The Effect of the Food Concentration and Predator Density to the Distributional Pattern of Daphnia

먹이농도와 포식자의 밀도가 Daphnia의 분포유형에 미치는 영향

  • La, Geung-Hwan (Department of Biology, Pusan National University) ;
  • Jeong, Hyun-Gi (Department of Biology, Pusan National University) ;
  • Kim, Hak-Pyo (Department of Biological Science, Ulsan University) ;
  • Shin, Mann-Kyoon (Department of Biological Science, Ulsan University) ;
  • Kim, Hyun-Woo (Department of Environmental Education, Sunchon National University) ;
  • Joo, Gea-Jae (Department of Biology, Pusan National University)
  • Published : 2007.06.30

Abstract

The effects of food concentration (Chlorella vulgaris) and predator (Pseudorasbora parva) density on the distributional pattern of Daphnia pulex was evaluated in observation chambers. It was found that in the chamber with higher food concentration, Daphnia began to aggregate and formed tighter swarms. The close distance between each individual and distance from the center of swarm were observed in higher food conditions however, this distributional pattern was not seen in the chamber without food. Thus it suggests that the food is necessary for the swarming behavior of Boptnia in natural habitat. The swarming developed regardless of predator existence and the predator density did not affect swarming pattern of Daphnia.

Keywords

References

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