Dendroboard - View Single Post - What Drives Chytrid Infections in Newt Populations?
Dendroboard

Go Back   Dendroboard
Register Blogs FAQ Calendar Mark Forums Read Advertise

Support Our Sponsors
No Threads to Display.

facebook

View Single Post
  #1 (permalink)  
Old 12-03-2010, 12:10 PM
feeds feeds is offline
Guest
 
Join Date: Sep 2008
Posts: 3,098
Thanks: 0
Thanked 11 Times in 11 Posts
Default What Drives Chytrid Infections in Newt Populations?

The pathogenic chytrid fungus Batrachochytrium dendrobatidis (Bd) is considered responsible for the population declines and extinctions of hundreds of amphibian species worldwide. The panzootic was likely triggered by human-assisted spread, but once the pathogen becomes established in a given region, its distribution is probably determined by local drivers. To assess the relative importance of potential drivers of infection in red-spotted newts (Notophthalmus viridescens), we measured Bd levels in 16 populations throughout central Pennsylvania. Infected individuals were detected in all but four populations, indicating that Bd is widespread in this region. We quantified local factors hypothesized to influence Bd, and found that infection levels were best predicted by the proportion of the pond substrate consisting of leaf litter or vegetation, along with a significant effect of water temperature. Bd infection in amphibians is temperature-dependent, and one possible explanation of the apparent substrate effect is that tree cover and vegetation provide shade, reducing the availability of shallow, warm-water patches in which newts might reduce or clear Bd infections. Alternatively, leaf litter and emergent vegetation might increase Bd infection more directly, perhaps by providing substrates for environmental growth of the fungus. We also observed a curvilinear relationship between Bd load and snout-vent length (a proxy for age), hinting that newts might develop acquired resistance to Bd infection. Though correlational, these results add to a growing body of evidence suggesting that environmental temperature is an important driver of Bd infection dynamics.

What Drives Chytrid Infections in Newt Populations? Associations with Substrate, Temperature, and Shade. Ecohealth. Dec 2 2010






More...
Reply With Quote
 
Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 11:56 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.