Dimorfismo sexual y ciclo reproductivo de la lagartija espinosa arbórea Sceloporus formosus Wiegmann (Squamata: Phrynosomatidae) de la zona central del estado de Oaxaca, México

It is well known that geographic variation oceurs in life history characteristics among populations of lizards. Variations in life histories found in some studies are possibly adaptations to environmental pressures. In southwestern México, the reproductive characteristics of the endemic species Scel...

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Autores principales:	RAMÍREZ-BAUTISTA,AURELIO, PAVÓN,NUMA P
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2009
Materias:	litter size reproductive eyeles reproductive strategy tropical lizards
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000400009
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spelling	oai:scielo:S0716-078X20090004000092010-03-23Dimorfismo sexual y ciclo reproductivo de la lagartija espinosa arbórea Sceloporus formosus Wiegmann (Squamata: Phrynosomatidae) de la zona central del estado de Oaxaca, MéxicoRAMÍREZ-BAUTISTA,AURELIOPAVÓN,NUMA P litter size reproductive eyeles reproductive strategy tropical lizards It is well known that geographic variation oceurs in life history characteristics among populations of lizards. Variations in life histories found in some studies are possibly adaptations to environmental pressures. In southwestern México, the reproductive characteristics of the endemic species Sceloporus formosus have been poorly studied throughout its geographic range. We used specimens from scientific collections to describe male and female reproductive eyeles and sexual dimorphism of S. formosus. Other viviparous Sceloporus from high elevations show sexual dimorphism, with males being larger in many morphological characteristics than females. We therefore expected that S. formosus would show sexual dimorphism. However, we found no sexual dimorphism. Males reached sexual maturity at a smaller (47 mm) snout-vent length (SVL) than females (50 mm). There were no significant differences between sexes and months in liver mass. However, fat body mass in females was greater than in males. For males, there was significant relationship between log10-testis volume and log10-SVL. Testis volume was positively correlated with temperature and was smallest during October, November, and December. For females, there was no significant effect of month on gonad volume. Vitellogenesis oceurred from April to November. Vitellogenic follicles and embryonic development were significantly correlated with precipitation (Pearson correlation, r = 0.80, n = 10, P = 0.0081) and photoperiod (Pearson correlation, r = 0.72, n = 10, P < 0.0001). Litter size based on embryos was correlated with SVL (Pearson correlation, r = 0.82, n = 10, P = 0.0034). Relative litter mass was not correlated with female SVL (Pearson correlation, r = 0.43, n = 10, P = 0.2110). The fall reproductive pattern found in this species is typical of viviparous species from high elevation, where temperature is low, and precipitation and relative humidity are high. If so, it would suggest that convergence in reproductive cycle could be associated with a shift to montane habitats in these species.info:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.82 n.4 20092009-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000400009en10.4067/S0716-078X2009000400009
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	litter size reproductive eyeles reproductive strategy tropical lizards
spellingShingle	litter size reproductive eyeles reproductive strategy tropical lizards RAMÍREZ-BAUTISTA,AURELIO PAVÓN,NUMA P Dimorfismo sexual y ciclo reproductivo de la lagartija espinosa arbórea Sceloporus formosus Wiegmann (Squamata: Phrynosomatidae) de la zona central del estado de Oaxaca, México
description	It is well known that geographic variation oceurs in life history characteristics among populations of lizards. Variations in life histories found in some studies are possibly adaptations to environmental pressures. In southwestern México, the reproductive characteristics of the endemic species Sceloporus formosus have been poorly studied throughout its geographic range. We used specimens from scientific collections to describe male and female reproductive eyeles and sexual dimorphism of S. formosus. Other viviparous Sceloporus from high elevations show sexual dimorphism, with males being larger in many morphological characteristics than females. We therefore expected that S. formosus would show sexual dimorphism. However, we found no sexual dimorphism. Males reached sexual maturity at a smaller (47 mm) snout-vent length (SVL) than females (50 mm). There were no significant differences between sexes and months in liver mass. However, fat body mass in females was greater than in males. For males, there was significant relationship between log10-testis volume and log10-SVL. Testis volume was positively correlated with temperature and was smallest during October, November, and December. For females, there was no significant effect of month on gonad volume. Vitellogenesis oceurred from April to November. Vitellogenic follicles and embryonic development were significantly correlated with precipitation (Pearson correlation, r = 0.80, n = 10, P = 0.0081) and photoperiod (Pearson correlation, r = 0.72, n = 10, P < 0.0001). Litter size based on embryos was correlated with SVL (Pearson correlation, r = 0.82, n = 10, P = 0.0034). Relative litter mass was not correlated with female SVL (Pearson correlation, r = 0.43, n = 10, P = 0.2110). The fall reproductive pattern found in this species is typical of viviparous species from high elevation, where temperature is low, and precipitation and relative humidity are high. If so, it would suggest that convergence in reproductive cycle could be associated with a shift to montane habitats in these species.
author	RAMÍREZ-BAUTISTA,AURELIO PAVÓN,NUMA P
author_facet	RAMÍREZ-BAUTISTA,AURELIO PAVÓN,NUMA P
author_sort	RAMÍREZ-BAUTISTA,AURELIO
title	Dimorfismo sexual y ciclo reproductivo de la lagartija espinosa arbórea Sceloporus formosus Wiegmann (Squamata: Phrynosomatidae) de la zona central del estado de Oaxaca, México
title_short	Dimorfismo sexual y ciclo reproductivo de la lagartija espinosa arbórea Sceloporus formosus Wiegmann (Squamata: Phrynosomatidae) de la zona central del estado de Oaxaca, México
title_full	Dimorfismo sexual y ciclo reproductivo de la lagartija espinosa arbórea Sceloporus formosus Wiegmann (Squamata: Phrynosomatidae) de la zona central del estado de Oaxaca, México
title_fullStr	Dimorfismo sexual y ciclo reproductivo de la lagartija espinosa arbórea Sceloporus formosus Wiegmann (Squamata: Phrynosomatidae) de la zona central del estado de Oaxaca, México
title_full_unstemmed	Dimorfismo sexual y ciclo reproductivo de la lagartija espinosa arbórea Sceloporus formosus Wiegmann (Squamata: Phrynosomatidae) de la zona central del estado de Oaxaca, México
title_sort	dimorfismo sexual y ciclo reproductivo de la lagartija espinosa arbórea sceloporus formosus wiegmann (squamata: phrynosomatidae) de la zona central del estado de oaxaca, méxico
publisher	Sociedad de Biología de Chile
publishDate	2009
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000400009
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_version_	1718439631501918208

Dimorfismo sexual y ciclo reproductivo de la lagartija espinosa arbórea Sceloporus formosus Wiegmann (Squamata: Phrynosomatidae) de la zona central del estado de Oaxaca, México

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