Jon T. Jorgenson

Genetic decline, restoration and rescue of an isolated ungulate population

Marc‐Antoine Poirier, David W. Coltman, Fanie Pelletier, Jon T. Jorgenson et autres

Abstract Isolation of small populations is expected to reduce fitness through inbreeding and loss of genetic variation, impeding population growth and compromising population persistence. Species with long generation time are the least likely to be rescued by evolution alone. Management interventions that …

ca (code pays fourni par la source)

Data from: Genetic decline, restoration and rescue of an isolated ungulate population

Marc‐Antoine Poirier, David W. Coltman, Fanie Pelletier, Jon T. Jorgenson et autres

Isolation of small populations is expected to reduce fitness through inbreeding and loss of genetic variation, impeding population growth and compromising population persistence. Species with long generation time are the least likely to be rescued by evolution alone. Management interventions that maintain …

ca (code pays fourni par la source)

Can phenotypic rescue from harvest refuges buffer wild sheep from selective hunting?

Fanie Pelletier, Marco Festa‐Bianchet, Jon T. Jorgenson, Chiarastella Feder et autres

Human harvests can unwittingly drive evolution on morphology and life history, and these selective effects may be detrimental to the management of natural resources. Although theory suggests that harvest refuges, as sources of unselected animals, could buffer the effects of human exploitation …

ca (code pays fourni par la source)

Decrease in horn size and increase in age of trophy sheep in Alberta over 37 years

Marco Festa‐Bianchet, Fanie Pelletier, Jon T. Jorgenson, Chiarastella Feder et autres

ABSTRACT Long‐term data (1974–2011) from harvested bighorn rams (Ovis canadensis) in Alberta, Canada, suggested a reduction in horn size and in the proportion of trophy rams in the provincial population over time. Age at harvest increased over time, suggesting slower horn growth. …

ca (code pays fourni par la source)

Data from selective harvests underestimate temporal trends in quantitative traits

Fanie Pelletier, Marco Festa‐Bianchet, Jon T. Jorgenson

Human harvests can select against phenotypes favoured by natural selection, and natural resource managers should evaluate possible artificial selection on wild populations. Because the required genetic data are extremely difficult to gather, however, managers typically rely on harvested animals to document temporal …

ca (code pays fourni par la source)

quantitative traits Data from selective harvests underestimate temporal trends in

Fanie Pelletier, Marco Festa‐Bianchet, Jon T. Jorgenson

Human harvests can select against pheno-types favoured by natural selection, and naturalresource managers should evaluate possible arti-ficial selection on wild populations. Because therequired genetic data are extremely difficult togather, however, managers typically rely on har-vested animals to document temporal trends.It is usually …

Never too late? Consequences of late birthdate for mass and survival of bighorn lambs

Chiarastella Feder, Julien G. A. Martin, Marco Festa‐Bianchet, Céline H. Bérubé et autres

ca (code pays fourni par la source)

Does ecosystem size determine aquatic bacteria richness? Reply

Isabel Reche, J.C. Meyran, Antoine Lecerf, Graham E. Forrester et autres

With the advent of DNA-based molecular technologies, microbial ecologists now have the tools to test whether general ecological patterns apply to microorganisms. In this study, we selected 11 high-mountain lakes from Sierra Nevada (Spain) to test the predictions of island-biogeography theory in …

fr (code pays fourni par la source)

Maternal condition and offspring sex ratio in polygynous ungulates: a case study of bighorn sheep.

Pierrick Blanchard, Marco Festa‐Bianchet, Jean‐Michel Gaillard, Jon T. Jorgenson

fr (code pays fourni par la source)

Maternal condition and offspring sex ratio in polygynous ungulates: a case study of bighorn sheep

Pierrick Blanchard, Marco Festa‐Bianchet, Jean‐Michel Gaillard, Jon T. Jorgenson

The Trivers and Willard model (TWM) predicts that for sexually dimorphic polygynous mammals, mothers able to provide a high level of care should bias offspring sex ratio in favor of sons. Contradictory results of empirical studies, however, suggest that selective pressures for …

fr (code pays fourni par la source)

Undesirable evolutionary consequences of trophy hunting

David W. Coltman, P. N. O'Donoghue, Jon T. Jorgenson, John T. Hogg et autres

gb, ca (code pays fourni par la source)

A Test of Long-Term Fecal Nitrogen Monitoring to Evaluate Nutritional Status in Bighorn Sheep

Pierrick Blanchard, Marco Festa‐Bianchet, Jean‐Michel Gaillard, Jon T. Jorgenson

Pierrick Blanchard, Marco Festa-Bianchet, Jean-Michel Gaillard, Jon T. Jorgenson, A Test of Long-Term Fecal Nitrogen Monitoring to Evaluate Nutritional Status in Bighorn Sheep, The Journal of Wildlife Management, Vol. 67, No. 3 (Jul., 2003), pp. 477-484

fr (code pays fourni par la source)