Ontogenetic Variation in Head Morphology and Diet in Two Snakes (Viperidae) from Northeastern Argentina

López, María Luisa García; Manzano, Adriana Silvina; Prieto, Yanina

doi:10.1670/12-007

Cited by 12 publications

(6 citation statements)

References 38 publications

(45 reference statements)

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“…The consistently different values for contemporary mandibles indicate that young and old adult mice have different morphologies than their historic counterparts. Lopez et al [ 40 ] found similar results in two species of snakes that exhibited consistently different morphologies across sizes, likely associated with different diets. We also found a significant shift in the rate of morphological change associated with size for upper jaws ( Fig 4 ).…”

Section: Discussionmentioning

confidence: 79%

Rapid Morphological Change in the Masticatory Structures of an Important Ecosystem Service Provider

Doudna

Danielson

2015

PLoS ONE

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Humans have altered the biotic and abiotic environmental conditions of most organisms. In some cases, such as intensive agriculture, an organism’s entire ecosystem is converted to novel conditions. Thus, it is striking that some species continue to thrive under such conditions. The prairie deer mouse (Peromyscus maniculatus bairdii) is an example of such an organism, and so we sought to understand what role evolutionary adaptation played in the success of this species, with particular interest in adaptations to novel foods. In order to understand the evolutionary history of this species’ masticatory structures, we examined the maxilla, zygomatic plate, and mandible of historic specimens collected prior to 1910 to specimens collected in 2012 and 2013. We found that mandibles, zygomatic plates, and maxilla have all changed significantly since 1910, and that morphological development has shifted significantly. We present compelling evidence that these differences are due to natural selection as a response to a novel and ubiquitous food source, waste grain (corn, Zea mays and soybean, Glycine max).

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Section: Discussionmentioning

confidence: 79%

Rapid Morphological Change in the Masticatory Structures of an Important Ecosystem Service Provider

Doudna

Danielson

2015

PLoS ONE

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“…Although sexual dimorphism in HL is related to dietary differences as suggested by Pough & Groves (1983), Forsman (1991), Shine (1986Shine ( , 1991, Houston and Shine (1993), Forsman (1996), King (2002), Shetty & Shine (2002), Nogueira et al (2003), Aubret et al (2004), Vincent et al (2004), and López et al (2013). The differences found in HL between males and females of P. patagoniensis are not related to diet (Hartmann & Marques 2005, López & Giraudo 2008.…”

Section: Discussionmentioning

confidence: 87%

Morphological variation of Philodryas patagoniensis (Girard, 1858) (Serpentes, Dipsadidae) from Brazil, based on the study of pholidosis, coloration and morphometric features

Gouveia

Novelli

Vieira³

et al. 2017

Biota Neotrop.

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GOUVEIA, R.V., NOVELLI, I.A., VIEIRA, F.M., SOUSA, B.M. Morphological variation of Philodryas patagoniensis (Girard, 1858) (Serpentes, Dipsadidae) from Brazil, based on the study of pholidosis, coloration and morphometric features. Biota Neotropica. 17(1): e20160237. http://dx.doi.org/10.1590/1676-0611-BN-2016-0237 Abstract:The current study aimed to verify the relationship between the patterns of coloration, the morphometrical features and pholidosis of specimens of Philodryas patagoniensis from Brazil, with the sexual dimorphism of this species. We studied specimens of P. patagoniensis deposited in several herpetological collections from Brazil. A total of 355 specimens were analyzed, of these 145 were males (87 adults and 58 juveniles) and 210 were females (134 adults and 76 juveniles). Adult specimens exhibit sexual dimorphism in snout-vent length, tail length, head length, number of ventral shields, and number of subcaudal shields. The analysis of variance showed that the adult females are significantly longer than adult males, both at snout-vent length and tail length. Females have a greater number of ventral shields (138-210) than males (151-200). The specimens studied also exhibit two distinct patterns of coloration unrelated to geographical or sexual variations. Keywords

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“…rodents of the genus Microtus; Braña, Bea and Saint Girons, 1988;Galán, 1988), which are larger. Being snakes gape-limited predators, the relative size of the head, as well as head proportions, may be correlated to relative prey size (Forsman and Shine, 1997;Bonnet et al, 2001;Lopez, Manzano and Prieto, 2013). Interestingly, such size-driven variation in global head shape occurs under a common allometric trend in both sexes (table 4, fig.…”

Section: Ontogeny and Sexual Dimorphismmentioning

confidence: 99%

Sources of intraspecific morphological variation in Vipera seoanei: allometry, sex, and colour phenotype

et al. 2020

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Snakes frequently exhibit ontogenetic and sexual variation in head dimensions, as well as the occurrence of distinct colour morphotypes which might be fitness-related. In this study, we used linear biometry and geometric morphometrics to investigate intraspecific morphological variation related to allometry and sexual dimorphism in Vipera seoanei, a species that exhibits five colour morphotypes, potentially subjected to distinct ecological pressures. We measured body size (SVL), tail length and head dimensions in 391 specimens, and examined variation in biometric traits with respect to allometry, sex and colour morph. In addition, we analysed head shape variation by recording the position of 29 landmarks in 123 specimens and establishing a low-error protocol for implementing geometric morphometrics to European vipers. All head dimensions exhibited significant allometry, while sexual differences occurred for SVL, relative tail length and snout height. After considering size effects, we found significant differences in body proportions between the sexes and across colour morphs, which suggests an important influence of lowland and montane habitats in shaping morphological variation. By contrast, head shape did not exhibit significant variation across sexes or colour morphs. Instead it was mainly associated to allometric variation, where the supraocular and the rear regions of the head were the areas that varied the most throughout growth and across individuals. Overall, this study provides a thorough description of morphological variability in Vipera seoanei and highlights the relevance of combining different tools (i.e. linear and geometric morphometrics) and analyses to evaluate the relative contribution of different factors in shaping intraspecific variation.

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Ontogenetic Variation in Head Morphology and Diet in Two Snakes (Viperidae) from Northeastern Argentina

Cited by 12 publications

References 38 publications

Rapid Morphological Change in the Masticatory Structures of an Important Ecosystem Service Provider

Rapid Morphological Change in the Masticatory Structures of an Important Ecosystem Service Provider

Morphological variation of Philodryas patagoniensis (Girard, 1858) (Serpentes, Dipsadidae) from Brazil, based on the study of pholidosis, coloration and morphometric features

Sources of intraspecific morphological variation in Vipera seoanei: allometry, sex, and colour phenotype

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