Hibernation and emergence pattern of<i>Tupinambis merianae</i>(Squamata: Teiidae) in the Taim Ecological Station, southern Brazil

Winck, Gisele R.; Cechin, Sônia Zanini

doi:10.1080/00222930701828667

Cited by 25 publications

(22 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These artificial burrows resemble refuges used in nature; tegus choose to hibernate in concrete, man-made structures (such as under houses) as opposed to under rocks (Winck and Cechin 2008). Over the top of the burrows were pyramidal lids (60 cm × 80 cm base, 1 m height) constructed of plywood and internally insulated with 2 cm thick Styrofoam insulation.…”

Section: Study Enclosuresmentioning

confidence: 99%

Daily and annual cycles in thermoregulatory behaviour and cardio-respiratory physiology of black and white tegu lizards

et al. 2015

View full text Add to dashboard Cite

This study was designed to determine the manner in which metabolism is suppressed during dormancy in black and white tegu lizards (Tupinambis merianae). To this end, heart rate (fH), respiration rate (fR), and deep body temperature (Tb) were continuously monitored in outdoor enclosures by radio-telemetry for nine months. There was a continuous decline in nighttime breathing and heart rate, at constant Tb, throughout the late summer and fall suggestive of an active metabolic suppression that developed progressively at night preceding the entrance into dormancy. During the day, however, the tegus still emerged to bask. In May, when the tegus made a behavioural commitment to dormancy, Tb (day and night) fell to match burrow temperature, accompanied by a further reduction in fH and fR. Tegus, under the conditions of this study, did arouse periodically during dormancy. There was a complex interplay between changes in fH and Tb associated with the direct effects of temperature and the indirect effects of thermoregulation, activity, and changes in metabolism. This interplay gave rise to a daily hysteresis in the fH/Tb relationship reflective of the physiological changes associated with warming and cooling as preferred Tb alternated between daytime and nighttime levels. The shape of the hysteresis curve varied with season along with changes in metabolic state and daytime and nighttime body temperature preferences.

show abstract

Section: Study Enclosuresmentioning

confidence: 99%

Daily and annual cycles in thermoregulatory behaviour and cardio-respiratory physiology of black and white tegu lizards

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The variation in the annual thermal amplitude and the hours of sunlight can determine an aestivation period for many species (Mayhew 1961, Licht 1973. This was recently recorded in the Brazilian subtropical region for Teius oculatus (Cappellari 2005) and Tupinambis merianae (Winck and Cechin 2008). We verified through similarity and regression analyses that the species from this Pampean lizard assemblage differed in patterns of temporal distribution.…”

Section: Discussionmentioning

confidence: 69%

“…For lizards, Waldschmidt and Tracy (1983) also recorded that temperature influenced the temporal distribution of Uta stansburiana in a temperate area of the northern hemisphere. Regarding studies in the Brazilian subtropical zone, Winck and Cechin (2008) and Winck et al (in press) show temperature as one of the limit factors for the activity of Tupinambis merianae in the southern Rio Grande do Sul State, Brazil. Most information on the activity of Brazilian lizards was acquired in tropical areas, focusing on a single species (e.g., Van Sluys and Rocha 1999, Zaluar and Rocha 2000, Peloso et al 2008.…”

Section: Introductionmentioning

confidence: 99%

Pampean lizard assemblage from subtropical Brazil: a temporal analysis

Winck

Santos

Cechin

2011

An. Acad. Bras. Ciênc.

Self Cite

View full text Add to dashboard Cite

The increasing human occupation of natural environments is one of the greatest threats to biodiversity. To mitigate the negative anthropogenic effects, it is necessary to understand the characteristics of natural populations and the natural history of species. A study was conducted with an assemblage of lizards from a disturbed area of the Pampa biome, from February 2001 to January 2004. The assemblage showed a unimodal seasonal pattern, with the recruitment period occurring during the warmer months. The captures were seasonal for two of the three monitored years, and concentrated within warmer months. The minimum temperature explained the number of catches for the assemblage as a whole. However, when the species were analyzed individually, the temperature only explained the seasonal occurrence of Teius oculatus. The abundance of species was significantly different in the third year of study for Cercosaura schreibersii and Ophiodes striatus. This latter species was no longer registered in the study area from May 2003 until the end of the study. Therefore, O. striatus may be more sensitive to environmental changes, considering the events of change in vegetation during the study. With frequent and increasing environmental disturbances, it is necessary to take conservation measures and encourage the increase of knowledge on Pampean lizards.

show abstract

“…Minimum temperatures might have a limiting role in their environmental niche as it does for other ectothermic species (Boretto and Ibargüengoytía, 2009;Anadón et al, 2012). Environmental temperature influences key processes in Tupinambis spp., such as basking in males before territorial demarcation for reproduction and basking in females; the latter determines the critical temperatures reached in nests because females transfer heat from basking to the eggs through body contact (Manes et al, 2003;Winck and Cechin, 2008). Mass and volume of Tupinambis spp.…”

Section: Discussionmentioning

confidence: 98%

Understanding the ecological niche to elucidate spatial strategies of the southernmost Tupinambis lizards

et al. 2013

View full text Add to dashboard Cite

Understanding factors that shape ranges of species is central in evolutionary biology. Species distribution models have become important tools to test biogeographical, ecological and evolutionary hypotheses. Moreover, from an ecological and evolutionary perspective, these models help to elucidate the spatial strategies of species at a regional scale. We modelled species distributions of two phylogenetically, geographically and ecologically close Tupinambis species (Teiidae) that occupy the southernmost area of the genus distribution in South America. We hypothesized that similarities between these species might have induced spatial strategies at the species level, such as niche differentiation and divergence of distribution patterns at a regional scale. Using logistic regression and MaxEnt we obtained species distribution models that revealed interspecific differences in habitat requirements, such as environmental temperature, precipitation and altitude. Moreover, the models obtained suggest that although the ecological niches of Tupinambis merianae and T. rufescens are different, these species might co-occur in a large contact zone. We propose that niche plasticity could be the mechanism enabling their co-occurrence. Therefore, the approach used here allowed us to understand the spatial strategies of two Tupinambis lizards at a regional scale.

show abstract

Hibernation and emergence pattern ofTupinambis merianae(Squamata: Teiidae) in the Taim Ecological Station, southern Brazil

Cited by 25 publications

References 23 publications

Daily and annual cycles in thermoregulatory behaviour and cardio-respiratory physiology of black and white tegu lizards

Daily and annual cycles in thermoregulatory behaviour and cardio-respiratory physiology of black and white tegu lizards

Pampean lizard assemblage from subtropical Brazil: a temporal analysis

Understanding the ecological niche to elucidate spatial strategies of the southernmost Tupinambis lizards

Contact Info

Product

Resources

About