Seasonal variations in behaviour of thermoregulation in juveniles and adults Liolaemus lutzae (Squamata, Liolaemidae) in a remnant of Brazilian restinga

Maia-Carneiro, Thiago; Rocha, Carlos Frederico Duarte

doi:10.1016/j.beproc.2013.08.001

Cited by 23 publications

(7 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thermophysiological studies on temperate Andean lizards, which presumably have analogous thermophysiological traits to tropical Andean lizards, have revealed interesting thermophysiological patterns. For example, thermoregulatory strategies of Liolaemus species may rely on both air and substrate temperature [22,23], and also swapping between shaded areas and sites exposed to direct sunlight [24]. Moreover, it has been debated whether the body (field) temperature of this group of lizards is driven by a labile evolution in which the environmental thermal gradient causes a directional selection, or it responds to the phylogeny and thus thermal physiology is evolutionarily conservative [22,23,24,25,26,27,28].…”

Section: Introductionmentioning

confidence: 99%

Thermal biology of two tropical lizards from the Ecuadorian Andes and their vulnerability to climate change

et al. 2020

View full text Add to dashboard Cite

This study aims to analyze the thermal biology and climatic vulnerability of two closely related lizard species (Stenocercus festae and S. guentheri) inhabiting the Ecuadorian Andes at high altitudes. Four physiological parameters-body temperature (T b), preferred temperature (T pref), critical thermal maximum (CT max), and critical thermal minimum (CT min)-were evaluated to analyze the variation of thermophysiological traits among these populations that inhabit different environmental and altitudinal conditions. We also evaluate the availability of operative temperatures, warming tolerance, and thermal safety margin of each population to estimate their possible risks in the face of future raising temperatures. Similar to previous studies, our results suggest that some physiological traits (CT max and T b) are influenced by environmental heterogeneity, which brings changes on the thermoregulatory behavior. Other parameters (T pref and CT min), may be also influenced by phylogenetic constraints. Moreover, the fluctuating air temperature (T air) as well as the operative temperatures (T e) showed that these lizards exploit a variety of thermal microenvironments, which may facilitate behavioral thermoregulation. Warming tolerance and thermal safety margin analyses suggest that both species find thermal refugia and remain active without reducing their performance or undergoing thermal stress within their habitats. We suggest that studies on the thermal biology of tropical Andean lizards living at high altitudes are extremely important as these environments exhibit a unique diversity of microclimates, which consequently result on particular thermophysiological adaptations.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermal biology of two tropical lizards from the Ecuadorian Andes and their vulnerability to climate change

et al. 2020

View full text Add to dashboard Cite

show abstract

“…According to Sartorius et al (2002), xeric shrublands in deserts are ideal for lizard thermoregulation because the spatial scale of thermal variation is often small and movements between macrohabitats are not required to change thermal status. Also, specifically sand lizards select partially shaded sites in the warmest periods of the day and adopted raised postures to promote heat loss via air movement, in contrast to other species that move from open to shady areas to avoid overheating in the warmer periods of the day (Bujes and Verrastro 2008;Block et al 2013;Maia-Carneiro and Rocha 2013). In this sense, for L. cuyumhue, the thermoregulatory behaviour and the use of microhabitats, specifically shaded ones, are the only way they could buffer the stressful conditions of the low thermal quality environment that they inhabit.…”

Section: Discussionmentioning

confidence: 99%

Vulnerability to global warming of the critically endangered Añelo Sand Dunes Lizard (Liolaemus cuyumhue) from the Monte Desert, Patagonia Argentina

et al. 2021

View full text Add to dashboard Cite

Reptiles’ body temperature is strongly influenced by the thermal quality of microhabitats, exploiting the favourable environmental temperatures, and avoiding exposure to extreme thermal conditions. For these reasons, reptiles’ populations are considered to be especially vulnerable to changes in environmental temperatures produced by climate change. Here, we study the thermal physiology of the Critically Endangered lizard Liolaemus cuyumhue Avila, Morando, Perez and Sites, 2009. We hypothesise that, (1) there is a thermal coadaptation between optimal temperature for locomotor performance of L. cuyumhue and its thermal preference; (2) L. cuyumhue lives in an environment with low thermal quality; (3) a raise in environmental temperatures due to global warming will impose a decrement in locomotor speed represented by lower warming tolerance and narrower thermal safety margins, increasing their already high vulnerability. We registered field body temperatures (Tb), preferred body temperatures (Tpref), the operative (Te), and the thermal sensitivity of locomotion at different body temperatures. Our results indicate that this lizard is not currently under environmental stress or exceeding its thermal limits, but that it is thermorregulating below Tpref to avoid overheating, and that an increase in environmental temperature higher than 3.5 °C will strongly affect the use of microhabitats with direct sun exposure.

show abstract

“…As a result, L. lutzae was categorized on the Brazilian List of Threatened Fauna (MMA, 2022) and on the IUCN Red List of Threatened Species (IUCN, 2021) as 'Critically Endangered' (CR). Most studies on L. lutzae have focused on ecological aspects such as thermal ecology (Maia-Carneiro & Rocha, 2013a, 2013bRocha, 1995a), diet (Rocha, 1989(Rocha, , 1996a(Rocha, , 2000, habitat use and activity (Rocha, 1988(Rocha, , 1991, reproductive aspects (Rocha, 1990(Rocha, , 1992(Rocha, , 1996b, body growth (Rocha, 1995b), endoparasitism (Rocha, 1995c), defence mechanisms (Rocha, 1993) and conservation (e.g., Rocha, 1985;Rocha et al, 2009aRocha et al, , 2009bRocha & Bergallo, 1992).…”

Section: Introductionmentioning

confidence: 99%

Occupancy and detectability of a critically threatened lizard endemic from sandy coastal plains areas of Rio de Janeiro State, Brazil

Proença‐Gomes,

Pereira‐Ribeiro,

Siqueira

et al. 2024

Austral Ecology

View full text Add to dashboard Cite

Liolaemus lutzae is a small liolaemid lizard critically endangered and restricted to coastal restinga (salty sand dune habitats covered by herbaceous and shrubby vegetation by seaside) habitats of the state of Rio de Janeiro in Brazil. This lizard has been predicted to be extinct by 2080. We studied some of the environmental factors that influence occupancy by the species and detectability by the observer, in addition to investigating which populations remain occupying the areas along its original geographical distribution. We sampled 25 different beach habitats of restinga areas in the state, by 100‐meter replicates of linear transects. The estimated probability of occupancy was 69% (0.69 ± 0.05), and the estimated detectability was 50% (0.50 ± 0.03). The detection model with the best fit contained only the air temperature variable. Occupancy was best described by four variables: number of disturbance sources on the transect, vegetation cover in a 50‐meter buffer, exposed sand cover substrate in a 20‐meter buffer, and built‐up area cover in a 50‐meter buffer. No observations of L. lutzae were made in eight of the 25 restinga areas sampled along the original distribution of the lizard. In seven of these areas, the species had its populations extirpated many years ago, based on the 2007/2008 monitoring data. Conversely, in one area where the species was frequently observed during field surveys and different ecological studies on the species made in last decade, it was not recorded in the present study, indicating a possible recent population extirpation. We recommend that conservation measures be urgently implemented to mitigate anthropogenic impacts on the areas of the remaining populations of this lizard throughout its range, especially preserving the structure and functions of the remaining vegetation of beach habitat along restinga areas.

show abstract

Seasonal variations in behaviour of thermoregulation in juveniles and adults Liolaemus lutzae (Squamata, Liolaemidae) in a remnant of Brazilian restinga

Cited by 23 publications

References 32 publications

Thermal biology of two tropical lizards from the Ecuadorian Andes and their vulnerability to climate change

Thermal biology of two tropical lizards from the Ecuadorian Andes and their vulnerability to climate change

Vulnerability to global warming of the critically endangered Añelo Sand Dunes Lizard (Liolaemus cuyumhue) from the Monte Desert, Patagonia Argentina

Occupancy and detectability of a critically threatened lizard endemic from sandy coastal plains areas of Rio de Janeiro State, Brazil

Contact Info

Product

Resources

About