Movements Habitat Use And Demography Of Western Pond Turtles In An Intermittent Central California Stream
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Movements Habitat Use And Demography Of Western Pond Turtles In An Intermittent Central California Stream
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Author : Joseph Paul Belli
language : en
Publisher:
Release Date : 2015
Movements Habitat Use And Demography Of Western Pond Turtles In An Intermittent Central California Stream written by Joseph Paul Belli and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Animal populations categories.
"Western Pond Turtles, Emys (Actinemys) marmorata, were captured (n=173) in 2011 (wet year) and 2012-2013 (successively drier drought years) along upper Coyote Creek, an intermittent stream in central California. Males outnumbered females 2.8:1, juveniles less than 120 mm long made up 26% of captures, growth rates varied among individuals, and little growth occurred in turtles older than 10 years. I radio-tracked turtles from May 2011 through August 2013 to ascertain movements and seasonal habitat use. Males had much larger home ranges than females (means of 2281 m for males and 501 m for females in 2012), and males moved extensively in April and May, during the apparent breeding season. Turtles preferred deep and complex pools, complex runs, and backwaters. Turtles left the stream for upland habitats in late spring and summer as stream flow ceased and pool connectivity was broken. There was substantial variation in departure dates among individuals and between wetter and drier reaches. Mean departure date was 16 August in 2011, but decreased to 20 July in 2012 and 28 June in 2013, as the drought intensified. Upland sites were mostly within 100 m of the stream, beneath dried leaves and/or thatch, and on slopes varying from flat to over 40%. Turtles remained upland for almost seven months in 2011-2012, although there was much variation. Mean return to stream dates were 27 February (males) and 16 March (females)." -- Author's abstract.
The Movements Habitat Use And Population Assessment Of Western Pond Turtles Actinemys Marmorata In A Southern California Seasonal Wetland
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Author : Barry S. Nerhus (Jr.)
language : en
Publisher:
Release Date : 2016
The Movements Habitat Use And Population Assessment Of Western Pond Turtles Actinemys Marmorata In A Southern California Seasonal Wetland written by Barry S. Nerhus (Jr.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Pond animals categories.
Abstract: This study investigates the population dynamics, movements, and habitat use of a population of western pond turtles in Orange County, California from 2008-2012 using radio telemetry and mark-recapture data. Western pond turtles have been thought to be declining throughout their range. However, few studies have documented their status in southern California, where urbanization has changed the landscape drastically in recent decades. I individually marked 236 pond turtles using hoop-net funnel traps and estimated the population size at 308 individuals, which is the largest estimate reported in southern California. Mean capture per unit effort was 5.03±0.87. Mean female carapace length (CL) (142±14mm) was not significantly larger than males (139±14 mm). I also documented 20 nest and 9 estivation locations. Mean distances included 176 ±130.80 meters (m) and 91±58.6 m. These data identify the population demography, which can be a metric of population stability. Other known populations need to be estimated to determine their regional status.
A Comparison Of Western Pond Turtle Actinemys Marmorata Movements In Perennial And Intermittent Portions Of A Northwestern California River System
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Author : Cheryl A. Bondi
language : en
Publisher:
Release Date : 2009
A Comparison Of Western Pond Turtle Actinemys Marmorata Movements In Perennial And Intermittent Portions Of A Northwestern California River System written by Cheryl A. Bondi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Western pond turtle categories.
Population Structure Life History And Terrestrial Movements Of Western Pond Turtles Actinemys Marmorata In Lentic Habitats Along The Trinity River California
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Author : Leah Marie Sloan
language : en
Publisher:
Release Date : 2012
Population Structure Life History And Terrestrial Movements Of Western Pond Turtles Actinemys Marmorata In Lentic Habitats Along The Trinity River California written by Leah Marie Sloan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Western pond turtle categories.
The Western Pond Turtle
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Author : Dan C. Holland
language : en
Publisher:
Release Date : 1994
The Western Pond Turtle written by Dan C. Holland and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Turtles categories.
Best Management Practices For The Conservation Of Western Pond Turtle Populations In California
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Author : Cristina Yarnal
language : en
Publisher:
Release Date : 2019
Best Management Practices For The Conservation Of Western Pond Turtle Populations In California written by Cristina Yarnal and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
This project provides insight into western pond turtle (Actinemys marmorata) population health at sites in three states on the western part of the United States. Washington, Oregon and California have identified the western pond turtle as endangered, a critical and a species of special concern in that respective order. Washington has implemented a recovery plan for western pond turtles and Oregon has established best management practices for the conservation of native turtles. California has yet to establish any guidelines for the conservation of western pond turtles. This species is endemic to the western United States and has been suffering from declining populations since the late 1800s. The factors that have contributed to the decline in western pond turtle numbers include: historical commercial food use, habitat destruction and fragmentation by water diversions, urbanization and agriculture, non-native species interactions, fire, drought, and flood which are increased by climate change due to anthropogenic activity. Reptiles in general do not do well with high disturbance rates in their environment, due to their slow movements. Western pond turtles have also been afflicted by different diseases, such as a respiratory illness that decimated one-third of the population in Washington and shell disease that has been affecting populations in Washington, Oregon and California. Exposure to diseases is proliferated by contact with released pet turtles, as captive turtles contain different bacteria. The western pond turtle sites analyzed are in the Columbia Gorge and South Puget Sound in Washington, Willamette Drainage in Oregon and sites in Lake County, San Diego County and Yolo County in California. These sites were analyzed through a combination of data from peer-reviewed, unpublished literature and government agency reports. The purpose of this research is to determine the effectiveness of management plans and strategies used for the recovery and conservation of western pond turtle populations, with an emphasis on head-starting programs, non-native species removal, habitat restoration and enhancement. The results will be analyzed by looking at historical data and more recent results in relatively the same area to determine if the western pond turtle populations have increased or decreased at those sites, in order to best allocate resources and prepare management plans for the conservation of western pond turtle populations in California. The recommendations being propose are surveying and monitoring, collaboration, habitat restoration/enhancement, non-native species removal, head-start programs and land acquisition. The analysis between sites in Washington, Oregon and California showed some progress but requires further research.
Comparative Demography And Habitat Use Of Western Pond Turtles In Northern California
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Author : Devin Andrews Reese
language : en
Publisher:
Release Date : 1996
Comparative Demography And Habitat Use Of Western Pond Turtles In Northern California written by Devin Andrews Reese and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
Habitat Use And Movements Of A Blanding S Turtle Population In Central Wisconsin
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Author : David A. Ross
language : en
Publisher:
Release Date : 1985
Habitat Use And Movements Of A Blanding S Turtle Population In Central Wisconsin written by David A. Ross and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Blanding's turtle categories.
Field Guide To Amphibians And Reptiles Of California
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Author : Robert C. Stebbins
language : en
Publisher: Univ of California Press
Release Date : 2012-09-04
Field Guide To Amphibians And Reptiles Of California written by Robert C. Stebbins and has been published by Univ of California Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-09-04 with Nature categories.
". . . encourage[s] hope and resilience in times of devastating damage."—New York Review of Books This user-friendly guide is the only complete resource that identifies and describes all the amphibians and reptiles—salamanders, frogs and toads, lizards, snakes, and tortoises and turtles—that live in California. The species are described in richly detailed accounts that include range maps, lifelike color paintings by Robert C. Stebbins, clear drawings of various life stages including eggs, notes on natural history, and conservation status. Easy-to-use keys for every order help identify species, and informative chapters cover more general topics including evolution, habitat loss, and photography. Throughout, anecdotes and observations reveal new insights into the lives of California’s abundant but often hidden amphibians and reptiles.
The Leatherback Turtle
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Author : James R. Spotila
language : en
Publisher: JHU Press
Release Date : 2015-10-30
The Leatherback Turtle written by James R. Spotila and has been published by JHU Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-10-30 with Science categories.
The most comprehensive book ever written on leatherback sea turtles. Weighing as much as 2,000 pounds and reaching lengths of over seven feet, leatherback turtles are the world’s largest reptile. These unusual sea turtles have a thick, pliable shell that helps them to withstand great depths—they can swim more than one thousand meters below the surface in search of food. And what food source sustains these goliaths? Their diet consists almost exclusively of jellyfish, a meal they crisscross the oceans to find. Leatherbacks have been declining in recent decades, and some predict they will be gone by the end of this century. Why? Because of two primary factors: human redevelopment of nesting beaches and commercial fishing. There are only twenty-nine index beaches in the world where these turtles nest, and there is immense pressure to develop most of them into homes or resorts. At the same time, longline and gill net fisheries continue to overwhelm waters frequented by leatherbacks. In The Leatherback Turtle, James R. Spotila and Pilar Santidrián Tomillo bring together the world’s leading experts to produce a volume that reveals the biology of the leatherback while putting a spotlight on the conservation problems and solutions related to the species. The book leaves us with options: embark on the conservation strategy laid out within its pages and save one of nature’s most splendid creations, or watch yet another magnificent species disappear.