Postbreeding Movements in Marbled Newts (Caudata, Salamandridae): A Comparative Radiotracking Study in Two Habitat Types

Trochet, Audrey; Chevalier, Hugo Le; Calvez, Olivier; Barthe, Laurent; Isselin-Nondedeu, Françis; Picard, Damien; Debelgarric, Mélanie; Pégourié, Ninon; Rocher, Rozenn; Ribéron, Alexandre

doi:10.1655/herpetologica-d-15-00072

Cited by 17 publications

(24 citation statements)

References 73 publications

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“…Therefore, it would be worth to test whether dispersal distances are inversely proportional to the probability to disperse (see also Scott et al 2013). Moreover, identifying whether males and females differ in their likelihood to move over short versus long distances and if these movements are connected with habitat features remain an interesting perspective of the present work (Trochet et al 2016(Trochet et al , 2017.…”

Section: Divergent Site Fidelity Phenotypes Within the Populationmentioning

confidence: 98%

Dispersal and alternative breeding site fidelity strategies in an amphibian

et al. 2018

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Dispersal (i.e. movement from a natal or breeding site to another breeding site) is a central process in ecology and evolution as it affects the eco‐evolutionary dynamics of spatially structured populations. Dispersal evolution is regulated by the balance between costs and benefits, which is influenced by the individual phenotype (i.e. phenotype‐dependent dispersal) and environmental factors (i.e. condition‐dependent dispersal). Even though these processes have been extensively studied in species with simple life cycles, our knowledge about these mechanisms in organisms displaying complex life cycles remains fragmentary. In fact, little is specifically known about how the interplay between individual and environmental factors may lead to alternative dispersal strategies that, in turn, lead to the coexistence of contrasted site fidelity phenotypes. In this paper, we examined breeding dispersal in a pond‐breeding amphibian, the great crested newt Triturus cristatus, within usual walking distances for a newt. We took advantage of recent developments in multi‐event capture–recapture models and used capture–recapture data (946 newts marked) collected in a spatially structured population occupying a large pond network (73 ponds). We showed a high rate of breeding site infidelity (i.e. pond use) and the coexistence of two dispersal phenotypes, namely, a highly pond faithful phenotype and a dispersing phenotype. Individuals that were site faithful at time t – 1 were therefore more likely to remain site faithful at time t. Our results also demonstrated that the probability that individuals belong to one or the other dispersal phenotypes depended on environmental and individual factors. In particular, we highlighted the existence of a dispersal syndrome implying a covariation pattern among dispersal behavior, body size, and survival. Our work opens new research prospects in the evolution of dispersal in organisms displaying complex life cycles and raises interesting questions about the evolutionary pathways that contribute to the diversification of movement strategies in the wild.

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Section: Divergent Site Fidelity Phenotypes Within the Populationmentioning

confidence: 98%

Dispersal and alternative breeding site fidelity strategies in an amphibian

et al. 2018

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“…The area identified in the northwestern quarter of the study area was predicted to decrease in connectivity under RCP 2.6. Enhancing the sustaining functionality of the pond network and the connectivity with the surrounding patches might help to buffer this variation, especially by conserving and restoring small ponds and features such as hedgerows or deciduous patches 61,78 favouring the species' overwintering, protection against dehydration and seasonal breeding movements. In parallel, relevant actors such as NGOs or other associations in the field of biodiversity protection could systematically bring up the results when consulted on land planning and urban projects, and aware of any risk of habitat destruction or connectivity disruption, particularly in areas identified as sources for these species.…”

Section: Discussionmentioning

confidence: 99%

“…Here, both land-cover-only and climate-only ENMs obtained satisfying evaluations according to TSS and AUC, which tends to confirm the choice of predictor variables. However, it is noteworthy that the variable "hedges" was not retained during the variable selection procedure whereas it is considered as important for newts 61 . This could be explained by a lack of precision in the data available for the study area, or because this variable is not significant in our study area.…”

Section: Discussionmentioning

confidence: 99%

“…The calculation of the IF involves specifying a distance relative to dispersal of the species. While dispersal in pond breeding amphibians is mostly achieved by juveniles 60 , most studies on amphibians are conducted on adult individuals, where radio tracking is easier, and movements attributed to newts are in the order of a few hundred meters 28,61,62 . Based on our field experience, we decided to use a maximum dispersal distance of 1 km for both newt species.…”

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confidence: 99%

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Habitat patches for newts in the face of climate change: local scale assessment combining niche modelling and graph theory

Préau

Grandjean

Sellier³

et al. 2020

Sci Rep

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& francis isselin-nondedeu 3,6Triturus cristatus and Triturus marmoratus are two protected and declining newts occurring in the administrative department of Vienne, in France. They have limited dispersal abilities and rely on the connectivity between habitats and their suitability. In a warming climate, the locations of suitable habitats are expected to change, as is the connectivity. Here, we wondered how climate change might affect shifts in habitat suitability and connectivity of habitat patches, as connectivity is a key element enabling species to realize a potential range shift. We used ecological niche modelling (ENM), combining large-scale climate suitability with local scale, high-resolution habitat features, to identify suitable areas for the two species, under low and high warming scenarios (RCP 2.6 and RCP 8.5). We associated it with connectivity assessment through graph theory. The variable 'small ponds' contributed most to land cover-only ENMs for both species. Projections with climate change scenarios revealed a potential impact of warming on suitable habitat patches for newts, especially for T. cristatus. We observed a decrease in connectivity following a decrease in patch suitability. Our results highlight the important areas for newt habitat connectivity within the study area, and define those potentially threatened by climate warming. We provide information for prioritizing sites for acquisition, protection or restoration, and to advise landscape policies. Our framework is a useful and easily reproducible way to combine global climate requirements of the species with detailed information on species habitats and occurrence when available. open Scientific RepoRtS | (2020) 10:3570 | https://doi.org/10.1038/s41598-020-60479-4www.nature.com/scientificreports www.nature.com/scientificreports/ connected by "edges", which refer to ecological corridors. Landscape graphs can be used to represent ecological networks and to analyse connectivity between habitats, with, for instance, the purpose of prioritizing sites for protection, improving connectivity, or assessing potential effect of an urban development project 19,20 . In this approach, the landscape between habitat patches is represented by a "resistance" or "cost" which estimates the relationships between environmental variables and movement of the considered species 21 . Resistance surfaces can be categorical, with a cost associated with land cover types 22 ; continuous, for example from an output of ENM, where resistance increases when habitat suitability decreases 23,24 ; or binary, assuming that the influence of the matrix on species movement is homogenous between patches 25 . Ziółkowska et al. 26 have compared the efficiency of such resistance surface representation on landscape connectivity assessment and they recommend using continuous resistance surface whenever possible. Using a habitat suitability map from ENM helps to overcome a lack of sufficient data. The use of ENM output is also a way to explore predictions of changes in high habitat su...

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“…Contrary to common toads that generally avoid this kind of habitat type, marbled newts also occur in more open areas like heathens and agricultural landscapes. Common toads and marbled newts can live within the same habitat, such as grassland or woodland, and could therefore face the same environmental pressures during terrestrial movements (Daversa, Muths & Bosch 2012;Trochet et al, 2017). Also, both the contrasting morphology and modes of locomotion induce different muscular contractions during displacement, leading to different mobility ability between the two species (Smith and Green, 2005) and therefore explain the selection of various habitats encounter during terrestrial phase.…”

Section: Introductionmentioning

confidence: 99%

Peer Review #1 of "Influence of substrate types and morphological traits on movement behavior in a toad and newt species (v0.1)"

Youngquist¹

2019

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Background. Inter-patch movements may lead to genetic mixing, decreasing both inbreeding and population extinction risks, and is hence a crucial aspect of amphibian meta-population dynamics. Traveling through heterogeneous landscapes might be particularly risky for amphibians. Understanding how these species perceive their environment and how they move in heterogeneous habitats is an essential step in explaining metapopulation dynamics and can be important for predicting species' responses to climate change and for conservation policy and management. Methods. Using an experimental approach, the present study focused on the movement behavior (crossing speed and number of stops) on different substrates mimicking landscape components (human-made and natural substrates) in two amphibian species contrasting in locomotion mode: the common toad (Bufo bufo), a hopping and burrowing anuran and the marbled newt (Triturus marmoratus), a walking salamander. We tested the hypothesis that species reaction to substrate nature is dependent on specific ecological requirements or locomotion modes because of morphological and behavioral differences. Results. In both species, substrate type influenced individual crossing speed, with individuals moving faster on soil than on concrete substrate. We also demonstrated that long-legged individuals moved faster than individuals with short legs. In both species, the number of stops was higher in females than in males. In common toads, the number of stops did not vary between substrates tested, whereas in marbled newts the number of stops was higher in cement than in soil substrate. Discussion. We highlighted that concrete substrate (mimicking roads) negatively affect the crossing speed of both studied species, with an effect potentially higher in marbled newts. Our findings corroborate negative effects of such heterogeneous landscapes on movement behavior of two amphibian species, which may have implications for the dynamics of metapopulations.

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Postbreeding Movements in Marbled Newts (Caudata, Salamandridae): A Comparative Radiotracking Study in Two Habitat Types

Cited by 17 publications

References 73 publications

Dispersal and alternative breeding site fidelity strategies in an amphibian

Dispersal and alternative breeding site fidelity strategies in an amphibian

Habitat patches for newts in the face of climate change: local scale assessment combining niche modelling and graph theory

Peer Review #1 of "Influence of substrate types and morphological traits on movement behavior in a toad and newt species (v0.1)"

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