Journal of Environmental BiologypISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP |
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Abstract - Issue Jul 2007, 28 (3) BackCalculation of search volume
on cruise-searching planktivorous fish in foraging
model Bae Kyung Park1,
Yong Seok Lee2 and Seok
Soon Park*3 *ssp@ewha.ac.kr Pyeong-ri, Dasan-myeon,
Goryeong-gun, Gyeongsangbuk-do
717-873, 2Department of Health and Environment, 3Department of Environmental Science and Engineering, Daehyun-dong, Seodaemun-gu, (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
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