scholarly journals Association between weather and Dall's sheep Ovis dalli dalli harvest success in Alaska

2020 ◽  
Vol 2020 (2) ◽  
Author(s):  
Scott Leorna ◽  
Todd Brinkman ◽  
Julie McIntyre ◽  
Brad Wendling ◽  
Laura Prugh
Keyword(s):  
Ovis Dalli ◽  
Dall’S Sheep

scholarly journals Using next generation sequencing of alpine plants to improve fecal metabarcoding diet analysis for Dall’s sheep

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Kelly E. Williams ◽  
Damian M. Menning ◽  
Eric J. Wald ◽  
Sandra L. Talbot ◽  
Kumi L. Rattenbury ◽  
...  
Keyword(s):  
Sequence Data ◽  
Vascular Plant ◽  
Alpine Plants ◽  
Diet Analysis ◽  
Reference Sequence ◽  
Reference Library ◽  
Ovis Dalli ◽  
Plant Animal Interactions ◽  
Dall’S Sheep ◽  
Northwestern North America

Abstract Objectives Dall’s sheep (Ovis dalli dalli) are important herbivores in the mountainous ecosystems of northwestern North America, and recent declines in some populations have sparked concern. Our aim was to improve capabilities for fecal metabarcoding diet analysis of Dall’s sheep and other herbivores by contributing new sequence data for arctic and alpine plants. This expanded reference library will provide critical reference sequence data that will facilitate metabarcoding diet analysis of Dall’s sheep and thus improve understanding of plant-animal interactions in a region undergoing rapid climate change. Data description We provide sequences for the chloroplast rbcL gene of 16 arctic-alpine vascular plant species that are known to comprise the diet of Dall’s sheep. These sequences contribute to a growing reference library that can be used in diet studies of arctic herbivores.

Superovulation in Dall's sheep (Ovis dalli dalli)

1990 ◽  
Vol 33 (1) ◽  
pp. 201 ◽  
Author(s):  
B.C. Buckrell ◽  
C.J. Gartley ◽  
K.G. Mehren ◽  
K.L. Goodrowe
Keyword(s):  
Ovis Dalli ◽  
Dall’S Sheep

Critical snow density threshold for Dall’s sheep (Ovis dalli dalli)

2018 ◽  
Vol 96 (10) ◽  
pp. 1170-1177 ◽  
Author(s):  
Kelly J. Sivy ◽  
Anne W. Nolin ◽  
Christopher L. Cosgrove ◽  
Laura R. Prugh
Keyword(s):  
Snow Depth ◽  
Animal Movement ◽  
Population Declines ◽  
Snow Density ◽  
Energetic Costs ◽  
Snow Properties ◽  
Ovis Dalli ◽  
Snow Conditions ◽  
Dall’S Sheep ◽  
Density Threshold

Snow cover can significantly impact animal movement and energetics, yet few studies have investigated the link between physical properties of snow and energetic costs. Quantification of thresholds in snow properties that influence animal movement are needed to help address this knowledge gap. Recent population declines of Dall’s sheep (Ovis dalli dalli Nelson, 1884) could be due in part to changing snow conditions. We examined the effect of snow density, snow depth, and snow hardness on sinking depths of Dall’s sheep tracks encountered in Wrangell–St. Elias National Park and Preserve, Alaska. Snow depth was a poor predictor of sinking depths of sheep tracks (R2 = 0.02, p = 0.38), as was mean weighted hardness (R2 = 0.09, p = 0.07). Across competing models, top layer snow density (0–10 cm) and sheep age class were the best predictors of track sink depths (R2 = 0.58). Track sink depth decreased with increasing snow density, and the snowpack supported the mass of a sheep above a density threshold of 329 ± 18 kg/m3 (mean ± SE). This threshold could aid interpretation of winter movement and energetic costs by animals, thus improving our ability to predict consequences of changing snowpack conditions on wildlife.

Factors controlling lambing period of Dall's sheep

1980 ◽  
Vol 58 (6) ◽  
pp. 1027-1031 ◽  
Author(s):  
Fred L. Bunnell
Keyword(s):  
Body Size ◽  
Ovis Dalli ◽  
Study Population ◽  
Energetic Constraints ◽  
Dall’S Sheep

Distribution of birth dates within the study population of Ovis dalli dalli reveal two distinct oestrous cycles with a further 15% of all births resulting from a third cycle. The onset of breeding appears governed by photoperiod. Lambs born early and late in the lambing period suffer higher mortality. Energetic constraints limit both onset and duration of lambing. Onset is delayed beyond the period critical to thermoregulation by lambs and until forage is adequate; duration is limited by the need of lambs to attain adequate body size by winter.

Relationship between predation-risk factors and sexual segregation in Dall's sheep (Ovis dalli dalli)

2002 ◽  
Vol 80 (12) ◽  
pp. 2108-2117 ◽  
Author(s):  
Paulo Corti ◽  
David M Shackleton
Keyword(s):  
Body Size ◽  
Predation Risk ◽  
Canis Lupus ◽  
Reproductive Strategy ◽  
Sexual Segregation ◽  
Lower Altitude ◽  
Nutritional Components ◽  
Ovis Dalli ◽  
Active Feeding ◽  
Dall’S Sheep

Using a population of Dall's sheep (Ovis dalli dalli), we examined two of the four main sexual-segregation hypotheses proposed: (1) the reproductive-strategy hypothesis, which proposes that males feed in the best foraging areas to enhance their reproductive fitness and females use areas with lower predation risk to raise offspring; and (2) the sexual dimorphism – body size hypothesis, which proposes that females use the areas with best forage to satisfy the nutritional demands of gestation and lactation, and that males, owing to their larger body size, have greater absolute metabolic requirements and therefore have to feed on forages which are more abundant but of lower quality. In our study, males were found farther from cover, in gentle terrain, and at lower altitude than were female groups, which were near cliffs or talus at higher altitudes. Female groups without lambs left cover, but were always active (feeding or moving). Forage density index values were higher in areas used by males than in areas used by female groups. Nutritional components were generally similar, but fibre content was higher in male areas. Signs of wolves (Canis lupus) and predation on Dall's sheep were recorded only at male areas. The results support the reproductive-strategy hypothesis, indicating that predation plays a key role in the development of sexual segregation in Dall's sheep.

scholarly journals FURTHER STUDIES ON HORN ABERRATIONS IN DALL'S SHEEP (OVIS DALLI DALLI) FROM YUKON TERRITORY, CANADA

1984 ◽  
Vol 20 (2) ◽  
pp. 125-133
Author(s):  
Thomas D. Bunch ◽  
Manfred Hoefs ◽  
Robert L. Glaze ◽  
Homer S. Ellsworth
Keyword(s):  
Yukon Territory ◽  
Ovis Dalli ◽  
Dall’S Sheep

Upper Canines in Dall's Sheep (Ovis dalli dalli)

1984 ◽  
Vol 20 (2) ◽  
pp. 158-161 ◽  
Author(s):  
Thomas D. Bunch ◽  
Manfred Hoefs ◽  
Robert L. Glaze
Keyword(s):  
Ovis Dalli ◽  
Dall’S Sheep

scholarly journals HEMATOLOGIC, SERUM CHEMISTRY AND SEROLOGIC VALUES OF DALL'S SHEEP (OVIS DALLI DALLI) IN ALASKA

1983 ◽  
Vol 19 (2) ◽  
pp. 136-139 ◽  
Author(s):  
W. J. Foreyt ◽  
T. C. Smith ◽  
J. F. Evermann ◽  
W. E. Heimer
Keyword(s):  
Serum Chemistry ◽  
Ovis Dalli ◽  
Dall’S Sheep

HORN ABERRATIONS IN DALL'S SHEEP (OVIS DALLI) FROM YUKON TERRITORY, CANADA

1982 ◽  
Vol 18 (3) ◽  
pp. 297-304
Author(s):  
MANFRED HOEFS ◽  
THOMAS D. BUNCH ◽  
ROBERT L. GLAZE ◽  
HOMER S. ELLSWORTH
Keyword(s):  
Yukon Territory ◽  
Ovis Dalli ◽  
Dall’S Sheep
Sign in / Sign up

Export Citation Format

Share Document