Artificial Displacement Alters Movement Behavior of a Terrestrial Amphibian

Jreidini, Nathalie; Green, David M.

doi:10.1655/herpetologica-d-21-00031

Cited by 5 publications

(5 citation statements)

References 51 publications

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“…The total dataset was comprised of observations for 700 adult females, 393 adult males, and 842 juveniles, whereby juveniles were identified as either female or male once sexually mature. As is invariably the case for dispersal data (Fraser et al, 2001;Smith & Green, 2006) and for short time-scale movements in this population (Jreidini & Green, 2022) We found that 24 h movement distances were neither sexbiased nor age-biased, taking differences in SVL into consideration.…”

Section: Re Sultssupporting

confidence: 59%

“…A higher water level translates to a narrower beach and a disrupted dune structure in the Long Point landscape. But A. fowleri can locate previous refuge sites despite landscape dynamicity, as they can be home from various distances away from their starting point following artificial displacement (Jreidini & Green, 2022 ). Thus, unpredictable landscape change impacts A. fowleri stochastic movement distances, to some extent, but not by disrupting their homing capacities.…”

Section: Discussionmentioning

confidence: 99%

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Dispersal without drivers: Intrinsic and extrinsic variables have no impact on movement distances in a terrestrial amphibian

Jreidini

Green

2022

Ecology and Evolution

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Dispersive movements are often thought to be multicausal and driven by individual body size, sex, conspecific density, environmental variation, personality, and/or other variables. Yet such variables often do not account for most of the variation among dispersive movements in nature, leaving open the possibility that dispersion may be indeterministic. We assessed the amount of variation in 24 h movement distances that could be accounted for by potential drivers of displacement with a large empirical dataset of movement distances performed by Fowler's Toads ( Anaxyrus fowleri ) on the northern shore of Lake Erie at Long Point, Ontario (2002–2021, incl.). These toads are easy to sample repeatedly, can be identified individually and move parallel to the shoreline as they forage at night, potentially dispersing to new refuge sites. Using a linear mixed‐effect model that incorporated random effect terms to account for sampling variance and inter‐annual variation, we found that all potential intrinsic and extrinsic drivers of movement accounted for virtually none of the variation observed among 24 h distances moved by these animals, whether over short or large spatial scales. We examined the idea of movement personality by testing variance per individual toad and found no evidence of individuality in movement distances. We conclude that deterministic variables, whether intrinsic or extrinsic, neither can be shown to nor are necessary to drive movements in this population over all spatial scales. Stochastic, short time‐scale movements, such as daily foraging movements, can instead accumulate over time to produce large spatial‐scale movements that are dispersive in nature.

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Section: Re Sultssupporting

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Dispersal without drivers: Intrinsic and extrinsic variables have no impact on movement distances in a terrestrial amphibian

Jreidini

Green

2022

Ecology and Evolution

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“…Although the spatial extent of movements can depend on individual traits (Cayuela et al, 2020;Hillman et al, 2014;Hust e et al, 2006;Sinsch, 2014;Trochet et al, 2016), we failed to detect any effect of body size and sex on the distances between captures (see also Jreidini & Green, 2022a, 2022bSmith & Green, 2006). Although it is likely that individuals move greater distances to reproduce (Priol, 2015), our results suggest that individuals are able to return to a specific terrestrial site between reproductive events (see also Jreidini & Green, 2022b). Future studies are required to identify which environmental cues (i.e., odors, landmarks, positions of sun, moon and stars, and polarization patterns of the sky or magnetic fields, Sinsch, 1990) allow such marked site fidelity and if breeding migratory movements result in individuals moving larger distances to different sites.…”

Section: Discussionmentioning

confidence: 66%

“…However, we cannot differentiate movements linked to reproduction (migration to ponds) from those expressed during non-breeding activities (resting; foraging), during which individuals could express diverging patterns (Bailey & Muths, 2019;Cayuela et al, 2017;Joly, 2019). Although the spatial extent of movements can depend on individual traits (Cayuela et al, 2020;Hillman et al, 2014;Hust e et al, 2006;Sinsch, 2014;Trochet et al, 2016), we failed to detect any effect of body size and sex on the distances between captures (see also Jreidini & Green, 2022a, 2022bSmith & Green, 2006). Although it is likely that individuals move greater distances to reproduce (Priol, 2015), our results suggest that individuals are able to return to a specific terrestrial site between reproductive events (see also Jreidini & Green, 2022b).…”

Section: Discussionmentioning

confidence: 79%

“…In this study, we used a capture–mark–recapture design during 3 consecutive years (in autumn, outside the reproductive period of the species) to investigate how distance to the sea influences growth rates and foraging movements in the western spadefoot toad ( Pelobates cultripes ), in three populations from the French Atlantic coast. We posit that (1) growth rates should be higher in juveniles because growth rates decrease with increasing body size (Hota, 1994; Turner, 1962), growth rates should be higher in females because they reach larger body size than males of the same age (Hota, 1994; Wells, 2007), and that growth rates should be higher farther to the seashore according to the physiological constraint of salinity near the coast (Lorrain‐Soligon, Robin, Lelong, Jankovic, Bustamante, et al., 2022), (2) movements (distance traveled) outside the reproductive season (i.e., linked to foraging, Jreidini & Green, 2022a; Jreidini & Green, 2022b; Pittman et al., 2014; Russell et al., 2005) should be higher in juveniles (Bulger et al., 2003; Smith & Green, 2006) and females (Trochet et al., 2016) to sustain higher growth rates (Hota, 1994; Wells, 2007) and should be lower near the seashore if exposure to salinity negatively affects activity (Feder & Londos, 1984; Lorrain‐Soligon, Robin, Lelong, Jankovic, Barbraud, et al., 2022; Titon Jr et al., 2010), and (3) that individuals should express high site fidelity according to their ecology (Priol, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Life on the beach: Movements and growth of a coastal amphibian vary with distance to the sea

Lorrain‐Soligon,

Robin,

Palier

et al. 2023

Journal of Zoology

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Proximity to the seashore is a critical structuring factor of coastal wetlands due to its influence on varying sources of nutrients (marine and terrestrial) and on the spatial gradient of salinity (higher salinity closer to the seashore). The spatial gradient of salinity may impact organisms because most organisms need to maintain an osmotic balance. Osmoregulation is energetically costly, and exposure to salinity should induce a trade‐off in energetic allocation between osmoregulation and other competing functions such as growth rates and movement patterns. In this study, we used a capture–mark–recapture design during 3 consecutive years to investigate how distance to the sea influences growth rates and foraging movements (outside reproduction) in the western spadefoot toad (Pelobates cultripes), a typical coastal amphibian, in three populations from the French Atlantic coast. Growth rates were lower in larger individuals and in individuals living closer to the seashore. Distances travelled between captures were very limited (~20 m). Between years, these distances were larger for individuals located on the beach rather than inland, but were not influenced by body size or sex. Exposure to salinity and associated costs of osmoregulation may explain lower growth rates closer to the shoreline. The mechanisms underlying the effects of location on distances between captures remain to be identified, but may be related to foraging for abundant prey items on the wrack line. Our study confirms the remarkable terrestrial site fidelity in P. cultripes, which might be detrimental to coastal populations if localized perturbations affect coastal environments.

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