Community structure and spatiotemporal patterns of macrozoobenthos in Lake Chaohu (China)

Cai, Yongjiu; Gong, Zhijun; Xie, Ping

doi:10.3354/ab00455

Cited by 19 publications

(7 citation statements)

References 36 publications

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“…S7, S8). The effects of eutrophication on macroinvertebrate diversity of the two lakes has been well documented in previous studies (Cai et al 2012a(Cai et al , 2012b. Additionally, the amount of variation in bioassessment metrics explained by human-induced factors in Lake Taihu (31.4% on average) was higher than that in the case of of Lake Choahu (15.5%), which probably due to the relative strong environmental gradients in Lake Taihu.…”

Section: Roles Of Human-induced Factors Natural Conditions and Spatial Processes On Bioassessment Metricssupporting

confidence: 62%

Metacommunity ecology meets bioassessment: Assessing spatio-temporal variation in multiple facets of macroinvertebrate diversity in human-influenced large lakes

Cai

Zhang

et al. 2019

Ecological Indicators

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Metacommunity theory emphasizes that local communities are jointly affected by environmental filtering and spatial processes. However, the roles of spatial processes are often given insufficient attention in bioassessment practices, which may bias the assessments of ecological status based on biotic metrics. Here, we quantified the relative importance and the seasonal stability of spatial processes, natural conditions and human-induced factors in structuring variation in different bioassessment metrics based on macroinvertebrate communities. Our study systems were two extensively sampled large and shallow lakes with strong nutrient gradients related to human disturbance. The roles of different drivers were examined for three kinds of indicators: general diversity, trait-based and taxonomic distinctness metrics, and their performance in characterizing human disturbance was evaluated.Overall, human-induced and spatial factors were all important in explaining variation in the three types of bioassessment metrics. Contrary to our expectations, however, we found that the importance of spatial processes on bioassessment metrics can be comparable to the effects of local environmental conditions at the within-lake scale. Furthermore, the results showed substantial seasonal variability in the relative roles of different drivers, which might be linked to life-cycle seasonality of macroinvertebrates. As expected, trait-based metrics generally were best associated with human-induced variables in both lakes, whereas general diversity and taxonomic distinctness metrics performed poorly. The low effectiveness of taxonomic distinctness metrics might due to low species richness associated with high nutrient levels. To conclude, our results suggest that bioassessment cannot exclusively rely on the idea of environmental filtering even if we focus on fine spatial scales. We hence strongly urge that spatial processes, natural drivers and temporal variability should be better considered in combination in the development and application of bioassessment approaches. In addition, taxonomic distinctness measures should be used with caution, especially for the ecosystems and organism groups typically characterized by low species richness.

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Section: Roles Of Human-induced Factors Natural Conditions and Spatial Processes On Bioassessment Metricssupporting

confidence: 62%

Metacommunity ecology meets bioassessment: Assessing spatio-temporal variation in multiple facets of macroinvertebrate diversity in human-influenced large lakes

Cai

Zhang

et al. 2019

Ecological Indicators

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“…Downstream of the Yangtze River, China, most records from Lake Taihu 12 , 24 , 27 , Lake Hongze 14 , and Lake Chaohu 13 .…”

Section: Taxonomymentioning

confidence: 99%

“…11 found this species in the Mekong Delta in Vietnam. Finally, Novaculina chinensis was described from the Taihu Lake, a large floodplain water body in the lower Yangtze River basin 12 , and later reported from two additional lakes and a river in the same region 13 – 15 .…”

Section: Introductionmentioning

confidence: 99%

Discovery of Novaculina myanmarensis sp. nov. (Bivalvia: Pharidae: Pharellinae) closes the freshwater razor clams range disjunction in Southeast Asia

Bolotov

Vikhrev

Lopes‐Lima

et al. 2018

Sci Rep

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The razor clam genus Novaculina represents an example of a marine-derived, secondary freshwater group. It was thought to comprise three species: N. gangetica (Ganges and smaller basins in Bangladesh and northwestern Myanmar), N. siamensis (Bang Pakong and Pasak rivers in Thailand and Mekong River in Vietnam), and N. chinensis (lower Yangtze River, China). Here we describe Novaculina myanmarensis sp. nov., an additional species from the Ayeyarwady and Salween basins representing a divergent lineage that appears to be sister to N. gangetica. This new record closes a Novaculina range disjunction between northwestern Myanmar and Thailand. The populations of this novel species share a shallow molecular divergence from each other indicating potential dispersal events between the two distant freshwater basins during the Late Pleistocene. Our ancestral area modeling suggests that the MRCA of Novaculina crown group was a salt-tolerant freshwater species. The recent Novaculina species most likely originated via allopatric speciation. Our findings highlight that generalist estuarine species could have played the role as a source for bivalve expansions into freshwater and that western Indochina is a separate biogeographic subregion, which is clearly distinct from India. A new synonymy is proposed as follows: Pharellinae Stoliczka, 1870 = Novaculininae Ghosh, 1920 syn. nov.

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“…The eastern lake region connects to the Yuxi river, an only outflowing river, which is the only channel connecting the eastern region to the Yangtze River. However, in the past decades, there has been increasing industrial and agricultural pollution and other strong human activities, causing serious deterioration in water quality of the lake, and increasing coverage and duration of cyanobacterial blooms [ 19 ]. Extensive research has been directed to the causes and mechanisms of eutrophication in Chaohu Lake [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

The bacterial community composition and its environmental drivers in the rivers around eutrophic Chaohu Lake, China

Shao

Yao

et al. 2021

BMC Microbiol

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Background Bacterial community play a key role in environmental and ecological processes in river ecosystems. Rivers are used as receiving body for treated and untreated urban wastewaters that brings high loads of sewage and excrement bacteria. However, little is known about the bacterial community structure and functional files in the rivers around the eutrophic Chaohu Lake, the fifth largest freshwater lake in China, has been subjected to severe eutrophication and cyanobacterial blooms over the past few decades. Therefore, understanding the taxonomic and functional compositions of bacterial communities in the river will contribute to understanding aquatic microbial ecology. The main aims were to (1) examine the structure of bacterial communities and functional profiles in this system; (2) find the environmental factors of bacterial community variations. Results We studied 88 sites at rivers in the Chaohu Lake basin, and determined bacterial communities using Illumina Miseq sequencing of the 16 S rRNA gene, and predicted functional profiles using PICRUSt2. A total of 3,390,497 bacterial 16 S rRNA gene sequences were obtained, representing 17 phyla, and 424 genera; The dominant phyla present in all samples were Bacteroidetes (1.4-82.50 %), followed by Proteobacteria (12.6–97.30 %), Actinobacteria (0.1–17.20 %). Flavobacterium was the most numerous genera, and accounted for 0.12–80.34 % of assigned 16 S reads, followed by Acinetobacter (0.33–49.28 %). Other dominant bacterial genera including Massilia (0.06–25.40 %), Psychrobacter (0-36.23 %), Chryseobacterium (0.01–22.86 %), Brevundimonas (0.01–12.82 %), Pseudomonas (0-59.73 %), Duganella (0.08–23.37 %), Unidentified Micrococcaceae (0-8.49 %). The functional profiles of the bacterial populations indicated an relation with many human diseases, including infectious diseases. Overall results, using the β diversity measures, coupled with heatmap and RDA showed that there were spatial variations in the bacterial community composition at river sites, and Chemical oxygen demand (CODMn) and (NH4+ )were the dominant environmental drivers affecting the bacterial community variance. Conclusions The high proportion of the opportunistic pathogens (Acinetobacter, Massilia, Brevundimonas) indicated that the discharge of sewage without adequate treatment into the rivers around Chaohu Lake. We propose that these bacteria could be more effective bioindicators for long-term sewage monitoring in eutrophic lakes.

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Community structure and spatiotemporal patterns of macrozoobenthos in Lake Chaohu (China)

Cited by 19 publications

References 36 publications

Metacommunity ecology meets bioassessment: Assessing spatio-temporal variation in multiple facets of macroinvertebrate diversity in human-influenced large lakes

Metacommunity ecology meets bioassessment: Assessing spatio-temporal variation in multiple facets of macroinvertebrate diversity in human-influenced large lakes

Discovery of Novaculina myanmarensis sp. nov. (Bivalvia: Pharidae: Pharellinae) closes the freshwater razor clams range disjunction in Southeast Asia

The bacterial community composition and its environmental drivers in the rivers around eutrophic Chaohu Lake, China

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