Record of a sixteen-year-old white-tailed deer (odocoileus virginanus) in carbondale, Illinois: a brief note.
Herein, we report finding the remains of an old-aged female white-tailed deer from an unharvested population within the city limits of Carbondale, Illinois, <1 km north of Southern Illinois University Carbondale (SIUC) property. This deer was found by researchers during May 2004 while searching for fawns as part of another study (Rohm et al., 2007, 2008). Mortality of this individual had likely occurred during the winter months (but not earlier) given the stage of decomposition. No broken long bones indicative of trauma were noted, nor was hunting legal within city limits, thus, we concluded the animal likely died of natural causes (i.e., senescence). This deer was wearing a radiocollar (frequency 151.744 MHz) from a previous study (Cornicelli, 1992; Cornicelli et al., 1996), thus we knew the animal was captured as an adult in 1991. Remarkably, the mortality location of this individual was still within its home range as calculated by Cornicelli (1992). We collected the lower jaw from this animal and excised an incisor for analysis of cementum annuli (Gilbert, 1966). We counted cementum annuli using a microscope and concluded this animal was 16 years old, making its birth year 1988.
Old-aged deer such as this individual have important implications to population dynamics and vegetation use of deer in developed landscapes, especially if several individuals in the population are able to achieve this age. Older females will contribute fawns to the population over a longer temporal period. Although we did not study fawn recruitment rates during the entire interval this animal was alive, recruitment was estimated at 0.57 fawns/adult doe on SIUC campus during 2007 (Hubbard and Nielsen, 2011). Therefore, this animal may have produced up to 9 recruits during her lifetime, depending on how many years she was reproductively active and given that recruitment rates were similar to the 2007 estimate during 1988-2004. These simple speculations outline the importance of knowing the age-structure of deer populations, as well as adult survival and fawn recruitment rates (Woolf and Harder, 1979).
This individual apparently used a similar home range for the 15 years between her home range calculation by Cornicelli (1992) and when the deer was found dead. Lesage et al. (2000) found that deer in high-density populations coincident with suburban areas were more philopatric than those in low-density populations. Kilpatrick et al. (2001) and McNulty et al. (1997) also reported that female deer demonstrated high philopatry to home ranges even as population abundance in both areas was reduced considerably. The implications of philopatry for long-lived deer include potentially severe herbivory impacts to forage resources in a relatively small area given the long-term presence of individual deer.
We acknowledge M. Doran of the Histology Department at Southern Illinois University Carbondale for sectioning and staining teeth. General support was provided by the Cooperative Wildlife Research Laboratory and Graduate School at Southern Illinois University Carbondale.
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Clayton K. Nielsen, Jennifer L. Swan, and Eric M. Schauber
Cooperative Wildlife Research Laboratory Departments of Forestry and Zoology Southern Illinois University, Carbondale, IL 62901-6504
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|Author:||Nielsen, Clayton K.; Swan, Jennifer L.; Schauber, Eric M.|
|Publication:||Transactions of the Illinois State Academy of Science|
|Date:||Jul 1, 2011|
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