Reproduction in moose at their southern range limit

Journal of Mammalogy
By: , and 

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Abstract

Reproduction is a critical fitness component in large herbivores. Biogeographic models predict that populations occurring at the edges of the range may have compromised reproductive rates because of inferior habitat at range peripheries. When reproductive rates are chronically low, ungulate populations may lack the resiliency to rebound quickly after periods of environmental stress, and this effect may be greatest for heat-sensitive organisms at their southern range limit. To assess the demographic vulnerability of moose ( Alces alces ), we studied relationships between reproductive rates, maternal age, and rump fat in the southernmost naturally occurring moose population in North America. For prime-aged moose in our study, pregnancy rates were high (92%), but moose aged < 3 or > 9 years had low pregnancy rates (32% and 38%, respectively). The relationship between rump fat and pregnancy was nonlinear such that a threshold of at least 2mm of rump fat yielded a high probability of being pregnant midwinter. In contrast, among pregnant moose, the probability of both producing a calf and recruiting it until spring increased linearly with rump fat. We also conducted a meta-analysis of pregnancy and twinning rates for adult (≥ 2 years) moose across a latitudinal gradient to compare reproductive rates from our study to other populations in North America. Moose living at southern latitudes tended to have lower reproductive rates than those living in the core of moose range, implying that southern moose populations may be demographically more vulnerable than northern moose populations.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Reproduction in moose at their southern range limit
Series title Journal of Mammalogy
DOI 10.1093/jmammal/gyw099
Volume 97
Issue 5
Year Published 2016
Language English
Publisher Oxford Academic
Contributing office(s) Coop Res Unit Seattle
Description 11 p.
First page 1355
Last page 1365
Country United States
State Utah
Other Geospatial Uinta Mountions, Wasatch Mountains