Spotted Frog (Rana pretiosa) Surveys in the Puget trough of Washington, 1989-1991

McAllister, Kelly; Leonard, William P.; Storm, Robert M.

doi:10.2307/3536575

Cited by 29 publications

(17 citation statements)

References 7 publications

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“…Localized declines have been noted in all ranid species in the western United States ( Corn & Fogleman 1984; Hayes & Jennings 1986; Bradford 1991; Fellers & Drost 1993; Bradford et al 1994 a , 1994 b ; Drost & Fellers 1996), including the three western U.S. species in our experiment: R. pretiosa ( U.S. Fish and Wildlife Service 1993; McAllister et al 1994), R. aurora draytonii ( U.S. Fish and Wildlife Service 1996), and R. boylii ( Corn 1994).…”

Section: Discussionmentioning

confidence: 62%

“…A growing body of evidence suggests that a number of amphibian populations have declined in recent years ( Barinaga 1990;Blaustein & Wake 1990;Wake 1998). The cause of these declines has been difficult to establish because in some instances only a single species is declining whereas sympatric species are thriving (e.g., McAllister et al 1994). Similar variation can also be observed within a single species at the population level: there are often instances when some populations of a particular species are declining and others remain unaffected (e.g., Rana pipiens [Corn & Fogleman 1984], Rana muscosa [Bradford 1991]).…”

Section: Introductionmentioning

confidence: 99%

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Variation in Pesticide Tolerance of Tadpoles among and within Species of Ranidae and Patterns of Amphibian Decline

Bridges

Semlitsch

2000

Conservation Biology

200

143

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There is significant variation among and within amphibian species with respect to reports of population decline; declining species are often found in environments that are physiograpically similar to environments where the same species is thriving. Because variability exists among organisms in their sensitivity to environmental stressors, it is important to determine the degree of this variation when undertaking conservation efforts. We conducted both lethal (time‐to‐death) and sublethal (activity change) assays to determine the degree of variation in the sensitivity of tadpoles to a pesticide, carbaryl, at three hierarchical levels: among ranid species, among several populations of a single ranid species ( Rana sphenocephala), and within populations of R. sphenocephala. We observed significant variation in time to death among the nine ranid species and among the 10 R. sphenocephala populations we tested. Four out of eight R. sphenocephala populations exhibited significantly different times to death among families. The magnitude of the activity change in response to exposure to sublethal carbaryl levels was significantly different among species and within R. sphenocephala populations. Chemical contamination, at lethal or sublethal levels, can alter natural regulatory processes such as juvenile recruitment in amphibian populations and should be considered a contributing cause of declines in amphibian populations.

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Section: Discussionmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Variation in Pesticide Tolerance of Tadpoles among and within Species of Ranidae and Patterns of Amphibian Decline

Bridges

Semlitsch

2000

Conservation Biology

200

143

View full text Add to dashboard Cite

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“…In the Great Basin, however, the probability of a D value as large as observed by chance was only 0.086 (calculated by subtracting the P-value shown in Table 2 which is the probability of a D value as small as observed by chance from one). Even though not statistically significant, these positive Tajima's D values are of concern given that field surveys have shown severe declines both in Great Basin R. luteiventris (Reaser, 1997) and R. pretiosa (Hayes et al, 1997;McAllister et al, 1993). Testing for bottlenecks with nuclear markers, larger sample sizes, and more sophisticated bottleneck tests (e.g., program Bottleneck; Piry et al, 1999) will provide a better understanding of the severity and significance of bottlenecks in these clades.…”

Section: Population Expansion and Declinesmentioning

confidence: 96%

“…Surveys of historically occupied sites indicate that R. pretiosa is extirpated from 70% to 90% of its historic range (Hayes et al, 1997;McAllister et al, 1993), and most remaining populations are small, geographically isolated, or restricted to high elevation sites (Hayes et al, 1997;C. A. Pearl, unpublished data).…”

Section: Introductionmentioning

confidence: 99%

Range-wide phylogeographic analysis of the spotted frog complex (Rana luteiventris and Rana pretiosa) in northwestern North America

Funk

Pearl

Draheim

et al. 2008

Molecular Phylogenetics and Evolution

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“…pretiosa currently occupies only 10-30% of its original range (Hayes 1997;McAllister et al 1993), which historically spanned northeastern California, western and central Oregon and Washington in the United States, and southern British Columbia in Canada (Stebbins 2003). The species is believed to be now extinct in California and western Oregon, and it persists in only a few scattered locales in Washington, and British Columbia (Fig.…”

Section: Introductionmentioning

confidence: 99%

Population structure and conservation genetics of the Oregon spotted frog, Rana pretiosa

2010

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The Oregon spotted frog (Rana pretiosa) is one of the most threatened amphibians in the Pacific Northwest.Here we analyzed data from 13 microsatellite loci and 298 bp of mitochondrial DNA in frogs collected from 23 of the remaining R. pretiosa populations in order to (1) assess levels of genetic diversity within populations of R. pretiosa, (2) identify the major genetic groups in the species, (3) estimate levels of genetic differentiation and gene flow among populations within each major group, and (4) compare the pattern of differentiation among R. pretiosa populations with that among populations of R. cascadae, a non-endangered congener that also occurs in Oregon and Washington. There is a strong, hierarchical genetic structure in R. pretiosa. That structure includes six major genetic groups, one of which is represented by a single remaining population. R. pretiosa populations have low genetic diversity (average H e = 0.31) compared to R. cascadae (average H e = 0.54) and to other ranid frogs. Genetic subdivision among populations is much higher in R. pretiosa than in R. cascadae, particularly over the largest geographic distances (hundreds of kilometers). A joint analysis of migration rates among populations and of effective sizes within populations (using MIGRATE) suggests that both species have extremely low migration rates, and that R. pretiosa have slightly smaller effective sizes. However, the slight difference in effective sizes between species appears insufficient to explain the large difference in genetic diversity and in large-scale genetic structure. We therefore hypothesize that low connectivity among the more widely-spaced R. pretiosa populations (owing to their patchier habitat), is the main cause of their lower genetic diversity and higher among-population differentiation. Conservation recommendations for R. pretiosa include maintaining habitat connectivity to facilitate gene flow among populations that are still potentially connected, and either expanding habitat or founding additional 'backup' populations to maintain diversity in the isolated populations. We recommend that special consideration be given to conservation of the Camas Prairie population in Northern Oregon. It is the most geographically isolated population, has the lowest genetic diversity (H e = 0.14) and appears to be the only remaining representative of a major genetic group that is now almost extinct. Finally, because the six major groups within R. pretiosa are strongly differentiated, occupy different habitat types, and are geographically separate, they should be recognized as evolutionarily significant units for purposes of conservation planning.

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Spotted Frog (Rana pretiosa) Surveys in the Puget trough of Washington, 1989-1991

Cited by 29 publications

References 7 publications

Variation in Pesticide Tolerance of Tadpoles among and within Species of Ranidae and Patterns of Amphibian Decline

Variation in Pesticide Tolerance of Tadpoles among and within Species of Ranidae and Patterns of Amphibian Decline

Range-wide phylogeographic analysis of the spotted frog complex (Rana luteiventris and Rana pretiosa) in northwestern North America

Population structure and conservation genetics of the Oregon spotted frog, Rana pretiosa

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