Skip to main content

Latitudinal variability in lunar spawning rhythms: absence of a lunar pattern in the northern mummichog Fundulus heteroclitus macrolepidotus

Buy Article:

$43.00 plus tax (Refund Policy)

In this study, the natural spawning season of the northern mummichog Fundulus heteroclitus macrolepidotus was examined from May to July in the lower St John River, New Brunswick, Canada (45° N), through measurements of gonado-somatic index (IG), liver-somatic index (IL) and condition factor (K). IG increased during the prespawning phase (mean ±s.e.5·49 ± 0·20%), peaked during the spawning phase (14·68 ± 0·51%) and dropped during the regression phase (3·23 ± 0·29%). A single peak of spawning was observed in F. h. macrolepidotus, contrasting with multiple peaks observed in studies south of 41° N in North America. Within the prespawning phase, there were significant differences between sampling dates in female body mass, gonad mass, liver mass and K. On the basis of results from this study, water temperature is believed to be the predominant factor controlling initiation of spawning in F. h. macrolepidotus.
No References
No Citations
No Supplementary Data
No Data/Media
No Metrics

Keywords: gonad development; per cent ripe; seasonal patterns

Document Type: Regular Paper

Affiliations: Canadian Rivers Institute, University of New Brunswick, Department of Biology, P. O. Box 5050 University of New Brunswick, Saint John, New Brunswick E2L 4L5, Canada

Publication date: 2009-09-01

  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more