Winter Observations of Tailed Frogs in Northeastern Oregon

Bull, Evelyn L.; Carter, Bernie E.

doi:10.2307/3536619

Cited by 2 publications

(2 citation statements)

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“…Alternatively, low- and mid-elevation tadpoles may grow year-round, as they do in coastal California where the climate is buffered by the ocean and there is little to no snowfall (Burkholder and Diller, 2007). Rocky Mountain Tailed Frog ( A. montanus ) tadpole growth rates were as high as 8 mm/d in the first two cohorts, whereas the third cohort grew very little (Bull and Carter, 1996). In our study, the youngest cohort of tadpoles made up most of the growth rate data.…”

Section: Discussionmentioning

confidence: 99%

Larval Life History of Coastal Tailed Frogs (Ascaphus truei) Across an Elevational Gradient in Northern California: Implications for a Changing Climate

Macedo,

Demianew,

Garwood

et al. 2023

Journal of Herpetology

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Coastal Tailed Frogs (Ascaphus truei) range across the Pacific Northwest from northern California, USA, into British Columbia, Canada, and from sea level to >2,131 m. Previous work has shown a variable larval period but has not clearly separated elevational from latitudinal effects. Therefore, we examined size at beginning of metamorphosis, larval period, individual growth rates, and timing of metamorphosis of A. truei populations along an elevational gradient from 152 to 2,131 m across a small latitudinal range (29 km) to reduce potential latitudinal effects, all within the Klamath Mountains of northern California. We sampled larvae at 15 study sites, of which we used 6 sites as intensive capture–mark–recapture (CMR) locations, and the other 9 for supplemental data on larval period and size at metamorphosis. In CMR sites, we individually marked tadpoles to determine within-season growth rates. We found that the A. truei larval period in these populations ranges from 2 yr in low and middle elevations to ‡3 yr in high-elevation populations. We also found decreased size at beginning of metamorphosis and increased growth rates of tadpoles with increasing elevation. Our high-elevation populations had the longest larval period documented in California. The associations of growth and timing of metamorphosis to elevation in A. truei populations suggest that responses to changing climate may differ across elevations.

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Section: Discussionmentioning

confidence: 99%

Larval Life History of Coastal Tailed Frogs (Ascaphus truei) Across an Elevational Gradient in Northern California: Implications for a Changing Climate

Macedo,

Demianew,

Garwood

et al. 2023

Journal of Herpetology

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“…Communication through sound being difficult when copulexus happens while males and females are crawling along the bottom of a stream (side note: tailed frogs do not frog kick, an interesting thing for a frog not to do). She is unaware of the creativity humans have used to describe intromission in her species (Noble and Putnam, 1931;Metter, 1964;Bull and Carter, 1996;Stephenson and Verrell, 2003).…”

Section: The Frogmentioning

confidence: 99%

Curious case of the coastal tailed frog (ascaphus truei) near the northern extent of its range

Mosher¹

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Ascaphus truei, an ancient species of frog, migrated into British Columbia, Canada, following the last ice age. A. truei is of conservation interest because forestry practices, and the associated infrastructure, may reduce habitat quality. There is also concern that a warmer and drier climate will change the distribution and abundance of this species. I used two genetic methods, microsatellites and next-generation sequencing, to compare the genetic diversity of A. truei from the northern extent of its range in British Columbia, CA to southern Washington, USA. Both methods suggested a dramatic reduction in diversity across the northern portion of the species’ range. The phylogeography suggests a northern range expansion from a single refugium. I used DNA metabarcoding to compare the gut contents of larvae across three stream reaches and two development classes near the northern extent of A. truei's range. Gut contents differed between stream reach but did not differ among development class. Wetted width and ultimately stream volume may influence differences in gut content among stream reaches. I also quantified the relationship between an index of larvae density and environmental factors hypothesized to influence population density near the northern extent of the range. I assessed the segregation of larvae at various developmental stages. Wetted width and wetted depth correlated with differences in the abundance of larvae. Older developmental stages were captured in stream reaches with greater slopes than younger stages. Management should minimize modifications of stream structure, such as in-stream siltation due to road building. We should maintain habitat connectivity and gene flow to ensure the continued migration and adaptive capacity of A. truei.

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Winter Observations of Tailed Frogs in Northeastern Oregon

Cited by 2 publications

References 0 publications

Larval Life History of Coastal Tailed Frogs (Ascaphus truei) Across an Elevational Gradient in Northern California: Implications for a Changing Climate

Larval Life History of Coastal Tailed Frogs (Ascaphus truei) Across an Elevational Gradient in Northern California: Implications for a Changing Climate

Curious case of the coastal tailed frog (ascaphus truei) near the northern extent of its range

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