The water system of traditional rice paddies as an important habitat of the giant water bug, Lethocerus deyrollei (Heteroptera: Belostomatidae)
The water system of traditional rice paddies as an important habitat of the giant water bug, Lethocerus deyrollei (Heteroptera: Belostomatidae)
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DOI：
10.1007/s10841-005-3488-z
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发表时间：
2005-06-01
影响因子：
1.9
通讯作者：
Ishii, Minoru
中科院分区：
文献类型：
--
作者：
Mukai, Yasuo;Baba, Naoto;Ishii, Minoru
1999年6月至2001年12月，在日本大阪市北部由森林、农田和聚落组成的传统景观中，研究了中山五种水域、永久和临时水池、沟渠、稻田和沼泽的种群动态，包括生境利用的季节变化。对成虫进行了标记和捕获普查，并在若虫中记录了阶段和数量。研究期间，5种水系共捕获成虫95只，捕获成虫48只（51%）。新一代成虫从7月下旬开始出现，在入冬前消失。4月上旬至6月上旬在永久和临时池塘、沟渠和水田中共捕获3只越冬成虫。夏季水温较高的永久、临时水塘和沟渠中，水蚤成虫及其猎物蝌蚪、蛙的密度均较高。夏季在不同密度的所有水型中均可发现3 ~ 5龄若虫，而1 ~ 2龄若虫仅在水温较高且存在水稻植株、其他吸湿体和木桩等产卵基质的永久性水池、沟渠和稻田生境中发现。这些结果表明，在整个中山景观中，传统的水田水系为L. deyrollei提供了一个重要的栖息地，但随着农业生产方式的改变，L. deyrollei和其他栖息在该系统中的原生生物群一样受到威胁。
The population dynamics of Lethocerus deyrollei, including the seasonal change in the habitat utilization, were studied in five types of waters, permanent and temporary pools, ditch, rice paddy and marsh in a Satoyama, the traditional landscape in Japan consisting of mixtures of coppice woodlands, farmlands, and settlements, in northern Osaka, from June, 1999 to December, 2001. A mark and recapture census was carried out with adults, and the stage and the number were recorded in nymphs. A total of 95 adults were numbered, and 48 (51%) were recaptured in all the five water types during the study period. Adults of the new generation appeared from late July, and disappeared before the winter in all types of waters. A total of three overwintered adults were recaptured in permanent and temporary pools, ditch, and paddy from between early April and early June. Densities of both L. deyrollei adults and their prey, tadpoles and frogs, were high in permanent and temporary pools, and ditch, in which water temperatures were high in the summer season. Third to fifth (final) instar nymphs were also observed in all water types with different densities in summer, while first and second instars were found only in permanent pool, ditch and paddy habitats in which water temperatures were high and oviposition substrata such as the rice plant, other hygropbytes and wooden stakes existed. These results show that the traditional water system of paddy in the Satoyama landscape as a whole provides an important habitat for L. deyrollei which is now under threat by changing agricultural practices like other native biota inhabiting the system.