TY - JOUR
T1 - The water system of traditional rice paddies as an important habitat of the giant water bug, Lethocerus deyrollei (Heteroptera
T2 - Belostomatidae)
AU - Mukai, Yasuo
AU - Baba, Naoto
AU - Ishii, Minoru
N1 - Funding Information:
We express our sincere thanks to members of Nature Conservation Society of Osaka for helpful cooperation. We also thank to Dr T. Hirowatari and Mr N. Hirai, Entomological Laboratory of Osaka Prefecture University, for invaluable comments and advice. Our thanks are also due to colleagues of our laboratory for helpful cooperation and comments. This research was supported by Grant-in-Aids from the Nippon Foundation (1999 and 2000), and those from the Japan Ministry of Education, Culture, Sports, Science and Technology (no. 15510193).
PY - 2005/6
Y1 - 2005/6
N2 - 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 hygrophytes 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.
AB - 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 hygrophytes 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.
KW - Giant water bug
KW - Japan
KW - Lethocerus deyrollei
KW - Mark and recapture census
KW - Paddy
KW - Satoyama
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U2 - 10.1007/s10841-005-3488-z
DO - 10.1007/s10841-005-3488-z
M3 - Article
AN - SCOPUS:18644380156
VL - 9
SP - 121
EP - 129
JO - Journal of Insect Conservation
JF - Journal of Insect Conservation
SN - 1366-638X
IS - 2
ER -