The return of the frogs: the importance of habitat refugia in maintaining diversity during a disease outbreak

McKnight, Donald T., Lal, Monal M., Bower, Deborah S., Schwarzkopf, Lin, Alford, Ross A., and Zenger, Kyall R. (2019) The return of the frogs: the importance of habitat refugia in maintaining diversity during a disease outbreak. Molecular Ecology, 28 (11). pp. 2731-2745.

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Recent decades have seen the emergence and spread of numerous infectious diseases, often with severe negative consequences for wildlife populations. Nevertheless, many populations survive the initial outbreaks, and even undergo recoveries. Unfortunately, the long-term effects of these outbreaks on host population genetics are poorly understood; to increase this understanding, we examined the population genetics of two species of rainforest frogs (Litoria nannotis and Litoria serrata) that have largely recovered from a chytridiomycosis outbreak at two national parks in the Wet Tropics of northern Australia. At the wetter, northern park there was little evidence of decreased genetic diversity in either species, and all of the sampled sites had high minor allele frequencies (mean MAF = 0.230-0.235), high heterozygosity (0.318-0.325), and few monomorphic markers (1.4%-4.0%); however, some recovered L. nannotis populations had low N-e values (59.3-683.8) compared to populations that did not decline during the outbreak (1,537.4-1,756.5). At the drier, southern park, both species exhibited lower diversity (mean MAF = 0.084-0.180; heterozygosity = 0.126-0.257; monomorphic markers = 3.7%-43.5%; N-e = 18.4-676.1). The diversity patterns in this park matched habitat patterns, with both species having higher diversity levels and fewer closely related individuals at sites with higher quality habitat. These patterns were more pronounced for L. nannotis, which has lower dispersal rates than L. serrata. These results suggest that refugia with high quality habitat are important for retaining genetic diversity during disease outbreaks, and that gene flow following disease outbreaks is important for re-establishing diversity in populations where it was reduced.

Item ID: 60071
Item Type: Article (Research - C1)
ISSN: 1365-294X
Keywords: chytridiomycosis, emerging infectious diseases, population genetics
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Copyright Information: © 2019 John Wiley & Sons Ltd
Additional Information:

A version of this publication was included as Chapter 3 of the following PhD thesis: McKnight, Donald T. (2019) Life finds a way: the recovery of frog populations from a chytridiomycosis outbreak. PhD thesis, James Cook University, which is available Open Access in ResearchOnline@JCU. Please see the Related URLs for access.

Funders: Australian Research Council (ARC), Department of Environmental Heritage Protection (DEHP)
Projects and Grants: ARC DP130101635, DEHP WIK16243115
Date Deposited: 24 Jul 2019 08:04
FoR Codes: 30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3009 Veterinary sciences > 300906 Veterinary immunology @ 25%
41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410401 Conservation and biodiversity @ 75%
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