科研之友
微信
新浪微博
Facebook
分享链接
摘要
Based on macrobenthos data collected in October 2000, March 2001, June 2003, January 2004, and April and August 2011 in the Yellow Sea, the feeding functional groups were analyzed (the measurement of water and sediment environmental data in April and August 2011 only). Macrobenthic organisms were assigned to six distinct trophic groups (herbivores, deposit-feeders, filter-feeders, carnivores, detritus-feeders, omnivores) and the feeding diversity and ecosystem health of the research area were estimated using the Pielou's evenness index. The dominance of feeding groups was related to environmental variables using multivariate ordination techniques (Redundancy Analysis). Results show that deposit-feeders and carnivores were most abundant functional groups. Relatively high abundance of deposit-feeders and carnivores in the Yellow Sea appeared in the August 2011, 44.88% and 39.04% respectively. The spatial distribution of trophic groups of macrobenthos in the Yellow Sea was based on the cold water mass of the Yellow Sea. The carnivores of macrobenthos in the Yellow Sea were mainly distributed on the edge of the cold water mass of the Yellow Sea near the east of Haizhou Bay. Deposit-feeders were mainly distributed near the shores of the Yellow Sea and on the edge of the cold water mass of the Yellow Sea. Filter feeders were mainly distributed in the central region of the cold water mass of the Yellow Sea. Assuming that a healthy environment is characterized by all feeding groups, with a clear dominance of deposit-feeders and carnivores, the feeding diversity index would be expected to be maximal when the evenness feeding diversity index is nearly one. Most of the stations in the research area exhibited good or high feeding diversity, corresponding to a healthy ecological state, while the excepting of stations in the coastal waters showed low feeding diversity values. A multivariate analysis (RDA; using the trophic composition) showed the macrobenthos functional groups response to environmental variables in the Yellow Sea in April and August 2011. Result of indicated that the bottom water salinity, temperature, and the median particle size of sediment were significant impactors of community trophic structure variance (P<0.05).
- 单位
