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University of Tennessee professor links massive prehistoric bird extinction to human colonization
Date:4/1/2013

Research by a University of Tennessee, Knoxville professor has found that about a thousand bird species became extinct following human colonization.

Research by Alison Boyer, a research assistant professor in ecology and evolutionary biology, and an international team studied the extinction rates of nonperching land birds in the Pacific Islands from 700 to 3,500 years ago. Some of the birds studied included birds of prey and ducks. The team uncovered the magnitude of the extinctions and insight into how and why human impacts varied across the region.

The findings are published in the current issue of the Proceedings of the National Academy of Sciences.

Scientists had long known extinction rates were high but estimates varied from 800 to 2,000 species due to an incomplete fossil record on the islands. The researchers used fossil records from 41 Pacific islands such as Hawaii and Fiji to run an analytical technique called the Bayesian mark-recapture method. This allowed them to model gaps in the fossil record for more than 300 Pacific islands and estimate the number of unknown extinct species.

"We used information on what species are currently on the islands and what species are in the fossil record to estimate the probability of finding a species in the fossil record," Boyer said.

Boyer and her colleagues found that nearly 983, or two-thirds, of land bird populations disappeared between the years of the first human arrival and European colonization. Disappearances are linked to overhunting by people, forest clearance and introduced species.

"We calculate that human colonization of remote Pacific islands caused the global extinction of close to a thousand species of nonperching land birds alone," said Boyer. "However, it is likely there are more species that were affected by human presence. Sea bird and perching bird extinctions will add to this total."

Researchers found the extinction rates dif
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Contact: Whitney Heins
wheins@utk.edu
865-974-5460
University of Tennessee at Knoxville
Source:Eurekalert

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