scholarly journals Waterhole detection using a vegetation index in desert bighorn sheep (Ovis canadensis cremnobates) habitat

PLoS ONE ◽  
2019 ◽  
Vol 14 (1) ◽  
pp. e0211202 ◽  
Author(s):  
Jonathan Gabriel Escobar-Flores ◽  
Sarahi Sandoval ◽  
Raul Valdez ◽  
Eahsan Shahriary ◽  
Jorge Torres ◽  
...  
Keyword(s):  
Vegetation Index ◽  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Desert Bighorn Sheep

scholarly journals Detection of waterholes by Vegetation Index in the habitat of bighorn sheep (Ovis Canadensis) in Baja California

2017 ◽  
Author(s):  
Jonathan Gabriel Escobar-Flores ◽  
Jorge Torres ◽  
Raúl Valdez ◽  
Sergio Álvarez Cárdenas ◽  
Patricia Galina Tessaro ◽  
...  
Keyword(s):  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Arid Ecosystems ◽  
Landsat 8 ◽  
Desert Bighorn Sheep ◽  
False Color ◽  
Juncus Acutus ◽  
Color Composite

The desert bighorn sheep is adapted to the extreme conditions of arid ecosystems. The amount and distribution of watering holes is an essential component of the habitat of this species. With information provided by people in Sierra Santa Isabel a database of potential sites watering sites was obtained, which was taken as reference of spectral information for water and vegetation. Two images of Landsat 8-OLI were processed; the first corresponded to the end of the drought and the second rainy season of 2013. A false-color composite was made between bands where water has an absorption behavior (band 5 and 7) and a Normalized Difference Vegetation Index (NDVI). Field visits to the existence of 15 watering holes of which 11 had evidence of use by the bighorn were confirmed. The abundance of plant species Tamarix ramosissima, Juncus acutus, Typha domingensis and Psorathamnus spinosus contributed substantially NDVI values and facilitated the detection of watering holes.

scholarly journals Detection of waterholes by Vegetation Index in the habitat of bighorn sheep (Ovis Canadensis) in Baja California

2017 ◽  
Author(s):  
Jonathan Gabriel Escobar-Flores ◽  
Jorge Torres ◽  
Raúl Valdez ◽  
Sergio Álvarez Cárdenas ◽  
Patricia Galina Tessaro ◽  
...  
Keyword(s):  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Arid Ecosystems ◽  
Landsat 8 ◽  
Desert Bighorn Sheep ◽  
False Color ◽  
Juncus Acutus ◽  
Color Composite

The desert bighorn sheep is adapted to the extreme conditions of arid ecosystems. The amount and distribution of watering holes is an essential component of the habitat of this species. With information provided by people in Sierra Santa Isabel a database of potential sites watering sites was obtained, which was taken as reference of spectral information for water and vegetation. Two images of Landsat 8-OLI were processed; the first corresponded to the end of the drought and the second rainy season of 2013. A false-color composite was made between bands where water has an absorption behavior (band 5 and 7) and a Normalized Difference Vegetation Index (NDVI). Field visits to the existence of 15 watering holes of which 11 had evidence of use by the bighorn were confirmed. The abundance of plant species Tamarix ramosissima, Juncus acutus, Typha domingensis and Psorathamnus spinosus contributed substantially NDVI values and facilitated the detection of watering holes.

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.

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 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.

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
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