Desert bighorn sheep (Ovis canadensis) recognition from camera traps based on learned features

2021 ◽  
pp. 101328
Author(s):  
Manuel Vargas-Felipe ◽  
Luis Pellegrin ◽  
Aldo A. Guevara-Carrizales ◽  
A. Pastor López-Monroy ◽  
Hugo Jair Escalante ◽  
...  
Keyword(s):  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Camera Traps ◽  
Desert Bighorn Sheep ◽  
Learned Features

scholarly journals Desert Bighorn Sheep: Changes in Genetic Variation Over Time and the Impact of Merging Populations

2014 ◽  
Vol 5 (1) ◽  
pp. 3-13 ◽  
Author(s):  
Philip W. Hedrick ◽  
John D. Wehausen
Keyword(s):  
Genetic Variation ◽  
New Mexico ◽  
Monitoring And Evaluation ◽  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Mexican Population ◽  
Desert Bighorn Sheep ◽  
Two Generations ◽  
The Impact ◽  
Over Time

Abstract Founder effects, genetic bottlenecks, and genetic drift in general can lead to low levels of genetic diversity, which can influence the persistence of populations. We examine genetic variation in two populations of desert bighorn sheep Ovis canadensis from New Mexico and Mexico to measure change over time and evaluate the impact of introducing individuals from one population into the other. Over about three generations, the amount of genetic variation in the New Mexico population increased. In contrast, over about two generations the amount of genetic variation in the Mexican population decreased by a great extent compared with an estimate from another Mexican population from which it is primarily descended. The potential reasons for these changes are discussed. In addition, although both populations have low genetic variation, introduction of Mexican rams into the New Mexico population might increase the amount of genetic variation in the New Mexico population. Overall, it appears that management to increase genetic variation might require substantial detailed monitoring and evaluation of ancestry from the different sources and fitness components.

Population subdivision among desert bighorn sheep ( Ovis canadensis ) ewes revealed by mitochondrial DNA analysis

1999 ◽  
Vol 8 (1) ◽  
pp. 99-106 ◽  
Author(s):  
W. M. Boyce ◽  
R. R. Ramey ◽  
T. C. Rodwell ◽  
E. S. Rubin ◽  
R. S. Singer
Keyword(s):  
Mitochondrial Dna ◽  
Dna Analysis ◽  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Population Subdivision ◽  
Desert Bighorn Sheep ◽  
Mitochondrial Dna Analysis

scholarly journals An Analysis of Composition, Distribution, and Habitat Use of Reintroduced Desert Bighorn Sheep in Arches National Park, Utah

1989 ◽  
Vol 13 ◽  
pp. 5-6
Author(s):  
C. Haas ◽  
Gar Workman
Keyword(s):  
Habitat Use ◽  
National Park ◽  
Social Dynamics ◽  
National Park Service ◽  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Desert Bighorn Sheep ◽  
Use Patterns ◽  
Habitat Analysis ◽  
Park Service

The ecology of a reintroduced population of desert bighorn sheep (Ovis canadensis nelsoni} is being investigated in Arches National Park. National Park Service objectives are: (1) determine general ecological parameters, including population and social dynamics, seasonal distribution and habitat use patterns, and general health characteristics; and (2) develop a comprehensive program of habitat analysis and evaluation that can be used to determine habitat suitability and identify transplant sites in other National Park Service units.

scholarly journals Accurate population estimation of Caprinae using camera traps and distance sampling

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Grant M. Harris ◽  
Matthew J. Butler ◽  
David R. Stewart ◽  
Eric M. Rominger ◽  
Caitlin Q. Ruhl
Keyword(s):  
Chihuahuan Desert ◽  
Distance Sampling ◽  
Sampling Technique ◽  
Ovis Canadensis ◽  
Camera Traps ◽  
Distribution Data ◽  
Confidence Bounds ◽  
Desert Bighorn Sheep ◽  
Capture Recapture ◽  
Data Deficient

Abstract With most of the world’s Caprinae taxa threatened with extinction, the IUCN appeals to the development of simple and affordable sampling methods that will produce credible abundance and distribution data for helping conserve these species inhabiting remote areas. Traditional sampling approaches, like aerial sampling or mark-capture-recapture, can generate bias by failing to meet sampling assumptions, or by incurring too much cost and logistical burden for most projects to address them. Therefore, we met the IUCN’s challenge by testing a sampling technique that leverages imagery from camera traps with conventional distance sampling, validating its operability in mountainous topography by comparing results to known abundances. Our project occurred within a captive facility housing a wild population of desert bighorn sheep (Ovis canadensis) in the Chihuahuan desert of New Mexico, which is censused yearly. True abundance was always within our 90% confidence bounds, and the mean abundance estimates were within 4.9 individuals (average) of the census values. By demonstrating the veracity of this straightforward and inexpensive sampling method, we provide confidence in its operability, urging its use to fill conservation voids for Caprinae and other data-deficient species inhabiting rugged or heavily vegetated terrain.

Seasonal variation of red blood cell survival in desert bighorn sheep (Ovis canadensis cremnobates)

1984 ◽  
Vol 62 (7) ◽  
pp. 1227-1231 ◽  
Author(s):  
Jack C. Turner
Keyword(s):  
Body Weight ◽  
Seasonal Variation ◽  
Life Span ◽  
Blood Cells ◽  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Desert Bighorn Sheep ◽  
The Mean ◽  
Ad Libitum ◽  
Free Ranging

The life-span of red blood cells (RBCs) in captive and free-ranging desert bighorn sheep was measured with [32P]diisopropylfluorophosphate. The mean winter RBC life-span (156.6 days) was not significantly affected by season for captive animals maintained on a high nutritional plane and water, ad libitum. Free-ranging bighorn demonstrated a significant (P < 0.001) difference between mean winter (155.9 days) and summer (203.9 days) RBC survival. Dehydration of captive bighorn significantly increased RBC survival, closely approximating that found in summer free-ranging animals. Desert bighorn RBCs exhibited an aseasonal facultative response to the availability of water. RBC life-span was significantly (P < 0.05) increased from 153.5 to 197.7 days in animals experiencing extreme dehydration. The large spleen, relative to body weight, may accommodate extensive fluctuations in total RBC volume measured during dehydration and rehydration, preventing premature RBC degradation and an increased water requirement.

The Isolation and Partial Characterization of A Babesia Sp. From Desert Bighorn Sheep (Ovis Canadensis Nelsoni)

1993 ◽  
Vol 40 (3) ◽  
pp. 237-243 ◽  
Author(s):  
WILL L. GOFF ◽  
DAVID A. JESSUP ◽  
KENNETH A. WALDRUP ◽  
JOHN W. THOMFORD ◽  
PATRICIA A. CONRAD ◽  
...  
Keyword(s):  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Partial Characterization ◽  
Desert Bighorn Sheep ◽  
Ovis Canadensis Nelsoni

RECENT RECORDS OF DESERT BIGHORN SHEEP (OVIS CANADENSIS MEXICANA) IN EASTERN SONORA AND NORTHWESTERN CHIHUAHUA, MEXICO

2006 ◽  
Vol 51 (3) ◽  
pp. 430-434 ◽  
Author(s):  
Karla Pelz-Serrano ◽  
Eduardo Ponce-Guevara ◽  
Rodrigo Sierra-Corona ◽  
Rurik List ◽  
Gerardo Ceballos
Keyword(s):  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Desert Bighorn Sheep ◽  
Ovis Canadensis Mexicana

Some Weights and Measurements of Desert Bighorn Sheep (Ovis canadensis nelsoni)

1958 ◽  
Vol 22 (4) ◽  
pp. 444 ◽  
Author(s):  
M. Clair Aldous ◽  
Frank C. Craighead ◽  
George A. Devan
Keyword(s):  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Desert Bighorn Sheep ◽  
Ovis Canadensis Nelsoni
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