ある下水処理場で観察されたユスリカの群飛行動

概要

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Observations on the swarming behavior of chironomid migdes were conducted from August 1997 to May 1998 at the Kurobe Municipal Sewage Treatment Plant. Massive swarmings of Chironomus yoshimatsui and Brilla longifurca were observed usually at the discharging gate of treated water and at the side of aeration tank building. On the other hand, a large number of swarmings of Paratrichocladius rufiventris were found at a Aqua Park, where a pond and a stream with treated clean water exist, throughout the year. At the surrounding rivers Rheotanytarsus kyotoensis formed huge swarms above the water suface. Formation of swarmings of each species showed its own chracter. The swarm was often occupied dominantly by single species, accompanying with a few individuals of some other species. The swarms were found to be consisted of males entirely. The swarms of C. yoshimatsui and B. longifurca were observed to be taken place actively around sunset and sunrise near the breeding places.
日本ペストロジー学会の論文
2000-10-23