Pathogen invasion history elucidates contemporary host pathogen dynamics
Autoři:
Vance T. Vredenburg aff001; Samuel V. G. McNally aff001; Hasan Sulaeman aff001; Helen M. Butler aff001; Tiffany Yap aff001; Michelle S. Koo aff002; Dirk S. Schmeller aff004; Celeste Dodge aff001; Tina Cheng aff001; Gordon Lau aff001; Cheryl J. Briggs aff005
Působiště autorů:
Department of Biology, San Francisco State University, San Francisco, California, United States of America
aff001; Museum of Vertebrate Zoology, University of California Berkeley, Berkeley, California, United States of America
aff002; Center for Biological Diversity, Oakland, California, United States of America
aff003; EcoLab, Université de Toulouse, Toulouse, France
aff004; Department of Ecology Evolution and Marine Biology, University of California Santa Barbara, Santa Barbara, California, United States of America
aff005
Vyšlo v časopise:
PLoS ONE 14(9)
Kategorie:
Research Article
prolekare.web.journal.doi_sk:
https://doi.org/10.1371/journal.pone.0219981
Souhrn
Amphibians, the most threatened group of vertebrates, are seen as indicators of the sixth mass extinction on earth. Thousands of species are threatened with extinction and many have been affected by an emerging infectious disease, chytridiomycosis, caused by the fungal pathogen, Batrachochytrium dendrobatidis (Bd). However, amphibians exhibit different responses to the pathogen, such as survival and population persistence with infection, or mortality of individuals and complete population collapse after pathogen invasion. Multiple factors can affect host pathogen dynamics, yet few studies have provided a temporal view that encompasses both the epizootic phase (i.e. pathogen invasion and host collapse), and the transition to a more stable co-existence (i.e. recovery of infected host populations). In the Sierra Nevada mountains of California, USA, conspecific populations of frogs currently exhibit dramatically different host/ Bd-pathogen dynamics. To provide a temporal context by which present day dynamics may be better understood, we use a Bd qPCR assay to test 1165 amphibian specimens collected between 1900 and 2005. Our historical analyses reveal a pattern of pathogen invasion and eventual spread across the Sierra Nevada over the last century. Although we found a small number of Bd-infections prior to 1970, these showed no sign of spread or increase in infection prevalence over multiple decades. After the late 1970s, when mass die offs were first noted, our data show Bd as much more prevalent and more spatially spread out, suggesting epizootic spread. However, across the ~400km2 area, we found no evidence of a wave-like pattern, but instead discovered multiple, nearly-simultaneous invasions within regions. We found that Bd invaded and spread in the central Sierra Nevada (Yosemite National Park area) about four decades before it invaded and spread in the southern Sierra Nevada (Sequoia and Kings Canyon National Parks area), and suggest that the temporal pattern of pathogen invasion may help explain divergent contemporary host pathogen dynamics.
Klíčová slova:
Biology and life sciences – Organisms – Eukaryota – Research and analysis methods – Evolutionary biology – Animals – Evolutionary processes – Population biology – Population dynamics – Medicine and health sciences – Pathology and laboratory medicine – Pathogens – Vertebrates – Zoology – Ecology and environmental sciences – Research facilities – Amphibians – Frogs – Conservation science – Conservation biology – Animal diseases – Species colonization – Invasive species – Epizootics – Species extinction – Museum collections
Zdroje
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