Journal ArticleDOI
Range Expansion of Barred Owls, Part II: Facilitating Ecological Changes
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Overall, it appears the historical lack of trees in the Great Plains acted as a barrier to the range expansion and recent increases in forests broke down this barrier and allowed Barred Owls to move westward.Abstract:
In Part I (Livezey, 2009), I presented the chronology and distribution of the range expansion of Barred Owls (Strix varia) from the late 1800s to the present. Here I explore what had prevented Barred Owls from expanding their range westward during recent millennia and what allowed them to do so during the past century. Using strength-of-evidence analysis, I evaluate the plausibility of the five ecological or behavioral changes proposed in the literature to have facilitated the range expansion. From this evaluation, three of these changes appear to be implausible, one appears to be plausible after modifying its location, and one appears to be very plausible. For the very plausible one, I score seven ecological changes that may have affected it using five strength-of-evidence criteria. Overall, it appears the historical lack of trees in the Great Plains acted as a barrier to the range expansion and recent increases in forests broke down this barrier. Increases in forest distribution along the Misso...read more
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Journal ArticleDOI
The impacts of beavers Castor spp. on biodiversity and the ecological basis for their reintroduction to Scotland, UK
TL;DR: The mechanisms by which beavers act as ecosystem engineers are investigated, the possible impacts of beavers on the biodiversity of Scotland are discussed, and a widespread positive influence on biodiversity is expected, if beavers are widely reintroduced.
Journal ArticleDOI
Neighborhood and habitat effects on vital rates: expansion of the Barred Owl in the Oregon Coast Ranges
Charles B. Yackulic,Charles B. Yackulic,Janice A. Reid,Raymond J. Davis,James E. Hines,James D. Nichols,Eric D. Forsman +6 more
TL;DR: This paper modify dynamic occupancy models developed for detection-nondetection data to allow for the dependence of local vital rates on neighborhood occupancy, and concludes that all covariates used to model detection probability lead to improved AIC, that regional occupancy influences colonization and extinction rates, and that habitat plays an important role in determining extinction and colonization rates.
Journal ArticleDOI
Range Expansion of Barred Owls, Part I: Chronology and Distribution
TL;DR: More than 12,500 records of Barred Owls in their expanded range from the earliest records to the present are mapped, the species' distribution is drawn and the general timing and flow of the range expansion is inferred.
Journal ArticleDOI
The past and future roles of competition and habitat in the range-wide occupancy dynamics of Northern Spotted Owls
Charles B. Yackulic,Larissa L. Bailey,Katie M. Dugger,Raymond J. Davis,Alan B. Franklin,Eric D. Forsman,Steven H. Ackers,Lawrence S. Andrews,Lowell V. Diller,Scott A. Gremel,Keith A. Hamm,Dale R. Herter,J. Mark Higley,Rob B. Horn,Christopher McCafferty,Janice A. Reid,Jeremy T. Rockweit,Stan G. Sovern +17 more
TL;DR: This study suggests how intensive management actions (removal of a competitor) with rapid results can complement a slower management action (i.e., promoting forest succession) in order to promote the persistence of northern spotted owl populations.
Journal ArticleDOI
Northern Spotted Owl (Strix occidentalis caurina) Genome: Divergence with the Barred Owl (Strix varia) and Characterization of Light-Associated Genes.
Zachary R. Hanna,James B. Henderson,Jeffrey D. Wall,Christopher A. Emerling,Jérôme Fuchs,Jérôme Fuchs,Charles Runckel,Charles Runckel,David P. Mindell,Rauri C. K. Bowie,Joseph L. DeRisi,Joseph L. DeRisi,John P. Dumbacher +12 more
TL;DR: It is suggested that most light-associated gene functions have been maintained in owls and their loss has not proceeded to the same extent as in other dim-light-adapted vertebrates.
References
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Journal ArticleDOI
Disturbance, Diversity, and Invasion: Implications for Conservation
TL;DR: The natural disturbance regime is now unlikely to persist within conser- vation area since fragmentation and human intervention have usually modified physical and biotic conditionx Active management decisions must now be made on what distur- bance regime is require and this requires decisions on what species are to be encouraged or discouraged.
Journal ArticleDOI
Do Habitat Corridors Provide Connectivity
Paul Beier,Reed F. Noss +1 more
TL;DR: In this article, the authors reviewed published studies that empirically addressed whether corridors enhance or diminish the population viability of species in habitat patches connected by cor- ridors and concluded that corridors are valuable conservation tools.
Journal ArticleDOI
Ecological Costs of Livestock Grazing in Western North America
TL;DR: The pastoreo de ganado is the practice of manejo de la tierra mas ampliamente utilizada in the oeste de Norte America as mentioned in this paper.
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