Impacts of climate warming on terrestrial ectotherms across latitude
- C. Deutsch, J. Tewksbury, P. Martin
- Environmental ScienceProceedings of the National Academy of Sciences
- 6 May 2008
The results show that warming in the tropics, although relatively small in magnitude, is likely to have the most deleterious consequences because tropical insects are relatively sensitive to temperature change and are currently living very close to their optimal temperature, so that warming may even enhance their fitness.
Do baseline glucocorticoids predict fitness?
Are mountain passes higher in the tropics? Janzen's hypothesis revisited.
- C. Ghalambor, R. Huey, P. Martin, J. Tewksbury, George Wang
- Environmental ScienceIntegrative and Comparative Biology
- 6 January 2006
General support for many assumptions and predictions are found, but several issues are called attention that somewhat ameliorate the generality of Janzen's classic hypothesis.
The relationship between fitness and baseline glucocorticoids in a passerine bird.
Maternal corticosteroids influence primary offspring sex ratio in a free-ranging passerine bird
These findings provide the first evidence of a natural correlation between maternal corticosteroids and offspring sex ratios in free-ranging birds, and the first experimental Evidence of a causal link between moderate increases in cortic Fosteroids and biased primary sex ratios.
Urban birds have broader environmental tolerance
The results suggest that broad environmental tolerance may predispose some birds to thrive in urban habitats, and the mechanisms mediating such environmental tolerance warrant further investigation.
Variation in the Structure of Bird Nests between Northern Manitoba and Southeastern Ontario
While changes in nest composition vary uniquely for each species, the pattern of larger nests in northern Manitoba compared to southeastern Ontario in three of three phylogenetically-independent comparisons suggests that birds are adapting to similar selective pressures between locations.
Sex-specific consequences of life in the city
- F. Bonier, P. Martin, Kimberly S. Sheldon, Jay P. Jensen, Sarah L. Foltz, J. Wingfield
- Biology, Environmental Science
Tests of 3 hypotheses relating to cort secretion in urban animals found sex-specific effects, highlighting the importance of considering sex in investigation of physiological responses to disturbance.
HABITAT FRAGMENTATION AND PAIRING SUCCESS IN THE OVENBIRD (SEIURUS AUROCAPILLUS)
It is concluded that habitat fragmentation reduces pairing success by altering dispersal dynamics or habitat selection by females, while it remained stable around 80% in extensive forests of all three studies.
Nest predation and the evolution of nestling begging calls
- J. Briskie, P. Martin, T. E. Martin
- Environmental ScienceProceedings of the Royal Society of London…
- 7 November 1999
The relationship between call structure and the risk of predation supports the hypothesis that attracting predators is a direct cost of begging and that such costs can constrain any evolutionary escalation in the intensity of nestling begging.