Figure 1.
Global distribution of the amphibian chytrid fungus, Batrachochytrium dendrobatidis (Bd).
Maps downloaded from www.Bd-maps.net (15 August 2012); Bd-positive (red) and Bd-negative (white, blue) sites are shown.
Table 1.
Numbers of amphibian species and families with Batrachochytrium dendrobatidis detections as of January 2011.
Table 2.
Numbers of species with Batrachochytrium dendrobatidis (Bd) detections by amphibian family, and results of randomisation tests (see Materials and Methods section) to determine whether each sampled amphibian family was over- or under-infected, compared to what we would expect by chance given an overall prevalence of 508/1055 species.
Figure 2.
Global locations with enigmatic amphibian declines were positively associated with amphibian species richness (data from GAA [7]), and this relationship increased with the occurrence of the amphibian chytrid fungus, Batrachochytrium dendrobatidis, as modeled with logistic regression.
Dashed lines indicate 95% confidence interval.
Figure 3.
Odds of Batrachochytrium dendrobatidis (Bd) detection in amphibians derived from a regression model using data from Bd-maps.net from all species combined (data snapshot July 2010; N = 3,733 locations).
Figure 4.
Extrapolated global maps of the odds of Batrachochytrium dendrobatidis (Bd) detection in amphibians derived from regression models.
The global model using data from all species combined is shown (A), as well as subsets of the world data for species within the amphibian families Bufonidae (B), Hylidae (C), and Ranidae (D). Although these map projections depict the odds of Bd detection at the world scale, it should be noted that amphibians do not occur everywhere in the world, and in particular, the three amphibian families (B,C,D) are not native to all regions world-wide. Significant model parameters differed among models and included landscape-scale site attributes including climate metrics and biotic factors, such as biome or amphibian species richness (see text). Gaps in the mapped models are due to a lack of species richness data, or amphibian absence, for certain regions.
Table 3.
Significant parameters in the regression model using Batrachochytrium dendrobatidis (Bd) occurrence and data from wild-occurring amphibians having precise locations in the global Bd database (N = 3,733 locations).