The Role of Moisture in the Control of Diapause, Mating and Aggregation in a Tropical Insect
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概要
- 論文の詳細を見る
Information on the role of moisture in diapause and related behaviors in a fungus beetle, Stenotarsus rotundus (Endomychidae), is reviewed. In the tropical rainforest on Barro Colorado Island, Panama, adults of this beetle form a large aggregation on the stem of a palm tree, Oenocarpus panamanus. They stay in dormancy on the tree for as long as 10 months each year, covering about 6 months of wet season plus 4 months of dry season. Photoperiod plays an important role in diapause termination. However, this response does not explain the annual variation in the timing of diapause termination. A gradual increase in humidity during the second half of the dry season enhances their response to increasing photoperiod. This moisture response appears to constitute an adaptation to the unpredictable onset of the wet season. Mating and dispersal from the aggregation site do not take place until the first heavy rain falls at the beginning of the wet season. Beetles taken from the tree before the rain mated in an outdoor screened insectary without being exposed to high moisture. Neither drinking water nor high humidity was required. The metabolic rate decreases as group size increases. A decrease in metabolic rate can also be achieved by elevating relative humidity, thus suggesting that one function of the aggregation is to increase humidity within the group and thereby decrease metabolic rate and water loss. S. rotundus has evolved various mechanisms to cope with fluctuations and unpredictability in environmental moisture.
- 日本昆虫学会の論文
- 2000-03-25
著者
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Tanaka Seiji
Department Of Insect Physiology And Behavior National Institute Of Sericultural And Entomological Sc
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Tanaka Seiji
Department Of Engineering Science Tohoku University
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