Bird Feeders, Pornography, and Other Evolutionary Traps

Posted on 9th June 2013 by Ryan Somma in Ionian Enchantment
Maladaptations
“Examples of animals exhibiting maladaptive responses to evolutionary novel objects and becoming trapped. (A) A Cuban tree frog (Osteopilus septentrionalis) ingesting a decorative light that mimics the bioluminescent qualities of its insect prey. (B) A black-footed albatross (Phoebastria nigripes) killed by the ingestion of small, often colorful, floating garbage that mimics food items. (C) A giant jewel beetle (Julodimorpha bakewelli) attempting to mate with a beer bottle that produces supernormal strengths of coloration and reflection cues associated with female conspecifics [74]. (D) Mayflies blanketing, mating, and ovipositing on a storefront window that strongly reflects horizontally polarized light, their primary habitat selection cue in locating natural water bodies.”
Credit: (Source) Images by James Snyder (A), Chris Jordan (B), Darryl Gwynne (C), and Will Milne (D) (Copyrighted, reproduced here as fair use).

Carl Zimmer has an article summarizing the research presented by Robertson, Rehage, and Sih concerning evolutionary traps, when “rapid environmental change triggers organisms to make maladaptive behavioral decisions.” In other words, we change the environment in ways that cause animals to exhibit behaviors harmful to themselves.

Zimmer gives the example of the albatross, which “will peck at brightly colored pieces of plastic floating in the water, for example. It’s a response that used to give them energy but now can fill their guts with trash.” Witherington gives the example of sea turtles, which “have evolved the tendency to migrate toward the light of the moon upon emerging from their sand nests. However, in the modern world, this has resulted in them tending to orient towards bright beach-front lighting, which is a more intense light source than the moon. As a result the hatchlings migrate up the beach and away from the ocean where they exhaust themselves, desiccate and die either as a result of exhaustion, dehydration or predation.” Sea turtles also mistake plastic bags for jellyfish and consume them. In 2011 Darryl Gwynne and David Rentz won an IgNobel for their research on the giant jewel beetle, which attempts to mate with a certain brand of beer bottle because they exhibit “supernormal strengths of coloration and reflection cues associated with female conspecifics.”

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