Community Structure and Secondary Production of Benthic Macroinvertebrates in a Second Order River of Changjiang River Basin
|School||Huazhong University of Science and Technology|
|Keywords||Sigh Gouhe Of macrobenthos Community structure Biodiversity Functional feeding groups Standing crop Production P / B ratio|
Yangtze tributary of Qingjiang a two tributaries - sigh Gouhe macrobenthic animal community structure and production from April 2006 to March 2007, a one-year investigation and research, including: Macrobenthic Communities structure, biodiversity and water quality assessment, based on biological indices the macrobenthos in existing dynamic and production estimates. The main findings are as follows: 1) sigh Gouhe were collected into 80 kinds of macrobenthos, including three kinds of annelids, molluscs species, 69 kinds of insects, soft-four kinds of animals. Functional feeding groups include: shredder species, 53 kinds of collectors, scrapers 10 species, 12 kinds of predators. 2) determination of the microhabitats of macrobenthos community diversity. 5 sampling points (S5), 6 sampling points (S6) Simpson diversity index fluctuations is relatively stable (range 2.23 to 7.33,2.01 to 6.99), sampling points (S1) and second sampling point (S2) Simpson biodiversity indices shock severe (range 3.56 to 10.62,3.56 to 10.35). Each sampling point Margalef diversity index and the Shannon-Wiener diversity index fluctuations than flat. 3) Comparison of different microbial community structure of the mirror. The overall total of species living in various microhabitats advantage, the minimum similarity also reached 0.6105. Sampling point 1 (S1) / sampling point 3 (S3), (S3) of sampling points 3 / sampling point 4 (S4), the sample point 3 (S3) / sampling points 6 (S6) the similarity of more up 0.8403,0.8148 0.8108. 4) according to the number of species collected and species diversity index, with reference to the biological index for assessing water environment, evaluation sigh Gouhe water quality are minor pollution. 5) determination of the the existing the quantity anniversary dynamic and community standing crop anniversary dynamic dominant species. (1) The main advantage of macrobenthos the existing amount: a fine the mayfly average density and biomass were 80.75 ind / m ~ 2,0.052 g / the m ~~ 2; a small chang wasp 169.58 ind / m ~ 2,0.090 g / m ~ 2; two wing wasp to 524.08 ind / m ~ 2,0.229 g / m ~~ of; flat mayfly to 225.75 ind / m ~~ 2,0.688 g / m ~~; Krenopsection sp. was 52.30 ind / m ~ 2,0.011 g / m ~ 2; Trissopelopia sp. 171.92 ind / m ~ 2,0.071 g / m ~~ and 2; Cylindraceus sp. 66.08 ind / m ~ 2,0.011 g / m ~ 2; Auctions caddis 190.42 ind / m ~ 2,2.953 g / m ~ 2; bow caddis 50.50 ind / m ~ 2,0.058 g / m ~ 2; (2) the average density and biomass of the community were 2280.25 ind / m ~ 2,52.167 g / m ~ 2. 6) estimates sigh Gouhe main groups of macrobenthos annual production (g / m ~ 2) and P / B. (1) the the mayfly taxa anniversary production volume and P / B: fine mayfly, 0.60 to 10.78 (average 4.22), 5.4 to 8.1 (mean 6.4); small Sang wasp, 4.18 to 17.48 (average of 8.08), 5.8 ~ 8.1 (mean 7.1); two Wings wasp, 6.78 to 99.69 (average 44.01), 13.0 to 19.5 (average 17.0); flat mayfly, 37.94 to 194.56 (average 93.35), 9.2 to 14.9 (average 11.5). (2) The the chironomid taxa annual production (wet weight, gm-2) and P / B: Krenopsection sp, 3.30,6.4; Trissopelopia sp, 17.44,3.4; Cylindraceus sp, 1.66,2.3. The (3) Trichoptera taxa annual production (wet weight, gm-2) and P / B: proluta moth, 1541.70, 20.7; bow caddis 65.74,15.8.