Dissertation/Thesis Abstract

Movements, habitat use, and demography of Western Pond Turtles in an intermittent central California stream
by Belli, Joseph P., M.S., San Jose State University, 2016, 110; 10011666
Abstract (Summary)

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).

Indexing (document details)
Advisor: Smith, Jerry J.
Commitee: Messina, Paula, Smith, Jerry J., Trewhitt, Stephanie
School: San Jose State University
Department: Biological Sciences
School Location: United States -- California
Source: MAI 55/03M(E), Masters Abstracts International
Source Type: DISSERTATION
Subjects: Ecology, Conservation
Keywords: Actinemys marmorata, California, Emys marmorata, Habitat use, Intermittent stream, Western pond turtles
Publication Number: 10011666
ISBN: 9781339474694
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