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Widespread occurrence of the amphibian chytrid fungus in Kenya

Identifieur interne : 001917 ( Istex/Corpus ); précédent : 001916; suivant : 001918

Widespread occurrence of the amphibian chytrid fungus in Kenya

Auteurs : J. Kielgast ; D. Rödder ; M. Veith ; S. Lötters

Source :

RBID : ISTEX:B055A8EDD4DC54F01D6150F49E4A2607AC8FC569

English descriptors

Abstract

Amphibians at the global scale are dramatically declining and the pathogenic fungus Batrachochytrium dendrobatidis (Bd) has been suggested to be an important driver in this biodiversity crisis. Increasing evidence points towards the global emergence of Bd being a panzootic caused by pathogen pollution. Africa has been suggested to be the origin of the pathogen but remains one of the least‐studied areas. We have conducted the most comprehensive survey on the continent to date focusing on Kenya for investigating taxonomic and environmental components in the distribution of Bd in tropical Africa. Eleven sites along a 770 km transect from the coast up to the border of Uganda were surveyed. Using quantitative PCR, we screened 861 samples from 23 different species in nine genera. The pathogen was confirmed at all studied sites, with an overall prevalence of 31.5%. No dead or symptomatic specimens were found and no declines have been reported in the region so far. Both prevalence and parasite load ranged from the detection limit to some of the highest ever reported. The parasite load showed a significant taxonomic bias and a strong inverse correlation with temperature. Our findings suggest that Bd may be enzootic in the region. We recommend that further research should focus on comparative experimental studies of susceptibility to Bd in African species. Moreover, we stress the need for improved knowledge on the conservation status of the tropical African amphibian fauna to confirm the enzootic nature of widespread Bd infections.

Url:
DOI: 10.1111/j.1469-1795.2009.00297.x

Links to Exploration step

ISTEX:B055A8EDD4DC54F01D6150F49E4A2607AC8FC569

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J. Kielgast, Department of Biology, Section for Evolution and Microbiology, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen, Denmark.
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<b>Appendix S1.</b>
Localities sampled including altitude in m a.s.l. (see Fig. 1).</p>
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<b>Appendix S2.</b>
<i>Bd</i>
distribution within the sampled amphibian communities (species identification after Channing & Howell, 2006). Exact Clopper‐Pearson 95% Confidence intervals are presented for the prevalence. Parasite load summary statistics are based on the infected fraction of the sample.</p>
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<i>Bd</i>
in tropical Africa. Eleven sites along a 770 km transect from the coast up to the border of Uganda were surveyed. Using quantitative PCR, we screened 861 samples from 23 different species in nine genera. The pathogen was confirmed at all studied sites, with an overall prevalence of 31.5%. No dead or symptomatic specimens were found and no declines have been reported in the region so far. Both prevalence and parasite load ranged from the detection limit to some of the highest ever reported. The parasite load showed a significant taxonomic bias and a strong inverse correlation with temperature. Our findings suggest that
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<i>Bd</i>
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<abstract lang="en">Amphibians at the global scale are dramatically declining and the pathogenic fungus Batrachochytrium dendrobatidis (Bd) has been suggested to be an important driver in this biodiversity crisis. Increasing evidence points towards the global emergence of Bd being a panzootic caused by pathogen pollution. Africa has been suggested to be the origin of the pathogen but remains one of the least‐studied areas. We have conducted the most comprehensive survey on the continent to date focusing on Kenya for investigating taxonomic and environmental components in the distribution of Bd in tropical Africa. Eleven sites along a 770 km transect from the coast up to the border of Uganda were surveyed. Using quantitative PCR, we screened 861 samples from 23 different species in nine genera. The pathogen was confirmed at all studied sites, with an overall prevalence of 31.5%. No dead or symptomatic specimens were found and no declines have been reported in the region so far. Both prevalence and parasite load ranged from the detection limit to some of the highest ever reported. The parasite load showed a significant taxonomic bias and a strong inverse correlation with temperature. Our findings suggest that Bd may be enzootic in the region. We recommend that further research should focus on comparative experimental studies of susceptibility to Bd in African species. Moreover, we stress the need for improved knowledge on the conservation status of the tropical African amphibian fauna to confirm the enzootic nature of widespread Bd infections.</abstract>
<subject lang="en">
<genre>keywords</genre>
<topic>amphibian decline</topic>
<topic>Batrachochytrium dendrobatidis</topic>
<topic>chytridiomycosis</topic>
<topic>‘out of Africa’</topic>
<topic>endemic</topic>
<topic>enzootic</topic>
<topic>Kenya</topic>
<topic>Africa</topic>
</subject>
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<titleInfo>
<title>Animal Conservation</title>
</titleInfo>
<genre type="journal">journal</genre>
<note type="content"> Appendix S1. Localities sampled including altitude in m a.s.l. (see Fig. 1). Appendix S2. Bd distribution within the sampled amphibian communities (species identification after Channing & Howell, 2006). Exact Clopper‐Pearson 95% Confidence intervals are presented for the prevalence. Parasite load summary statistics are based on the infected fraction of the sample. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer‐reviewed and may be re‐organized for online delivery, but are not copy‐edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Appendix S1. Localities sampled including altitude in m a.s.l. (see Fig. 1). Appendix S2. Bd distribution within the sampled amphibian communities (species identification after Channing & Howell, 2006). Exact Clopper‐Pearson 95% Confidence intervals are presented for the prevalence. Parasite load summary statistics are based on the infected fraction of the sample. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer‐reviewed and may be re‐organized for online delivery, but are not copy‐edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Appendix S1. Localities sampled including altitude in m a.s.l. (see Fig. 1). Appendix S2. Bd distribution within the sampled amphibian communities (species identification after Channing & Howell, 2006). Exact Clopper‐Pearson 95% Confidence intervals are presented for the prevalence. Parasite load summary statistics are based on the infected fraction of the sample. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer‐reviewed and may be re‐organized for online delivery, but are not copy‐edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors.Supporting Info Item: Supporting info item - </note>
<identifier type="ISSN">1367-9430</identifier>
<identifier type="eISSN">1469-1795</identifier>
<identifier type="DOI">10.1111/(ISSN)1469-1795</identifier>
<identifier type="PublisherID">ACV</identifier>
<part>
<date>2010</date>
<detail type="title">
<title>Excerpts from the 6th World Conference of Herpetology</title>
</detail>
<detail type="volume">
<caption>vol.</caption>
<number>13</number>
</detail>
<detail type="supplement">
<caption>Suppl. no.</caption>
<number>s1</number>
</detail>
<extent unit="pages">
<start>36</start>
<end>43</end>
<total>8</total>
</extent>
</part>
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<identifier type="istex">B055A8EDD4DC54F01D6150F49E4A2607AC8FC569</identifier>
<identifier type="DOI">10.1111/j.1469-1795.2009.00297.x</identifier>
<identifier type="ArticleID">ACV297</identifier>
<accessCondition type="use and reproduction" contentType="copyright">© 2009 The Authors. Journal compilation © 2009 The Zoological Society of London</accessCondition>
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<recordOrigin>Blackwell Publishing Ltd</recordOrigin>
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