Megan Gannon, News Editor
Date: 06 May 2013 Time: 01:21 PM ET
Black widow spiders get their names from the belief that the female
devours her partner after sex. But this gruesome ritual doesn't always happen after mating and sometimes, the roles are even reversed, researchers say.
devours her partner after sex. But this gruesome ritual doesn't always happen after mating and sometimes, the roles are even reversed, researchers say.
For choosy female black widows, sexual cannibalism is an extreme way to assert their partner preference, with less desirable males more likely to be chased down and eaten after they insert their sperm-coated palps into a female.
But in the species Micaria sociabilis, males are more likely to eat the females than be eaten, a new study found.
A team at Masaryk University in the Czech Republic studied how different pairings of the spiders interacted in a lab, making sure the creatures were well-fed to rule out hunger-driven cannibalism.
Males ate the females typically after the spiders' first contact and before any mating, with the culprits most often males from the summer generation, the researchers found. These males tend to be larger than their counterparts born into the spring generation, suggesting size matters in aggression.
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