Spawning migration phenology of the spadefoot toad Pelobates fuscus (Pelobatidae, Amphibia) in the valley of the Medveditsa River (Saratov oblast)

Yermokhin, M. V.; Tabachishin, V. G.; Ivanov, G. A.

doi:10.1134/s1062359015100040

Cited by 14 publications

(12 citation statements)

References 6 publications

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“…It is important to note that the rainfall during a single day (24 h period) seems more important than the rainfall summed over a month, as the latter was not included in the final model. The dependence on rainfall is known from the literature, however, in our data this dependency seems to be especially striking during summer, while their main breeding season takes place from April to May [ 31 ]. Interestingly, it has been observed that spadefoot toads occasionally have a second breeding period in the summer months, in the event of major rainfalls [ 32 ].…”

Section: Resultsmentioning

confidence: 73%

Long‐term monitoring of common spadefoot toad activity in a European steppe using barn owl pellets

Landler

Stefke

2021

J of Biol Res-Thessaloniki

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Background One third of the worldwide amphibian species are threatened, therefore, efficient monitoring efforts are needed. Amphibians which adopt a hidden lifestyle, such as the common spadefoot toad, are often missed with standard surveying efforts. Spadefoot toads can be identified in regurgitated pellets of the barn owl, which provides an effective way to estimate toad activity. In our study we analyzed frequency of spadefoot toad remains from 2004 to 2016 in a steppe landscape in eastern Austria. Methods We used an automated model selection procedure together with a GLM analysis using a zero inflated error Poisson distribution, to analyze the presence of Pelobates fuscus in barn owl pellets. All analyses were done in the statistical software R, and the scripts to reproduce our results are available within this publication. Our approach may provide a template for other researchers to use for their own pellet data. Conclusions Our analysis suggested that activity of the common spadefoot toad is mainly influenced by rainfalls, while time of the year and temperature had small but significant effects. Interestingly, our data confirmed the possibility of a second breeding period in summer, triggered by heavy rainfalls. There were no indications for a population decrease in the observed years and locations. Our study shows that barn owl pellets can be used effectivley to assess pelobatid activity in an area. This might constitute a useful monitoring tool for conservation management for amphibians.

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Section: Resultsmentioning

confidence: 73%

Long‐term monitoring of common spadefoot toad activity in a European steppe using barn owl pellets

Landler

Stefke

2021

J of Biol Res-Thessaloniki

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“…According to this indicator, the local populations of the four lakes studied by us are located in the following row in order of increasing area occupied by forest within a radius of 600 m from the water body: the adjacent lakes Kruglen'koe and Cherepashye (38.2%), lake Sadok (46.5%), and lake Koblovo (83.7%). Correlation analysis has shown that the higher the forest coverage of the area around the spawning lake, the later the onset of spawning migrations of Pelobates vespertinus (Pearson correlation coefficient: r = 0.96, P = 0.04; Yermokhin et al, 2015). On average, a 5% increase in forest coverage leads to a 1-d shift in the start date of spawning migrations (Yermokhin et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Environmental Predictors of the Onset of Spawning Migration in Pelobates vespertinus (Anura: Pelobatidae)

Yermokhin,

Tabachishin

2023

South American Journal of Herpetology

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The dates of the onset of spawning migrations of local populations of Pelobates vespertinus (the Pallas spadefoot toad) in the Medveditsa river valley (Russia, Saratov Region) were determined in 2009−2019. It was found that the minimum threshold value of the water temperature in every spawning water body corresponding to the arrival of first individuals of the species to their spawning area was 4.5℃. Moreover, according to the nearest weather station's long-term forecast of air temperature, the average daily water temperature at the spawning site was calculated, equal to the average daily air temperature over 10 d. By analyzing the dynamics of this indicator, the dates of a steady transition of water temperature through its threshold value (4.5℃) were calculated. This date was considered the predicted start date of P. vespertinus spawning migrations. Any deviation of the actual start date of spawning migrations from the predicted one did not exceed 3 d for 11 years. The lead time for predicting the actual start date of migrations is positively related to the water temperature increase rate. During the study period, the lead time of the forecast was 6−18 d (12 d on the average). Our historical reconstruction of the long-term dynamics of the water temperature increase rate from weather archives and the forecast lead time (according to a model describing their relationship) in 1892−2008 showed that these parameters had no significant intra-century trend against the background of global climate warming. Our proposed method for predicting the start date of spawning migrations can be recommended for use in planning any research on P. vespertinus populations, ecosystem processes, and species conservation measures.

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“…на территории севера Нижнего Поволжья, причем особенно заметно трансформировались фенологические особеннос-ти периода зимовки и начала нерестовых мигра-ций (Ермохин и др., 2013, , 2014Yermokhin et al, 2015).…”

Section: Introductionunclassified

Long-Term Dynamics of the Size-Weight and Sexual Structure in Populations of Pelobates Fuscus (Anura, Pelobatidae) in the Medveditsa River Valley (Saratov Region)

Yermokhin¹,

Tabachishin²,

Ivanov³

2016

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Spawning migration phenology of the spadefoot toad Pelobates fuscus (Pelobatidae, Amphibia) in the valley of the Medveditsa River (Saratov oblast)

Cited by 14 publications

References 6 publications

Long‐term monitoring of common spadefoot toad activity in a European steppe using barn owl pellets

Long‐term monitoring of common spadefoot toad activity in a European steppe using barn owl pellets

Environmental Predictors of the Onset of Spawning Migration in Pelobates vespertinus (Anura: Pelobatidae)

Long-Term Dynamics of the Size-Weight and Sexual Structure in Populations of Pelobates Fuscus (Anura, Pelobatidae) in the Medveditsa River Valley (Saratov Region)

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