Geographic Variation in the Life History of the Lizard Anolis carolinensis and Support for the Pelvic Constraint Model

Michaud, Edward J.; Echternacht, Arthur C.

doi:10.2307/1565090

Cited by 61 publications

(66 citation statements)

References 20 publications

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“…On the other hand, in females of some species of Anolis, the relationships between SVL and PGL may have a stable (stable = positive) allometric pattern (Michaud and Echternacht 1995;Butler and Losos 2002); for example, in A. nebulosus, this morphometric characteristic (PGL) revealed a high allometric growth rate in relation to body size. In some species of Anolis, the pelvic girdle is positively correlated with egg size or volume and with the quantity and quality of food resources in the environment (Michaud and Echternacht 1995).…”

Section: Allometrymentioning

confidence: 99%

“…Another explanation could be that lizards with a large body size have a higher survival rate during periodic food shortages because they are able to store more energy as fat bodies (Michaud and Echternacht 1995). This idea is also related to the hypothesis that lizards of a large body size (by energy storage) can better withstand catastrophic weather events such as hurricanes and storms over longer periods, events that are generally more intense on islands than on the mainland (Whittaker and Fernández-Palacios 2007).…”

Section: Body Sizementioning

confidence: 99%

“…In some species of Anolis, the pelvic girdle is positively correlated with egg size or volume and with the quantity and quality of food resources in the environment (Michaud and Echternacht 1995). For example, in A. carolinensis, there is a positive allometric relationship between SVL and aperture of the pelvic girdle; in other words, at greater SVL, there is a greater amplitude of the pelvic girdle.…”

Section: Allometrymentioning

confidence: 99%

“…Phenotypic responses in organisms at different spatial and temporal scales reflect a wide range of factors, such as interspecific interactions, resource availability, climate, and other environmental variations (Michaud and Echternacht 1995;Meiri 2010). Thus, a careful study of the phenotype can provide insights on the evolutionary trajectories of morphometric characteristics among populations and species (Sinervo et al 1991;Michaud and Echternacht 1995;Meiri 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Thus, a careful study of the phenotype can provide insights on the evolutionary trajectories of morphometric characteristics among populations and species (Sinervo et al 1991;Michaud and Echternacht 1995;Meiri 2010). In many groups of vertebrates, including lizards, the phenotypic responses may be related to body size at sexual maturity, and this in turn with other life history characteristics, such as size at sexual maturity, clutch size or brood size, size at hatching, and other features (Michaud and Echternacht 1995;Meiri 2010). Therefore, morphometric and allometric analysis is a fundamental tool in the study of evolutionary ecology, systematics, taxonomy, and comparative biology (Meiri 2010).…”

Section: Introductionmentioning

confidence: 99%

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Morphometric variation in island and mainland populations of two lizard species from the Pacific Coast of Mexico

Hernández‐Salinas

Ramírez‐Bautista

Pavón

et al. 2014

Rev. Chil. de Hist. Nat.

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Background: Body size exerts a strong influence on the physiology, morphology, ecology, and evolution of other life history traits in vertebrates. We compared the morphometry and allometry of two lizard species (Anolis nebulosus and Aspidoscelis lineattissima) occurring on mainland and island populations on the Pacific Coast of Mexico in order to understand the effect of an insular environment on body size and other morphometric structures. Results: Results showed that both males and females of A. nebulosus from San Pancho Island were larger in body size than those from the mainland. Moreover, males of A. lineattissima from Cocinas Island exhibited larger forms of most measured morphometric traits than those from the mainland, whereas females from both island and mainland populations did not differ in body size or in other morphometric traits analyzed. Multivariate allometric coefficients of males and females of A. nebulosus from island and mainland populations showed a lower percentage of positive allometries than in A. lineattissima, probably because the former species is highly sedentary. Island populations of both species exhibit male-biased sexual dimorphisms in body size and size-adjusted morphometric traits. In contrast to the mainland population, morphometric comparisons of body size-adjusted traits showed that male A. lineattissima were larger than females only in head length, head width, forearm length, and tibia length, whereas in A. nebulosus, sexual dimorphism was observed just in HL. Conclusions: This study supports the hypothesis (island rule) that vertebrates on islands are larger than those of conspecifics on the mainland. In addition, sexual dimorphism observed between males and females of both species and populations could be associated with allometric growth (positive or negative) from some morphometric structures, as well as differences in the growth rates of these organisms.

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Section: Allometrymentioning

confidence: 99%

Section: Body Sizementioning

confidence: 99%

Section: Allometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Morphometric variation in island and mainland populations of two lizard species from the Pacific Coast of Mexico

Hernández‐Salinas

Ramírez‐Bautista

Pavón

et al. 2014

Rev. Chil. de Hist. Nat.

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Is the Pelvis Sexually Dimorphic in Turtles?

Cordero

2018

The Anatomical Record

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Variation in the pelvis is intrinsically linked to life history evolution. This is perhaps best exemplified by sexually dimorphic pelvic variation in bipedal primates. Yet, whether this trend is applicable to other taxa is unclear. Using turtle anatomy as a model, I tested the hypothesis that the pelvis is also sexually dimorphic in egg-laying tetrapods. I sampled a natural turtle population with female-biased sexual size dimorphism (i.e., larger females). I show that the area of the egg canal (pelvic aperture) is greater in females. Morphological differences between sexes were predicted by body size, such that skeletal shape deformation of the female ilium increased proportionally with pelvic aperture area. These results suggest that sexual pelvic dimorphism might be indirectly maintained by selection for large female size, consistent with the pelvic constraint hypothesis in reptiles. However, subsampling of similarly sized individuals revealed that pelvic aperture area and shape may vary in disproportion to body size. Comparisons of pelvic ontogenetic trajectories across multiple lineages are needed to clarify the occurrence of sexual pelvic dimorphism in turtles and other egg-laying tetrapods. My findings provide impetus to further explore how sex-specific functional demands influence the architecture of the pelvic girdle. Anat Rec, 2018. © 2018 Wiley Periodicals, Inc.

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Reproductive cycles and reproductive strategies among populations of the Rose‐bellied Lizard Sceloporus variabilis (Squamata: Phrynosomatidae) from central Mexico

Cruz‐Elizalde

Ramírez‐Bautista

2016

Ecology and Evolution

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Species with wide distribution, generally show variations in life history characteristics, which can be attributed to environmental causes. In this study, we analyzed the reproductive cycle and reproductive characteristics from three populations (Atlapexco, San Pablo Tetlapayac, and Santa Catarina) of the lizard Sceloporus variabilis from central Mexico. The specific goal of this study was to evaluate life history characteristics such as reproductive period extent, SVL (snout‐vent length) at sexual maturity, clutch size, egg mass and volume, and RCM (relative clutch mass). The San Pablo Tetlapayac population showed a larger clutch size, RCM, egg mass, and a smaller SVL, body mass and reproductive period (January‐September), as well as egg volume than the Atlapexco and Santa Catarina populations. Reproductive cycle and reproductive characteristics were more similar between the Atlapexco and Santa Catarina populations. Differences found in the population of San Pablo Tetlapayac with respect to the Atlapexco and Santa Catarina populations could be attributed to environmental variations where lizard populations occur. Differences in the reproductive period and reproductive characteristics in each population could be the result of both historical (phylogenetic; e.g., reproductive mode) and nonhistorical (environmental; e.g., temperature, food availability) causes. This study showed that populations of the same species are under different selection pressures, and these affect the reproductive characteristics of populations. Our results also indicate that long‐term and targeted studies on predation, use and selection of food, are needed to determine the causes of these variations in populations of S. variabilis.

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Geographic Variation in the Life History of the Lizard Anolis carolinensis and Support for the Pelvic Constraint Model

Cited by 61 publications

References 20 publications

Morphometric variation in island and mainland populations of two lizard species from the Pacific Coast of Mexico

Morphometric variation in island and mainland populations of two lizard species from the Pacific Coast of Mexico

Is the Pelvis Sexually Dimorphic in Turtles?

Reproductive cycles and reproductive strategies among populations of the Rose‐bellied Lizard Sceloporus variabilis (Squamata: Phrynosomatidae) from central Mexico

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