Introduced Bullfrogs (Rana catesbeiana) in Western Canada: Has Their Ecology Diverged?

Govindarajulu, Purnima; Price, WJ; Anholt, Bradley R.

doi:10.1670/68-05a.1

Cited by 48 publications

(63 citation statements)

References 38 publications

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“…The reproductive traits of L. catesbeianus are consistent with its classification as a generalist species (Ryan, 1980;Duellman and Trueb, 1994;Govindarajulu et al, 2006). Reproductive events are determined by both endocrine and environmental factors.…”

supporting

confidence: 68%

See 1 more Smart Citation

The Reproductive Biology of the InvasiveLithobates catesbeianus(Amphibia: Anura)

Leivas

Moura

Fávaro

2012

Journal of Herpetology

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supporting

confidence: 68%

“…Reproductive events are determined by both endocrine and environmental factors. In its original range, L. catesbeianus has a discontinuous reproductive cycle in response to environmental factors such as temperature and precipitation, thus reproducing from April to June (Ryan, 1980;Duellman and Trueb, 1994;Govindarajulu et al, 2006).…”

mentioning

confidence: 99%

The Reproductive Biology of the InvasiveLithobates catesbeianus(Amphibia: Anura)

Leivas

Moura

Fávaro

2012

Journal of Herpetology

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“…Adults, when observed in the colder months, remained in the water. These periods in North America are referred to torpor (Willis et al 1956, Howard 1981, Govindarajulu 2006. We observed bullfrogs in this state of low activity only between late May and early July, but more observations are required for its classification as torpor.…”

Section: Discussionmentioning

confidence: 87%

“…The prolonged reproductive season is characterized by male calling activity periods (Emlen 1976, Ryan 1980, Bury and Whelan 1984 and by intense movement of females for partner selection (Wiewandt 1969, Howard 1978, Ryan 1980. Spawning may occur once or twice in a given reproductive cycle (Emlen 1977, Ryan 1980, Govindarajulu et al 2006. However, few studies exist on the reproductive biology of bullfrogs in ex-situ populations in Brazil.…”

mentioning

confidence: 99%

Reproductive phenology of the American Bullfrog in subtropical Brazil: photoperiod as a main determinant of seasonal activity

Medeiros

Both

Kaefer

et al. 2016

An. Acad. Bras. Ciênc.

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The North American bullfrog Lithobates catesbeianus continues to invade ecosystems worldwide, potentially causing population declines and even extinctions. Within its native distribution, bullfrogs show prolonged reproductive seasons and high fertility. However, data on breeding biology of bullfrogs ex-situ in invaded localities mainly comes from anecdotal reports. Understanding how invasive species are adjusting their life histories to new colonized environments is important for conservation purposes. Here we describe temporal and spatial abundance, calling activity, spawning and tadpole distribution of bullfrogs in southern Brazil. Eighteen samplings occurred during one year. The abundance of individuals was positively related to longer photoperiods and higher temperatures. Reproductive activity was also positively associated with longer photoperiods. Calling sites, spawning and tadpoles were associated with microhabitats presenting hydrophytes, which may provide shelter and thermal stability to bullfrogs. The reproductive seasonal activity of bullfrogs can be highly variable across its growing geographical range, but in subtropical Brazil it is associated with photoperiod, a highly predictable abiotic determinant. In our study area, bullfrogs presented a breeding season twice as long as that observed in some native localities. We suggest that management strategies directed to bullfrog populations must consider the habitat structures and seasonal regimes determined by each invaded environment.

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“…Life-history traits in countries where it was introduced remain largely understudied. Govindarajulu et al (2006) recorded tadpole and adult growth in introduced populations in British Coumbia, but found that the seasonal pattern and growth rate of introduced bullfrogs were similar to those of lower latitude native populations in Kentucky and Missouri.…”

Section: Introductionmentioning

confidence: 98%

Age and body size in four introduced populations of the American bullfrog, Lithobates catesbeianus (Ranidae)

Tessa

Delforno

Govindarajulu

et al. 2016

Italian Journal of Zoology

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The American bullfrog, native to the eastern half of North America including southern Quebec, is considered one of the most invasive species in the world. It has been introduced in America, Asia and Europe, mainly for food purposes. A study on the age and body size of this species was carried out on individuals obtained from four introduced populations (one from Western Canada and three from France), using the skeletochronological method. Adults did not differ between sexes in mean body size or mean age, with the exception of one population in France where males were younger than females. Several differences in the mean age and body size were observed, with the individuals from the population in Canada exhibiting the highest values for both sexes. The scarcity of studies in the native range prevents the comparison of introduced versus native populations, and we focus on comparisons between introduced populations.

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Introduced Bullfrogs (Rana catesbeiana) in Western Canada: Has Their Ecology Diverged?

Cited by 48 publications

References 38 publications

The Reproductive Biology of the InvasiveLithobates catesbeianus(Amphibia: Anura)

The Reproductive Biology of the InvasiveLithobates catesbeianus(Amphibia: Anura)

Reproductive phenology of the American Bullfrog in subtropical Brazil: photoperiod as a main determinant of seasonal activity

Age and body size in four introduced populations of the American bullfrog, Lithobates catesbeianus (Ranidae)

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