Abstract:
Understanding the threats to wildlife across space and time is essential for developing effective
conservation strategies. In Mesoamerica (i.e., the region that extends from Central Mexico to the
most southern point in Panama) at least 40% of amphibian species declined between the late
1970s and the early 2000s. Most of these declines have been linked with the destruction of
suitable habitats for amphibians as well as the introduction and spread of the fungal pathogen
Batrachochytrium dendrobatidis, the causal agent of the disease known as chytridiomycosis. In this
study, we quantified geographic and elevational ranges for direct-developing, stream-dwelling
frog species (DSFS) in Mesoamerica. Within the range of each DSFS, we estimated the extent of
suitable area for the occurrence of Batrachochytrium dendrobatidis and the types of land use to
quantify habitat deterioration. To date, 33% of DSFS remain undetected since 2005 or before. At
the regional level (i.e., Mesoamerica), as in previous studies, we found that narrow geographic
and elevational ranges increased vulnerability to extinction. Nevertheless, the ranges of 83% of
DSFS were composed of 50% or more high-quality habitats between the 1980s and 2005, when
most species declined. We also found that on average, 80% of the range of each species currently
overlaps with predicted suitable areas for the occurrence of Batrachochytrium dendrobatidis. At the
local and site level (i.e., focusing on two species ranges where extensive monitoring has been
conducted even before decline occurred), we found that the present suitable habitat for Batrachochytrium
dendrobatidis corresponded with the reduction in predicted habitat suitability and
climatic niche of DSFS. We also found that the location of remnant populations can be predicted
by environmental factors, which can help identify regions where remnant populations of these
declined species and others with similar ecology may occur. Combined, results from our regional
and local analyses support the idea that Batrachochytrium dendrobatidis was the main driver of
DSFS declines and of the current lack of recent observations of fifteen DSFS. We used our results
to propose specific actions for all DSFS included in this study. This study highlights the importance
of considering multiple threats and spatial scales when assessing the status of declined and
threatened species
