sculptor said:
↑
I suspect that it is insecticides and herbicides which are the root cause of . . . . the weakened bat populations.
No. The cause has been clearly identified as white nose syndrome, a fungus that grows on the muzzles and wings of hibernating bats. ... .
Perhaps
Perhaps not?
excerpts from this article:
http://www.birc.org/JunJul2013.pdf
White nose fungus has many elements
in common with the fungus
Batrachochytrium dendrobatidis,
which has caused massive die-offs
in amphibian populations (Eskew
and Todd 2013). Pesticide contamination
has been proposed as a contributing
factor in both diseases
(Shah 2010).
...
European bats may
have evolved resistance to the
pathogen, and probably have
immune system protection. The
immune system of U.S. bats is
unable to prevent infection and
death, either because acquired
immunity to the novel pathogen is
slow to develop, or because the
immune systems of U.S. bats are
generally compromised
...
A number of things could lead to
immune suppression. Improper
nutrition could have an effect. Bats
are voracious foragers, eating close
to their weight in insects every day.
If their food supply is reduced, due
either to pesticides or weather conditions,
improper nutrition might
lead to a depressed immune system
(Barclay and Dolan 1991; Kannan
et al. 2010; Burles et al. 2008).
.....
Bat immune systems may be
depressed from environmental contamination
or pesticide residues.
Little brown bats can live for 34
years, and often eat their body
weight of insects every day (BrunetRossini
and Wilkinson 2009). With
this kind of metabolic flow, they are
vulnerable to accumulation of pesticides
and environmental contaminants,
We ain't nowhere near a bottom line on this, and the science definitely ain't "settled".