Variación morfológica asociada a los patrones de color de la garganta, en lagartijas Sceloporus horridus horridus (Sauria: Phrynosomatidae)

Guadalupe, María; Zagal, Bustos; Castro-Franco, Rubén; S, Manjarrez; Investigaciones, Centro de

doi:10.21829/azm.2014.302107

Cited by 4 publications

(10 citation statements)

References 24 publications

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“…In lizards, differences between morphs have generally been linked to differences in spatial dispersion within the landscape, body size, aggression, territory and/or home range size, and the quality of the habitats used (Thompson & Moore, 1992; Sinervo & Lively, 1996; Bustos-Zagal et al, 2014). These differences could indicate that different morphs are capable of exploiting different components of a resource gradient, and consequently that trophic niches could also diverge (Lattanzio & Miles, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Given possible differences in energy intake and expenditure between territorial and non-territorial individuals, and that prey may differ in the quantity and quality of their nutrients, morphs might also be expected to differ in their diet (Leyte-Manrique & Ramírez-Bautista, 2010; Cruz-Elizalde et al, 2014). In addition, morph-specific variation in coloration may be associated with other morphological traits, such as body size (snout-vent length; SVL) and/or head size (Hover, 1985; Sinervo & Lively, 1996; Moore, Hews & Knapp, 1998; Sinervo et al, 2000; Bustos-Zagal et al, 2014). Some of these morphological features that distinguish each morph could also act as a constraint on the type of prey that each can consume, further driving a divergence in diet.…”

Section: Introductionmentioning

confidence: 99%

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Comparative morphology and trophic ecology in a population of the polymorphic lizard Sceloporus minor (Squamata: Phrynosomatidae) from central Mexico

García-Rosales

Ramírez‐Bautista

Stephenson

2019

PeerJ

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Polymorphism among individuals of the same population has generally been linked to alternative reproductive tactics, where different morphs can exhibit differences in their morphological, ecological, and behavioral attributes. These differences may result in a divergence in diet between morphs due to differential exploitation of habitat, morphological differences that influence prey selection, or differential energy expenditure that results in different nutritional needs. The present study analyzes the morphology (morphometry and body mass) and diet of red and yellow male morphs in a population (El Enzuelado) of the lizard Sceloporus minor from central Mexico. No differences between morphs were found for any of the morphometric variables analyzed (snout-vent length, tail length, jaw length, jaw width, head length, head width, head height, tibia length, femur length, forearm length and ventral patch length). In both morphs, allometric growth was observed in all body features analyzed, as well as in morphometric features of the head across seasons. Analysis of stomach contents showed that the diet of red males was composed of 12 categories of prey, while that of yellow males was composed of 10 categories; those categories of diet not shared between morphs (e.g., Isoptera, Psocoptera) were consumed by their respective morph in very low proportions. Categories of diet with the highest values of food importance for both groups were Coleoptera, Orthoptera, and leaves; a similar pattern was seen across seasons. This, in turn, is reflected in low niche breadth values for each morph and a very high niche overlap. There were no significant differences between morphs overall, or between morphs per season, in the weight and volume of stomach contents or in the number of prey items found in stomachs; however, differences in these variables across all males (independent of morph) were recorded between seasons. Likewise, no significant correlations were found between body size (snout-vent length) and the volume of stomach contents for either morph or between lizard mandibular dimensions and the volume of stomach contents for red morph males. For the yellow morph, prey volume unexpectedly decreased significantly with jaw size rather than increasing as expected. Overall, this study adds new information about the morphology and feeding of males in this species, and suggests that in this population, color morphs lack the morphological and ecological differences found in some other species of polymorphic lizard.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative morphology and trophic ecology in a population of the polymorphic lizard Sceloporus minor (Squamata: Phrynosomatidae) from central Mexico

García-Rosales

Ramírez‐Bautista

Stephenson

2019

PeerJ

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“…Additionally, the genus exhibits extreme reproductive variation including oviparous and viviparous species as well as continuous and seasonal activity (Gribbins et al., ; Méndez‐de la Cruz, Villagrán‐Santa Cruz, & Andrews, ). Furthermore, the Sceloporus genus has numerous species in which multiple morphotypes exist within the same population (Bastiaans et al., ; Bustos Zagal, Castro‐Franco, Manjarrez, & Fajardo Guadarrama, ; Jiménez‐Arcos, ; Rand, ; Stephenson, ). This variation makes them excellent models for studies concerning reproductive characteristics and their interactions.…”

Section: Introductionmentioning

confidence: 99%

“…This variation makes them excellent models for studies concerning reproductive characteristics and their interactions. However, there have been few comparisons among male morphs within Sceloporus including morphological (Bustos Zagal et al, 2014;Jiménez-Arcos, 2013;Stephenson, 2010), life history traits, performance (Jiménez-Arcos, 2013), frequency (Jiménez-Arcos, 2013;Rand, 1990), coloration intensity and its hormonal control (Calisi & Hews, 2007;Rand, 1990Rand, , 1992, behaviour (Bastiaans et al, 2014;Stephenson, 2010) and microhabitat use (Bustos Zagal et al, 2014).…”

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confidence: 99%

“…Sceloporus aeneus is a Mexican endemic oviparous lizard with maximum testicular activity of spermiogenesis and spermiation occurring from March to May (Hernández-Gallegos et al, 2014). As colour polymorphism has been recorded in congeneric Sceloporus (Bustos Zagal et al, 2014), adult males of S. aeneus exhibit a lateral colour polymorphism including three morphs: grey, yellow and orange (Jiménez-Arcos, 2013). Numerous studies have shown that male sexual coloration is an important cue in female mate choice (Cooper & Greenberg, 1992).…”

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Lack of spermatogenic variation in a polymorphic lizard, Sceloporus aeneus (Squamata: Phrynosomatidae)

et al. 2018

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Although different mechanisms exist to explain the presence of polymorphism in lizards, one model suggests that multiple morphotypes display the same level of fitness. Three male morphs (grey, yellow and orange) coexist in Sceloporus aeneus, a Mexican endemic oviparous lizard. Using a histological perspective, we test the hypothesis that spermatogenic output does not vary across morphotypes of S. aeneus during its maximum testicular activity. Males of S. aeneus (five grey, five yellow and five orange) were collected in Calimaya, Estado de México, Mexico. Snout‐vent length (SVL), testis mass, diameter and epithelial heights for the seminiferous tubules and epididymis, and the number of layers of germ cells did not vary among morphs; moreover, according to principal component analysis, a high overlap among lateral colour morphs exists. Our results suggest strongly that the lateral colour morphs in S. aeneus have the same spermatogenic output, and natural selection may be a stronger driving force than sexual selection within this species. Further studies into other lizard species with multiple morphotypes are required to determine whether the lack of variation in spermatogenic output observed in this endemic lizard is consistent across polymorphic species which will provide a greater understanding of the selective mechanisms acting on an individual’s fitness.

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The tale of the rattle: Using rattle size to understand growth and sexual dimorphism in an insular population of rattlesnakes (Crotalus oreganus caliginis)

Nava,

Sigala‐Rodríguez,

Redetzke

et al. 2024

Ecology and Evolution

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Islands have played a key role in our understanding of rapid evolution. A large body of literature has examined morphological changes in response to insularity and isolation, which has yielded useful generalizations about how animals can adapt to live in very small geographic areas. However, understanding the evolution of morphological variation in insular populations often requires detailed data sets on longitudinal patterns of growth and development, and such studies typically necessitate long‐term mark‐recapture on a large sample of individuals. Rattlesnakes provide a unique opportunity to address some of these difficulties because the addition of rattle segments to the rattle string occurs with regular periodicity and their size directly correlates with the body size of the snake at the time of the ecdysis cycle generating the segment. Here, we used a large database of rattle segment sizes recorded from island (Isla Coronado Sur, Baja California, Mexico) and mainland (Camp Pendleton, California, United States) populations of Western Rattlesnakes (Crotalus oreganus and C. o. caliginis) that separated approximately 10,000 years ago to compare body sizes at different ecdysis cycles, which allowed us to assess differences in growth rates and patterns of sexual size dimorphism. Our results show that rattlesnakes on Isla Coronado Sur appear to be born smaller and grow more slowly than their mainland counterparts, resulting in a “dwarfed” island population. However, despite significant differences in body size, both populations exhibited the same degree of sexual dimorphism. Our study demonstrates the potential to use rattle characteristics to recover detailed estimates of fundamental demographic parameters.

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Variación morfológica asociada a los patrones de color de la garganta, en lagartijas Sceloporus horridus horridus (Sauria: Phrynosomatidae)

Cited by 4 publications

References 24 publications

Comparative morphology and trophic ecology in a population of the polymorphic lizard Sceloporus minor (Squamata: Phrynosomatidae) from central Mexico

Comparative morphology and trophic ecology in a population of the polymorphic lizard Sceloporus minor (Squamata: Phrynosomatidae) from central Mexico

Lack of spermatogenic variation in a polymorphic lizard, Sceloporus aeneus (Squamata: Phrynosomatidae)

The tale of the rattle: Using rattle size to understand growth and sexual dimorphism in an insular population of rattlesnakes (Crotalus oreganus caliginis)

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