Education
and Professional Experience:
Ph.D.
Kansas State
University Expected 2009
Dissertation:
Interactions
between grassland birds and their snake
predators: the
potential for conservation benefits or conflicts in the
tallgrass prairie
Degrees:
MS Biology
University
of Nebraska at Omaha 2005
Thesis: The effects of local grassland habitat and surrounding
landscape composition on the predators of grassland birds
BS Environmental Science and Policy
Drake
University 2001
Certificates:
Graduate Certificate in Applied Statistics
Kansas State University
2007
Dissertation
Research Overview:
Landscape
modification is a major threat to global biodiversity. Many landscapes
do not
suffer wholesale habitat destruction but exhibit habitat degradation
through
human management. The Flint Hills of Kansas represent the largest tract of
remaining tallgrass
prairie, but despite its immense conservation importance, the region is
managed
for cattle production with intensive fire and grazing.
The Flint Hills appear contiguous but may be functionally fragmented
for
its native fauna (cryptic fragmentation). Interactions between the
native predator
and prey may be altered by their differential perception of habitat
abundance or
connectivity. For example, nest predation in birds often increases in
edge habitats
where nests are subject to high densities of predators residing in or
entering
the patch during foraging. With cryptic fragmentation, the
inability to
define edge habitat a priori
requires
a species-based approach to model the
functional
connectivity for the predator and its impact on prey.
I am modeling the
landscape to elucidate cryptic fragmentation as
perceived by both the predator and the prey. Predation risk is modeled
by
overlapping the distribution of suitable predator habitat (snakes) and
suitable
prey habitat (birds). The response of nest predators to landscape
heterogeneity
may increase incidental encounters with bird nests through increased
predator
densities or increased foraging efficiency. Snakes do not rely solely
on bird
nests as prey so the density of snake predators is independent of bird
nest
density. Still, land management may enhance predator-prey interactions
through
habitat modifications that force birds to nest in areas that are highly
saturated
with predators creating ecological traps for birds. The modeling
approach gives a spatially-explicit map of suitable snake habitat, but
it does
not identify how snake populations respond and scale to the
heterogeneity. The
use of spatial and genetic data will reveal how landscape heterogeneity
influences the distribution and gene flow in a predatory snake.
Landscape
genetics will elucidate landscape connectivity and identify
environmental
features that impede or facilitate snake movement to influence
foraging. If
snakes perceive a less fragmented landscape and also overlap in habitat
with
birds, high densities of snakes can move with less restraint across the
landscape to exhibit top-down controls on birds and negatively impact
nesting. Landscape
genetics will reveal population-level responses of snakes to bridge the
gap
between fine scale understandings of snakes at the individual level to
a
population level commensurate with bird studies.