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Raw data is presented as Additional file 1. Polyandry is commonly maintained by direct benefits in gift-giving species, so females may remate as an adaptive foraging strategy. However, the assumption of a direct benefit fades in mating systems where male gift-giving behaviour has evolved from offering nutritive to worthless non-nutritive items. We therefore predicted female receptivity to be independent of hunger in this species. We exposed poorly-fed and well-fed females to multiple males offering nutritive gifts and well-fed females to males offering worthless gifts.

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Spider Penis Detaches After Sex To Help Male Orb Spider Fight For Female

Females of a gift-giving spider do not trade sex for food gifts: a consequence of male deception?

After leaving its detachable penis to finish inseminating the female, the male orb-web spider fights to the death to protect the impregnated gal. Without the extra weight of its sexual organs, this spider can outlast its competition, new research has found. Though the spider loses its palp the arachnid equivalent of a penis, and the male orb-web spider has two , it usually wins the fight to protect his mate from other males. Several types of male spiders and other insects engage in risky sex, which, in the orb-web spider Nephilengys malabarensis , ends in about 75 percent of them being eaten by the female.
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After leaving its detachable penis to finish inseminating the female, the male orb-web spider fights to the death to protect the impregnated gal. Without the extra weight of its sexual organs, this spider can outlast its competition, new research has found. Though the spider loses its palp the arachnid equivalent of a penis, and the male orb-web spider has two , it usually wins the fight to protect his mate from other males. Several types of male spiders and other insects engage in risky sex, which, in the orb-web spider Nephilengys malabarensis , ends in about 75 percent of them being eaten by the female. But, even if they escape their mate's grasp, they lose one or both of their palps along the way.
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By David Robson. Female redback spiders kill and eat partners that demand quick sex in place of extended courtship. In contrast, a little bit of wooing goes a long way in arousing her passions for the male, new research reveals. Jeffrey Stoltz from the University of Toronto Scarborough, Canada, studied the courting habits of redback spiders by setting up females with either one or two males.
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