关键词: 底栖动物, 群落, 红树林, 福建

Abstract

Research on the biodiversity of mangrove ecosystems should include not only the plants but other components, such as the macrobenthos. In order to understand the response of the macrobenthos to a mangrove habitat with high organics and nutrients, we compared the mangrove and non-mangrove macrobenthic communities, and analyzed their spatial-temporal distributions in these two habitats from April 2006 to January 2007 in Tong’an Bay, Fujian. Six sampling stations were set in Tong’an Bay, four of them (FL1, FL2, XA-A and XA-B) were in the mangrove habitat, the other two (FL3 and XA-C) were in the non-mangrove habitat. An analysis of sediment properties showed that total organic matter (TOM) of the three sampling stations at Fenglin exceeded the critical threshold, namely 3.4%, and TOM in mangrove stations was higher than in the non-mangrove ones. A total of 91 macrobenthic taxa were obtained from the six sampling stations in Tong’an Bay, including 77 and 67 taxa from the mangrove and non-mangrove habitats, respectively. Mean macrobenthic densities in the mangrove and non-mangrove habitats were 4,445.8 inds/m²and 1,707.2 inds/m², respectively. Mean biomasses in the mangrove and non-mangrove habitats were 51.1 g/m² and 94.6 g/m², respectively. The results of an independent-samples t-test showed that mean density and mean biomass were significantly different in the two habitats. The present study revealed that the mangrove habitat has a positive influence on the Oligochaeta, such as Limnodriloides sp., that thrives in the high TOM sediments. Because of the shorter inundation period in the mangrove habitat, however, free-living molluscs and crustaceans preferred the non-mangrove habitat. Other sediment properties such as interstitial salinity and median particle diameter also affected the macrobenthic community.

Key words: macrobenthos, community, mangrove, Fujian