Post-mating effects in the grasshopper, Gomphocerus rufus L. mediated by the spermatheca |
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Authors: | R Hartmann W Loher |
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Institution: | Biologisches Institut 1, Universit?t Freiburg, D-79104 Freiburg, Germany, DE Division of Insect Biology, University of California at Berkeley, CA 94720, USA, US
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Abstract: | In the female grasshopper Gomphocerus rufus mating replaces copulatory readiness with immediate and long-lasting `secondary defense', during which further mating attempts
are efficiently repelled. The behavioral change is caused by secretions from the male accessory glands' white secretory tubule
1 which is injected with the spermatophore material into the female's spermathecal duct. A bristle field of contact chemoreceptors
at the entry of the spermathecal duct into the endbulb is assumed to be stimulated by the secretion. Ablation of the bristle
field, interruption of the nervous pathway between the spermatheca and the ventral nervecord, or severance of the latter sustains
sexual receptivity after mating. Both the secretion from white secretary tubule 1 and the spermatophore contained in the spermatheca
of a mated female are digested by proteolytic enzymes from spermathecal gland cells. Dissolved material is resorbed by similar
glandular-like cells. The intersexual conflicts of interest and their evolutionary consequences are discussed.
Accepted: 4 December 1998 |
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Keywords: | Grasshopper Defensive behavior Spermatheca Contact chemoreceptors Accessory gland secretion |
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