The Temporal Dynamics And Structure Of Insect Community In Caizi Lake Wetland(Southern Anhui, China)

Insects are important components of the wetland ecosystem, which have important significance to maintain the balance of the wetland ecosystem stable. The temporal dynamic and structure of insect community, the diversity of the insects and the fauna of Coleoptera of the dominant families under the lamp in Caizi lake wetland from Anqing of Anhui province are studied by using the conventional collection methods from2012to2013. Firstly we clarify the characteristics of the spatial-temporal of the community structure and then discuss how the community structure and distribution of insect community response to human disturbance aiming to provide theoretical basis and basic information for the maintainance of wetland ecosystem and biodiversity conservation, the main results are as follows:(1) A total of7251insect specimens were trapped belonging to235species,207genera,89families and8orders from the farmland, intertidal-grass zone and grass-shrub zone of the Caizi lake wetland by sample investigating sweeping, net traping, turning stone and knock out, and the dominant taxa were Diptera, Hemiptera, Orthoptera; there were2519specimens belonging to58families and112species in the farmland,2960specimens belonging to69families and69species in the intertidal-grass and1772specimens belonging to60families and126species in the grass-shrub zone.(2) The diversity index of insect community showed highly correlation with eveness but weakly with richness in three habitat types, which was in the order of grass-shrub zone, farmland and intertidal-grass zone from high to low level. The mean value (0.25±0.02) of similarity index of insect taxa among three habitats showed that the vegetation type and human disturbance had significant influence on the instect community, which was showed by that the farmland was moderately dissimilar to intertidal-grass zone but not less similar to grass-shrub zone, also the intertidal-grass was not highly similar with grass-shrub zone.(3) The comparison of diversity of insect community in three habitats showed that there were no significant differences among the richness index S of them, which was in the order of farmland, intertidal-grass zone and grass-shrub zone from high to low level; then diversity index H’ and ACE estimate value of intertidal-grass zone and grass-shrub zone in three habitats had significant differences with farmland, whereas there was no significant difference between the intertidal-grass zone and grass-shrub zone (P<0.05); the community stability of intertidal-grass zone and grass-shrub zone were higher than the farmland, which showed that human disturbance had significant influences on the insect community in Caizihu wetland.(4) A total of4039specimens belonging to8orders,78families,213genera and279species were collected by light trap. The dominant taxa were Coleoptera, Hemiptera, Lepidoptera, which accounted for66.02%,13.38%,7.52%respectively of the total collecting individuals. Carabidae, Cerambycidae and Coccinellidae were the dominant families, accounting for25.51%,15.31%and7.14%respectively; and the Chlaenius, Harpalus, Bembidion, Syneta, Agriotes, Aphodius, Berosus were the dominant genus; the dominant species were Holotrichia parallela in Scarabaeidae, Argopistes udege in Scarabaeidae, Hydrophilus acuminants in Hydrophilidae, Cicadella viridis in Cicadellidae, Harmonia axyridis in Coccinellidae and Bembidion mannerheimii in Carabidae. The fauna analysis of Coleoptera under the lamp in Caizihu wetland indicated that the order of the insects species were Oriental-Palaearctic realm including63species, Oriental realm including25species and Palaearctic realm including10species from the high to low level, which occupied64.29%,25.51%and10.2%respectively of the total species.