Reproduction in the Granite Spiny Lizard, Sceloporus orcutti

Mayhew, Wilbur W.

doi:10.2307/1441282

Cited by 71 publications

(26 citation statements)

References 8 publications

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“…Specimens were collected in May 1995, July 1995, November 1995, March 1996, August-September 1996, November 1996, April 1997, February 1998and December 1999 The following data were recorded for 50 males and 49 females: SVL (mm), sex, volume of gonads (mm 3 ), number of ovarian follicles, and presence/absence of tail break. The gonads were measured with calipers under low-power magnification to the nearest 0.02 mm and the volumes of oviducal eggs and testes were estimated from the formula for a prolate spheroid: 4=3pab 2 ; where a equals the radius of the longest axis and b equals the radius of the shortest axis (Mayhew, 1963). Volume of the testes was used to infer spermatogenetic activity (Mayhew, 1965;James, 1991b).…”

Section: Reproductive Patternmentioning

confidence: 99%

The ecology of Lerista labialis (Scincidae) in the Simpson Desert: reproduction and diet

Greenville¹,

Dickman²

2005

Journal of Arid Environments

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Section: Reproductive Patternmentioning

confidence: 99%

The ecology of Lerista labialis (Scincidae) in the Simpson Desert: reproduction and diet

Greenville¹,

Dickman²

2005

Journal of Arid Environments

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“…Although globally there is seasonal variation in the observed body temperatures, those registered in fall and winter were not statistically different when analyzed separately. During fall and winter, the temperatures registered in the dunes of Quintão were almost stable, demonstrating that the optimal body temperature of L. occipitalis can change seasonally according to alterations in the environmental heat sources (Mayhew, 1963;Pianka, 1971;Huey et al, 1977;Rocha, 1995).…”

Section: Discussionmentioning

confidence: 96%

“…In spite of a vast literature on reptile thermoregulation, not much has been demonstrated about seasonal variations of thermal patterns (Christian et al, 1983, Rocha, 1995. Some field studies have shown that optimal body temperature of lizards can change seasonally and that this change can be influenced by variations in the environmental heat sources (Mayhew, 1963;McGinnis, 1966;Mayhew & Weintraub, 1971;Pianka, 1971;Huey et al, 1977;Rocha, 1995).…”

Section: Discussionmentioning

confidence: 99%

The Influences of Habitat on Body Temperature Control in a Southern Population ofLiolaemus Occipitalis(Boulenger, 1885) in Brazil

Martins¹,

Verrastro

Tozetti

2014

South American Journal of Herpetology

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The thermal biology of the small sand lizard, Liolaemus occipitalis, was studied in the coastal sand dunes at Quintão Beach (Palmares do Sul, Rio Grande do Sul, Brazil; 30° 24' S and 50° 17' W), between September, 1998 and August, 1999. Liolaemus occipitalis presented a mean body temperature of 30.89 °C (SD = 4.43 °C; min = 16.4 °C; max = 40.2 °C; N = 270), that varied on a daily and seasonal basis according to microhabitat thermal alterations. The substrate temperature was the main heat source for thermoregulation of L. occipitalis as in all seasons of the year it was responsible for the animals´ temperature variation (82% of the collected lizards in the spring; 60% in the summer; 84% in the fall and 68% in the winter). The results indicate that L. occipitalis is a saxicolous, thigmothermic and heliothermic species that regulates its body temperature through behavioral mechanisms.Keywords: Tropiduridae, Liolaemus, thermal biology, body temperature, restingas. RESUMO Biologia termal de Liolaemus occipitalis (Squamata, Tropiduridae) nas dunas costeiras do Rio Grande do Sul, BrasilA biologia termal da lagartixa da areia, Liolaemus occipitalis, foi estudada nas dunas costeiras da Praia de Quintão (Palmares do Sul, Rio Grande do Sul, Brasil; 30° 24' S e 50° 17' W), entre setembro de 1998 e agosto de 1999. Liolaemus occipitalis apresentou temperatura corpórea média de 30,89 °C (SD = 4,43 °C; min = 16,4 °C; max = 40,2 °C; N = 270), a qual variou diária e sazonalmente relacionando-se às mudanças termais do microhábitat. A temperatura do substrato foi a fonte de calor de maior importância na termorregulação de L. occipitalis e, em todas as estações, foi responsável pela variação da temperatura dos animais (82% dos lagartos coletados na primavera; 60% no verão; 84% no outono; e 68% no inverno). Os resultados indicaram que L. occipitalis é uma espécie saxícola, tigmotérmica e heliotérmica, que regula sua temperatura corporal por meio de mecanismos comportamentais.Palavras-chave: Tropiduridae, Liolaemus, biologia termal, temperatura corporal, restingas.

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“…The frequency of occurrence was estimated as the number of stomachs in which a given prey item was found with respect to the total number of stomachs (individuals). Volume was estimated by measuring each item present in the stomach and applying the ellipsoid (spheroid) formula proposed by Mayhew (1963): V = 4/3 π ab 2 , where "a" is 1/2 of the larger length of the prey and "b" is 1/2 of the smaller larger. The volume percentages of each prey and the number of items consumed by each individual were also calculated.…”

Section: Methodsmentioning

confidence: 99%

Diet of the lizard Liolaemus occipitalis in the coastal sand dunes of southern Brazil (Squamata-Liolaemidae)

Verrastro

Ely

2015

Braz. J. Biol.

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Knowledge of a species' diet provides important information on adaptation and the relationship between the organism and its environment. The genus Liolaemus occurs in the southern region of South America and is an excellent model to investigate the adaptive processes of vertebrate ecology in ecosystems of this region of the world. Liolaemus occipitalis is an endangered species that inhabits the coastal sand dunes of southern Brazil. This species is the most abundant vertebrate in this environment, and it presents unique adaptation characteristics to the restinga environment. The present study analyzed this lizard's diet to verify similarities or differences between this species and other species of the same genus. Specimens were collected monthly from January 1996 to December 1997. The number of items, frequency of occurrence and volume of each prey taxon were determined. Arthropods were identified to the order level, and plant material was identified as flower, fruit, seed and leaves. Variations in the diet of males and females, adults and juveniles and seasons were also analyzed. The data indicate that Liolaemus occipitalis is a generalist, "sit-and-wait" or ambush predator as well as omnivorous, feeding on both arthropods and plant material. Significant ontogenetic differences were verified. Juveniles are more carnivorous, and the intake of plant material increases with size and age. Seasonal differences in diet composition were also observed. In the spring, arthropod and plant materials were more diversified and, therefore, consumed more often.Keywords: Liolaemus, southern Brazil, restinga, foraging, seasonal variation. Dieta do lagarto Liolaemus occipitalis nas dunas costerias do sul do Brasil(Squamata-Liolaemidae) ResumoO conhecimento sobre a dieta de uma espécie traz informações importantes sobre a adaptação e relações entre o organismo e seu ambiente. O gênero Liolaemus, que ocorre na região austral da América do Sul, tem-se mostrado como excelente modelo em ecologia de vetebrados para entender os processos adaptativos nos ecossistemas desta região do mundo. Liolaemus occipitalis é uma espécie ameaçada de extinção que habita as dunas costeiras do extremo sul do Brasil. É o vertebrado mais abundante neste ambiente e apresenta características peculiares de adaptação aos ambientes de restingas. No presente estudo analisou-se a dieta deste lagarto com o intuito de verificar se há diferenças com as espécies do gênero ou segue o mesmo padrão. Foram realizadas coletas mensais entre janeiro/96 e dezembro/97. Determinou-se o número de itens, a frequência de ocorrência e o volume de cada táxon de presa, identificados até o nível de ordem, no caso dos artrópodes, e como flor, fruto, semente e folhas o material vegetal. Foram analisadas as variações da dieta entre machos e fêmeas, entre adultos e jovens, e também entre as estações. Os dados indicam que Liolaemus occipitalis possui uma dieta onívora consumindo tanto artrópodes como material vegetal. Caracteriza-se por ser um predador generalista, forrageando ...

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Reproduction in the Granite Spiny Lizard, Sceloporus orcutti

Cited by 71 publications

References 8 publications

The ecology of Lerista labialis (Scincidae) in the Simpson Desert: reproduction and diet

The ecology of Lerista labialis (Scincidae) in the Simpson Desert: reproduction and diet

The Influences of Habitat on Body Temperature Control in a Southern Population ofLiolaemus Occipitalis(Boulenger, 1885) in Brazil

Diet of the lizard Liolaemus occipitalis in the coastal sand dunes of southern Brazil (Squamata-Liolaemidae)

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