Evolutionary morphology of the lizard chemosensory system
Date
2017-09-04
Journal Title
Journal ISSN
Volume Title
Publisher
Nature Research
Abstract
Foraging mode plays a pivotal role in traditional reconstructions of squamate evolution. Transitions between modes are said to spark concerted changes in the morphology, physiology, behaviour, and life history of lizards. With respect to their sensory systems, species that adopt a sit-and-wait strategy are thought to rely on visual cues primarily, while actively hunting species would predominantly use chemical information. The morphology of the tongue and the vomeronasal-organs is believed to mirror this dichotomy. Still, support for this idea of concerted evolution of the morphology of the lizard sensory system merely originates from studies comparing only a few, distantly related taxa that differ in many aspects of their biology besides foraging mode. Hence, we compared vomeronasal-lingual morphology among closely related lizard species (Lacertidae). Our findings show considerable interspecific variation indicating that the chemosensory system of lacertids has undergone substantial change over a short evolutionary time. Although our results imply independent evolution of tongue and vomeronasal-organ form, we find evidence for co-variation between sampler and sensor, hinting towards an ‘optimization’ for efficient chemoreception. Furthermore, our findings suggest species’ degree of investment in chemical signalling, and not foraging behaviour, as a leading factor driving the diversity in vomeronasal-lingual morphology among lacertid species.
Description
CITATION: Baeckens, S., et al. 2017. Evolutionary morphology of the lizard chemosensory system. Scientific Reports, 7:10141, doi:10.1038/s41598-017-09415-7.
The original publication is available at https://www.nature.com
The original publication is available at https://www.nature.com
Keywords
Lizards -- Sense organs, Lizards -- Sensory system, Lizards -- Chemosensory system -- Morphology
Citation
Baeckens, S., et al. 2017. Evolutionary morphology of the lizard chemosensory system. Scientific Reports, 7:10141, doi:10.1038/s41598-017-09415-7