Foothill Yellow-legged Frog Conservation Assessment in California PDF Download
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Author:
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Category : Foothill yellow-legged frog
Languages : en
Pages : 193
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Author:
Publisher:
ISBN:
Category : Foothill yellow-legged frog
Languages : en
Pages : 193
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Author: Deanna H. Olson
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Category : Foothill yellow-legged frog
Languages : en
Pages : 62
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Author: Ryan M. Bourque
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Category : Foothill yellow-legged frog
Languages : en
Pages : 186
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Author: Amy Jo Lind
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Category :
Languages : en
Pages : 372
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Category :
Languages : en
Pages : 60
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The mountain yellow-legged frog (Rana muscosa) has a disjunct distribution spread between the Sierra Nevada and southern California. The southern California population of mountain yellowlegged frog (MYLF) is recognized as a distinct population segment, and with less than 200 adults remaining in the wild, is protected under the federal endangered species act. I examined multiple facets of MYLF conservation across both wild and captive populations with the goal of improving current conservation efforts for the species. To understand the microhabitat needs of the MYLF I modeled the relationship between MYLF presence and 11 microhabitat variables on a per pool scale. Logistic regression models with Akaike's Information Criteria (AIC) were created for both frog and tadpole life stages. The frog model revealed that pool volume, pool leaf litter, bank leaf litter, and understory cover were important variables associated with frog presence. The tadpole model indicated that pool depth and understory cover were important and that pH was marginally important. This knowledge of the microhabitat needs of the MYLF can improve reintroduction efforts by allowing managers to make more informed decisions about where the MYLF should be reintroduced. To improve the reproductive output of a captive colony of MYLF with a history of low reproductive success, I measured the effect of an artificial hibernation period on multiple reproductive behaviors. Males subjected to advertisement calls of conspecific males demonstrated an increased phonotaxic response after a hibernation period (P = 0.01). However, females did not demonstrate a change in phonotaxic response after hibernation (P = 0.93). Examining the reproductive behaviors of breeding pairs I found that males who were hibernated had significantly higher frequencies of amplexus (P
Author: Thomas Earl Gonsolin (Jr.)
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Category : Foothill yellow-legged frog
Languages : en
Pages : 133
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Visual encounter surveys, mark-recapture technique, and telemetry were used investigate breeding, movement, growth, habitat preferences, and predators of foothill yellow-legged frogs on Coyote Creek in Santa Clara County, California, from March 2004 to March 2006. The main stem and tributaries were intermittent in summer in all three years. Thermal conditions for breeding initiation were alike during 2004, 2005, and 2006. Breeding occurred in the main stem on descending limbs of the hydrograph. No breeding occurred in the middle main stem reach, which is ephemeral. Breeding occurred at less than an order of magnitude greater than base flows. Typically, larger females bred earlier, and egg mass size decreased as the breeding season progressed during 2004 and 2005. Males arrived earlier and remained in breeding areas longer. Resident tributary frogs moved greater distances than main stem frogs to breed. Females tended to travel farther than males and occupied habitats farther from the breeding areas. Frogs on Coyote Creek showed faster growth during their first year than Sierra Nevada and north Coast Range populations. Both sexes preferred pools and boulder-dominated habitat on both the main stem and tributary. Santa Cruz garter snakes were the most frequently encountered predator in the study area. However, all diurnal predators were scarce on the tributaries. Perennial water is a limiting factor within the study area, as illustrated by the movement patterns and timing of breeding.
Author: Thomas James Van Wagner
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Category :
Languages : en
Pages : 286
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Author: John R. Stephenson
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Category : Biodiversity conservation
Languages : en
Pages : 422
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Category : Foothill yellow-legged frog
Languages : en
Pages : 94
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Author: Adam Backlin
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Category : Amphibian surveys
Languages : en
Pages : 82
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