The Ecology Of Desert Bighorn Sheep Ovis Canadensis In The Peninsular Ranges Of California
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The Ecology Of Desert Bighorn Sheep Ovis Canadensis In The Peninsular Ranges Of California
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Author : Esther Salzmann Rubin
language : en
Publisher:
Release Date : 2000
The Ecology Of Desert Bighorn Sheep Ovis Canadensis In The Peninsular Ranges Of California written by Esther Salzmann Rubin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
Recovery Plan For Bighorn Sheep In The Peninsular Ranges California
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Author : Esther Rubin
language : en
Publisher:
Release Date : 2000
Recovery Plan For Bighorn Sheep In The Peninsular Ranges California written by Esther Rubin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Bighorn sheep categories.
Aspects Of The Ecology Of Peninsular Desert Bighorn Sheep Ovis Canadensis Cremnobates In Carrizo Canyon California
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Author : Stanley Charles Cunningham
language : en
Publisher:
Release Date : 1982
Aspects Of The Ecology Of Peninsular Desert Bighorn Sheep Ovis Canadensis Cremnobates In Carrizo Canyon California written by Stanley Charles Cunningham and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Animal ecology categories.
Recovery Plan For Bighorn Sheep In The Peninsular Ranges California
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Author : Esther Rubin
language : en
Publisher:
Release Date : 2000
Recovery Plan For Bighorn Sheep In The Peninsular Ranges California written by Esther Rubin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Bighorn sheep categories.
Ecology Behavior And Population Dynamics Of Desert Bighorn Sheep Ovis Canadensis Nelsoni In The San Gabriel Mountains Of California
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Author : James R. De Forge
language : en
Publisher:
Release Date : 1980
Ecology Behavior And Population Dynamics Of Desert Bighorn Sheep Ovis Canadensis Nelsoni In The San Gabriel Mountains Of California written by James R. De Forge and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Bighorn sheep categories.
Conservation And Spatial Use Analyses For The Recovery Of Bighorn Sheep In The Peninsular Ranges
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Author : Stacey D. Ostermann
language : en
Publisher:
Release Date : 2001
Conservation And Spatial Use Analyses For The Recovery Of Bighorn Sheep In The Peninsular Ranges written by Stacey D. Ostermann and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Bighorn sheep categories.
The status of wild sheep in North America typifies the plight of many wildlife species in modern times: wild sheep have declined to 10-40% of their numbers during pristine times and on a global scale approximately 31% of Caprine are considered threatened or critical. As human populations and the number of threatened and endangered wildlife species increase, research into the causes of wildlife population declines and tools to aid recovery are urgently needed. We conducted two studies of endangered desert bighorn sheep (Ovis canadensis nelsoni) in the Peninsular Ranges of Southern California with the primary goal of furthering recovery efforts for this species. First, in order to evaluate a captive breeding program for Peninsular bighorn, we developed the following criteria to provide a standard means of evaluating ongoing captive breeding and reintroduction programs: (1) survival and recruitment rates in the captive population, (2) survival of released animals, (3) recruitment of released animals, (4) growth rate of the reintroduced or augmented population, and (5) establishment of a viable wild population. In assessing the Peninsular bighorn sheep program, we found that while reintroduction did not result in population growth or establishment of a viable population, it helped prevent extirpation of the reinforced deme, preserved metapopulation linkage, and aided habitat preservation. Chronic low recruitment and low adult survivorship precluded achievement of criteria 3-5. Environmental conditions in the release area also appeared to hinder program success. We suggest that periodic evaluations are useful for improving the success of individual captive breeding and reintroduction programs, as well as for meta-analyses needed to refine reintroduction science as a recovery tool for threatened or endangered populations. Wildlife habituated to the presence of humans have been recognized as a new dilemma facing wildlife managers. Our second study involved examining the habitat use, home range size, and nutritional levels of Peninsular desert bighorn sheep along an urbanwildland interface during two time periods (1981-82 and 1995-98). We found that bighorn sheep monitored during 1995-98 used habitat within (P
Desert Bighorn Sheep
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Author : Norman S. Smith
language : en
Publisher:
Release Date : 1988
Desert Bighorn Sheep written by Norman S. Smith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Bighorn sheep categories.
Endangered And Threatened Wildlife And Plants Designation Of Critical Habitat For Peninsular Bighorn Sheep Us Fish And Wildlife Service Regulation Fws 2018 Edition
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Author : The Law The Law Library
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-10-24
Endangered And Threatened Wildlife And Plants Designation Of Critical Habitat For Peninsular Bighorn Sheep Us Fish And Wildlife Service Regulation Fws 2018 Edition written by The Law The Law Library and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-24 with categories.
Endangered and Threatened Wildlife and Plants - Designation of Critical Habitat for Peninsular Bighorn Sheep (US Fish and Wildlife Service Regulation) (FWS) (2018 Edition) The Law Library presents the complete text of the Endangered and Threatened Wildlife and Plants - Designation of Critical Habitat for Peninsular Bighorn Sheep (US Fish and Wildlife Service Regulation) (FWS) (2018 Edition). Updated as of May 29, 2018 We, the U.S. Fish and Wildlife Service (Service), designate revised critical habitat for the Peninsular bighorn sheep, a distinct population segment (DPS) of desert bighorn sheep (Ovis canadensis nelsoni) occupying the Peninsular Ranges of Southern California, under the Endangered Species Act of 1973, as amended (Act). In total, approximately 376,938 acres (ac) (152,542 hectares (ha)) fall within the boundaries of the critical habitat designation. This revised designation of critical habitat for Peninsular bighorn sheep reduces the 2001 designation by approximately 467,959 ac (189,377 ha). The revised critical habitat is located in Riverside, San Diego, and Imperial Counties, California. This book contains: - The complete text of the Endangered and Threatened Wildlife and Plants - Designation of Critical Habitat for Peninsular Bighorn Sheep (US Fish and Wildlife Service Regulation) (FWS) (2018 Edition) - A table of contents with the page number of each section
Pumas Of The Peninsular Ranges
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Author : Sean Clemenza
language : en
Publisher:
Release Date : 2016
Pumas Of The Peninsular Ranges written by Sean Clemenza and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
By the early 2000s, desert bighorn sheep (Ovis canadensis) populations in the southern California had declined significantly. These declines progressed to the point that bighorn sheep in the Peninsular Ranges population were listed as federally endangered in 1998 and these sheep became a California “Fully Protected Mammal” species (US Fish and Wildlife Service 1998, California Fish and Game 2016). Initially, high lamb mortality and low recruitment were thought to be responsible for the declines, however the most frequent cause of sheep mortality turned out to be predation by pumas (Puma concolor). In a local study, pumas were found to be the cause of death for 69% of all mortalities (Hayes et al. 2000). Predation at these levels could potentially impact population viability and persistence of bighorn sheep (Festa-Bianchet et al. 2006). Additionally as many bighorn sheep had been marked (e.g. collars and ear tags) for study and conservation, concerns were expressed over whether or not the marking made sheep more “conspicuous” and thus susceptible to predation (Rominger and Weisenberger 2000). During the course of investigating the possible impacts of marking bighorn sheep, I observed a unique regionally variable behavior of pumas, which is little studied and poorly understood. The behavior was that of pumas apparently abandoning kills temporarily to use remote day beds >2 km away. After remaining at day beds, pumas returned to feed at kill sites before repeating a similar process the next day. In order to better study the unique behavior, a new method was developed to detect remote day bed use. The new method is more widely applicable than to just puma behavior and has implications for central-place foraging analyses. Given utility of the new method in optimal foraging approaches, I examined optimality of puma foraging in a manner not done before. I compared my observations to predictions of the Marginal Value Theorem (Charnov 1976). My primary research objectives were to (1) test for differential selection in pumas preying on radio-collared versus uncollared bighorn sheep, (2) examine puma movement and behavior at and around kill sites, (3) develop a method to identify and examine puma kills in a way that allows central-place behaviors and specifically day bed use to be considered, (4) test predictions of the Marginal Value Theorem (MVT) for pumas and prey. As I described in chapter 1 (formatted for BioMed Central Research Notes) during biennial helicopter surveys from 2000-2004 in southern California, the total number of bighorn sheep in 5 of 8 recognized subpopulations of the Peninsular Ranges (Rubin et al. 1998) were estimated. The number of marked (radio-collared) bighorn sheep was subtracted from the total population to determine the number unmarked (uncollared). I used Global Positioning System (GPS) locations from pumas radio-collared between 2002-2004 to identify kills of pumas preying upon these bighorn sheep. Three pumas killed 23 bighorn sheep (19 uncollared and 4 radio-collared) over the course of the study. Pumas did not preferentially prey on marked versus unmarked bighorn sheep. Predation occurred primarily during crepuscular and nighttime hours, and 22 kill sites were identified by the occurrence of 2 or more consecutive puma GPS locations (a cluster) within 200 m of each other at 1900, 0000, and 0600 h. I tested the "conspicuous individual hypothesis" and found that there was no difference in puma predation upon radio- collared or uncollared bighorn sheep. Pumas tended to move long distances before and after kills, but their movement patterns immediately post-kill were much more restricted. Researchers can exploit this behavior to identify puma kill sites and investigate prey selection by designing studies, which detect puma locations spatially clustered between dusk and dawn. I developed a new method discussed in chapter 2 (formatted for the Journal of Wildlife Management), the first to account for day bed use behavior in pumas, which is widely applicable and can be used to identify central-place uses and behaviors away from central-places for a broad spectrum of taxa using location data. I developed the method to detect central-place use via GPS location clusters. Specifically, the method was designed to detect behaviors at clusters, such as remote day bed use. The method was validated and tested for puma kill/cache detection. This study is the first to account for the observed behavior during puma feeding of departing from and returning to caches. In the course of this study, I also documented the first long-term reuse of caches by pumas; and detected sex-based effects in foraging behavior. Overall, this study provided a unique approach to examine GPS location clusters in a way, which allows for analysis of central-place behaviors like day bed use. My results demonstrate that investing in new approaches to analysis can yield insight into regionally variable and difficult to observe behaviors, which is valuable to wildlife management. As described in chapter 3 (formatted for the Journal of Wildlife Management), optimal foraging is a key tenet of ecology and fundamental to our understanding of predator-prey interactions. The classical marginal value theorem (MVT) uses travel time between patches and patch quality to determine optimal patch residence time. While the MVT has been successfully tested in controlled laboratory environments, it has been insufficiently evaluated under natural conditions such as terrestrial predator and multi-prey systems. Using novel analytical techniques and data from long-term studies of pumas (Puma concolor), I found qualitative support for 2 of 3 MVT predictions tested. I found time spent at caches increased with increasing average foodivvalue (habitat quality) of caches. Time spent at caches also increased significantly for higher food value (quality) caches than lower food value caches. During my examination, I also detected sex-based effects in patch quality on foraging behavior. Overall, this study provided a unique approach to examine the MVT in the context of a complex natural predator-prey system. It also improved our understanding of behavior and highlighted some important new differences between sexes in pumas, which could convey both impacts to prey and benefits to scavengers. My results demonstrate that leveraging technological advances, such as in puma cache detection, with novel theoretical applications of field observations drives new understanding of cryptic behaviors such as those of ambush predators like pumas and is valuable to long-term and large- scale management.
Using Neighborhood Effects And Friction Surfaces To Model Spatial Distributions And Movement Areas
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Author : Jennifer Lee Rechel
language : en
Publisher:
Release Date : 2003
Using Neighborhood Effects And Friction Surfaces To Model Spatial Distributions And Movement Areas written by Jennifer Lee Rechel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Bighorn sheep categories.