Factors Influencing Reproductive Success Of Ferruginous Hawks in the Uintah Basin, Utah

Keough, Heather L.; Conover, Michael R.; Roberts, Anthony J.

doi:10.3356/0892-1016-49.2.161

Cited by 7 publications

(10 citation statements)

References 26 publications

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“…Data were only included when the type of injuries indicated which predator was responsible. For example, a sage‐grouse killed by an eagle (Accipitridae) can be identified by the spread of talon injuries (Keough et al ).…”

Section: Methodsmentioning

confidence: 99%

“…Data were only included when the type of injuries indicated which predator was responsible. For example, a sage-grouse killed by an eagle (Accipitridae) can be identified by the spread of talon injuries (Keough et al 2015). We classified predators of sage-grouse into 3 groups: those that depredated nests, those that killed juveniles (i.e., sagegrouse <1 year old, including chicks), and those that killed adults (birds >1 year old; Eng 1955).…”

Section: Methodsmentioning

confidence: 99%

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Predators, predator removal, and sage‐grouse: A review

Conover

Roberts

2016

J Wildl Manag

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Populations of greater sage‐grouse (Centrocercus urophasianus; sage‐grouse) have been in a decline since the nineteenth century. We used our research, unpublished reports, and scientific literature to identify which predators kill sage‐grouse and to assess whether lethal control of these predators benefited the species. We also asked state wildlife biologists and scientists whether they had ever witnessed a predator kill sage‐grouse. We identified 266 instances where the predator responsible for depredating nests or killing juvenile or adult sage‐grouse could be ascertained. Most adult sage‐grouse were killed by eagles (Accipitridae), owls (Strigiformes), coyotes (Canis latrans), or red foxes (Vuples vulpes). Based on nest cameras, most depredated eggs are taken by common ravens (Corvus corax), badgers (Taxidae taxus), or coyotes. There are too few studies to conclude that predator removal increases survival rates of juvenile or adult sage‐grouse. No study has been conducted to determine whether badger removal increases nest success of sage‐grouse, and the only study on coyote removal produced ambiguous results. Several studies reported that more sage‐grouse nests are successful (i.e., >1 eggs hatched) in areas where common ravens were removed or in areas where raven densities were lower than in other areas. The data we reviewed did not indicate predators played a role in the decline during the past century, but increasing numbers of ravens since the 1970s may have contributed to the declining sage‐grouse populations in recent decades. We conclude that removing common ravens can increase nest success, although not necessarily sage‐grouse abundance. Without a better understanding of sage‐grouse and their predators, wildlife biologists will be handicapped in their efforts to prevent sage‐grouse populations from continuing to decline. © 2016 The Wildlife Society.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Predators, predator removal, and sage‐grouse: A review

Conover

Roberts

2016

J Wildl Manag

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“…Harmata et al (2001) reported the death of four juvenile Ferruginous Hawks that died prior to dispersing from their natal areas in Montana; the authors believed that two died of unknown causes and two were killed by mammalian predators. Keough (2006) 31 died before dispersing from their natal territories. Of these, 17 were killed by avian predators, 5 were killed by mammalian predators, 3 were killed by an unknown predator, 5 died from natural causes (injury, exposure, disease, or starvation), and 1 from an unknown cause.…”

Section: Discussionmentioning

confidence: 99%

Survival of Juvenile Ferruginous Hawks in Utah

Ward¹,

Conover²

2013

Journal of Raptor Research

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“…Western mosquitofish prey on eggs and larvae and may pose a risk to the ARS in several Oklahoma rivers, including the Canadian River (Pigg and others, 1999). Additional background information on the Arkansas River shiner can be found in the SGP pre-assessment report (Roberts, 2015).…”

Section: Introductionmentioning

confidence: 99%