Benthic invertebrates investigation in the East River and habitat restoration strategies

Wang, Zhaoyin; Lee, Joseph Hun Wei; Cheng, Dongsheng; Duan, Xuehua

doi:10.1016/j.jher.2008.05.005

Cited by 19 publications

(11 citation statements)

References 16 publications

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“…Completely dissimilar from the upstream links, the downstream links connecting H. molitrix , P. pekinensis and M. guttatu with plankton, bivalves, and annelids indicate semi‐lentic eutrophic waters with greater depth and a silt substrate. The impacts of the upstream Fengshuba Dam, which obstructs the hydrodynamic connectivity of the river, stimulated the downstream loss of guild I and the emergence of guild D, which reflects the reallocation of prey sources in riffle habitats (Aarts et al, ; Wang et al, ).…”

Section: Discussionmentioning

confidence: 99%

Longitudinal variation in fish prey utilization, trophic guilds, and indicator species along a large subtropical river, China

Wang

Tang

et al. 2018

Ecology and Evolution

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Due to the heterogeneous distribution of resources along large rivers, understanding prey utilization by basin‐scale fish assemblages remains a challenge, and thus, recognizing regional fish trophic guilds and indicator species is important. We analyzed the stomach contents of 96 fish species along the subtropical East River in China and identified 8 prey items (29 subcategories). Site‐specific differences in fish diet composition (DC) revealed longitudinal shifts in utilized prey taxa, from upstream lotic to downstream semi‐lentic items, and these were characterized by a decrease in the proportions of epilithic diatoms and aquatic insect larvae (Ephemeroptera and Chironomidae) accompanied by an increase in bivalves (Corbicula and Limnoperna), shrimps and fishes, and organic sediments. The relative prey consumption weighted by fish abundance and biomass indicated that decreasing insect consumption and increasing detritus consumption were two fundamental vectors governing fish‐centered feeding pathways. Seventeen prey‐oriented fish guilds that were clustered based on DC matrix determined the spatial variation in the fish trophic structure. The cumulative presence of (a) upstream guilds reliant on insects and epiphytes, (b) midstream guilds reliant on hydrophytes, molluscs, and nekton, and (c) downstream guilds reliant on detritus, annelids, and plankton resulted in a longitudinal increase in guild richness, but this continuity was interrupted near the industrialized estuary. The most abundant 28 fish species across the guilds were selected as trophic indicator species; their spatial distribution significantly (p < 0.05) explained >80% of the environmental and prey variables identified. These species signified the availability of predator–prey links in distinct habitats and the key environmental factors supporting these links. With a high contribution (>51%) of exotic species, an increase in detritivores downstream distinguishes the subtropical East River from temperate rivers. Particularly, in the disturbed lower reaches, the dominance of detritivores prevailed over the predicted increase in other feeding groups (e.g., omnivores and carnivores).

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Section: Discussionmentioning

confidence: 99%

Longitudinal variation in fish prey utilization, trophic guilds, and indicator species along a large subtropical river, China

Wang

Tang

et al. 2018

Ecology and Evolution

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“…Wang et al (2008) employed benthic macro-invertebrate as indicator to evaluate the effect of ecological rehabilitation and found that biodiversity and number density of macroinvertebrate in rehabilitation reaches remained high levels compared to reference reaches of East River. The present results also showed that the species richness and biomass of phytoplankton, zooplankton, and benthos increased after the rehabilitation of vegetation.…”

Section: Discussionmentioning

confidence: 99%

“…To date, 60 % of the main river channel has been affected by the various pollutants some even are widespread in the middle and down reaches, in which areas there are high population densities (Liu and Wu 2006). Chaohu Lake, which links to Yangtze River, is the fifth largest freshwater lake in China with 756 km 2 and a mean water depth of 2.69 m in the down reach of Yangtze River Basin (Wang and Dou 1998). Unfortunately, the severe deterioration of water quality and ecological functions exert negative influences on its social and economic value.…”

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confidence: 99%

Case study on rehabilitation of a polluted urban water body in Yangtze River Basin

Cheng

Zhu

et al. 2012

Environ Sci Pollut Res

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In the past three decades, the fast development of economy and urbanization has caused increasingly severe pollutions of urban water bodies in China. Consequently, eutrophication and deterioration of aquatic ecosystem, which is especially significant for aquatic vegetation, inevitably became a pervasive problem across the Yangtze River Basin. To rehabilitate the degraded urban water bodies, vegetation replanting is an important issue to improve water quality and to rehabilitate ecosystem. As a case study, a representative polluted urban river, Nanfeihe River, in Hefei City, Anhui Province, was chosen to be a rehabilitation target. In October 2009 and May 2010, 13 species of indigenous and prevalent macrophytes, including seven species emergent, one species floating leaved, and five species submersed macrophytes, were planted along the bank slopes and in the river. Through 1.5 years' replanting practice, the water quality and biodiversity of the river had been improved. The concentrations of total nitrogen (TN), total phosphorus (TP), and ammonia nitrogen (NH 4 + -N) declined by 46.0, 39.5, and 60.4 %, respectively. The species of macrophytes increased from 14 to 60, and the biodiversity of phytoplankton rose significantly in the river (p<0.05). The biomasses of zooplankton and benthos were also improved after the vegetation replanting. The study confirmed that vegetation replanting could alleviate the increasing water pollution and rehabilitate the degraded aquatic ecosystem. The case study would be an example for polluted urban waters restoration in the middle-downstream area of Yangtze River Base.

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“…Different physical conditions support different bio-communities and diversified physical conditions may support diversified bio-communities. Wang et al (2008Wang et al ( , 2009) proposed a habitat diversity index H D to capture this Vol. 48, No.…”

Section: Methodsmentioning

confidence: 99%

Restoration of an incised mountain stream using artificial step-pool system

Wang

Kang

et al. 2010

Journal of Hydraulic Research

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Benthic invertebrates investigation in the East River and habitat restoration strategies

Cited by 19 publications

References 16 publications

Longitudinal variation in fish prey utilization, trophic guilds, and indicator species along a large subtropical river, China

Longitudinal variation in fish prey utilization, trophic guilds, and indicator species along a large subtropical river, China

Case study on rehabilitation of a polluted urban water body in Yangtze River Basin

Restoration of an incised mountain stream using artificial step-pool system

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