Skip to main content
padlock icon - secure page this page is secure

Free Content Sex-Specific Life History Pattern of Emerita Portoricensis (Schmitt)

Download Article:
(PDF 485.8 kb)
The mole crab, Emerita portoricensis, often inhabits the intertidal zone of West Indian sandy beaches. Life history characteristics of this species were investigated for 2 years at four sites within the Mayagüez and Añasco bays, Puerto Rico. Survivorship (Sx) for all age classes was based on size frequency distributions. Female age-specific reproductive effort (Mx) was largely determined by carapace length and the proportion of ovigerous individuals. Male fecundity schedules were calculated assuming random mating; these were constant for all size classes but varied among months. The mean generation time of males was shorter than that of females. The number of eggs produced by adult females (SxMx) had a tendency to increase with age initially with a later decrease. The male contribution to offspring (SxNx) decreased with age. Fisher's reproductive value (Vx) was used to determine age specific contribution to population growth rates. Vx of females tended to increase with age but started to decrease at older age intervals. Reproductive values (Vx) of males decreased from the age of first reproduction to the age of last reproduction. These results suggest that young adult males and older females should have a selective advantage over other age (size) classes. These contribute most to population growth rates.

36 References.

No Supplementary Data.
No Article Media
No Metrics

Document Type: Research Article

Publication date: 01 May 1992

More about this publication?
  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • Ingenta Connect is not responsible for the content or availability of external websites
  • 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
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