TY - JOUR
T1 - Chytrid fungus infections in laboratory and introduced Xenopus laevis populations
T2 - Assessing the risks for U.K. native amphibians
AU - Tinsley, Richard C.
AU - Coxhead, Peter G.
AU - Stott, Lucy C.
AU - Tinsley, Matthew C.
AU - Piccinni, Maya Z.
AU - Guille, Matthew J.
PY - 2015/4/1
Y1 - 2015/4/1
N2 - The chytrid fungus Batrachochytrium dendrobatidis (. Bd) is notorious amongst current conservation biology challenges, responsible for mass mortality and extinction of amphibian species. World trade in amphibians is implicated in global dissemination. Exports of South African Xenopus laevis have led to establishment of this invasive species on four continents. Bd naturally infects this host in Africa and now occurs in several introduced populations. However, no previous studies have investigated transfer of infection into co-occurring native amphibian faunas. A survey of 27 U.K. institutions maintaining X. laevis for research showed that most laboratories have low-level infection, a risk for native species if animals are released into the wild. RT-PCR assays showed Bd in two introduced U.K. populations of X. laevis, in Wales and Lincolnshire. Laboratory and field studies demonstrated that infection levels increase with stress, especially low temperature. In the U.K., native amphibians may be exposed to intense transmission in spring when they enter ponds to spawn alongside X. laevis that have cold-elevated Bd infections. Exposure to cross-infection has probably been recurrent since the introduction of X. laevis, 20. years in Lincolnshire and 50. years in Wales. These sites provide an important test for assessing the impact of X. laevis on Bd spread. However, RT-PCR assays on 174 native amphibians (. Bufo, Rana, Lissotriton and Triturus spp.), sympatric with the Bd-infected introduced populations, showed no foci of self-sustaining Bd transmission associated with X. laevis. The abundance of these native amphibians suggested no significant negative population-level effect after the decades of co-occurrence.
AB - The chytrid fungus Batrachochytrium dendrobatidis (. Bd) is notorious amongst current conservation biology challenges, responsible for mass mortality and extinction of amphibian species. World trade in amphibians is implicated in global dissemination. Exports of South African Xenopus laevis have led to establishment of this invasive species on four continents. Bd naturally infects this host in Africa and now occurs in several introduced populations. However, no previous studies have investigated transfer of infection into co-occurring native amphibian faunas. A survey of 27 U.K. institutions maintaining X. laevis for research showed that most laboratories have low-level infection, a risk for native species if animals are released into the wild. RT-PCR assays showed Bd in two introduced U.K. populations of X. laevis, in Wales and Lincolnshire. Laboratory and field studies demonstrated that infection levels increase with stress, especially low temperature. In the U.K., native amphibians may be exposed to intense transmission in spring when they enter ponds to spawn alongside X. laevis that have cold-elevated Bd infections. Exposure to cross-infection has probably been recurrent since the introduction of X. laevis, 20. years in Lincolnshire and 50. years in Wales. These sites provide an important test for assessing the impact of X. laevis on Bd spread. However, RT-PCR assays on 174 native amphibians (. Bufo, Rana, Lissotriton and Triturus spp.), sympatric with the Bd-infected introduced populations, showed no foci of self-sustaining Bd transmission associated with X. laevis. The abundance of these native amphibians suggested no significant negative population-level effect after the decades of co-occurrence.
KW - African clawed frog
KW - Chytrid fungus (Bd)
KW - Emerging infectious disease (EID)
KW - Global spread of pathogens
KW - Invasive species
KW - Threats to native species
UR - http://www.scopus.com/inward/record.url?scp=84924193791&partnerID=8YFLogxK
U2 - 10.1016/j.biocon.2015.01.034
DO - 10.1016/j.biocon.2015.01.034
M3 - Article (Academic Journal)
C2 - 25843959
AN - SCOPUS:84924193791
VL - 184
SP - 380
EP - 388
JO - Biological Conservation
JF - Biological Conservation
SN - 0006-3207
ER -