Hydrobiologia

, Volume 73, Issue 1–3, pp 145–147 | Cite as

Metabolic uniformity over the environmental temperature range in Brachionus plicatilis (rotifera)

  • Robert W. Epp
  • William M. LewisJr.
Article

Abstract

Organisms inhabiting small water bodies frequently encounter radical, short-term fluctuations in temperature. The population of Brachionus plicatilis that was used in this study encounters temperature changes as great as 12°C in 24 hours. In this paper we describe the metabolic response to temperature change in this eurythermal rotifer population. Metabolism was determined over the environmental range (15°C to 32°C) in intervals of 2°C. Utilization of such narrow temperature intervals allowed us to approximate the instantaneous Q10, which we define as the Q10 over an infinitely small temperature interval.

Our results show the existence of a plateau in the curve of respiration against temperature (Q10 > 1) over the range 20–28°C. The plateau is bounded on either side by temperature ranges over which metabolism is temperature sensitive (Q10 values from 3.4 to 4.8). It is significant that the plateau occurs over the environmental temperature range for the major portion of the growing season. This population is thus programmed to hold a constant (preferred?) metabolic rate in spite of diel temperature fluctuations when the environment is otherwise favorable.

Keywords

Rotifers Metabolism Metabolic Rate Respiration Zooplankton 

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References

  1. Epp, R. W. & Lewis, W. M. Jr. 1979a. Metabolic responses to temperature change in a tropical freshwater copepod (Mesocyclops brasilianus) and their adaptive significance. Oecologia (in press).Google Scholar
  2. Epp, R. W. & Lewis, W. M. Jr. 1979b. Sexual dimporhism in Brachionus plicatilis (Rotifera): Evolutionary and adaptive significance. Evolution (in press).Google Scholar
  3. Pennak, R. W. 1949. Annual limnological cycles in some Colorado reservoir lakes. Ecol. Monogr. 19: 235–267.Google Scholar
  4. Prosser, C. L. 1973. Comparative Animal Physiology. Phildelphia: W. B. Saunders.Google Scholar
  5. Snedecor, G. W. & Cochran, W. G. 1976. Statistical Methods. Iowa State University Press, Ames, Iowa.Google Scholar

Copyright information

© Dr. W. Junk b.v. Publishers 1980

Authors and Affiliations

  • Robert W. Epp
    • 1
  • William M. LewisJr.
    • 1
  1. 1.Department of Environmental, Population and Organismic BiologyUniversity of ColoradoBoulderU.S.A.

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