Foraging behaviour and sexual segregation in bighorn sheep

1998 ◽  
Vol 56 (1) ◽  
pp. 99-106 ◽  
Author(s):  
KATHREEN E RUCKSTUHL
Keyword(s):  
Foraging Behaviour ◽  
Bighorn Sheep ◽  
Sexual Segregation

Sexual segregation in the foraging behaviour of a slightly dimorphic seabird: Influence of the environment and fishery activity

2021 ◽  
Author(s):  
José Manuel Reyes‐González ◽  
Fernanda De Felipe ◽  
Virginia Morera‐Pujol ◽  
Andrea Soriano‐Redondo ◽  
Leia Navarro‐Herrero ◽  
...  
Keyword(s):  
Foraging Behaviour ◽  
Sexual Segregation

Roads, routes and rams: does sexual segregation contribute to anthropogenic risk in a desert-dwelling ungulate?

2016 ◽  
Vol 43 (5) ◽  
pp. 380 ◽  
Author(s):  
Vernon C. Bleich ◽  
Jericho C. Whiting ◽  
John G. Kie ◽  
R. Terry Bowyer
Keyword(s):  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Sexual Segregation ◽  
Adult Males ◽  
Large Mammals ◽  
Male And Female ◽  
Use Of Resources ◽  
Core Areas ◽  
Males And Females ◽  
Time Of Year

Context Little is known about the consequences of sexual segregation (differential use of resources by the sexes outside of the mating season) for the conservation of large mammals. Roadways (i.e. the strip of land over which a road or route passes) are ubiquitous around the world, and are a major cause of wildlife mortality, as well as habitat loss and fragmentation. Many populations of bighorn sheep (Ovis canadensis) occur at low densities and in a metapopulation structure. Roadways could affect movements of males and females differentially, an outcome that has not been considered previously. Aims We investigated the propensity of the sexes to cross a paved two-lane road and a single-lane, maintained dirt route and predicted that adult males, because of their life-history characteristics, would cross those roadways more often than females. Methods We investigated movements of male and female bighorn sheep from 1986 to 1990. We used a fixed-wing aircraft with an H-antenna on each wing strut to locate individuals each week from October 1986 to December 1990. We estimated the degree of overlap among 50% core areas of use by males and females with the utilisation distribution overlap index (UDOI). Key results We relocated male and female bighorn sheep on 948 occasions during sexual aggregation and on 1951 occasions during sexual segregation. More males than females were likely to cross both types of roadways during segregation, and the dirt route during aggregation. Propensity of males and females to cross roadways was strongly influenced by time of year (i.e. whether the period of sexual aggregation or sexual segregation). The lowest overlap in 50% core areas was between females and males during periods of segregation (UDOI = 0.1447). Conclusions More males than females crossed Kelbaker Road and the unnamed dirt route during segregation, as well as the unnamed route during aggregation. Both of those features could affect males more than females, and could result in reductions in the use of habitat or increased mortality of bighorn sheep from vehicle collisions as a result of spatial segregation of the sexes. Implications During environmental review, biologists should consider sexual segregation when assessing potential anthropogenic effects on movements of bighorn sheep. Biologists also should consider sexual segregation and how roadways, even lightly traveled routes, affect movements of male and female ungulates differently before manipulating habitat, translocating animals, or constructing or modifying roadways.

scholarly journals Diet and sexual segregation of desert bighorn sheep (Ovis canadensis mexicana Merriam) in Sonora, Mexico

2021 ◽  
Author(s):  
Fernando Isaac Gastelum-Mendoza ◽  
Luis Antonio Tarango-Arámbula ◽  
Genaro Olmos-Oropeza ◽  
Jorge Palacio-Núñez ◽  
Diego Valdez-Zamudio ◽  
...  
Keyword(s):  
Diversity Index ◽  
Similarity Index ◽  
Food Preferences ◽  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Sexual Segregation ◽  
Desert Bighorn Sheep ◽  
Fecal Samples ◽  
A Cell ◽  
Species Being

Objective: To determine the diet of the desert bighorn sheep and to identify differencesin its composition between sexes during the reproductive and sexual segregation periods.Design/methodology/approach: The study was carried in the UMA Rancho NocheBuena, Hermosillo, Sonora. The microhistological technique and a cell catalog of plantsfrom the study area were used to identify plant species present in fecal samples ofbighorn sheep. The relative frequency, the Shannon-Weaver diversity index and theKulczynski similarity index were determined by sex and period (reproductive andsegregation)Results: The diet of bighorn sheep included 40 species, being herbaceous (36.1 ±4.4%) and grasses (26.8 ±8.9 %) the most common. The diet of males during thesegregation period was mainly composed of grasses (36.2%) and female diet byherbaceous (30%) and grasses (29.8%). No differences were found in the diversity ofthe diet of males and females in the segregation period (H '= 1.0) and in general, their diets were very similar (80%).Limitations/implications: To collect a greater number of fecal samples by sex andperiod (reproductive and segregation) and to analyze the nutritional content of plantsconsumed by bighorn sheep.Findings/conclusions: In this study, the sexual segregation exhibited by the bighornsheep in the Wildlife Management and Conservation Unit Rancho Noche Buena was notdue to food preferences.

Sexual segregation in moose Alces alces: an experimental manipulation of foraging behaviour

2004 ◽  
Vol 10 (1) ◽  
pp. 59-72 ◽  
Author(s):  
Douglas F. Spaeth ◽  
R. Terry Bowyer ◽  
Thomas R. Stephenson ◽  
Perry S. Barboza
Keyword(s):  
Foraging Behaviour ◽  
Alces Alces ◽  
Experimental Manipulation ◽  
Sexual Segregation

Sexual segregation and use of water by bighorn sheep: implications for conservation

2010 ◽  
Vol 13 (6) ◽  
pp. 541-548 ◽  
Author(s):  
J. C. Whiting ◽  
R. T. Bowyer ◽  
J. T. Flinders ◽  
V. C. Bleich ◽  
J. G. Kie
Keyword(s):  
Bighorn Sheep ◽  
Sexual Segregation

scholarly journals Sexual Segregation in Sierra Nevada Bighorn Sheep, Ovis canadensis sierrae: Ramifications for Conservation

2010 ◽  
Vol 42 (4) ◽  
pp. 476-489 ◽  
Author(s):  
Cody A. Schroeder ◽  
R. Terry Bowyer ◽  
Vernon C. Bleich ◽  
Thomas R. Stephenson
Keyword(s):  
Sierra Nevada ◽  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Sexual Segregation ◽  
Ovis Canadensis Sierrae

Sexual segregation in desert bighorn sheep (Ovis canadensis mexicana)

Behaviour ◽  
2003 ◽  
Vol 140 (2) ◽  
pp. 183-207 ◽  
Author(s):  
Ian Fraser ◽  
Thomas Fitzpatrick ◽  
Jill Benjamin ◽  
Eric Rominger ◽  
Tara Nishihira ◽  
...  
Keyword(s):  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Sexual Segregation ◽  
Desert Bighorn Sheep ◽  
Ovis Canadensis Mexicana

The role of foraging behaviour in the sexual segregation of the African elephant

Oecologia ◽  
2006 ◽  
Vol 150 (2) ◽  
pp. 344-354 ◽  
Author(s):  
Graeme Shannon ◽  
Bruce R. Page ◽  
Kevin J. Duffy ◽  
Rob Slotow
Keyword(s):  
Foraging Behaviour ◽  
Sexual Segregation ◽  
African Elephant

Influence of intrinsic variation on foraging behaviour of adult female Australian fur seals

2015 ◽  
Vol 526 ◽  
pp. 227-239 ◽  
Author(s):  
AJ Hoskins ◽  
DP Costa ◽  
KE Wheatley ◽  
JR Gibbens ◽  
JPY Arnould
Keyword(s):  
Adult Female ◽  
Foraging Behaviour ◽  
Fur Seals
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