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Delayed phenology and reduced fitness associated with climate change in a wild hibernator
- J. Lane, L. Kruuk, A. Charmantier, J. Murie, F. S. Dobson
- Environmental ScienceNature
- 27 September 2012
The results show that plastic responses to climate change may be driven by climatic trends other than increasing temperature, and may be associated with declines in individual fitness and, hence, population viability.
Plasma DHEA levels in wild, territorial red squirrels: seasonal variation and effect of ACTH.
The functional response of a hoarding seed predator to mast seeding.
Overall, more cones escaped squirrel cone-hoarding during a mast event than when cone production was low in non-mast years, which supports the predator satiation hypothesis, however, the highly variable seed escape in non -mast years may help to explain why all spruce cone production is not concentrated into fewer, larger, mast years.
Thermal energetics of female big brown bats (Eptesicus fuscus)
Big brown bats had a lower Tlc and lower thermal conductance at low Ta rela- tive to those measured in the previous study, and data combined with data for other vespertilionids suggest that the family may be characterized by a lower BMR than that predicted based on data from other groups of bats.
Sexually selected behaviour: red squirrel males search for reproductive success.
The spatial dispersion of females, resulting from the strict territorial social structure of red squirrels, gave rise to a predicted scramble competition mating system that equalled previous estimates for morphological traits in female defence mating systems.
Climate change and mammals: evolutionary versus plastic responses
Accounts of recent phenotypic changes in wild mammal populations are reviewed with the purpose of critically evaluating whether climate change has been identified as the causal mechanism producing the observed change; whether the change is adaptive; and the relative influences of evolution and/or phenotypesic plasticity underlying the change.
Energetic costs of male reproduction in a scramble competition mating system.
- J. Lane, S. Boutin, J. Speakman, M. Humphries
- Biology, Environmental ScienceThe Journal of animal ecology
The results provide compelling evidence that the energy available for reproductive allocation places a strong limitation on reproduction in male North American red squirrels and contribute to previous work suggesting that high and limiting energetic costs of male reproduction may be a general feature of mammalian reproduction.
Conservation through the lens of (mal)adaptation: Concepts and meta‐analysis
A meta‐analysis of a small number of available studies is used to evaluate whether the different conservation strategies employed are better suited toward increasing population fitness across multiple generations, and finds weakly increasing adaptation over time for transgenerational plasticity, genetic rescue, and evolutionary rescue.
Female multiple mating and paternity in free-ranging North American red squirrels
A quantitative genetic analysis of hibernation emergence date in a wild population of Columbian ground squirrels
- J. Lane, L. Kruuk, F. S. Dobson
- Biology, Environmental ScienceJournal of evolutionary biology
- 1 September 2011
The results provide the first insight into the quantitative genetic influences on the timing of hibernation emergence in a wild population of Columbian ground squirrels and help contribute to a more general understanding of its evolutionary significance.