Scientists have found that not only do brown widows hone in on black widows, but they go relatively light on other spiders that share the same shadowy haunts.
Bill Kearney | South Florida Sun-Sentinel
The Southern black widow spider, seen here, has been driven out of urban and suburban areas by its aggressive non-native cousin, the brown widow. In addition to living in the dark, cobweb spiders don’t have very good vision, Coticchio said. How do they tell who’s who under a backyard shed? He and other scientists suspect that they have hairs on their bodies that they use for sensing wind, vibration and chemicals, or pheromones.
“We observed Brown Widows boldly ‘testing’ their neighbor’s web during forays beyond their web matrix, a behavior that we did not observe in the Southern Black Widow or the cobweb spiders,” he wrote in the paper. When face-to-face, “they engaged in rapid bouts of ‘slapping’ each other’s forelegs and tarsae.”
In the real world, such as under a shed, the two species would compete for space, and the younger brown widows would dominate and eat the hatchling black widow.
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