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Life-history change in disease-ravaged Tasmanian devil populations
Jones, ME and Cockburn, A and Hamede, RK and Hawkins, CE and Hesterman, H and Lachish, S and Mann, D and McCallum, HI and Pemberton, D (2008) Life-history change in disease-ravaged Tasmanian devil populations. Proceedings of the National Academy of Sciences of the United States PNAS, 105 (29). pp. 10023-10027. ISSN 0027-8424
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Changes in life history are expected when new sources of extrinsic mortality impact on natural populations. We report a new disease, devil facial tumor disease, causing an abrupt transition from iteroparity toward single breeding in the largest extant carnivorous marsupial, the Tasmanian devil (Sarcophilus harrisii), in which males can weigh as much as 14 kg and females 9 kg. This change in life history is associated with almost complete mortality of individuals from this infectious cancer past their first year of adult life. Devils have shown their capacity to respond to this disease-induced increased adult mortality with a 16-fold increase in the proportion of individuals exhibiting precocious sexual maturity. These patterns are documented in five populations where there are data from before and after disease arrival and subsequent population impacts. To our knowledge, this is the first known case of infectious disease leading to increased early reproduction in a mammal. The persistence of both this disease and the associated life-history changes pose questions about longer-term evolutionary responses and conservation prospects for this iconic species.
|Keywords:||carnivorous marsupial, infectious cancer, wildlife disease, precocious breeding, semelparity|
|Journal or Publication Title:||Proceedings of the National Academy of Sciences of the United States PNAS|
|Page Range:||pp. 10023-10027|
|Identification Number - DOI:||10.1073/pnas.0711236105|
© 2008 by The National Academy of Sciences of the USA.
|Date Deposited:||14 Nov 2008 00:29|
|Last Modified:||18 Nov 2014 03:53|
|Item Statistics:||View statistics for this item|
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