Chemical Mediation of Larval Release Behaviors in the Crab Neopanope sayi

The Biological Bulletin
M C De VriesRichard B Forward

Abstract

Control of egg hatching was investigated in ovigerous females of the crab Neopanope sayi. Larval release is a brief event, generally lasting less than 15 min, during which females perform stereotypic behaviors involving vigorous abdomen pumping. Substances released by hatching eggs (pumping factors) of N. sayi, Rhithropanopeus harrisii, and Uca pugilator, but not Sesarma cinereum, evoked these stereotypic behaviors (pumping response) in ovigerous N. sayi. Spontaneous pumping and responsiveness to pumping factors varied with the age of the embryos. These results indicate that the eggs release pheromones around the time of hatching, which supports the general model for egg-hatching control described for R. harrisii (Forward and Lohmann, 1983). The chemistry of N. sayi pumping factors was investigated, and the pumping response was used as a bioassay in this study. Pumping factors adsorbed to Amberlite XAD-7 resin and could be eluted from it with methanol. Size fractionation by cascade pressure dialysis showed that the active molecules were <1000 daltons. Acid hydrolysis followed by reverse-phase HPLC amino acid analysis showed that the biologically active fraction contained peptides. Cysteine, glycine, methionine, and isoleucine w...Continue Reading

Citations

Jul 20, 2007·Journal of Chemical Ecology·Tracy A Ziegler, Richard B Forward
Feb 21, 2006·Journal of Experimental Zoology. Part A, Comparative Experimental Biology·Hideki IkedaMasayuki Saigusa
Sep 5, 2008·Rehabilitation Nursing : the Official Journal of the Association of Rehabilitation Nurses·Cheryl Lehman
Oct 1, 1993·International Journal of Peptide and Protein Research·R J PettisD Rittschof
Sep 18, 2004·Peptides·Dan Rittschof, Jonathan H Cohen

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