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Frontiers of Earth Science

ISSN 2095-0195

ISSN 2095-0209(Online)

CN 11-5982/P

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2018 Impact Factor: 1.205

Front. Earth Sci.    2014, Vol. 8 Issue (3) : 351-361    https://doi.org/10.1007/s11707-014-0414-2
RESEARCH ARTICLE
The assemblage characteristics of benthic macroinvertebrates in the Yalutsangpo River, the highest major river in the world
Mengzhen XU1,*(),Zhaoyin WANG1,*(),Baozhu PAN2,Guoan YU3
1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
2. Changjiang River Scientific Research Institute, Wuhan 430010, China
3. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
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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-?lterers 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 attitude 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.

Keywords Yalutsangpo basin      high altitude      macroinvertebrate      local diversity      regional diversity     
Corresponding Author(s): Mengzhen XU   
Issue Date: 04 July 2014
 Cite this article:   
Mengzhen XU,Zhaoyin WANG,Baozhu PAN, et al. The assemblage characteristics of benthic macroinvertebrates in the Yalutsangpo River, the highest major river in the world[J]. Front. Earth Sci., 2014, 8(3): 351-361.
 URL:  
https://academic.hep.com.cn/fesci/EN/10.1007/s11707-014-0414-2
https://academic.hep.com.cn/fesci/EN/Y2014/V8/I3/351
Fig.1  Study area and sampling sites in the Yalutsangpo basin.
SiteH/mh/mv/(m·s-1)DO/(mg·L-1)T/°CSeasonStream conditionRiparian conditionSBD/ (ind. ·m-2)W/( g·m-2)
S14,4840-0.20.3-0.58.41.3WinterStep-pool developed, channel width= 3 mAlpine meadow, VC= 100%, VH= 1-5cm2113.46202.47
S24,2280.1-0.40.838.13.5WinterStable bed, channel width=10 mAlpine meadow, VC= 100%, VH= 1-5cm2114.56726.12
S34,0140-0.250.3-0.57.94.7WinterBraided stream, macro-algae covered bed, channel width=100 mChannelized bank, VC<5%1710.13750.27
S43,9160-0.150.1-0.36.210.5WinterWetland linked with channel, rich humus, channel width=50 mAlpine meadow, VC= 100%, VH= 5-20cm1710.51861.17
S53,9010.2-0.40.17.93SummerBarrier lake, sand bed, channel width=5 mNo vegetation83.11920.26
S63,7680-0.30.39.617.4WinterBraided stream, gravel bed, channel width=50 mNo vegetation2914.13462.72
S73,7520.1-0.30.3-0.58.52SummerGlacier-fed stream, gravel bed, channel width=10 mShrub, VC= 10%3615.73261.25
S83,5980-0.50.3-0.81010.5WinterBraided river, wide valley, gravel bed, channel width=50 mHerbage and trees, VC=100%2517.483021.35
S93,5660-0.50.37.712.4WinterBraided river, wide valley, gravel-clay bed, channel width=40 mNo vegetation1712.22,4407.59
S103,5140-0.40.3-0.58.17.2WinterStep-pool developed, channel width=5 mChannelized bank, VC<2%3320.41,5133.33
S113,2370.5-1.50.5-1.58.08.0SummerStep-pool developed, channel width=20 mNo vegetation1813.12790.51
S122,9930.1-0.506.713SummerRiver bend, lentic, channel width=100 mNo vegetation149.56802.12
S132,9590.2-0.41.5-27.88.0SummerGravel bed, lotic, channel width=200 mAlpine meadow, VC= 50%, VH= 5-200cm167.2460.24
S142,9480.3-1.00.1-0.3 1.5-2.07.515SummerWetland, gravel bed, channel width=30 mAlpine meadow, VC= 80%, VH= 1-10cm2010.42,4152.64
Tab.1  Environmental parameters and macroinvertebrate biodiversity indices of the sampling sites
Fig.2  Density compositions of different groups of macroinvertebrates at all sites.
Fig.3  Density compositions of different functional feeding groups of macroinvertebrates.
Fig.4  Comparison of biodiversity indices of macroinvertebrate assemblages in the Yalutsangpo and Juma basins.
Fig.5  Taxa richness S as a function of altitude H; (b) Index B as a function of altitude H.
Fig.6  (a) Density D as a function of altitude H; (b) Biomass W as a function of altitude H.
Fig.7  Relation between cumulative taxa richness Sn and altitude H.
Fig.8  Relations between cumulative loss of families, cumulative gain of families, and altitude.
Fig.9  Regional richness compositions of different families at different altitude ranges.
Fig.10  DCA plots of the sampling sites.
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