White‐Tailed Deer, Weather and Predation: a New Understanding of Winter Severity for Predicting Deer Mortality

2021 ◽  
Author(s):  
Andrew S. Norton ◽  
Daniel J. Storm ◽  
Timothy R. Van Deelen
Keyword(s):  
Winter Severity

The Effect of Age, Sex and Winter Severity on Return Rates and Apparent Survival in the Common Kingfisher Alcedo atthis

Ardea ◽  
2021 ◽  
Vol 109 (1) ◽  
Author(s):  
Lucia Rubáčová ◽  
Pavel Čech ◽  
Mária Melišková ◽  
Martin Čech ◽  
Petr Procházka
Keyword(s):  
Apparent Survival ◽  
Return Rates ◽  
The Common ◽  
Effect Of Age ◽  
Winter Severity

Ice Bridges on the St. Lawrence River as an Index of Winter Severity from 1620 to 1910

2007 ◽  
Vol 20 (4) ◽  
pp. 757-764 ◽  
Author(s):  
Daniel Houle ◽  
Jean-David Moore ◽  
Jean Provencher
Keyword(s):  
Positive Impact ◽  
Volcanic Eruptions ◽  
Temperature Reconstruction ◽  
Winter Temperature ◽  
Climate Forcing ◽  
Quebec City ◽  
Temperature Index ◽  
Saint Lawrence River ◽  
St Lawrence River ◽  
Winter Severity

Abstract Temperature reconstruction of the last thousand years suggests that an unprecedented warming (+0.6°C) occurred over the globe in the last century. However, regional variations in climate are not resolved by Northern Hemisphere reconstructions. In northeastern North America, past climate and, particularly, past winter variations are poorly known. Here, the authors report on the variation of a winter temperature index during the 1620–1910 period, based on the ice bridge formation (IBF) rate on the Saint Lawrence River at Québec City (Canada), combined with instrumental data (1876–2000). During this 300-yr period, the IBF rate shows that winters in the seventeenth and eighteenth centuries were warmer than those in the nineteenth century. In particular, the IBF rate suggests that winter severity culminated in the 1850–1900 period, while very few ice bridges were reported between 1620 and 1740, presumably because of warmer temperatures and the relative scarcity of historical documents for the 1680–1740 period. These data suggest that winter temperature, particularly between ∼1800 and 1910, was 2.4° to 4.0°C colder than the last 30-yr average. Major volcanic eruptions had a significant positive impact on IBF rates, which is consistent with their role as important climate-forcing events.

scholarly journals Tawny OwlStrix alucoas an indicator of Barn OwlTyto albabreeding biology and the effect of winter severity on Barn Owl reproduction

Ibis ◽  
2014 ◽  
Vol 156 (2) ◽  
pp. 433-441 ◽  
Author(s):  
Alexandre Chausson ◽  
Isabelle Henry ◽  
Bertrand Ducret ◽  
Bettina Almasi ◽  
Alexandre Roulin
Keyword(s):  
Barn Owl ◽  
Winter Severity

Population decline in semi-migratory caribou (Rangifer tarandus): intrinsic or extrinsic drivers?

2013 ◽  
Vol 91 (11) ◽  
pp. 820-828 ◽  
Author(s):  
Guillaume Bastille-Rousseau ◽  
James A. Schaefer ◽  
Shane P. Mahoney ◽  
Dennis L. Murray
Keyword(s):  
Density Dependence ◽  
Rangifer Tarandus ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Population Decline ◽  
Negative Relationship ◽  
Population Limitation ◽  
Continental Scale ◽  
Delayed Density Dependence ◽  
Winter Severity

Many populations of caribou (Rangifer tarandus (L., 1758)) across North America, including Newfoundland, are in a state of decline. This phenomenon may reflect continental-scale changes in either the extrinsic or the intrinsic factors affecting caribou abundance. We hypothesized that caribou decline reflected marked resource limitation and predicted that fluctuations should correspond to time-delayed density dependence associated with a decline in range quality and decadal trends in winter severity. By conducting time-series analysis using 12 populations and evaluating correlations between caribou abundance and trends in (i) vegetation available at calving (normalized difference vegetation index, NDVI), (ii) winter weather severity (index of North Atlantic Oscillation, NAO), and (iii) caribou morphometrics, we observed strong evidence of density dependence in population dynamics (i.e., a negative relationship between caribou population size and caribou morphometrics). Caribou population trajectories were time-delayed relative to winter severity, but not relative to calving-ground greenness. These island-wide correlations could not be traced to dispersal between herds, which appears rare at least for adult females. Our results suggest that trends in winter severity may synchronize broad-scale changes in caribou abundance that are driven by time-delayed density dependence, although it remains possible that calving-ground deterioration also may contribute to population limitation in Newfoundland. Our findings provide the basis for additional research into density dependence and caribou population decline.

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