Evidence for interspecific competition between feral ass Equus asinus and mountain sheep Ovis canadensis in a desert environment

Marshal, Jason P.; Bleich, Vernon C.; Andrew, Nancy

doi:10.2981/0909-6396(2008)14[228:eficbf]2.0.co;2

Cited by 24 publications

(23 citation statements)

References 25 publications

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“…The most frequent type of competition among large herbivores is exploitation competition (Dolman and Wäber 2008), which occurs when the use of a resource by one individual reduces the availability of that resource to another individual [Johnson et al (2000) for an example in mule deer Odocoileus hemionus and elk Cervus elaphus]. Many studies have suggested that, when resources are limited, the potential for competition is high among sympatric species of large herbivores, which often have overlaps in habitats and nutritional niches [Bartos et al (2002) for white-tailed deer Odocoileus virginianus, fallow deer Dama dama, red deer Cervus elaphus, and roe deer Capreolus capreolus; Focardi et al (2006) for roe deer and fallow deer; Hemami et al (2004) for roe deer and muntjac Muntiacus reevesi; Marshal et al (2008) for feral ass Equus asinus and mountain sheep Ovis canadensis].…”

Section: Introductionmentioning

confidence: 97%

High red deer density depresses body mass of roe deer fawns

et al. 2009

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Many previous studies have pointed out that, when resources are limited, the potential for competition should be high among sympatric species that display overlaps in habitat and nutritional niches. However, reliable evidence of competition between red deer (Cervus elaphus) and roe deer (Capreolus capreolus) has not been yet reported for life history traits directly measuring performance such as body mass, reproduction, or survival. From long-term monitoring of deer populations in the reserve of La Petite Pierre (France), we measured the sex-specific responses of roe deer fawn body mass to changes in red deer density after accounting for possible confounding effects of date of shooting, climatic conditions, and roe deer density. As expected under the hypothesis of competition, red deer density in a given year had a marked negative influence on body mass of roe deer fawns born the same year and the following year. Fawn mass of roe deer males and females responded in similar ways to changes in red deer density. Our study provides the first evidence of a negative response of roe deer performance to high red deer density.

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Section: Introductionmentioning

confidence: 97%

High red deer density depresses body mass of roe deer fawns

et al. 2009

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“…The presence of feral horses and donkeys reduces abundance, population growth, and the use of water sources by bighorn sheep, Ovis canadensis (Marshal et al. ; Ostermann‐Kelm et al. ).…”

Section: Introductionmentioning

confidence: 99%

Assessing the cryptic invasion of a domestic conspecific: American mink in their native range

Beauclerc

Bowman

Schulte‐Hostedde

2013

Ecology and Evolution

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Control of invasions is facilitated by their early detection, but this may be difficult when invasions are cryptic due to similarity between invaders and native species. Domesticated conspecifics offer an interesting example of cryptic invasions because they have the ability to hybridize with their native counterparts, and can thus facilitate the introgression of maladaptive genes. We assessed the cryptic invasion of escaped domestic American mink (Neovison vison) within their native range. Feral mink are a known alien invader in many parts of the world, but invasion of their native range is not well understood. We genetically profiled 233 captive domestic mink from different farms in Ontario, Canada and 299 free-ranging mink from Ontario, and used assignments tests to ascertain genetic ancestries of free-ranging animals. We found that 18% of free-ranging mink were either escaped domestic animals or hybrids, and a tree regression showed that these domestic genotypes were most likely to occur south of a latitude of 43.13°N, within the distribution of mink farms in Ontario. Thus, domestic mink appear not to have established populations in Ontario in locations without fur farms. We suspect that maladaptation of domestic mink and outbreeding depression of hybrid and introgressed mink have limited their spread. Mink farm density and proximity to mink farms were not important predictors of domestic genotypes but rather, certain mink farms appeared to be important sources of escaped domestic animals. Our results show that not all mink farms are equal with respect to biosecurity, and thus that the spread of domestic genotypes can be mitigated by improved biosecurity.

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“…Overlap in use of range and diet, as a consequence of common use of habitat (Dunn and Douglas, 1982) and forage (Ginnett and Douglas, 1982), have raised concerns among wildlife managers about possible competition between feral asses (Equus asinus) and bighorn sheep. Only recently, however, has evidence suggested that population-level effects occur in bighorn sheep as a consequence of overlaps in habitat or diet with feral asses (Marshal et al, 2008).…”

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confidence: 99%

Overlap in Diet and Habitat Between the Mule Deer (Odocoileus hemionus) and Feral Ass (Equus asinus) in the Sonoran Desert

Marshal

Bleich

Krausman

et al. 2012

The Southwestern Naturalist

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Evidence for interspecific competition between feral ass Equus asinus and mountain sheep Ovis canadensis in a desert environment

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 24 publications

References 25 publications

High red deer density depresses body mass of roe deer fawns

High red deer density depresses body mass of roe deer fawns

Assessing the cryptic invasion of a domestic conspecific: American mink in their native range

Overlap in Diet and Habitat Between the Mule Deer (Odocoileus hemionus) and Feral Ass (Equus asinus) in the Sonoran Desert

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