[article]
| Titre : |
Dynamics of an emerging disease drive large-scale amphibian population extinctions |
| Type de document : |
Imprimé |
| Auteurs : |
Vance T. Vredenburg ; Roland A. Knapp ; Tate S. Tunstall ; Cheryl J. Briggs (1963-) |
| Année de publication : |
2010 |
| Article en page(s) : |
9689-9694 |
| Langues : |
Anglais (eng) |
| Catégories : |
[CBNPMP-Thématique] Enjeux de conservation des lacs d'altitude
[CBNPMP-Thématique] Amphibiens
|
| Résumé : |
Epidemiological theory generally suggests that pathogens will not cause host extinctions because the pathogen should fade out when the host population is driven below some threshold density. An emerging infectious disease, chytridiomycosis, caused by the fungal pathogen Batrachochytrium dendrobatidis (Bd) is directly linked to the recent extinction or serious decline of hundreds of amphibian species. Despite continued spread of this pathogen into uninfected areas, the dynamics of the host–pathogen interaction remain unknown. We use fine-scale spatiotemporal data to describe (i) the invasion and spread of Bd through three lake basins, each containing multiple populations of the mountain yellow-legged frog, and (ii) the accompanying host–pathogen dynamics. Despite intensive sampling, Bd was not detected on frogs in study basins until just before epidemics began. Following Bd arrival in a basin, the disease spread to neighboring populations at ≈700 m/yr in a wave-like pattern until all populations were infected. Within a population, infection prevalence rapidly reached 100% and infection intensity on individual frogs increased in parallel. Frog mass mortality began only when infection intensity reached a critical threshold and repeatedly led to extinction of populations. Our results indicate that the high growth rate and virulence of Bd allow the near-simultaneous infection and buildup of high infection intensities in all host individuals; subsequent host population crashes therefore occur before Bd is limited by density-dependent factors. Preventing infection intensities in host populations from reaching this threshold could provide an effective strategy to avoid the extinction of susceptible amphibian species in the wild. |
| Lien pérenne : |
DOI : 10.1073/pnas.091411110  |
| Permalink : |
https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=150912 |
in Proceedings of the National Academy of Sciences of the United States of America > 107 (21) (May 2010) . - 9689-9694
Vredenburg, Vance T., Knapp, Roland A., Tunstall, Tate S., Briggs, Cheryl J. (1963-)
2010
Dynamics of an emerging disease drive large-scale amphibian population extinctions.
Proceedings of the National Academy of Sciences of the United States of America, 107(21): 9689-9694.
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Affiner la rechercheDynamics of an emerging disease drive large-scale amphibian population extinctions in Proceedings of the National Academy of Sciences of the United States of America, 107 (21) (May 2010)
