A hitchhiker's guide to the Galapagos: co-evolution of Galapagos mockingbirds and their parasites

Oct 03, 2011
This is a Hood Mockingbird. Credit: Jan Stefka

Along with the famous finches the Galapagos mockingbirds had a great influence on Charles Darwin's theory of evolution. Now, 176 years later, three of the four mockingbird species are among the rarest birds in the world. New research published in BioMed Central's open access journal BMC Evolutionary Biology untangles the evolutionary relationships between Galápagos mockingbirds and provides information about their parasites to help ensure the birds survival.

Researchers from the University of South Bohemia in the Czech Republic, the Natural History Museum London, and the University of Zurich in Switzerland used three parasites specific to the to reveal their coevolutionary history. Mitochondrial and nuclear DNA from the mockingbirds, their feather mites, and also two species of parasitic louse was sequenced. The least host-specific louse showed no pattern of co-evolution with the mockingbirds, but the two other parasites showed very similar evolutionary histories.

Jan Štefka, lead author of the research, said, "Combining DNA data from several organisms that share their history, improves our confidence in the evolutionary patterns we see. In this case the host specific parasites reveal more about the recent evolution of the mockingbirds than the bird data in isolation." He continued, "These results have implications for the conservation and taxonomy of Galápagos mockingbirds. For example the critically endangered Floreana mockingbird is now extinct on the island of Floreana. However, to our surprise, the number of parasites on one of the remaining populations was much less than expected. This suggests that the infestation was probably due to a recent introduction of the parasite from a different island."

Paquita Hoeck from the University of Zurich adds, "Hosts and parasites evolve specific adaptations when living in isolation. To avoid the undesirable spread of parasites or pathogens after a planned re-introduction of mockingbirds back to Floreana, different histories of parasites in the two remaining satellite populations need to be considered."

Explore further: Game theory analysis shows how evolution favors cooperation's collapse

More information: A hitchhikers guide to the Galapagos: co-phylogeography of Galapagos mockingbirds and their parasites, Jan Stefka, Paquita EA Hoeck, Lukas F Keller and Vincent S Smith, BMC Evolutionary Biology (in press)

add to favorites email to friend print save as pdf

Related Stories

Recommended for you

Warming world may spell bad news for honey bees

15 minutes ago

Researchers have found that the spread of an exotic honey bee parasite -now found worldwide - is linked not only to its superior competitive ability, but also to climate, according to a new study published ...

Students create microbe to weaken superbug

1 hour ago

A team of undergraduate students from the University of Waterloo have designed a synthetic organism that may one day help doctors treat MRSA, an antibiotic-resistant superbug.

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.