Habitat Use of the Snowshoe Hare Melissa Pacheco Winter Ecology Spring 2010 Mountain Research...
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Transcript of Habitat Use of the Snowshoe Hare Melissa Pacheco Winter Ecology Spring 2010 Mountain Research...
Habitat Use of the Snowshoe Hare
Melissa PachecoWinter Ecology
Spring 2010
Mountain Research Station, University of Colorado, Boulder
Introduction
How does the snowshoe hare (lepus americanus) allocate time between different habitats?How does the spatial structure of the forest
affect the habitat use of the snowshoe hare?
IntroductionSpecifically between two environments
Semi-closed lodge pole pine forest
Semi-open aspen and willow grove
Introduction
Literature suggests:• Hare avoid open areas due to predation risks(Orr, 1982)
• Shrubs are not an important component of cover (Malaney, 2006)
• Variety of vegetative features are important (Monzón, 2004)
• In Utah, lodgepole pine habitats were used much more extensively then aspen habitats (Dolbeer,, 1975)
Hypothesis: There will be more evidence of snowshoe hare activity in the semi-closed
environment.
Introduction
• Relevance to ecology:– Snowshoe hare are essential to
ecosystems that they live in • Predators include: foxes,
coyotes, wolves, lynx, bobcats, mink, weasels, owls, mountain lions, hawks, & wolverine (Shefferly, 2007)
– considered a keystone species (Kurta, 1995) depending on ecosystem
– Gain knowledge of the ecology of important species
Methods
• Randomly selected study area with semi-open habitat bordered by semi-closed environment
• Stretched 100m field tape along border• Random number generator picked 4 values
– 9,26,71,91
• Walked either side of field tape for 10m at corresponding distances
• Recorded presence of hare tracks and depth into each environment
Methods
Semi-open Habitat
Semi-closed Habitat
– 100m field tape– 10m transect into each
microhabitat– Stream
Semi-closed Habitat Semi-open Habitat
Methods
Limitations of study design• Data collect required good weather/
snow conditions• Depth into habitat had no meaning• Study area included stream
Data
Transect Semi-closed
(m)
Semi-open (m)
1 3.5 5.4
2 6.2, 6.4 TNP
3 9.3 2.3, 8.5
4 TNP 0.8, 2.5
TNP- tracks not present
Data
Semi-open Habitat
Semi-closed Habitat
– 100m field tape– 10m transect into each
microhabitat– Stream Observed Tracks
Data
Semi-open Semi-closed
Total # Tracks
Present
4 5
Semi-open Semi-closed
Frequency .75 .75
Abundance
Frequency
Results
Results
• Difference in abundance is not significant
• Frequencies between habitats were equal
Discussion
• Frequency suggests similar distribution between habitats
• Fail to reject null hypothesis
• Both habitats are likely to contain important features
• Type of predator may influence cover required
• Complimentary habitats being used in same way
Discussion
• Spatial structure not only factor differentiating habitats
• May have found different effect in other mountain winter ecosystems
• Possible sources of error– Not enough data, need replicates– Can not tell if tracks came from same
individual or from separate SSH
Conclusion
• Frequency suggests similar distribution between habitats
• Both habitats likely include important features for snowshoe hare ecology
• Complementary habitats
Special ThanksMy Mother
&Justin D’Atri
Questions?
Literature CitedDolebeer, R. A., C. R. Willam. “Population Ecology of Snowshoe Hares
in the Central Rocky Mountains” The Journal of Wildlife Management, Vol. 39, No. 3 (Jul., 1975) pp. 535-549
Kurta, A. 1995. Mammals of the Great Lakes Region. Ann Arbor: University of Michigan Press.
Malaney, J. L., J. K. Frey. “Summer Habitat Use by Snowshoehare and Cottontail at Their Southern Zone of Sympatry” The Journal of Wildlife Management, Vol. 70, No. 3 (Jun., 2006), pp. 877-883
Monzón, A., P. Fernandes, and N. Rodrigues. "Vegetation structure descriptors regulating the presence of wild rabbit in the National Park of Peneda-Gerês, Portugal." European Journal of Wildlife Research 50.1 (2004): 1-6. Print.
Orr, C., D. G. Dodds. “Snowshoe Hare Habitat Preferences in Nova Scotia Spruce-Fir Forests” Wildlife Society Bulletin, Vol. 10, No. 2 (Summer, 1982), pp. 147-150
Shefferly, N. 2007. "Lepus americanus" (On-line), Animal Diversity Web. Accessed February 06, 2010 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Lepus_americanus.html.