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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Jul 2007, 28 (3)                                                                                                             Back


Calculation of search volume on cruise-searching planktivorous fish in foraging model


Bae Kyung Park1, Yong Seok Lee2 and Seok Soon Park*3


1Nakdong River Water Environmental Research Center, National Institute of Environmental Research,

Pyeong-ri, Dasan-myeon, Goryeong-gun, Gyeongsangbuk-do 717-873, South Korea

2Department of Health and Environment, Hallym College, 790, Chuncheon, Kangwon-do 200-711, South Korea

3Department of Environmental Science and Engineering, Ewha Womans University, 11-1,

Daehyun-dong, Seodaemun-gu, Seoul 120-750, South Korea

(Received: February 16, 2006 ; Revised received: November 06, 2006 ; Accepted: December 09, 2006)

Abstract: Search volume of cruising planktivorous fish was calculated based on its detailed behavior. To examine the factors influencing search volume, a series of experiments were conducted by varying ambient conditions, such as structural complexity, light intensity, and turbidity. Pseudorasbora parva were used in experiment as predator and Daphnia pulex was selected as prey. The shape of scanning area of P. parva showed elliptic and the search volume changed drastically depending on ambient conditions. Compared with the results of previous foraging model, the search volumes of the fish under previous study were larger (1.2 to 2.4 times) than those from our study. These results on the changes in feeding rate can be useful in determining microhabitat requirement of P. parva and other cyprinids with a similar foraging behavior. The calculated search volume is compared with other foraging model and the effect of zooplankton-planktivore interactions on aquatic ecosystem is discussed.

Key words : Prey encounter, Pseudorasbora parva, Reactive distance, Scanning area, Searching speed

PDF file of full length paper is available with author


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