• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1999 Fiscal Year Final Research Report Summary

Study on the effects of aquatic vegetation on foraging behaviour of planktivores in lakes

Research Project

Project/Area Number 10450179
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 水工水理学
Research InstitutionSaitama University

Principal Investigator

ASAEDA Takashi  Saitama Univ., Grad. School of Sci. and Eng., Assoc. Prof., 大学院・理工学研究科, 助教授 (40134332)

Co-Investigator(Kenkyū-buntansha) FUJINO Takeshi  Saitama Univ., Grad. School of Sci. and Eng., Res. Assoc., 大学院・理工学研究科, 助手 (70282431)
CA THANH Vu  Saitama Univ., Faculty of Eng., Assoc. Prof., 工学部, 助教授 (60261880)
Project Period (FY) 1998 – 1999
Keywordsplanktivores / swimming / vegetation / foraging efficiency / Daphnia / Satiation / Pseudorasbora parva / lake
Research Abstract

In littoral zones of lakes, macrophytes have considerable structural variation and that provides protection to prey communities by hindering predator foraging. The swimming and feeding behaviour of a planktivore (Pseudorasbora parva) with their prey (Daphnia pulex) were studied in a series of laboratory experiments with varying densities of simulated submerged vegetation. Prey availability was varied from 0.5, 1, 2, 5, 10 and 25 prey.lィイD1-1ィエD1. As the stem density gradually increased, the predator's foraging efficiency decreased considerably relative to feeding in open water. Moreover, a good relation in feeding rate and swimming speed existed with the average stem distance to fish body length ratio. Abrupt reduction in feeding and swimming was recorded when fish body length ratio was near 0.7, which is approximately equal to one stride length of a fish.
In fish, hunger increases the motivation to feed and also efficiency of feeding. After 36 hours of food deprivation, the feeding and swimming behaviour of Pseudorasbora parva was studied under different prey densities. The initial feeding rates showed marked variations in relation to prey availability. Under high densities the initial feeding rate of fish was higher and subsequently decreased faster, when compared to those feeding under low prey densities. At high prey densities, two factors are involved : that of high prey encounter rates and also the attainment of food satiation at a faster rate. Across all prey densities, the feeding rates of fish reached a plateau after satiation. The swimming speed was noted as being directly related to the level of satiation. After satiation, the fish fed at a steady rate irrespective of prey density. However, the swimming speed of fish varied significantly in relation to prey density. It was found that the maximum feeding rates depend upon and show a marked variation with average prey distance.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] J.Manatunge & T.Asaeda: "Optimal foraging as the criteria of prey selection by two centrarchid fishes"Hydrobiologia. 391. 223-240 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Asaeda & K.Acharya: "Application of individual growth and population models of Daphnia pulex to Daphnia magna, Daphnia galeata and Bosmina longirostris"Hydrobiologia. (印刷中). 1-15 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Asaeda & K.Acharya: "Numerical simulations using a populations model of three cladoreran species in a single-species and a competition environment"Mar.Freshwater Res.. (印刷中)51. 1-14 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Asaeda & S.Karunaratne: "Dynamic modeling of the growth of Phrag mites'australis : model description"Aquatic Botany. (印刷中)1407. 1-19 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.Manatunge,T.Asaeda,D.G.Tilak Priyadashana: "The influence of structural complexity on fish-zooplankton interaction : a study using artifical sabmerged macrophytes"Environmental Fish Biology. (印刷中). 1-14 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J. Manatunge & T. Asaeda: "Optimal foraging as the criteria of prey selectivity by two centrarchid fishes"Hydrobiologia. Vol. 391. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J. Manatunge, T. Asaeda & T. Priyadarshana.: "The influence of structural complexity on fish-zooplankton interaction : a study using artificial submerged macrophytes"Environmental Fish Biology. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Asaeda and S. Karunaratne: "Dynamic Modeling of the Growth of Phragmites australis : Model"Aquatic Botany. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Asaeda & K. Acharya: "Application of individual growth and population models of Daphnia pulex to Daphnia magna, Daphnia galeata and Bosmina longirostris"Hydrobiologia. (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Asaeda & K. Acharya: "Numerical simulations using a populations model of three cladoceran species, Daphnia magna, D. galeata and Bosmina longirostris, in a single-species and a competition environment"Mar. Freshwater Res.. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2001-10-23  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi