Evidence that ultraviolet markings are associated with patterns of molecular gene flow

Thorpe, Roger S.; Richard, Murielle

doi:10.1073/pnas.071576798

Cited by 63 publications

(64 citation statements)

References 41 publications

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“…Yet, unlike iguanids, lacertid lizards typically do not use extensive throat displays in agonistic interactions. One exception is Gallotia galloti, where the throat region is colored darkly and bears bright blue UV-reflective spots (Thorpe and Richard, 2001). Quantitative data on the development of the m. branchiohyoideus and the use of throat extensions would, however, be needed to test for correlations between the morphology of the hyobranchial system and its use as a display organ.…”

Section: Comparative Analysismentioning

confidence: 99%

Comparative functional analysis of the hyolingual anatomy in lacertid lizards

et al. 2005

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The tongue is often considered a key innovation in the evolution of a terrestrial lifestyle as it allows animals to transport food items through the oral cavity in air, a medium with low density and viscosity. The tongue has been secondarily coopted for a wide diversity of functions, including prey capture, drinking, breathing, and defensive behaviors. Within basal lizard groups, the tongue is used primarily for the purpose of prey capture and transport. In more derived groups, however, the tongue appears specialized for chemoreceptive purposes. Here we examine the tongue structure and morphology in lacertid lizards, a group of lizards where the tongue is critical to both food transport and chemoreception. Because of the different mechanical demands imposed by these different functions, regional morphological specializations of the tongue are expected. All species of lacertid lizards examined here have relatively light tongue muscles, but a well developed hyobranchial musculature that may assist during food transport. The intrinsic musculature, including verticalis, transversalis, and longitudinalis groups, is well developed and may cause the tongue elongation and retraction observed during chemoreception and drinking. The papillary morphology is complex and shows clear differences between the tongue tips and anterior fore-tongue, and the more posterior parts of the tongue. Our data show a subdivision between the fore-and hind-tongue in both papillary structure and muscular anatomy likely allowing these animals to use their tongues effectively during both chemoreception and prey transport. Moreover, our data suggest the importance of hyobranchium movements during prey transport in lacertid lizards.

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Section: Comparative Analysismentioning

confidence: 99%

Comparative functional analysis of the hyolingual anatomy in lacertid lizards

et al. 2005

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“…galloti occupies these islands at very high densities with large, at least partly contiguous, populations within islands. There is a substantial amount of morphological and molecular (Thorpe, 1996;Thorpe et al, 1994Thorpe et al, , 1996Thorpe and Richard, 2001) variation within and between islands. The molecular phylogeny shows two primary lineages: one consisting of La Gomera and El Hierro and the other of Tenerife populations and La Palma, with La Palma and northeast Tenerife as sister groups (Thorpe et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Can Microsatellites Be Used to Infer Phylogenies? Evidence from Population Affinities of the Western Canary Island Lizard (Gallotia galloti)

Richard

Thorpe

2001

Molecular Phylogenetics and Evolution

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“…More recent work has shown that lacertids have prominent UV colorations, often sexually dimorphic, that may function as social signals (e.g. Thorpe and Richard, 2001;Font and Molina-Borja, 2004;Molina-Borja et al, 2006;Pérez i de Lanuza and Font, 2007;Font et al, 2009;Pérez i de Lanuza, 2012;Pérez i de Lanuza et al, 2013b;Pérez i de Lanuza et al, 2014), but nothing is known about the visual perception of any lacertid in this wavelength range. Although the results of some behavioural experiments are consistent with the possibility that lacertids perceive UV wavelengths (Martín and López, 2009;Bajer et al, 2010), a conclusive demonstration of UV vision in this large lizard clade is lacking.…”

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confidence: 99%

Ultraviolet vision in lacertid lizards: evidence from retinal structure, eye transmittance, SWS1 visual pigment genes, and behaviour

Lanuza

Font

2014

Journal of Experimental Biology

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Ultraviolet (UV) vision and UV colour patches have been reported in a wide range of taxa and are increasingly appreciated as an integral part of vertebrate visual perception and communication systems. Previous studies with Lacertidae, a lizard family with diverse and complex coloration, have revealed the existence of UV-reflecting patches that may function as social signals. However, confirmation of the signalling role of UV coloration requires demonstrating that the lizards are capable of vision in the UV waveband. Here we use a multidisciplinary approach to characterize the visual sensitivity of a diverse sample of lacertid species. Spectral transmission measurements of the ocular media show that wavelengths down to 300 nm are transmitted in all the species sampled. Four retinal oil droplet types can be identified in the lacertid retina. Two types are pigmented and two are colourless. Fluorescence microscopy reveals that a type of colourless droplet is UV-transmitting and may thus be associated with UV-sensitive cones. DNA sequencing shows that lacertids have a functional SWS1 opsin, very similar at 13 critical sites to that in the presumed ancestral vertebrate (which was UV sensitive) and other UV-sensitive lizards. Finally, males of Podarcis muralis are capable of discriminating between two views of the same stimulus that differ only in the presence/absence of UV radiance. Taken together, these results provide convergent evidence of UV vision in lacertids, very likely by means of an independent photopigment. Moreover, the presence of four oil droplet types suggests that lacertids have a four-cone colour vision system.

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Evidence that ultraviolet markings are associated with patterns of molecular gene flow

Cited by 63 publications

References 41 publications

Comparative functional analysis of the hyolingual anatomy in lacertid lizards

Comparative functional analysis of the hyolingual anatomy in lacertid lizards

Can Microsatellites Be Used to Infer Phylogenies? Evidence from Population Affinities of the Western Canary Island Lizard (Gallotia galloti)

Ultraviolet vision in lacertid lizards: evidence from retinal structure, eye transmittance, SWS1 visual pigment genes, and behaviour

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