution Index (RPI). The pollution level of the estuarine region decreased from severe pollution to mostly moderately impaired. The most polluted waters are presently restricted to a flow track length between 15-35 km relative to the river mouth. From July 2011 to September 2012, four surveys of fish and benthic macroinvertebrates were conducted at 45 sampling sites around the Tanshui River basin. The pollution level of all the study area indicated by the RPI could also be explained by the Family Biotic Index (FBI) and Biotic Index (BI) from the benthic macroinvertebrate community, and the Index of Biotic Integrity (IBI) of the fish community. The result of canonical correlation analysis between aquatic environmental factors and community structure indicated that the community structure was closely related to the level of water pollution. Fish species richness in the estuarine area has increased significantly in recent years. Some catadromous fish and crustaceans could cross the moderate polluted water into the upstream freshwater, and have re-colonized their populations. The benthic macroinvertebrate community relying on the benthic substrate of the estuarine region is still very poor, and the water layer was still moderately polluted.
authors.affiliation: Department of Applied Science, National Hsinchu University of Education, 521 Nan-Da Rd. Hsinchu, 300, Taiwan. shuh@mail.nhcue.edu.tw.
authors.forename: Shuh-Sen
authors.initials: SS
authors.lastname: Young
authors.affiliation: Environmental Analysis Laboratory, Environmental Protection Administration, Executive Yuan, 260 Minzu Rd. Section 3, Zhongli City Taoyuan County 32024, Taiwan. hnyang@mail.niea.gov.tw.
authors.forename: Hsi-Nan
authors.initials: HN
authors.lastname: Yang
authors.affiliation: Department of Environmental Resource Management, Chia-Nan University of Pharmacy and Science, 60 Er-Ren Rd. Section 2, Ren-De Division, 71710 Tainan City, Taiwan. daji@ms19.hinet.net.
authors.forename: Da-Ji
authors.initials: DJ
authors.lastname: Huang
authors.affiliation: Environmental Analysis Laboratory, Environmental Protection Administration, Executive Yuan, 260 Minzu Rd. Section 3, Zhongli City Taoyuan County 32024, Taiwan. hnyang@mail.niea.gov.tw.
authors.forename: Su-Miao
authors.initials: SM
authors.lastname: Liu
authors.affiliation: Department of Applied Science, National Hsinchu University of Education, 521 Nan-Da Rd. Hsinchu, 300, Taiwan. maoluffy@hotmail.com.
authors.forename: Yueh-Han
authors.initials: YH
authors.lastname: Huang
authors.affiliation: Department of Applied Science, National Hsinchu University of Education, 521 Nan-Da Rd. Hsinchu, 300, Taiwan. chargy0127@gmail.com.
authors.forename: Chung-Ting
authors.initials: CT
authors.lastname: Chiang
authors.affiliation: Department of Applied Science, National Hsinchu University of Education, 521 Nan-Da Rd. Hsinchu, 300, Taiwan. sdfvgsdfvg@gmail.com.
authors.forename: Jin-Wei
authors.initials: JW
authors.lastname: Liu
mesh_terms: D000818:Animals; D044822:Biodiversity; D002681:China; D004784:Environmental Monitoring / Q000379:methods* / Q000706:statistics & numerical data; D005399:Fishes; D007448:Invertebrates; D015999:Multivariate Analysis; D045483:Rivers; D062206:Spatial Analysis; D014876:Water Pollution