Abstract
Studies of habitat selection are crucial for the conservation of threatened amphibians. Wild salamanders are often distributed near rocks or vegetation, which provide shelter. However, nothing is known about habitat selection of the Mexican axolotl (Ambystoma mexicanum), an endangered salamander of great cultural and ecological value. This study aims to test the relationship between vegetation presence and the distribution of captive-raised axolotls in two systems: a closed canal in their native ecosystem (n = 10) and an artificial canal within a zoological park (n = 6). We used radio-telemetry to analyse the hourly distribution and movement patterns of axolotls in each study site during 72-h observational periods. We found that movement patterns and microhabitat selection were related to vegetation coverage and diurnal and nocturnal periods. Sex and age had no effect in habitat selection. Axolotls in both study sites preferred vegetated microhabitats, but in Xochimilco this preference was only significant during daytime when they were less active. These habitat-specific patterns of spatial distribution may represent behavioural strategies for reducing predation. The first approach of behavioural insights from this study will inform the construction of refuges to reduce the alarming depletion of axolotls in the wild.
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Acknowledgements
We are grateful to the Zoológico de Chapultepec for allowing us to use their facilities, Adriana Fernández Ortega for providing us with useful information, and Gustavo Cabrera and Ruben Rojas in CORENA for partly supporting the project. Horacio Mena carried out the microchip implants and followed the health of the animals during the whole experiment. This work was part of CA’s thesis at the Posgrado de Ciencias Biológicas. AGR received a postdoctoral research Grant from PAPIIT IV200117 and IV210117.
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Supplementary material 1 (PNG 6035 kb). Photographs showing the natural canal in Xochimilco (A) and the artificial canal in the Zoológico de Chapultepec (B)
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Supplementary material 2 (JPEG 6024 kb). Figures showing the spatial locations of individual axolotls (Ambystoma mexicanum) within the zoo (n = 6) and Xochimilco canals (March, n = 5; June, n = 5), each map represents one unique animal. The 72 points observed within quadrats, represent the hourly positions of each individual axolotl. Appendix 2A represents the zoo experiment, appendix 2B represents XochM, which was the first experiment in Xochimilco, and appendix 2C is XochJ, which was the second experiment in Xochimilco
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Ayala, C., Ramos, A.G., Merlo, Á. et al. Microhabitat selection of axolotls, Ambystoma mexicanum, in artificial and natural aquatic systems. Hydrobiologia 828, 11–20 (2019). https://doi.org/10.1007/s10750-018-3792-8
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DOI: https://doi.org/10.1007/s10750-018-3792-8