利用大型底栖无脊椎动物进行 河流生态系统健康评价Assessing the River Health Using BenthicMacroinvertebrate Assemblages 王备新 南京农业大学 昆虫系 水生昆虫与溪流生态实验室 Beixin Wang Laboratory of aquatic insects and stream ecology Department of Entomology, Nanjing Agricultural University firstname.lastname@example.org
2. Methods2.1 Field work 64 sampling sites ( 15 reference sites) Five surber nets each site 8 environmental variables including water chemistry, habitat variables, watershed land use upstream of sampling sites
2.2 Data analysisStepwise evaluating 36 candidate metrics. Crop, forest and urban land use in upstream watershed of every site were analyzed using satellite image and a Digital Elevation Model.Statistical analysis was performed by SPSS 16.0.
3. Results B-IBI was composed of seven metrics: Total taxa, EPT taxa, Coleoptera%, Three dominant taxa, (Hydropsychidae/Trichoptera) %, Filterers% Biotic Index (BI). Fig.1 Box-plot of IBI in reference sites (R) and stressed sites (S)Table 1. Narrative interpretations and their numeric criteria (n=64) Excellent Good Fair Poor >4.64 3.15-4.64 2.34～3.15 <2.34
Relationship of B-IBI with environmental variables
Sub-basin Riparian Localentire drainage 200m buffer on each 200m buffer onupstream from side of sample point each side ofsample point extending length of sample point the drainage extending 1km network upstream Morley and Karr (2002)
Pearson’s coefficient=0.471, (p<0.001, n=101) Pearson’s coefficient=-0.352, (p<0.001, n=101) Fig. 2 the relationship among IBI and the percentage of forest land use, cropland use and urban land use at the sub-basin scale. Pearson’s coefficient=-0.421, (p<0.001, n=101)
Pearson’s coefficient=0.655, (p<0.001, n=100) Pearson’s coefficient=-0.460, (p<0.001, n=100) Fig. 3 the relationship among IBI and the percentage of forest land use, cropland use and urban land use at the local scale. Pearson’s coefficient=-0.444, (p<0.001, n=100)
Pearson’s coefficient=0.633, (p<0.001, n=100) Pearson’s coefficient=-0.470, (p<0.001, n=100) Fig. 4 the relationship among IBI and the percentage of forest land use, cropland use and urban land use at the riparian scale. Pearson’s coefficient=-0.397, (p<0.001, n=100)
Summary1. Benthic macroinvertebrates have been used in river health assessment in China.2. Benthic Index of biological integrity (B-IBI) was a sensitive indicator of stream health and had close relationship with watershed land use change and water nutrient enrichment in Xitiaoxi watershed.3. Predictive model might be a good alternative in river health assessment in future.4. More research on benthos-based assessment is required to further enhance its important role in the management of aquatic ecosystem.
Acknowledgements All of my colleagues and students in our laboratory contributed to this study, including Prof. Lianfang Yang, Dr. Changhai Su, Mr. Jie Zhang, Dr. Yong Zhang. Many thanks to all my collaborators, including Dr. Yong Cao, Dr. Wei Liu, Dr. Desuo Cai, Dr. Lizhu Wang, Dr. John C Morse, Dr. Richard Johnson, Dr. Robert M. Hughes, Dr. Yangdong Pan, Dr. Susan K Jackson. The studies were supported by NSFC and grants from MWR .