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Ecology and Conservation

Research Report

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Abstract
The purpose of this study is to investigate the terrestrial insect fauna of Dongsha Island and the flower-visiting behavior of insects on the island. We mainly followed the methods developed in 2008 and 2012 for the field survey with some modifications. Malaise trap is the primary method to collect insects which were supplemented by sweeping, litter collection, and free-hand collecting. Four times of investigation were taken, each on February, April, July, and November. A total of 22,048 individuals representing 471 morphospecies were collected which belong to 136 families of 14 orders. Twenty-four morphospecies were found to be new records which belong to Orthoptera, Coleoptera, Lepidoptera, Diptera, and Hymenoptera. The accumulated number of morphospecies reached 734. Some taxa occurred in the previous investigation, however, was not collected in this study. This phenomenon shows that the composition of insect fauna of Dongsha Island changed constantly. The events of colonization and extinction occurred frequently in this island. This study also used time-lapse camera to record the plant phenology and flower-visiting behavior of insects. The flowering period and leaf development stage of these plants were initially explored under such implementation. The results showed that the major flower-visiting insects were Braunsapis spp. and Pheidole megacephala which belong to Hymenoptera. The peak activity of Braunsapisbees was 7:00 to 14:00, while the ant Pheidole megacephala was crepuscular. There are three morphospecies of Braunsapis spp. according to the result of our insect fauna study. The interaction between the three Braunsapis spp. and flowering plants deserves further attention and study.


Keywords:Dongsha Island、atoll、insect fauna、malaise tra


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