| Mangrove wetland ecosystem is located in tropical and subtropical areas as well as low-energy intertidal zone. It combined the feature of terrestrial and marine ecosystem with its extremely strong ecological functions and its unique social and economical value. The flora and fauna which existed inside plays an very important role in the whole system. The paper provide theoretical basis for protecting mangrove wetland ecosystem by the mean of doing the research and study the diversity of insect community in Nansha wetland in Guangzhou city. The main results are as follows:1. The insect community composition in Nansha wetland in Guangzhou city: with the investigation in2012, the total insects captured were2272heads, belonging to12orders36families and67species.14families and30species of lepidoptera was the largest species, the ratio of the total captured was44.7%followed by2families,10species of odonata which was14.93%. There are four key types of habitat type in Nansha wetland in Guangzhou city. They are mangrove region, dwarf forest region, reed zone and lotus zone. Moreover,8orders16families and22species insects were found in mangrove region, lepidoptera insects accounts for50.00%of the total captured;9orders23families and34species were found in dwarf forest region, Lepidoptera insects still accounts for the largest proportion of52.94%;10orders18families and26species were found in reed zone, the odonata accounts for the largest proportion of23.08%followed by Lepidoptera and coleoptera which average proportion were15.38%; the insects in lotus zone were much less, only3orders4families6species were found, the odonata accounts for the major proportion of66.67%.2. The analysis results about diversity of insect community in Nansha wetland in Guangzhou city:the comparison of four different habitat types based on the whole year round, the Margalef richness index dwarf forest region> reed zone> mangrove region> lotus zone; Shannon-Wiener diversity index dwarf forest region> reed zone> mangrove region> lotus zone; Pielou community evenness index reed zone> lotus zone> dwarf forest region> mangrove region; and Simpson dominance index reed zone> dwarf forest region> mangrove region> lotus zone; the differences in last two index were not obvious. The change in the same habitat type in different months of a whole year, The numerical rang of the Margalef richness index in mangrove region was (1.22123.0979), dwarf forest region was (1.8416,4.9625), reed zone was (0.7797,2.5187), lotus zone was (0.0000,1.3377); The numerical rang of Shannon-Wiener diversity index in mangrove region was (1.9594,3.4108), dwarf forest was (2.6708,4.0807), reed zone was (1.1148,3.2307), lotus zone was (0.0000,2.4230); The numerical rang of Pielou community evenness index in mangrove region was (0.6593,0.9694), dwarf forest was (0.8607,0.9969), reed zone was (0.5574,0.9828), lotus zone was(0.0000,1.3219); The numerical rang of Simpson dominance index in mangrove region was (0.6137,0.8589),dwarf forest was(0.8230,0.9231), reed zone was (0.7619,0.9255), lotus zone was (0.0000,0.7843).The first two index reached double peak in summer and autumn in these four regions; while the other two didn’t show the obvious differences.By using the Jaccard similarity coefficient to analyze the insects community in four regions, the index number among four regions is lower than0.25, which showed that the insects community in four different habitat types are not similar to each other. Except lotus zone(the similarity coefficient was0in different months due to the quality of the captured insects was0in January, February and December of winter), the other three regions are very similar to each other in January and December, besides this, these two months showed dissimilarity or moderate dissimilarity in other months. The insects community all basically showed moderate similarity and fair similarity in three months of every season which did the same during three months in spring and autumn.3. The biological characters of three main insects in mangrove region:Hasora chromus, four generations developed yearly in Pongamia pinnata including times overlap, which exploded abundantly in early and middle May, while Mature larvae overwintered in september. Trabala vishnou in Sonneratia apetala developed four generations in a year, without overwintering.The larvae duration of male and female is different.the average of the first generation duration is52days, the average of the fourth generation duration is95days,the female has6instars, the average duration of the first is43days, the female has6instars, the average duration of the fourth is83days, the average longevity of female adult of the first generation is10days, while the male is7days, the average longevity of female adult of the fourth generation is13days,while the male is11days; Anoplophora Chinensis Forster developed one generation in one year in Sonneratia apetala, larvae got overwintered from November to December. They started up activities from late February, pupated from March, eclosion from April, reached the peak stage in May. |
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