Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

Time Cues for Semilunar Reproduction Rhythms in European Populations of Clunio marinus. II. The Influence of Tidal Temperature Cycles

Dietrich Neumann and Fred Heimbach
Biological Bulletin
Vol. 166, No. 3 (Jun., 1984), pp. 509-524
DOI: 10.2307/1541158
Stable URL: http://www.jstor.org/stable/1541158
Page Count: 16
  • Subscribe ($19.50)
  • Cite this Item
Time Cues for Semilunar Reproduction Rhythms in European Populations of Clunio marinus. II. The Influence of Tidal Temperature Cycles
Preview not available

Abstract

Breeding experiments with the intertidal midge Clunio demonstrate that tidal temperature cycles combined with the 24-h light-dark cycle can act as time cues controlling the semilunar (syn. lunar-semi-monthly) timing mechanism of the animals, thereby regulating the semilunar emergence rhythm of the population. The two environmental cycles are in identical phase relationships every 15 days. Two types of temperature cycles were examined, sinusoidal fluctuations and short term pulses of 1.5 h (3-5°C amplitude and 12.4 h period each). Comparing the entrained semilunar rhythms in terms of phase relationship to the time cues, the end of the warming interval seems to be the decisive parameter of the tidal temperature changes. The combined exposure to tidal temperature cycles and tidal cycles of mechanical disturbances of the water (an additional time cue in the populations examined) resulted in the correct semilunar synchronization when the temperature rises and the mechanical disturbances alternated as in a natural tidal cycle. The results from three stocks representing different geographical races are discussed in relation to the amplitude of tidal temperature changes in nature, to weak and strong influences of the time cues, to their perception, and to the phase relationship between rhythms and time cues in the experiments and in nature.

Page Thumbnails

  • Thumbnail: Page 
509
    509
  • Thumbnail: Page 
510
    510
  • Thumbnail: Page 
511
    511
  • Thumbnail: Page 
512
    512
  • Thumbnail: Page 
513
    513
  • Thumbnail: Page 
514
    514
  • Thumbnail: Page 
515
    515
  • Thumbnail: Page 
516
    516
  • Thumbnail: Page 
517
    517
  • Thumbnail: Page 
518
    518
  • Thumbnail: Page 
519
    519
  • Thumbnail: Page 
520
    520
  • Thumbnail: Page 
521
    521
  • Thumbnail: Page 
522
    522
  • Thumbnail: Page 
523
    523
  • Thumbnail: Page 
524
    524