A study finds that human activity has led to a severe decrease in Caribbean shark abundance.
Image credit: Sean Mattson (International Center for Tropical Agriculture, Cali, Colombia).
Edited by James O’Connell, University of Utah, Salt Lake City, UT, and approved April 9, 2013 (received for review February 12, 2013)
Abstract
Around 88 large vertebrate taxa disappeared from Sahul sometime during the Pleistocene, with the majority of losses (54 taxa) clearly taking place within the last 400,000 years. The largest was the 2.8-ton browsing Diprotodon optatum, whereas the ∼100- to 130-kg marsupial lion, Thylacoleo carnifex, the world’s most specialized mammalian carnivore, and Varanus priscus, the largest lizard known, were formidable predators. Explanations for these extinctions have centered on climatic change or human activities. Here, we review the evidence and arguments for both. Human involvement in the disappearance of some species remains possible but unproven. Mounting evidence points to the loss of most species before the peopling of Sahul (circa 50–45 ka) and a significant role for climate change in the disappearance of the continent’s megafauna.
Footnotes
- ↵1To whom correspondence should be addressed. E-mail: judith.field{at}unsw.edu.au.
Author contributions: S.W. and J.H.F. designed research; S.W., J.H.F., G.J.P., and J.L. performed research; G.J.P., J.L., J.T.F., and S.D.M. analyzed data; and S.W., J.H.F., M.A., D.K.G., J.T.F., G.E.W., I.D., and S.D.M. wrote the paper.
The authors declare no conflict of interest.
This article is a PNAS Direct Submission.
This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1302698110/-/DCSupplemental.
Climate change and megafaunal extinction in Sahul
Article Classifications
- Biological Sciences
- Anthropology
- Physical Sciences
- Earth, Atmospheric, and Planetary Sciences
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