Territoriality in Pronghorn Bucks on the National Bison Range, Moiese, Montana

Bromley, Peter T.

doi:10.2307/1378632

Cited by 20 publications

(8 citation statements)

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“…Komers, unpublished data). Observations using binoculars or a spotting scope were made at a range of 100-1000 m from the pronghorns when observers were on foot or within a vehicle (Bromley 1969;Goldsmith 1990;Maher 1991). Some observations of pronghorns within close proximity to the road were conducted using a drive-by method that we referred to as the Russian tank maneuver (RTM), which involved using the vehicle as a blind.…”

Section: Methodsmentioning

confidence: 99%

Do pronghorn (Antilocapra americana) perceive roads as a predation risk?

Gavin

Komers

2006

Can. J. Zool.

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The risk-disturbance hypothesis proposes that organisms respond to generalized threat stimuli; therefore, human disturbances that elicit these behaviours will cause individuals to behave similarly to avoid a natural predator. Studies have shown that pronghorn antelope, Antilocapra americana (Ord, 1815), are influenced by human disturbances. We examined several intensities of human activity and distance from disturbances as indicators of risk perception in pronghorns. We investigated whether pronghorns exhibited risk-avoidance behaviour towards road traffic consistent with the risk-disturbance hypothesis by comparing vigilance and foraging behaviour observations across increasing traffic levels and proximity to roads. Pronghorns showed higher vigilance and lower foraging times along high traffic roads during the spring season compared with lower traffic levels, suggesting that risk perception is related to traffic level. Moreover, individuals within close proximity to roads regardless of traffic level exhibited higher vigilance levels, indicating that there is an overall risk perceived towards roads. Our results also suggest that individuals in herds with young are more risk averse than other social groupings and individuals in larger groups perceive less risk. We suggest that consequences of risk-avoidance behaviour should be reflected in land-use plans that address road densities and traffic levels to better manage wildlife.Résumé : L'hypothèse du risque-perturbation prédit que les organismes réagissent aux stimulus généraux de menace; en conséquence, les perturbations anthropiques qui provoquent ces comportements devraient amener les individus à se comporter comme s'ils évitaient un prédateur naturel. Des études montrent que les pronghorns, Antilocapra americana (Ord, 1815), sont affectés par les perturbations anthropiques. Nous avons examiné diverses intensités d'activité humaine et diverses distances des perturbations comme indicateurs de la perception du risque chez les pronghorns. Nous avons vérifié si les pronghorns ont un comportement d'évitement des risques en réaction à la circulation automobile selon les prédictions de l'hypothèse du risque-perturbation en comparant les observations des comportements de vigilance et d'alimentation en fonction de diverses intensités de circulation automobile et de proximité des routes. Durant la saison du printemps, les pronghorns sont plus vigilants et passent moins de temps à s'alimenter près des routes à forte circulation par rapport aux routes à circulation moins grande, ce qui laisse croire qu'il y a une perception du risque relié à l'intensité de la circulation. De plus, quelle que soit l'intensité de la circulation, les individus les plus près des routes ont des niveaux de vigilance plus élevés, ce qui indique qu'il y a une perception d'un risque global en relation avec les routes. Nos résultats indiquent aussi que les individus appartenant à des troupeaux avec jeunes sont plus intolérants aux risques que les autres groupes sociaux et que les individus appartenan...

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Section: Methodsmentioning

confidence: 99%

Do pronghorn (Antilocapra americana) perceive roads as a predation risk?

Gavin

Komers

2006

Can. J. Zool.

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“…Observations of the nature and possible signifieance of other subgroups oecasionaUy observed were hampered by the laek of marked antelope. one or several buck territories (Bromley 1969, Kitchen 1974. Most territorial bucks were mature males 2-years-old and older; one yearling buck in the Iverson pasture was territorial (due to the lack of a mature male) and apparently bred successfully.…”

Section: Herds and Herd Rangesmentioning

confidence: 99%

American pronghorn antelope in the Yellow Water Triangle, Montana : a study of social distribution, population dynamics, and habitat use /

Pyrah¹

1987

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Excellent descriptions of geology, soils, climate, vegetation, and history ol the study area are provided in Gieseker et al (1953), Cole (1 956), Bayless (1969), and Jorgensen (1979). The following summarizes those accounts while adding details particularly relevant to antelope eeology. Location The Yellow Water Triangle (266 mi^) is near the geographie center of Montana (Fig. 2); 62% of the land area falls within Petroleum County and 38% within Fergus County (Jorgensen 1979). The area is enclosed by U.S. Highway 87 (20 mi from Grass Range to FlatwiUow Road), Montana Highway 200 (23 mi from Grass Range to Winnett), Montana Highway 244 (18 mi from Winnett to FlatwiUow Road), and FlatwiUow Road (5 mi from U.S. Highway 87 to Montana Highway 244). Drainages of two minor permanent streams (FlatwiUow and McDonald Creeks) and three intermittent streams (Pike, Elk, and YeUow Water Creeks) paraUel one another across the study area. The name "YeUow Water" is derived from the discoloration of the stream by yellowish bentonite from certain geologieal formations (Jorgensen pers. comm.). Geology and Soils Relief slopes upward from east to west. AU geologieal formations tilt easterly and thus have lower strata exposed at higher elevations toward the west. Elevations range from 3,000 ft at Winnett to 4,500 ft atop Button Butte in the northwest quarter near Grass Range. The topography varies from flat to gently roUing along an elevational gradient that increases an average of approximately 20 ft/mi along MeDonald Creek between Winnett and Grass Range. Most topographical rehef stems from geological relics of hiUs, buttes, and ridges or stream erosion vaUeys, coulees, and draws cut below the level of the prairie plateau. Most of these topographic relics have immediate elevational changes of less than 100 ft.

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“…Searcy (1979) argued that mate choice in female red-winged blackbirds (Agelaius phoenicus) is influenced by availability of food in the territory. Bromley (1969), David (1973), Franklin (1978), Leuthold (1966) and Spinage (1974) have used the amount of time family groups or territorial males spend away from their territories as an index of territory quality.…”

Section: Discussionmentioning

confidence: 99%

Size and spacing of sedentary guanaco family groups

Jefferson¹,

Thomas²

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Territoriality in Pronghorn Bucks on the National Bison Range, Moiese, Montana

Cited by 20 publications

References 12 publications

Do pronghorn (Antilocapra americana) perceive roads as a predation risk?

Do pronghorn (Antilocapra americana) perceive roads as a predation risk?

American pronghorn antelope in the Yellow Water Triangle, Montana : a study of social distribution, population dynamics, and habitat use /

Size and spacing of sedentary guanaco family groups

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