Reproductive Biology of the Parthenogenetic Lizard, Aspidoscelis Cozumela

Manríquez–Morán, Norma L.; Cruz, Maricela Villagrán–Santa; Cruz, Fausto R. Méndez–de la

doi:10.1655/04-41.1

Cited by 20 publications

(14 citation statements)

References 13 publications

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“…For example, day length (Manríquez‐Morán et al . ), latitude and/or cool overcast days ‘nortes’ (Hernández‐Gallegos et al . ), solar radiation (Mesquita and Colli ), abundance of prey (Censky and McCoy ; Colli et al .…”

Section: Introductionmentioning

confidence: 99%

Male reproductive cycle in Aspidoscelis costata costata (Squamata: Teiidae) from Tonatico, Estado de México, México

et al. 2013

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The purpose of this study was to investigate the reproductive cycle of a high‐elevation population of Aspidoscelis costata costata (1500–1600 m) and compare its reproductive cycle with that of other populations, species, and closely related genera. Adult male A. costata costata lizards were collected, and the reproductive tracts were removed and subjected to histological analyses. Testicular activity commences in March with maximum testicular activity and highest sperm abundance (in the epididymides) occurring between May and July. The testis remains at peak activity until September when a late regression/early quiescent phase is observed. Leydig cells follow this same pattern except these hormone‐producing cells remain at maximum secretory level through September. Sperm are present in the epididymides in April–September. This pattern is consistent with the spring recrudescence found in a multitude of male lizard taxa. However, this differs from the continuous cycle observed in some tropical Teiid species and other lizard taxa at high elevation. This study indicates that our knowledge about lizard spermatogenic cycles remains incomplete, and additional studies are required to fully understand the interactions between phenotype, evolution, phylogenetics and environment.

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Section: Introductionmentioning

confidence: 99%

Male reproductive cycle in Aspidoscelis costata costata (Squamata: Teiidae) from Tonatico, Estado de México, México

et al. 2013

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“…Dirzo et al (2014) propusieron que las siguientes características pueden ser indicadoras de riesgo de extinción en vertebrados: distribución geográfica restringida, tasa reproductora baja, ámbito hogareño amplio y tamaño corporal grande. En este sentido la lagartija partenogenética A. cozumela tendría un riesgo de extinción intermedio, ya que cumpliría con los primeros dos criterios: es microendémica de Isla Cozumel y presenta el tamaño de nidada más bajo del género Aspidoscelis (Lee, 1996;Manríquez-Morán et al, 2005). Bajo condiciones naturales, el ámbito hogareño y tamaño corporal pequeños y otras características bioló-gicas (i. e., doble potencial reproductor, madurez sexual temprana y tiempos generacionales cortos, Hernández-Gallegos, 2004), pueden promover su prevalencia en las playas y colateralmente disminuirían su riesgo de extinción.…”

Section: Discussionunclassified

“…Sin embargo, las actividades antropogénicas en Isla Cozumel pueden incrementar significativamente dicho riesgo. En Isla Cozumel, las playas y su vegetación nativa se encuentran altamente amenazadas por el desarrollo de la infraestructura turística, de hecho por esta actividad la mayoría de las poblaciones del lado Oeste de la isla han sido extirpadas (Manríquez-Morán & Méndez-de la Cruz, 2008). Cabe señalar que, por actividades humanas, otros grupos de vertebrados como mamíferos y aves enfrentan severas problemáticas de conservación en Isla Cozumel (Martínez-Morales, 1999;Cuarón, Martínez-Morales, McFadden, Valenzuela, & Gompper, 2004).…”

Section: Discussionunclassified

“…La lagartija A. cozumela es microendémica de Isla Cozumel, es ovípara, de forrajeo amplio, insectívora, con valores bajos en supervivencia, tamaño de nidada y variación genética (Lee, 1996;Hernández-Gallegos, 2004;Manríquez-Morán, Villagrán-Santa Cruz, & Méndez-de la Cruz, 2005;Manríquez-Morán & Méndez-de la Cruz, 2008;Manríquez-Morán, Méndez-de la Cruz, & Murphy, 2014). Diversos estudios han documentado que A. cozumela tiene elevada dependencia por las playas arenosas, donde se ha registrado el mayor número de individuos y poblaciones (Lee, 1996;Hernández-Gallegos, Manríquez-Morán, Méndez, Villagrán, & Cuellar, 1998;Manríquez-Morán, 2002;Hernández-Gallegos, 2004; Díaz de la VegaPérez, Jiménez-Arcos, Manríquez-Morán, & Méndez-de la Cruz, 2013).…”

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“…La IUCN cataloga a A. cozumela en la categoría de preocupación menor. Sin embargo, la información ecoló-gica y biogeográfica disponible indica que esta lagartija se encuentra amenazada en la isla (López-González & González-Romero, 1997;Manríquez-Morán & Méndez-de la Cruz, 2008). En este trabajo se describe el ámbito hogareño de A. cozumela, con el objeto de: 1) saber si esta especie partenogenética presenta un ámbito hogareño amplio (típico en especies de forrajeo amplio), 2) evaluar el solapamiento intraespecífico, 3) comparar con otras especies de Aspidoscelis (gonocóricas y partenogenéticas) y con otras lagartijas que ocupan hábitats costeros, y 4) discutir los factores bióticos y abióticos que moldean su tamaño.…”

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Ámbito hogareño de Aspidoscelis cozumela (Squamata: Teiidae): una lagartija partenogenética microendémica de Isla Cozumel, México

Hernández-Gallegos

López‐Moreno

Méndez-Sánchez

et al. 2015

RBT

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Home range of Aspidoscelis cozumela (Squamata: Teiidae): a parthenogenetic lizard microendemic to Cozumel Island, México. Home range is defined as the area within which an individual moves to acquire resources necessary to increase their fitness and may vary inter and intra-specifically with biotic and abiotic factors. This study details the home range of the parthenogenic lizard, Aspidoscelis cozumela, an active forager microendemic to Cozumel Island, México, with high preference for open sand beaches. The home range of A. cozumela was compared with other species of Aspidoscelis (gonochoric and parthenogenetic) and other lizards that occupy coastal habitats. Furthermore, the biotic and abiotic factors that may influence home range were analyzed. This study was conducted in the beach located on the East side of the island (area of 4 000 m 2 ) that is composed primarily of halophyte vegetation with high levels of sunlight. From 1999 to 2001, nine samples were taken which included the dry, rainy, "nortes", and breeding seasons. During each sampling, capture-mark-recapture techniques were conducted and the date, time of day, and snout-vent length (SVL) were recorded to the nearest millimeter. Individuals were located in the study area using a bi-coordinate reference using 10 x 10 m subdivisions of the habitat. Home range and home range overlap were calculated using the convex polygon method in McPaal and home range/SVL correlation was tested using Pearson´s correlation. To calculate females home range, three or more recaptures were considered. A total of 20 home ranges that averaged 45.1 ± 14.0 m 2 were obtained and no correlation between SVL and home range size was detected (p = 0.9229, n = 20). However, removing individuals with outlier home ranges (females with home ranges > 100 m 2 , n = 2) resulted in a positive correlation with SVL (r = 0.61, p = 0.0072, n = 18). A 22.9 ± 5.7% overlap in home range was also detected. The small home range of A. cozumela represents the smallest home range within the Aspidoscelis genus recorded to date (including both parthenogenetic and gonochoric species) and contrasts the theoretical predictions of broad home ranges for widely foraging species. Thermoregulatory benefits and a high population density may explain the small home range of A. cozumela. Although this species is highly adapted to the environmental conditions present on the open sand beaches, anthropogenic effects on these habitats by the development of tourism infrastructure may jeopardize their existence on Cozumel Island. Rev. Biol. Trop. 63 (3): 771-781. Epub 2015 September 01.

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Testosterone is closely related to Leydig cell activity, environmental factors, and androgen receptor distribution in adult male lizards of Liolaemus cuyanus (Reptilia: Liolaemidae) during the reproductive cycle

Barauna,

Conte,

Leporati

et al. 2024

J Exp Zool Pt A

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Testosterone, the primary sex hormone in male lizards, is closely linked to Leydig cell activity (the cells where steroidogenesis occurs) throughout the reproductive cycle, but testosterone action is related to androgen receptors (ARs) distribution in the seminiferous epithelium. In temperate zones, environmental factors detected through the hypothalamic–pituitary–gonadal axis, downregulate plasma testosterone, resulting in a seasonal reproductive cycle. The aim of this work is to study plasma testosterone in adult male lizards of Liolaemus cuyanus, an oviparous species, throughout its reproductive cycle and its relationship with Leydig cell histology, TotalLeydigCell/ActiveLeydigCell (TLC/ALC) ratio, environmental factors (temperature, relative humidity and solar irradiation) and ARs distribution in seminiferous epithelium. Specimens (N = 27) were captured (October to March) in a semi‐arid zone (Valle de Matagusanos, San Juan, Argentina) and grouped into three relevant reproductive periods: pre‐reproductive (PrR), reproductive (R), and post‐reproductive (PsR). Significant differences in plasma testosterone were found among these periods, highest during R than in PsR. A significant positive correlation between plasma testosterone and TLC/ALC ratio was also observed. Plasma testosterone has a significant positive correlation only with solar irradiation, but not with the other variables. In PrR and R, ARs distribution was cytoplasmic and nuclear, shifting to only cytoplasmic in PsR. These results highlight the close correspondence between plasma testosterone, Leydig cell histology and activity, environmental factors, and ARs distribution, resulting in a synchronization that allows males of L. cuyanus to coordinate their reproductive cycle with the most favorable environmental conditions, probably for mating and birth of offspring.

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Reproductive Biology of the Parthenogenetic Lizard, Aspidoscelis Cozumela

Cited by 20 publications

References 13 publications

Male reproductive cycle in Aspidoscelis costata costata (Squamata: Teiidae) from Tonatico, Estado de México, México

Male reproductive cycle in Aspidoscelis costata costata (Squamata: Teiidae) from Tonatico, Estado de México, México

Ámbito hogareño de Aspidoscelis cozumela (Squamata: Teiidae): una lagartija partenogenética microendémica de Isla Cozumel, México

Testosterone is closely related to Leydig cell activity, environmental factors, and androgen receptor distribution in adult male lizards of Liolaemus cuyanus (Reptilia: Liolaemidae) during the reproductive cycle

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