Abstract
Aquatic ecosystems of highland rivers are different from those of low altitude rivers because of the specific topography and environmental parameters associated with high altitudes. Yalutsangpo, the upper course of the Brahmaputra River, is the highest major river in the world, flowing from west to east across Tibet, China and pouring into India. Macroinvertebrates were sampled from Yalutsangpo and its tributaries, the Lhasa, Niyang, and Parlong Tsangpo Rivers, from October 2009 to June 2010, to study characters of the highland aquatic ecosystem. Altogether, 110 macroinvertebrate taxa belonging to 57 families and 102 genera were identified from the basin. The biodiversity and composition of macroinvertebrate assemblages were strongly affected by altitude gradients. Local diversity represented by taxa richness and the improved Shannon-Wiener index were high at altitudes of 3,300–3,700 m, among which suitability of habitat was higher due to the better integrated environmental conditions of water temperature, dissolved oxygen, and aquatic vegetation, etc. Macroinvertebrates were grouped into shredders, scrapers, predators, collector-filterers, and collector-gatherers according to their feeding behaviors. It was found that the distributions of the functional feeding groups varied with habitat altitudes. Shredders were present at altitudes of 2,900–4,400 m, while scrapers mainly inhabited altitudes of 3,500–4,500 m, and collector-filterers preferred 3,500–4,000 m.
Even though the local taxa richness was not high at each site, the taxonomic composition and density of the assemblages varied greatly among the different sites, resulting in much higher regional diversity compared to the lowland river with similar flow and substrate conditions. The regional cumulative taxa richness of Yalutsangpo decreased and more families were lost as the altitude increased. However, some families that were newly present as the altitude increased were essential for sustaining the high regional biodiversity. The ordination diagram obtained from Detrended Correspondence Analysis indicated that altitude, river pattern, riverbed structures, bank structures, and flow conditions were the main factors that influenced the macroinvertebrate assemblages in the Yalutsangpo basin.
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Mengzhen Xu, Ph.D in Hydraulic Engineering. Dr. Xu earned her doctoral degree in 2012 from the State Key Laboratory of Hydroscience and Engineering, Tsinghua University, China. She is currently working as a post-doc in the Department of Hydraulic Engineering of Tsinghua University. Her research interests include hydraulic engineering, sediment transportation, aquatic ecology, macroinvertebrate biodiversity, mussel invasion and controlling, estuarine and coastal engineering, and integrated river management. She has published and coauthored more than 40 papers in international and Chinese journals. Dr. Xu is a member of the International Association of Hydraulic and Environmental Engineering Research (IAHR). Her coauthored paper “Effect of streambed sediment on benthic ecology, International Journal of Sediment Research” was honored with the Best Paper Award of the International Journal of Sediment Research.
Zhaoyin Wang is professor of the Department of Hydraulic Engineering of Tsinghua University and the Chairman of the Advisory Council of the International Research and Training Center on Erosion and Sedimentation (UNESCO). He was the first secretary-general and is vice president of the World Association for Sedimentation and Erosion Research (WASER). He is vice president of the International Association of Hydraulic and Environmental Engineering Research (IAHR). His research interests include sediment transportation, vegetation-erosion dynamics, river ecology and integrated river management. He has published and coauthored 320 papers in international and Chinese journals. Dr. Wang has been the chief editor of the “International Journal of Sediment Research” since 1996. He was one of the initiators of the IAHR “International Journal of River Basin Management” and is associate editor. He is a member of the steering committee of UNESCO International Sedimentation Initiative.
Baozhu Pan, Ph. D in freshwater ecology. He earned his doctoral degree in 2009 from the State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China. He is working as a researcher at the Changjiang River Scientific Research Institute, Wuhan, China. His research interests include freshwater ecology, macroinvertebrate assemblage, river restoration, ecohydrology, ecohydraulics, and integrated river management.
Guoan Yu, Ph.D in hydraulic engineering. He earned his doctoral degree in 2009 from the State Key Laboratory of Hydroscience and Engineering, Tsinghua University, China. He is working as a researcher at the Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences. His research interests include fluvial geomorphology and river dynamics, and integrated river management.
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Xu, M., Wang, Z., Pan, B. et al. The assemblage characteristics of benthic macroinvertebrates in the Yalutsangpo River, the highest major river in the world. Front. Earth Sci. 8, 351–361 (2014). https://doi.org/10.1007/s11707-014-0414-2
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DOI: https://doi.org/10.1007/s11707-014-0414-2