August 28, 2007

An Inordinate Fondness for Beetles, etc.

If one were to lapse into the fallacies embodied by Intelligent Design, one would come to some very interesting conclusions about the Designer when confronted by an insect species in which the female mates to quench her thirst. My my my, what was that crazy designer thinking?

Sex is thirst-quenching for female beetles

Female beetles mate to quench their thirst according to new research by a University of Exeter biologist. The males of some insect species, including certain types of beetles, moths and crickets, produce unusually large ejaculates, which in some cases can account for around 10% of their body weight. The study shows that dehydrated females can accept sexual invitations simply to get hold of the water in the seminal fluid.

Dr Martin Edvardsson, whose research is published in the journal Animal Behaviour (August 2007), studied the bruchid beetle Callosobruchus maculatus, a serious pest in warmer parts of the world. Some females were given unlimited access to water while others were not. All females were free to mate with males and the study found that thirsty females mated 40% more frequently than those with free access to water.

Female bruchid beetles can absorb the water in the seminal fluid through their reproductive tracts and need to mate less frequently the more water they take from each mating. This is to a male’s advantage because the longer the female goes without mating with another male, the greater his chance of successful fertilization. By transferring a large amount of water with the sperm, a male can help ensure his sperm has more time to fertilize the eggs without having to compete with the sperm from future matings. Dr Martin Edvardsson of the University of Exeter says: ‘The large ejaculates may have evolved because males can make it less beneficial for females to remate by providing them with a large amount of water.’...
It has been said, tongue planted firmly in cheek, that the hypothetical deity has an "inordinate fondness for beetles." What else suggests itself as an "inordinate fondness" in light of this discovery?

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