Enrique Font

University of Valencia | UV · Instituto Cavanilles de Biodiversidad y Biología Evolutiva

Iridescence refers to the optical property of surfaces for which reflected wavelengths depend on viewing geometry. Although iridescence underlies some of the most striking animal colours, the sensory stimulation elicited by iridescent spectral shifts in relevant observers has seldom been explored. Wall lizards often show substantial intraspecific c...

During growth, many animals undergo irreversible colour changes. Despite their ecological and ethological relevance, ontogenetic colour changes (OCCs) are often overlooked. The problem is compounded when OCCs involve wavelengths invisible to humans. Wall lizards can perceive ultraviolet (UV) light, and their conspicuous ventral and ventrolateral co...

Many animal species show considerable intraspecific phenotypic variation. For species with broad distributions, this variation may result from heterogeneity in the strength and agents of selection across environments and could contribute to reproductive isolation among populations. Here, we examined interpopulation variation in a morphological trai...

The discovery of several individuals of Algyroides nigropunctatus in Chania (west of Crete) is described. Although this species has been previously described as allochthonous in other places, this is the first record outside continental Europe, quite far from its natural distribution range.

Enrique is a professor at the University of Valencia (Spain), where he heads the Ethology Lab, Cavanilles Institute of Biodiversity and Evolutionary Biology. Enrique's research is in ethology, animal communication, evolutionary biology and neuroscience. For centuries, researchers and non-specialists alike have dismissed the behaviour and cognitive...

The interplay between morphological (structures) and behavioral (acts) signals in contest assessment is still poorly understood. During contests, males of the common wall lizard (Podarcis muralis) display both morphological (i.e. static color patches) and behavioral (i.e. raised-body display, foot shakes) traits. We set out to evaluate the role of...

The 50th anniversary of the awarding of the Nobel Prize to Konrad Lorenz, Niko Tinbergen, and Karl von Frisch, arguably one of the most significant events in the history of ethology, has gone virtually unnoticed. Students and newcomers to the field may be wrongly led to believe that ethology has lost its prominent role as the leading discipline at...

Zoos and aquaria are paying increasing attention to environmental enrichment, which has proven an effective tool for the improvement of animal welfare. However, several ongoing issues have hampered progress in environmental enrichment research. Foremost among these is the taxonomic bias, which hinders our understanding of the value of enrichment fo...

Louis Daguerre imagined that his invention would be useful mainly for artistic purposes or for personal use (portraits and travel diaries, etc.), but photography actually became a valuable ally of science. The observation and documentation of natural phenomena is one of the pillars of the scientific method. In this context, photography guarantees o...

Studies of the effects of insularity on animal signals are scarce, particularly in lizards. Here, we use Lilford’s wall lizard from Dragonera (Podarcis lilfordi gigliolii) to ask how island conditions have affected its repertoire of social signals, focusing on two visual signals shared by many Podarcis species: ultraviolet (UV)–blue-reflecting vent...

In adult lizards, new neurons are generated from neural stem cells in the ventricular zone of the lateral ventricles. These new neurons migrate and integrate into the main telencephalic subdivisions. In this work we have studied adult neurogenesis in the lizard Podarcis liolepis (formerly Podarcis hispanica) by administering [³H]-thymidine and brom...

Despite abundant evidence to the contrary, non-avian reptiles are widely considered as behavioural and cognitive underachievers. The persistent myth of the sluggish, primitive, stupid reptile can be traced, at least in part, to long-standing misconceptions about reptilian brain size and organisation. Historically, reptile brains have been considere...

Colour signals are ubiquitous in nature but only recently have researchers recognised the potential of ultraviolet (UV)-reflecting colour patches to function as signals of quality. Lacertid lizards often display UV-blue patches on their flanks and black spots over their entire body, both of which are under sexual selection. They also have a cryptic...

Colour polymorphisms are widely studied to identify the mechanisms responsible for the origin and maintenance of phenotypic variability in nature. Two of the mechanisms of balancing selection currently thought to explain the long-term persistence of polymorphisms are the evolution of alternative phenotypic optima through correlational selection on...

Explaining the evolutionary origin and maintenance of color polymorphisms is a major challenge in evolutionary biology. Such polymorphisms are commonly thought to reflect the existence of alternative behavioral or life-history strategies under negative frequency-dependent selection. The European common wall lizard Podarcis muralis exhibits a striki...

Mammals and birds are capable of navigating to a goal using learned map-like representations of space (i.e. place learning), but research assessing this navigational strategy in reptiles has produced inconclusive results, in part due to the use of procedures that do not take account of the peculiarities of reptilian behavior and physiology. Here I...

Body size correlates with most structural and functional components of an organism’s phenotype – brain size being a prime example of allometric scaling with animal size. Therefore, comparative studies of brain evolution in vertebrates rely on controlling for the scaling effects of body size variation on brain size variation by calculating brain wei...

Animal body coloration is a complex trait resulting from the interplay of multiple mechanisms. While many studies address the functions of animal coloration, the mechanisms of colour production still remain unknown in most taxa. Here we compare reflectance spectra, cellular, ultra- and nano-structure of colour-producing elements, and pigment types...

Swallowtail butterflies (Papilionidae) are among the most spectacular and well‐known Lepidoptera in the European fauna, but their systematics is not fully elucidated. A notable case is that of Iphiclides feisthamelii which, after more than 180 years since description, still has a debated status, being often considered as a subspecies of Iphiclides...

Despite decades of study, mimicry continues to inspire and challenge evolutionary biologists. This essay aims to assess recent conceptual frameworks for the study of mimicry and to examine the links between mimicry and related phenomena. Mimicry is defined here as similarity in appearance and/or behavior between a mimic and a model that provides a...

Reptiles use pterin and carotenoid pigments to produce yellow, orange, and red colors. These conspicuous colors serve a diversity of signaling functions, but their molecular basis remains unresolved. Here, we show that the genomes of sympatric color morphs of the European common wall lizard (Podarcis muralis), which differ in orange and yellow pigm...

Colour polymorphic animals offer useful models to study the evolution of polymorphisms and studies with colour polymorphic lizards have contributed many advances in this field. Unfortunately, few studies address basic questions such as how observers (e.g. conspecifics) perceive the polymorphism or whether there is chromatic variability among evolut...

Animal body coloration is a complex trait resulting from the interplay of multiple colour-producing mechanisms. Increasing knowledge of the functional role of animal coloration stresses the need to study the proximate causes of colour production. Here we present a description of colour and colour producing mechanisms in two non-avian archelosaurs,...

Reptiles use pterin and carotenoid pigments to produce yellow, orange, and red colors. These conspicuous colors serve a diversity of signaling functions, but their molecular basis remains unresolved. Here, we show that the genomes of sympatric color morphs of the European common wall lizard, which differ in orange and yellow pigmentation and in the...

In many species, male coloration signals aggressiveness and/or fighting ability. Males of the Tenerife lizard (Gallotia galloti) have conspicuous ultraviolet (UV)-blue cheek and lateral color patches that are brighter in the breeding season and larger than those of females. We analyzed experimentally the effect of morphological and behavioral trait...

Colour polymorphisms are thought to be maintained by complex evolutionary processes some of which require that the colours of the alternative morphs function as chromatic signals to conspecifics. Unfortunately, a key aspect of this hypothesis has rarely been studied: whether the study species perceives its own colour variation as discrete rather th...

Published by the British Herpetological Society The blue-throated keeled lizard, Algyroides nigropunctatus, is distributed along the Adriatic coast from Italy to Greece and is sexually dichromatic. Males display a striking blue on their throat, an orange ventrum, and a dark brown dorsal colouration, but their colouration has never been objectively...

We studied local habitat conditions drive the evolution of UV signals in the common wall lizard (Podarcis muralis).

Sexual selection often plays a role in the maintenance of polymorphisms by favouring the emergence of morph-specific alternative mating tactics, which in the case of animals showing territory-based mating systems might promote differences in spatial behaviour. The European common wall lizard (Podarcis muralis) shows both a striking ventral colour p...

Management decision-making processes require reliable tools providing information on the distribution, abundance, and trend of populations. Wolves vocalize in response to human imitations of howls. Traditionally, this phenomenon has been the basis of a widespread monitoring tool to assess the reproductive status in a wolf pack, as well as to estima...

1 - Over the past twenty years, portable and relatively affordable spectrophotometers have greatly advanced the study of animal coloration. However, the small size of many colour patches poses methodological challenges that have not, to date, been assessed in the literature. Here, we tackle this issue for a reflectance spectrophotometry set-up wide...

Sexual selection is one of the main processes involved in the emergence and maintenance of heritable colour polymorphisms in a variety of taxa. Here we test whether the intensity of sexual selection, estimated from population sex ratio, predicts morph diversity in Podarcis muralis, a colour polymorphic lizard with discrete white, yellow, orange, wh...

We report the finding of two individuals of Podarcis muralis (a male and a female) from the eastern Pyrenees showing blue body coloration. This is the first report of this phenotype in P. muralis (and in any continental population of Podarcis). We characterize the unusual coloration of these individuals by comparing their reflectance spectra to tho...

Iridescence is a visual property of those surfaces that change in colour with viewing angle. Iridescence has been rarely reported in reptiles, but some snakes and lizards show this type of coloration. Here we study the effect of different angles of light incidence and observation on the spectrophotometrically assessed reflectance of dorsal colorati...

Colour polymorphisms, in which individuals showing discrete colorations (i.e. morphs) coexist within a single population, are common in the family Lacertidae. In the European common wall lizard (Podarcismuralis), individuals from polymorphic populations show either white, orange, yellow, or two mixed (orange-white and orange-yellow) ventral adult c...

Previous work with a colour polymorphic population of Podarcis muralis (Lacertidae) revealed that lizards pair by ventral colour, favouring the same colour (i.e. homomorphic) pairs. Such assortative pairing, which probably results in colour assortative mating, can have consequences for the genetic structure of the population and potentially promote...

Selection for signal efficacy (detectability) is an important factor driving the evolution of chromatic signals. Communication theory predicts that colour signals should evolve to show those properties that maximize their conspicuousness to receivers in their own visual environment. In the ventrally polymorphic lizard Podarcis muralis, visual model...

Colour signals play a key role in regulating the intensity and outcome of animal contests. Males of the common wall lizard (Podarcis muralis) show conspicuous ventrolateral ultraviolet (UV)-blue and black patches. In addition, some populations express a striking ventral colour polymorphism (i.e., discrete orange, white and yellow morphs). In this s...

Population monitoring is crucial for wildlife management and conservation. In the last few decades, wildlife researchers have increasingly applied bioacoustics tools to obtain information on several essential ecological parameters, such as distribution and abundance. One such application involves wolves (Canis lupus). These canids respond to simula...

Appendix I. (DOCX)

Many animals display complex colour patterns that comprise several adjacent, often contrasting colour patches. Combining patches of complementary colours increases the overall conspicuousness of the complex pattern, enhancing signal detection. Therefore, selection for conspicuousness may act not only on the design of single colour patches, but also...

Reducing the number of animal subjects used in biomedical experiments is desirable for ethical and practical reasons. Previous reviews of the benefits of reducing sample sizes have focused on improving experimental designs and methods of statistical analysis, but reducing the size of control groups has been considered rarely. We discuss how the num...

In polychromatic species, differences in conspicuousness among alternative color morphs may affect the costs and benefits relating to signal detectability by primary receivers and unintended observers. Using visual modeling, we studied the conspicuousness of the body coloration in a ventrally polychromatic population of common wall lizards (Podarci...

Selection for signal efficacy (detectability) is an important factor driving the evolution of chromatic signals. Theory predicts that colour signals should evolve to show those properties that maximize conspicuousness to receivers in their own visual environment. In the ventrally polymorphic lizard Podarcis muralis, visual modelling has shown morph...

Playback experiments were conducted with a pack of captive Iberian wolves. We used a habituation-discrimination paradigm to test wolves’ ability to discriminate howls based on: (1) artificial manipulation of acoustic parameters of howls and (2) the identity of howling individuals. Manipulations in fundamental frequency and frequency modulation with...

Significance The best known relationship between ants and aphids consists in aphids providing ants with honeydew while receiving hygienic services and protection in return. We report an unprecedented aphid–ant interaction in which one of the two clonally produced root-dwelling morphs of the aphid Paracletus cimiciformis imitates the cuticular hydro...

The selective forces imposed by primary receivers and unintended eavesdroppers of animal signals often act in opposite directions, constraining the development of conspicuous coloration. Because iridescent colours change their chromatic properties with viewer angle, iridescence offers a potential mechanism to relax this trade-off when the relevant...

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...

Chromatic signals result from the differential absorption of light by chemical compounds (pigment-based colours) and/or from differential scattering of light by integument nanostructures (structural colours). Both structural and pigment-based colours can be costly to produce, maintain and display, and have been shown to convey information about a v...

Chromatic signals result from the differential absorption of light by chemical compounds (pigment-based colours), and/or from differential scattering of light by integumental nano-structures (structural colours). Both structural and pigment-based colours can be costly to produce, maintain and display, and have been shown to convey information about...

Sexual selection has been invoked as a major force in the evolution of secondary sexual traits, including sexually dimorphic colorations. For example, previous studies have shown that display complexity and elaborate ornamentation in lizards are associated with variables that reflect the intensity of intrasexual selection. However, these studies ha...

Color polymorphisms are common in lizards, which provide an excellent model system to study their evolution and adaptive function. The lacertid genus Podarcis is particularly interesting because it comprises several polymorphic species. Previous studies with lacertid lizards have tried to explain the maintenance of color polymorphisms by correlatio...

For a signalling system to be stable, signals must confer net fitness benefits to senders and receivers, which means that some aspect of their design must correlate with a quality that receivers benefit from knowing about. However, examples abound where this correlation is complicated by phenomena commonly referred to as deception and/or signal unr...

In this study, we used a biologically relevant experimental procedure to ask whether mealworm beetles (Tenebrio molitor) are spontaneously capable of assessing quantities based on numerical cues. Like other insect species, mealworm beetles adjust their reproductive behavior (i.e., investment in mate guarding) according to the perceived risk of sper...

Reports an error in "Predator-elicited foot shakes in wall lizards (Podarcis muralis): Evidence for a pursuit-deterrent function" by Enrique Font, Pau Carazo, Guillem Pérez i de Lanuza and Matthew Kramer (Journal of Comparative Psychology, 2012[Feb], Vol 126[1], 87-96). Figure 2 should have been represented in color. The online version has been cor...

Under certain circumstances, prey may inform potential predators of their unprofitability by means of pursuit-deterrent signals. The evidence for pursuit-deterrent signaling in reptiles is scant and taxonomically biased. Wall lizards, Podarcis muralis (Squamata: Lacertidae) produce several distinct types of stereotyped foot shake displays, of which...

Female mate choice based on male phenotypic traits is controversial in lizards, particularly in territorial species. In this study, we examine female choice of male scent marks in a territorial lacertid lizard (Podarcis hispanica) in which scent marks have been shown to signal male size (i.e., an important determinant of competitive ability in this...