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Book STATUS OF FOOTHILL YELLOW LEGGED FROG RANA BOYLII IN OREGON U S DEPARTMENT OF THE INTERIOR APRIL 15 1999

Download or read book STATUS OF FOOTHILL YELLOW LEGGED FROG RANA BOYLII IN OREGON U S DEPARTMENT OF THE INTERIOR APRIL 15 1999 written by U.S. Fish and Wildlife Service and published by . This book was released on 1999* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Status of the Foothill Yellow legged Frog Rana Boylii in Oregon

Download or read book Status of the Foothill Yellow legged Frog Rana Boylii in Oregon written by Aaron Nicholas Borisenko and published by . This book was released on 1999 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Reintroduction of a Declining Amphibian

Download or read book Reintroduction of a Declining Amphibian written by Amy Jo Lind and published by . This book was released on 2005 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Plumas National Forest N F Public Motorized Travel Management

Download or read book Plumas National Forest N F Public Motorized Travel Management written by and published by . This book was released on 2010 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Responses of Foothill Yellow legged Frog Rana Boylii Larvae to an Introduced Predator

Download or read book Responses of Foothill Yellow legged Frog Rana Boylii Larvae to an Introduced Predator written by David J. Paoletti and published by . This book was released on 2010 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: The consequences of species introductions into non-native habitats are a major cause of concern in the U.S. An introduced species may alter native habitats, cause economic damage, compete with natives for resources or prey on them. Of particular interest are the effects of predation by introduced fishes on native amphibians. Amphibians as a group have been declining worldwide due to a variety of factors, one of which being introduced species. In the Pacific Northwest of the U.S., one example of these declining amphibians is the foothill yellow-legged frog (Rana boylii). In Oregon, R. boylii has disappeared from more than half of its historical sites and is now listed as a state and federal Sensitive Species. Although specific causes have not been determined, declines may be partly attributed to the recent introduction of smallmouth bass (Micropterus dolomieu) to some of the river systems in which these frogs live. Although smallmouth bass have been implicated as a cause of losses, very little is known about interactions between these two species. Given the relatively short period of time these two species have been co-existing, we sought to determine whether R. boylii larvae could even recognize bass as a predatory threat. Through a series of experiments, we examined the behavioral responses of larvae to a variety of stimuli including a native potential predator (rough-skinned newt, Taricha granulosa), introduced predator (smallmouth bass, M. dolomieu), and a native non-predatory fish (speckled dace, Rhinichthys osculus). Each experiment examined a different potential mode of detection: 1) chemical cues only; 2) visual cues only; or 3) a combination of chemical/visual/mechanical cues simultaneously. We predicted that in each experiment, larvae would respond to the native predator by exhibiting antipredator behaviors, whereas those exposed to cues of the non-native, unfamiliar predator would display activity levels similar to larvae exposed to controls. In addition, we tested amphibian larvae from two populations - one where they co-occur with M. dolomieu, and compared them to larvae from a location where M. dolomieu has not yet invaded - to determine whether any antipredator responses observed were recently developed behavioral adaptations. We analyzed initial and overall responses to stimuli. Our analyses of the initial responses of R. boylii larvae revealed an increase in activity when exposed to the visual cues of bass relative to controls. Furthermore, our results suggested that individual R. boylii larvae require multiple cues to facilitate predator detection. When exposed to multiple cues of their native predator, the rough-skinned newt, larvae responded with a significant reduction in activity levels. Those larvae exposed to cues of the non-native predator, smallmouth bass, displayed similar behaviors relative to control cues, supporting our prediction. Consequently, foothill yellow-legged frog larvae appear to be especially vulnerable to predation by non-native smallmouth bass.

Book Foothill Yellow legged Frog Distribution and Status 1999

Download or read book Foothill Yellow legged Frog Distribution and Status 1999 written by Mark R. Jennings and published by . This book was released on 1999 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Identifying Microclimatic and Water Flow Triggers Associated with Breeding Activities of a Foothill Yellow legged Frog Rana Boylii Population on the North Fork Feather River California

Download or read book Identifying Microclimatic and Water Flow Triggers Associated with Breeding Activities of a Foothill Yellow legged Frog Rana Boylii Population on the North Fork Feather River California written by and published by . This book was released on 2008 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Spatial Ecology of an Inland Population of the Foothill Yellow legged Frog Rana Boylii in Tehama County California

Download or read book Spatial Ecology of an Inland Population of the Foothill Yellow legged Frog Rana Boylii in Tehama County California written by Ryan M. Bourque and published by . This book was released on 2008 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Selected Life history and Ecological Aspects of a Population of Foothill Yellow legged Frogs Rana Boylii from Clear Creek Nevada County California

Download or read book Selected Life history and Ecological Aspects of a Population of Foothill Yellow legged Frogs Rana Boylii from Clear Creek Nevada County California written by Thomas James Van Wagner and published by . This book was released on 1996 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Identification of Foothill Yellow legged Frog Individuals Through Automated Pattern Recognition

Download or read book Identification of Foothill Yellow legged Frog Individuals Through Automated Pattern Recognition written by Orion Kemp Leland and published by . This book was released on 2014 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photographic identification of individuals using natural physical markings provides important information for studying wildlife population demographics. The Foothill Yellow-legged Frog (Rana boylii, FYLF) is a species with unique chin-spot patterns that researchers currently identify through manual comparison of photographs in search of matching markings. However, these commonly employed methods, which can involve manually comparing many hundreds of images, are both time consuming and potentially inaccurate. In this project, we address this problem by defining a process that automates the identification of FYLF individuals from images using MATLAB-based image processing and pattern recognition techniques. We tested the process using replica frogs with patterns based on actual FYLF chin-spot patterns. This method effectively found matches in frogs when the individual spots had complex shapes. However, the process less effectively recognized patterns that were based primarily on spot location. This project provides several valuable tools researchers can use to identify FYLF individuals and can be the foundation for a more optimal system.

Book Short term Occupancy and Abundance Dynamics of the Oregon Spotted Frog Rana Pretiosa Across Its Core Range

Download or read book Short term Occupancy and Abundance Dynamics of the Oregon Spotted Frog Rana Pretiosa Across Its Core Range written by and published by . This book was released on 2014 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Oregon spotted frog (Rana pretiosa) occupies only a fraction of its original range and is listed as Threatened under the Endangered Species Act. We surveyed 93 sites in a rotating frame design (2010-13) in the Klamath and Deschutes Basins, Oregon, which encompass most of the species' core extant range. Oregon spotted frogs are declining in abundance and probability of site occupancy. We did not find an association between the probability that Oregon spotted frogs disappear from a site (local extinction) and any of the variables hypothesized to affect Oregon spotted frog occupancy. This 4-year study provides baseline data, but the 4-year period was too short to draw firm conclusions. Further study is essential to understand how habitat changes and management practices relate to the status and trends of this species.