Scatterhoarding rodents favor higher predation risks for cache sites: The potential for predators to influence the seed dispersal process

Integrative Zoology - Tập 10 Số 3 - Trang 257-266 - 2015
Michael A. Steele1, Ghislain Rompré1,2, Jeffrey A. Stratford1, Hongmao Zhang1,3, Matthew Suchocki1, Shealyn Marino1
1Department of Biology, Wilkes University, Wilkes-Barre, PA, USA
2The Scotts Company Marysville OH USA
3School of Life Science Central China Normal University Wuhan China

Tóm tắt

AbstractScatterhoarding rodents often place caches in the open where pilferage rates are reduced, suggesting that they tradeoff higher risks of predation for more secure cache sites. We tested this hypothesis in two study systems by measuring predation risks inferred from measures of giving‐up densities (GUDs) at known cache sites and other sites for comparison. Rodent GUDs were measured with small trays containing 3 L of fine sand mixed with sunflower seeds. In the first experiment, we relied on a 2‐year seed dispersal study in a natural forest to identify caches of eastern gray squirrels (Sciurus carolinensis) and then measured GUDs at: (i) these caches; (ii) comparable points along logs and rocks where rodent activity was assumed highest; and (iii) a set of random points. We found that GUDs and, presumably, predation risks, were higher at both cache and random points than those with cover. At the second site, we measured GUDs of eastern gray squirrels in an open park system and found that GUDs were consistently lowest at the base of the tree compared to more open sites, where previous studies show caching by squirrels to be highest and pilferage rates by naïve competitors to be lowest. These results confirm that predation risks can influence scatterhoarding decisions but that they are also highly context dependent, and that the landscape of fear, now so well documented in the literature, could potentially shape the temporal and spatial patterns of seedling establishment and forest regeneration in systems where scatterhoarding is common.

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Tài liệu tham khảo

10.1139/z2012-036

10.2307/2269597

10.1098/rstb.2006.1812

10.1098/rstb.2009.0217

10.1007/BF00395696

Brown JS, 1999, Vigilance, patch use and habitat selection: Foraging under predation risk, Evolutionary Ecology Research, 1, 49

10.1111/j.1461-0248.2004.00661.x

Burnham KP, 2002, Model Selection and Multimodel Inference

10.1111/j.1600-0706.2011.19278.x

10.1016/j.anbehav.2009.08.015

10.1006/anbe.1996.0242

10.1111/ele.12000

10.1139/z87-194

10.1016/j.foreco.2006.02.010

10.1079/9780851995250.0209

10.1890/03-4042

10.1073/pnas.1205184109

10.1890/03-3002

10.1890/13-1083.1

10.2307/1313225

10.1139/z90-092

Lichti NI, 2012, Implications of context‐dependent scatterhoarding for seed survival and dispersal in North American oaks (Quercus)

10.1890/13-1657.1

10.1016/j.anbehav.2006.06.017

10.1007/978-1-4899-3242-6

10.1890/07-0247.1

10.1111/j.1365-2745.2011.01818.x

10.1093/beheco/arh031

10.1016/j.anbehav.2011.07.001

10.1111/j.0030-1299.2008.16370.x

10.1037/0735-7036.119.2.187

10.2307/1938541

10.2307/1380886

Steele M, 2002, Oak Forest Ecosystems: Ecology and Management for Wildlife, 182

10.1016/j.actao.2011.05.002

10.1093/beheco/art107

10.1079/9780851998060.0283

10.1644/08-MAMM-A-035.1

10.1080/15659801.2014.907974

Van der Merwe M, 2007, Foraging ecology of North American tree squirrels on cacheable and less cacheable foods: A comparison of two urban habitats, Evolutionary Ecology Research, 9, 705

Vander Wall SB, 1990, Food Hoarding in Animals

10.1098/rstb.2009.0205

10.1007/s00265-006-0172-6

10.1016/S0169-5347(02)02541-7

10.1111/1365-2745.12113

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Integrative Zoology

Tập 10 Số 3

257-266

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