Marine Biology

, Volume 88, Issue 3, pp 235–246

Reproductive energetics, endocrinology and population dynamics of Nephtys caeca and N. hombergi

  • P. J. W. Olive
  • M. G. Bentley
  • N. H. Wright
  • P. J. Morgan
Article

DOI: 10.1007/BF00392586

Cite this article as:
Olive, P.J.W., Bentley, M.G., Wright, N.H. et al. Marine Biology (1985) 88: 235. doi:10.1007/BF00392586

Abstract

An investigation of gametogenetic cycles and spawning success in populations of Nephtys caeca and N. hombergi from the River Tyne estuary, North Shields, England, in relation to production of gonadotrophic (GH) and spawning hormones (SH) has been made, based on data collected from 1978–1984. The data show that a consistent pattern of gametogenesis and efficient spawning occurs in populations of N. caeca in north-east England, but that the reproductive cycle of N. hombergi is erratic. Premature oosorption and gametogenic failure in this latter species is associated with a low level of GH production. Following high levels of GH production, gravid females sometimes fail to spawn owing to the non-release of SH. The reproductive energetics and reproductive success of N. caeca and N. hombergi are described in relation to the observed patterns of endocrine activity and the consequent changes in population structure.

Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • P. J. W. Olive
    • 1
    • 2
  • M. G. Bentley
    • 1
    • 2
  • N. H. Wright
    • 1
    • 2
  • P. J. Morgan
    • 1
    • 2
  1. 1.Department of ZoologyUniversity of Newcastle upon TyneNewcastle upon TyneEngland
  2. 2.Dove Marine LaboratoryNorth ShieldsEngland