| 要旨トップ | 目次 | 日本生態学会第66回全国大会 (2019年3月、神戸) 講演要旨
ESJ66 Abstract


一般講演(口頭発表) D02-03  (Oral presentation)

沖縄島における外来種間の関係:グッピーからカダヤシへの繁殖干渉
Relationship between invasive species:Reproductive interference from Guppy to Mosquitofish

*Ohzora DEKI(Ryukyu Univ.), Kaori Tsurui(Ryukyu Univ., CSRP), Shingo Fujimoto(CSRP), Haruki Tatsuta(Ryukyu Univ.), Kazuki Tsuji(Ryukyu Univ.)

Guppy Poecilia reticulata (Cyprinodontiformes: Poeciliidae) and the mosquitofish Gambusia affinis (Cyprinodontiformes: Poeciliidae) are small ovoviviparous fish which have established their introduced populations on Okinawa Island. They are likely in a competitive relationship, because their distributions are mutually exclusive on Okinawa. The underlying mechanism is, however, unknown.  Our field surveys suggested that the mosquitofish initially became established on Okinawa Island, before being replaced by the more recently introduced guppies. Moreover, our laboratory experiments suggested that reproductive interference was a mechanism underlying this species exclusion. The presence of guppy males led to a decrease in fecundity of the mosquitofish females, whereas fecundity of guppies was not affected by the presence of the mosquitofish males. We discuss the possibility to utilize this reproductive interference to eradicate the pest mosquitofish.


日本生態学会