From Effects of Linear Transport Infrastructures on Amphibians to Mitigation Measures

Guillaume Testud and Claude Miaud (July 18th 2018). From Effects of Linear Transport Infrastructures on Amphibians to Mitigation Measures, Reptiles and Amphibians David Aguillón-Gutiérrez, IntechOpen, DOI: 10.5772/intechopen.74857.

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Publicado en Herpetología | Etiquetado

Programa de voluntariado con anidación de tortugas marinas en Cabo Verde

El voluntariado es imprescindible para proteger una de las zonas de anidación mas amenazadas del mundo. Pero al mismo tiempo, los voluntarios tienen la oportunidad de estudiar cientos de tortugas y de nidos, colaborar en censos, programas de marcaje y recaptura, el traslado de cientos de nidos a zonas seguras y la liberación al mar de decenas de miles de tortuguitas. También se puede colaborar en estudios científicos.

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Publicado en Ecología, Educación, Etología, Herpetología, Orientación y migración

Neural Control of Behaviour, with a focus on Navigation. Series 1: navigation

This school is a FENS schools, organised in collaboration with the Hertie Foundation.

In this FENS Winter School, we will aim to bridge the gap between two approaches used to study the neurobiology of navigation: research coming from ethology and ecology examining how animals such as insects or birds navigate in the wild over long distances, and what sensory cues they are using; and research coming from neuroscience and psychology mostly studying navigation in rats and mice in laboratory mazes, consequently discovering several spatial cell types, including place cells, grid cells and head-direction cells.

The school is meant for PhD students and postdocs, preferably with some knowledge of the subject.

Date and Location:

10-16 December 2017

Obergurgl, Austria

Scientific chairs:

Henrik Mouritsen, Oldenburg University, Germany

Nachum Ulanovsky, Weizmann Institute of Science, Israel

Eric Warrant, Lund University, Sweden

Faculty members:

Nikita Chernetsov, Department of Vertebrate Zoology, Faculty of Biology, St. Petersburg State University, Russia
Marie Dacke, Department of Biology, Faculty of Science, Lund University, Sweden
David Foster, Johns Hopkins University, Baltimore, MD, USA
Anna Gagliardo, Department of Biology, Pisa University, Italy
Stanley Heinze, Department of Biology, Faculty of Science, Lund University, Sweden
Peter Hore, Department of Chemistry, University of Oxford, UK
Vivek Jayaraman, Janelia Research Campus, Howard Hughes Medical Institute (HHMI), Ashburn, Virginia, USA
Edvard Moser, Kavli Institute for Systems Neuroscience, Norway
Thomas Wolbers, German Center for Neurodegenerative Diseases (DZNE), Germany

More information:

Stipends are available.

Application deadline: 21 August 2017.

Publicado en Educación, Orientación y migración

Spontaneous magnetic alignment behaviour in free-living lizards | SpringerLink

Diego-Rasilla, F.J., Pérez-Mellado, V. & Pérez-Cembranos, A. Spontaneous magnetic alignment behaviour in free-living lizards. Sci Nat (2017) 104: 13. doi:10.1007/s00114-017-1439-7

Several species of vertebrates exhibit spontaneous longitudinal body axis alignment relative to the Earth’s magnetic field (i.e., magnetic alignment) while they are performing different behavioural tasks. Since magnetoreception is still not fully understood, studying magnetic alignment provides evidence for magnetoreception and broadens current knowledge of magnetic sense in animals. Furthermore, magnetic alignment widens the roles of magnetic sensitivity in animals and may contribute to shed new light on magnetoreception. In this context, spontaneous alignment in two species of lacertid lizards (Podarcis muralis and Podarcis lilfordi) during basking periods was monitored. Alignments in 255 P. muralis and 456 P. lilfordi were measured over a 5-year period. The possible influence of the sun’s position (i.e., altitude and azimuth) and geomagnetic field values corresponding to the moment in which a particular lizard was observed on lizards’ body axis orientation was evaluated. Both species exhibited a highly significant bimodal orientation along the north-northeast and south-southwest magnetic axis. The evidence from this study suggests that free-living lacertid lizards exhibit magnetic alignment behaviour, since their body alignments cannot be explained by an effect of the sun’s position. On the contrary, lizard orientations were significantly correlated with geomagnetic field values at the time of each observation. We suggest that this behaviour might provide lizards with a constant directional reference while they are sun basking. This directional reference might improve their mental map of space to accomplish efficient escape behaviour. This study is the first to provide spontaneous magnetic alignment behaviour in free-living reptiles.

Origen: Spontaneous magnetic alignment behaviour in free-living lizards | SpringerLink

Publicado en Etología, Herpetología, Orientación y migración | Etiquetado , ,

Nature is speaking

Vídeo | Publicado el por | Etiquetado

Postdoctoral fellowship

“The molecular mechanism of magnetoreception and animal navigation”. The fellowship comes from a partnership with Beijing Computational Science Research Center (CSRC) and Xie Lab at Peking University (PKU), aiming at bridging biology and physics to resolve the molecular mechanism of magnetoreception and navigation in animals.

Publicado en Orientación y migración | Etiquetado ,

Mójate por las tortugas marinas

Publicado en Orientación y migración

Effects of sex and microhabitat structure on escape behaviour in the diurnal yellow-headed gecko

Domínguez-López, Moisés E.; Diego-Rasilla, Francisco J.; Ortega-León, Ángela M. (2016). Effects of sex and microhabitat structure on escape behaviour in the diurnal gecko Gonatodes albogularis. Animal Biology, 66(1): 31-47. DOI: 10.1163/15707563-00002485

Flight initiation distance is defined as the distance between a prey and an approaching predator when the prey starts to flee. Escape theory predicts that the optimal flight initiation distance is the distance where predation risk rises to the point at which it equals the cost of fleeing. Therefore, staying close to refuge and occupying microhabitats with more abundant shelters (i.e., crevices or shrubs) may allow lizards to have shorter flight initiation distance. By simulating an approaching predator, we studied the effect of microhabitat structural complexity on escape behaviour, in particular, the distance fled before stopping and final distance (predator-prey distance when the prey stops fleeing), of a small diurnal tropical gecko, the yellow-headed gecko Gonatodes albogularis inhabiting a tropical dry forest. The findings indicate that refuge abundance and distance to the nearest potential refuge influence escape behaviour of G. albogularis. In addition, we found sex differences in escape behaviour which are not explained by microhabitat use. Females had longer flight initiation distance but shorter distance fled, and longer final distances than males.

Publicado en Etología, Herpetología

Discovery of long-sought biological compass claimed

Newly discovered ‘biocompass’ protein complex may explain how animals sense magnetic fields


Minientrada | Publicado el por

Evidence of light-dependent magnetic compass orientation in urodele amphibian larvae

Diego-Rasilla, F. J. , Luengo, R. M. & Phillips, J. B. (2015). Evidence of light-dependent magnetic compass orientation in urodele amphibian larvae. Behavioural Processes, 118: 1-7.

Experiments were conducted to investigate whether larval palmate newts undertake orientation toward or away from the home shoreline (y-axis orientation) using the geomagnetic field to steer the most direct route, and if they accomplish this task through a light-dependent magnetoreception mechanism similar to that found in anuran tadpoles and adult newts. Larval palmate newts trained and then tested under full-spectrum light showed bimodal magnetic compass orientation that coincided with the magnetic direction of the trained y-axis. In contrast, larvae trained under long-wavelength (≥500 nm) light and then tested under full-spectrum light displayed bimodal orientation perpendicular to the trained y-axis direction. These results offer evidence for the use of magnetic compass cues in orienting urodele amphibian larvae, and provide additional support for the light-dependent magnetoreception mechanism since they are in complete agreement with earlier studies showing that the observed 90° shift in the direction of magnetic compass orientation under long-wavelength light (≥500 nm) is due to a direct effect of light on the underlying magnetoreception mechanism. This study is the first to provide evidence of a light-dependent magnetic compass in larval urodeles.

Publicado en Ecología, Etología, Herpetología, Orientación y migración | Etiquetado , , , , , ,