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Reproduction in the amphipod, Echinogammarus marinus: a comparison between normal and intersex specimens
Ford, A.T.; Fernandes, T.F.; Rider, S.A.; Read, P.A.; Robinson, C.D.; Davies, I.M. (2003). Reproduction in the amphipod, Echinogammarus marinus: a comparison between normal and intersex specimens. J. Mar. Biol. Ass. U.K. 83(5): 937-940
In: Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge. ISSN 0025-3154, more
Peer reviewed article  

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Keywords
    Eggs; Embryonic development; Fecundity; Sexual reproduction; Echinogammarus marinus (Leach, 1815) [WoRMS]; ANE, British Isles, Scotland [Marine Regions]; Marine

Authors  Top 
  • Ford, A.T.
  • Fernandes, T.F.
  • Rider, S.A.
  • Read, P.A.
  • Robinson, C.D.
  • Davies, I.M., more

Abstract
    The fecundity and occurrence of intersexuality in the amphipod, Echinogammarus marinus, collected from populations on the east coast of Scotland are reported. Intersex specimens have significantly smaller mean brood sizes than normal specimens. Embryo survival, as measured by the ratio of eggs/embryos in early and late stages of development, is lower in intersex specimens than normal specimens. Greater differences in the number of early stage eggs compared with late stage eggs in intersex specimens is suggested to arise by the active ejection of non-viable eggs, or from the passive loss of eggs through malformed brood plates in females. An apparent reduction in brood sizes between early and late stages of development in ‘normal’ specimens, emphasizes the importance of quantifying different egg/embryo stages in amphipod toxicology and fecundity studies.

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