"Potential Fertility and Egg Development (Volume, Water, Lipid, and Fat" by Joana Figueiredo, Gil Penha-Lopes et al.
 

Marine & Environmental Sciences Faculty Articles

Potential Fertility and Egg Development (Volume, Water, Lipid, and Fatty Acid Content) Through Embryogenesis of Uca rapax (Decapoda: Brachyura: Ocypodidae)

ORCID

0000-0001-6597-0268

Document Type

Article

Publication Title

Journal of Crustacean Biology

ISSN

0278-0372

Publication Date

7-2008

Keywords

Brachyura, Crabs, Development, Ecology, Fatty acids, Reproduction, Uca

Abstract

We examined potential fertility, egg volume, and water, lipid, and fatty acid content through embryogenesis in a population of female U. rapax from Sebastian Inlet, Florida. Carapace width (CW) ranged from 10.80 to 20.09 mm (N = 184), and each female carried 5000 to 30,000 eggs in the last stage of development. Female CW was found to be a good predictor of the number of eggs in the later stage of development (potential fertility = 7.908 CW2.7655, R2= 0.749). Egg volume increases (from 0.0079 to 0.0134 mm3) was mildly correlated (r = 0.79) with an increase in egg water content (from 60 to 69%). Egg lipid and fatty acid content decreased through embryogenesis, due to its importance as energy source. The most consumed fatty acids were the monounsaturated (97.81 μg . mg dw−1) followed by the saturated (64.34 μg · mg dw−1) and polyunsaturated (38.69 μg · mg dw−1). Fatty acids 16:0, 18:2n-6, 16:1n-7, and 18:2n-6 are consumed preferentially (39.91, 38.45, 29.4 and 23.93 μg · mg dw−1, respectively), while essential polyunsaturated fatty acids, particularly docosahexaenoic acid (22:6n-3) and eicosapentaenoic acid (20:5n-3), are conserved. Egg fatty acid profile also reflects diet and habitat of adults. A medium-low EPA/DHA ratio suggests U. rapax occupies a medium trophic level. The low ratio (18:1n-7/18:1n-9) and high percentages of 18:1n-9 fatty acid (18%) and essential C18 and C20 polyunsaturated fatty acids (19-23%) suggests adults are omnivores consuming primary producers (like algae and mangrove leaves) and small invertebrates. The high percentage of odd-numbered fatty acids (above 3-3.5%) also suggests scavenger/detritivore behaviour.

DOI

10.1651/07-2937R.1

Volume

28

Issue

3

First Page

528

Last Page

533

Comments

©The Crustacean Society, 2008. Published by Brill NV, Leiden

This document is currently not available here.

Peer Reviewed

Find in your library

Plum Print visual indicator of research metrics
PlumX Metrics
  • Citations
    • Citation Indexes: 26
  • Usage
    • Abstract Views: 1
  • Captures
    • Readers: 27
see details

Share

COinS