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Young white-tailed deer that disperse survive the same as those that stay home

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IMAGE: This map of wildlife management units in the state of Pennsylvania shows the five areas where deer were captured for this study. Values in parentheses indicate the percentage of forest.
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Credit: Diefenbach Lab, Penn State
Juvenile white-tailed deer that strike out to find new home ranges despite facing more risks survive at about the same rate as those that stay home, according to a team of researchers who conducted the first mortality study of male and female dispersal where deer were exposed to threats such as hunting throughout their entire range.
Dispersal occurs when a juvenile leaves the area where it was born and moves to a new location where the young animal establishes its adult home range, explained Duane Diefenbach, Penn State adjunct professor of wildlife ecology. The instinctual dispersal of young deer from the area where they were born to a new home range protects the species gene pool from inbreeding with c ....

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Levels of stress hormone in saliva of newborn deer fawns may predict mortality

Levels of stress hormone in saliva of newborn deer fawns may predict mortality
The first-ever study of the levels of the stress hormone cortisol in the saliva of newborn white-tailed deer fawns yielded thought-provoking results that have Penn State researchers suggesting predation is not the only thing in the wild killing fawns.
“We think the hormone offers a way to evaluate factors in the environment that affect fawns, such as disease, but are difficult to evaluate when just looking at a carcass that has been picked over by predators,” said researcher Duane Diefenbach, adjunct professor of wildlife ecology. “By then, it’s impossible to be certain what truly caused the fawn’s demise.” ....

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