Vol. 51 No. 7, 2012
How Does the Ambush Predatory Copepod Megacyclops formosanus (Harada, 1931) Capture Mosquito Larvae of Aedes aegypti?
Amit Kant Awasthi1, Cheng-Han Wu1, Kun-Hsien Tsai2, Chwan-Chuen King2, and Jiang-Shiou Hwang1,*
1Institute of Marine Biology, National Taiwan Ocean University, Keelung 202, Taiwan
2Institute of Epidemiology, National Taiwan University, Taipei 106, Taiwan
Amit Kant Awasthi, Cheng-Han Wu, Kun-Hsien Tsai, Chwan-Chuen King, and Jiang-Shiou Hwang (2012) The purpose of this study was to understand the mechanisms through which an ambush predatory copepod, Megacyclops formosanus (Harada, 1931), captures mosquito larvae of Aedes aegypti. Fast-cam filming was used to study the predation mechanism of the ambush predator, M. formosanus, on Ae. aegypti mosquito larvae. Our study indicated that M. formosanus
demonstrated 2 intermediate steps: aiming and stalking.
Currently, intermediate predation steps are either ignored or not
described for predatory copepods. The copepod’s aiming/stalking
distance varied at about 4-8 body lengths, whereas the attack distance
was shorter than the aiming distance. The stalking speed was
significantly slower than the attack speed. Copepods preferred a
cone-shaped area in front of the 1st antenna for attack compared to
behind the antenna. In conclusion, both intermediate steps,
aiming and stalking, enhanced the predatory success of an ambush
predatory copepod by targeting prey for a sudden attack.
Key words: Aiming, Stalking, Ambush predatory copepod, Mosquito larvae, Predation mechanism.
*Correspondence: Tel: 886-935289642. Fax: 886-2-24629464. E-mail:Jshwang@mail.ntou.edu.tw