The Influences of Habitat on Body Temperature Control in a Southern Population of<i>Liolaemus Occipitalis</i>(Boulenger, 1885) in Brazil

Martins, Laís S.; Verrastro, Laura; Tozetti, Alexandro Marques

doi:10.2994/sajh-d-13-00025.1

Cited by 11 publications

(3 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Temperature plays an important role in various aspects of the life history and physiology of ectotherms (Angilletta et al, 2004;Clarke and Pörtner, 2010;Iungman and Piña, 2013;Martins et al, 2014). In wild geckos, basal corticosterone was positively correlated with body temperature (Cree et al, 2003).…”

Section: Discussionmentioning

confidence: 99%

Corticosterone Plasma Levels of Embryo and Hatchling Broad-Snouted Caimans (Caiman latirostris) Incubated at Different Temperatures

Marcó

Piña

Somoza

et al. 2015

South American Journal of Herpetology

View full text Add to dashboard Cite

The temperature-sensitive period is the time during development during which sex determination occurs in vertebrates that undergo temperature-dependent sex determination, such as in caimans. The interplay among temperature and steroid hormones is also known, and it has been suggested that stress hormones (corticosterone) might influence sex ratios in some reptiles. To explore this, we measured the levels of corticosterone in Caiman latirostris to determine if incubation temperature (31°C, 33°C, and 34°C) affects plasma corticosterone levels. Differences among nests were observed in plasma corticosterone. However, hormone levels showed no significant differences between sexes or incubation temperatures in Caiman latirostris embryos or hatchlings. Corticosterone levels were 0.01-2.2 ng/ mL in embryos incubated at 31°C (100% of females), 0.01-4.65 ng/mL in those incubated at 33°C (100% of males), and 0.01-6.31 ng/mL in embryos incubated at 34°C (100% of males). Corticosterone levels were higher in hatchlings, being 1.11-39.18 in those produced at 31°C, 2.85-22.36 at 33°C, and 2.72-39.05 ng/mL at 34°C.

show abstract

Section: Discussionmentioning

confidence: 99%

Corticosterone Plasma Levels of Embryo and Hatchling Broad-Snouted Caimans (Caiman latirostris) Incubated at Different Temperatures

Marcó

Piña

Somoza

et al. 2015

South American Journal of Herpetology

View full text Add to dashboard Cite

show abstract

“…Other activities performed by anurans, such as dispersion, migration, or foraging, also appear to respond primarily to climatic variables. A wide range of methods are currently available for evaluating anuran activity, and the capture rate is the most frequently used indicator of general activity (Oliveira et al 2013;Martins et al 2014). Indeed, capture rate is an indirect measure of any activity performed by animals on the surface of a substrate (e.g., foraging, habitat exploration, dispersal, and migrations), as such activities increase their capture probability.…”

Section: Introductionmentioning

confidence: 99%

Seasonality in anuran activity and calling season in a Brazilian subtemperate wetland

Ximenez

Tozetti

2015

Zool. Stud.

View full text Add to dashboard Cite

Background: Most tropical regions have a climate characterized by marked seasonal rainfall patterns, and these seasonal patterns of rainfall directly affect anuran activity. However, in regions with temperate climates, the main aspect of climate related to anuran activity is the thermal regime. Thus, transitional climate regions represent good opportunities to study the effect of abiotic factors on anuran activity. In this study, we present new data on the activity pattern and calling season of Neotropical anurans in a subtemperate climate. Anuran activity was assessed based on the rate of capture of specimens in pitfall traps and calling surveys. The field study was conducted between May 2010 and April 2011 in wetlands in southernmost Brazil. Results: An analysis based on directional (circular) statistics showed that general activity in the studied anurans was significantly seasonal. In addition, the general activity pattern of most species was regulated by temperature, not by rainfall, and approached that observed in regions with a temperate climate. However, we did not record a well-defined peak in the number of species displaying calling activity. This parameter did not exhibit any influence of temperature variations or rainfall. Conclusions: The observed general activity pattern is different from that expected for the majority of anurans inhabiting eastern South America. The present study showed that the general activity patterns of most anurans in the wetland region in southernmost Brazil are regulated by temperature and not rainfall, similar to the pattern of anuran assemblies from temperate climates. However, the nonexistence of a significant relationship between calling activity and any of the environmental variables tested suggests the presence of a different environmental factor (e.g., photoperiod or the length of the hydroperiod of the relevant water bodies) as a trigger for the levels of general calling activity.

show abstract

“…Although the differences between mean body and air temperatures do not provide evidence for thermoregulation (see Heath 1964), many researchers have applied these data, including recently (e.g. Martins et al 2014). However, it is interesting to understand the general patterns of different variables affecting this effect size, as this has been traditionally a proxy for thermoregulation and is still in use in macroecological research.…”

Section: Data Extractionmentioning

confidence: 99%

Main factors affecting lacertid lizard thermal ecology

Ortega

Martín-Vallejo

2019

Integrative Zoology

View full text Add to dashboard Cite

The thermal ecology of ectotherms has been studied for almost 2 centuries, but additional attention is currently being paid to it, to understand how organisms deal with the environment in a climate change context. A consensus is still far away due to the large number of factors involved and their complex interactions. In this context, 3 analyses in lacertid lizards were carried out: (i) a meta-analysis, to test for differences between body and air temperatures from 71 populations; (ii) a meta-analysis concerning correlations between body and air temperatures from 60 populations; and (iii) a multimodel inference of thermoregulation effectiveness indices from 45 populations. The importance of different factors, including body size, habitat, insularity, altitude, climate and season, was evaluated in all analyses to model the response variables. A strong seasonality effect was observed, with a consistent pattern of less effective thermoregulation in summer compared to other seasons. Altitude was the second most important factor, with a consistent higher thermoregulation effort in populations occurring at high elevations (>1000 m above sea level). Other factors, such as insularity or body size, can also be important, but did not exhibit a clear pattern. Finally, thermoregulation was less affected by climate and habitat type.

show abstract

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

Cited by 11 publications

References 53 publications

Corticosterone Plasma Levels of Embryo and Hatchling Broad-Snouted Caimans (Caiman latirostris) Incubated at Different Temperatures

Corticosterone Plasma Levels of Embryo and Hatchling Broad-Snouted Caimans (Caiman latirostris) Incubated at Different Temperatures

Seasonality in anuran activity and calling season in a Brazilian subtemperate wetland

Main factors affecting lacertid lizard thermal ecology

Contact Info

Product

Resources

About