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Lake biodiversity is an incomplete indicator of exogenous forcing insofar as it ignores underlying deformations of community structure. Here, we seek a proxy for deformation in a network of diatom assemblages comprising 452 species in 273 lakes across China. We test predictions from network theory that nodes of similar type will tend to self‐organize in an unstressed system to a positively skewed frequency distribution of nodal degree. The empirical data reveal shifts in the frequency distributions of species associations across regions, from positive skew in lakes in west China with a history of low human impacts, to predominantly negative skew amongst lakes in highly disturbed regions in east China. Skew values relate strongly to nutrient loading from agricultural activity and urbanization, as measured by total phosphorus in lake water. Reconstructions through time show that positive skew reduces with temporal intensification of human impacts in the lake and surrounding catchments, and rises as lakes recover from disturbance. Our study illustrates how network parameters can track the loss of aquatic assemblage structure in lakes associated with human pressures. [ABSTRACT FROM AUTHOR]

[Display omitted] • Heterogeneity index(H) is a structural parameter describing the distribution of species associations. • H is proposed to unveil the species turnover in community in this paper. • Eight lakes exhibit a eutrophication trend with different degrees from the 1950s. • H , species richness, evenness and Jaccard index respond differently to eutrophication. • H can serve as a complementary biodiversity metric to quantify functional diversity. Anthropogenic eutrophication in aquatic ecosystems has had significant negative effects on biodiversity and human wellbeing. Improving our understanding of the ways in which biological communities respond to eutrophication underlies biodiversity conservation, and diversity metrics like species richness and evenness are often used to assess environmental impacts on biodiversity. However, such studies mainly consider overall gain and loss, ignoring species replacement in community succession. This paper combines paleolimnology and network science to propose a heterogeneity index (H) to measure community successions by linking long-term changes in community structure with environmental stress. Eight lakes of different types in the middle and lower reaches of the Yangtze River Basin (MLYB) were selected, and we focused on diatom communities to reconstruct their ecological trajectories after significant anthropogenic impact. The combined results suggested that human impacts have caused eutrophication in each lake since the 1950s, but led to different degrees of impact on the diatom communities. In hypereutrophic lakes, diatom assemblages shifted to high-nutrient tolerance and the proportions of epiphytic-benthic species decreased, while in mildly eutrophic lakes, a switch to mild-nutrient tolerant assemblages occurred in planktonic and epiphytic-benthic species with no change in epiphytic-benthic proportions. The H of diatom communities declined in hypereutrophic lakes, but changed little in mildly eutrophic lakes after the 1950s. Meanwhile, no regular changes in diversity indicators such as richness, evenness and the Jaccard-index occurred with lake eutrophication. The ordered species turnover in nutrient-enriched diatom communities may account for the discrepancies in H and the above indices, such as ordered epiphytic-benthic species being replaced by higher nutrient-tolerant and planktonic species with no necessarily attendant reduction in species richness. By quantifying the alteration of species associations without being influenced by species diversity, the H index effectively reveals the succession of diatom communities, and can therefore serve as a complementary indicator of biodiversity. [ABSTRACT FROM AUTHOR]

Conventional measures of mainstreaming wetlands biodiversity conservation such as counting relevant regulations and policies produce little insight into the success or failure of mainstreaming or of the potential for impact on wetlands biodiversity of sectoral laws and policies. The authors developed a semi-quantitative process to evaluate the regulatory framework at national and provincial levels that can effectively promote discussions with sectoral ministries on change of legal/regulatory texts that would improve the management of wetlands. The paper outlines the methodology, how the results are interpreted, and some of the key concerns in implementing the methodology. [ABSTRACT FROM AUTHOR]

The changes of structural and functional parameters of aquatic microbial communities in continuous water on campus of Tsinghua University, China are investigated by polyurethane foam unit( PFU) method. The measured compositions of the communities include alga, protozoa, and some metazoa ( such as rotifers). The measured indicators of water quality include water temperature, pH values dissolved oxygen ( DO). potassium permangan ale index CODMD) total nitrogen (TN), total phosphorus (TP) and chlorophyll-a ( Chla). The trophic levels expressed by the trophic level indices (TL/c) is assessed with analytic hierarchy process and principal component analysis (AHP-PCA) method. The changing trends of the structural and functional parameters of aquatic microbial communities. such as Margalef index of diversity (D) Shannon-weaver index of diversity (H). Heterotropy index (HI), number of species when the colonization gets equilibrium ( Seq), colonizing speed constant (G) and time spent when 90 percent of Seq colonized in PFU (T(a)) are also analyzed. The experimental results showed the succession of aquatic microbial communities along the water flow is consistent with the water quality, so the parameters of microbial community can reflect the changes of water quality from the ecological view. [ABSTRACT FROM AUTHOR]