Life history modelling reveals trends in fitness and apparent survival of an isolated Salamandra salamandra population in an urbanised landscape

Kiss, István; Hamer, Andrew J.; Vörös, Judit

doi:10.1007/s10344-021-01521-2

Cited by 7 publications

(14 citation statements)

References 49 publications

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“…Given the potential longevity of S . salamandra within this population (>20 years) (Kiss et al., 2021), the scale of movement observed during this study may, therefore, be an underestimate of the true dispersal capabilities of this species in the study area and in the surrounding forest patch.…”

Section: Methodsmentioning

confidence: 72%

“…Accordingly, the probability of apparent survival of adult S . salamandra is relatively high in the study area (0.7–0.8; Kiss et al., 2021), which is likely a consequence of low emigration rates. We found that mean movement distances were smaller in forested habitats relatively close to the stream, implying that preferred microhabitats and microclimate within small forest patches might encourage site fidelity.…”

Section: Discussionmentioning

confidence: 87%

“…The probability of survival increases with better body condition among S . salamandra in the study area (Kiss et al., 2021), which infers that local habitat conditions (e.g. prey availability) may be important determinants of population dynamics.…”

Section: Discussionmentioning

confidence: 95%

“…Comparatively, small habitat patches are capable of supporting relatively large populations of S . salamandra —for example, we estimated a mean superpopulation size of 1854 adults in the study area (Kiss et al., 2021), which may be large enough to counteract the depletion of genetic variability within the local population and deter inbreeding depression. Nonetheless, the population size should continue to be monitored because any declines in this isolated population could have deleterious genetic consequences.…”

Section: Conservation Implicationsmentioning

confidence: 99%

“…As such, the potential for dispersal between these two local populations is very low. We conducted a 6‐year capture–recapture study on this local population and previously documented aspects of life history and demography (Kiss et al., 2021). The forest patch is estimated to support approximately 1854 adults, with relatively high apparent survival probabilities of adults (annual estimates of 70%–80%) that are positively related with individual body condition, and a stable population structure characterised by juvenile recruitment and adult longevity (Kiss et al., 2021).…”

Section: Introductionmentioning

confidence: 99%

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Movement patterns within an urban population of fire salamanders highlight the importance of conserving small habitat patches

2021

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Movement is an ecological process that affects individual fitness and population dynamics of species. Understanding movement patterns is crucial for the effective conservation of amphibian populations isolated by urban development. Here, we conducted a capture-recapture study over 6 years in a population of the fire salamander (Salamandra salamandra) inhabiting a 7.3-ha patch of forest and disturbed land-use types in an urbanised catchment north-west of Budapest, Hungary. We investigated relationships between movement distances and environmental, spatial and demographic parameters in order to understand how this species is able to persist in a relatively small and isolated habitat patch. We found that most movement was aggregated around a permanent stream and that movement distances were generally ≤200 m, with maximum distances of 925 and 707 m for males and females, respectively. Movement patterns within the population were best modelled using a negative exponential function characterised by infrequent long-distance movement. Males had substantially larger home range sizes than females and were predicted to have larger movement distances. Mean movement distances were predicted to be larger in disturbed areas in the upper stream catchment which included residential areas, compared with smaller movements in more natural forest near the stream. There was a positive relationship between mean movement distance and body condition. Our results suggest that this local population persists in a relatively small habitat patch because it provides a stable breeding site and suitable foraging and shelter microhabitats. Conservation of the local population requires protection of the structure, connectivity and quality of forest and stream habitats, and preventing urban development in the surrounding catchment.

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Section: Methodsmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 95%

Section: Conservation Implicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Movement patterns within an urban population of fire salamanders highlight the importance of conserving small habitat patches

2021

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Abundance and effect of health status on apparent survival of Guiana dolphins,Sotalia guianensis, in an open embayment in north‐eastern Brazil

Meirelles

Choi‐Lima²,

Nova³

et al. 2022

Aquatic Conservation

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1. Guiana dolphins (Sotalia guianensis) inhabit shallow waters of the tropical western Atlantic, an area that is now mostly occupied by cities and harbours. Demographic studies have been concentrated in sheltered areas of south/south-eastern Brazil.2. This study investigated site fidelity and estimated population abundance and apparent survival of Guiana dolphins in Mucuripe Embayment (ME), on the northeastern Brazilian coast, through photo-identification surveys and closed and open population mark-recapture models, from October 2009 to September 2011.3. Forty-six Guiana dolphin groups were recorded (in groups of between one and eight dolphins, with a mean ± SD of 3.49 ± 2.33) in 27 out of 40 surveys. Twentyfive animals were photo-identified, with eight considered to have a 'poor health' status. The standardized site fidelity index (SSFI) was low (0.25).4. Using the program CAPTURE, the time and heterogeneity model (M th ) resulted in a total abundance estimate of 39, with a Coefficient of Variation (CV) of 21% (95% CI 35-80%). In PROGRAM MARK, model averaging resulted in a total abundance estimate of 33 (CV 32%, 95% CI 30-100%). Using a CV of 21%, the power to detect a decline of 50% during the study period was 0.44 and the power to detect a decline of 5% a year was 0.11. To detect these declines with a 0.90 power, 12 years of monitoring would be necessary.5. The annual adult apparent survival rate was low (0.71; CV 19%; 95% CI 0.40-0.90), and differed for dolphins in 'good' (0.64; CV 28%, 95% CI 0.27-0.89) and 'poor' (0.85; CV 22%; 95% CI: 0.23-0.99) health.6. The low abundance of Guiana dolphins in ME indicates that conservation actions should start immediately, such as creating a marine protected area, continuing awareness campaigns, using by-catch reduction technologies, developing new regulations, and promoting law enforcement. Monitoring studies must continue with increased effort to reduce uncertainty in estimates and to improve the power to detect trends of decline.

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Sexual dimorphism in the dorsal spot number and yellow surface in fire salamandersSalamandra salamandra ssp terrestrisLinnaeus, 1758 (Caudata: Salamandridae)

Bozon,

Marteau

2024

Preprint

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Sexual selection among amphibians is mainly based on size and colour dimorphism. Those criteria are less studied in salamanders. Only morphometric and yellow surface differences between males and females are known. We studied a Salamandra salamandra terrestris population and observed significant differences in spots number and yellow surface area between males and females. Females have on average more spots and are blacker than males on their back.

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Life history modelling reveals trends in fitness and apparent survival of an isolated Salamandra salamandra population in an urbanised landscape

Cited by 7 publications

References 49 publications

Movement patterns within an urban population of fire salamanders highlight the importance of conserving small habitat patches

Movement patterns within an urban population of fire salamanders highlight the importance of conserving small habitat patches

Abundance and effect of health status on apparent survival of Guiana dolphins,Sotalia guianensis, in an open embayment in north‐eastern Brazil

Sexual dimorphism in the dorsal spot number and yellow surface in fire salamandersSalamandra salamandra ssp terrestrisLinnaeus, 1758 (Caudata: Salamandridae)

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