Seasonal Variation in Thermal Ecology and Microhabitat Use of Anolis carlliebi (Squamata: Dactyloidae) from a Xeric Scrubland in Central Mexico

2021 ◽  
Vol 109 (2) ◽  
Author(s):  
César A. Díaz-Marín ◽  
Ricardo Luría-Manzano ◽  
Guadalupe Gutiérrez-Mayén ◽  
Aurelio Ramírez-Bautista
Keyword(s):  
Seasonal Variation ◽  
Central Mexico ◽  
Microhabitat Use ◽  
Thermal Ecology

Thermal Ecology of Habitat and Microhabitat Use by Sympatric Varanus bengalensis and V. salvator in Sri Lanka

Copeia ◽  
1993 ◽  
Vol 1993 (3) ◽  
pp. 709 ◽  
Author(s):  
Eric D. Wikramanayake ◽  
Gil L. Dryden
Keyword(s):  
Sri Lanka ◽  
Microhabitat Use ◽  
Thermal Ecology

scholarly journals Thermal ecology of the federally endangered blunt-nosed leopard lizard (Gambelia sila)

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Kathleen N Ivey ◽  
Margaret Cornwall ◽  
Hayley Crowell ◽  
Nargol Ghazian ◽  
Emmeleia Nix ◽  
...  
Keyword(s):  
Climate Change ◽  
Endangered Species ◽  
Thermal Tolerance ◽  
Microhabitat Use ◽  
Thermal Ecology ◽  
Body Temperatures ◽  
Ambient Temperatures ◽  
Open Habitat ◽  
Kangaroo Rat ◽  
Upper Thermal Tolerance

Abstract Recognizing how climate change will impact populations can aid in making decisions about approaches for conservation of endangered species. The blunt-nosed leopard lizard (Gambelia sila) is a federally endangered species that, despite protection, remains in extremely arid, hot areas and may be at risk of extirpation due to climate change. We collected data on the field-active body temperatures, preferred body temperatures and upper thermal tolerance of G. sila. We then described available thermal habitat using biophysical models, which allowed us to (i) describe patterns in lizard body temperatures, microhabitat temperatures and lizard microhabitat use; (ii) quantify the lizards’ thermoregulatory accuracy; (iii) calculate the number of hours they are currently thermally restricted in microhabitat use; (iv) project how the number of restricted hours will change in the future as ambient temperatures rise; and (v) assess the importance of giant kangaroo rat burrows and shade-providing shrubs in the current and projected future thermal ecology of G. sila. Lizards maintained fairly consistent daytime body temperatures over the course of the active season, and use of burrows and shrubs increased as the season progressed and ambient temperatures rose. During the hottest part of the year, lizards shuttled among kangaroo rat burrows, shrubs, and open habitat to maintain body temperatures below their upper thermal tolerance, but, occasionally, higher than their preferred body temperature range. Lizards are restricted from staying in the open habitat for 75% of daylight hours and are forced to seek refuge under shrubs or burrows to avoid surpassing their upper thermal threshold. After applying climatic projections of 1 and 2°C increases to 2018 ambient temperatures, G. sila will lose additional hours of activity time that could compound stressors faced by this population, potentially leading to extirpation.

How morphology and thermal ecology relates to diurnal microhabitat use and selection across seasons in two habitats of the nocturnal Tarentola delalandii from Tenerife

2019 ◽  
Vol 40 (4) ◽  
pp. 487-498
Author(s):  
María de Fuentes-Fernández ◽  
Ma Mercedes Suárez-Rancel ◽  
Miguel Molina-Borja
Keyword(s):  
Body Size ◽  
Microhabitat Use ◽  
Thermal Ecology ◽  
Adult Males ◽  
Selective Pressures ◽  
Microhabitat Choice ◽  
Body Sizes ◽  
Contrasting Habitats ◽  
Lower Temperature ◽  
Relationship Of

Abstract Many selective pressures modulate microhabitat choice of ectotherms, such as temperature, humidity and habitat heterogeneity, and these vary in space and time. Here we analysed: 1) microhabitat selection comparing characteristics of stones (and their surroundings) under which geckos (Tarentola delalandii, mainly nocturnal) were found during the day with that of stones selected randomly; 2) relationship of a measure of body size to microhabitat characteristics (stone and herb covers, etc., and temperature/humidity) and cloacal temperature of males, females and juveniles from two contrasting habitats of Tenerife (northern and southern localities) and in two periods of the year (Spring-Summer and Autumn-Winter). In comparison with randomly selected stones, geckos significantly selected stones with lower temperature in the Spring-Summer and microhabitats with high stone cover. Gecko size was significantly larger in the Northern than in the Southern locality, in spring – summer than in autumn – winter and in males than in females. In both populations and time periods, the largest body sizes were significantly associated with higher environmental and shelter temperatures and with low values of humidity and stone cover. Cloacal and shelter temperatures were positively and significantly related; at higher values of the latter, juveniles attained significantly higher temperatures than adult males but lower than that of females. Larger body size was associated with high shrub and leaf litter covers and high values of shelter dimensions. Therefore, we suggest that in relation to their body sizes, geckos seem to select their shelters considering specific microhabitat characteristics surrounding them that may provide thermoregulatory and/or antipredator profits.

Ultrastructure of the effect of T-514 obtained from Karwinskia humboldtiana on assembly and integrity of yeast's peroxisomes

1991 ◽  
Vol 49 ◽  
pp. 136-137
Author(s):  
J. Sepulveda-Saavedra ◽  
I. Vander-Klei ◽  
M. Venhuis ◽  
Y. Piñeyro-Lopez
Keyword(s):  
Culture Conditions ◽  
Toxic Effects ◽  
Candida Boidinii ◽  
Central Mexico ◽  
Poisonous Plant ◽  
Biological Behaviour ◽  
Enzyme Content ◽  
Fat Deposits ◽  
Yeast Model

Karwinskia humboldtiana is a poisonous plant that grows in semi desertic areas in north and central México. It produces several substances with different toxic effects. One of them designated T-514 damages severely the lung, kidney and liver, producing in the hepatoeyte large intracellular fat deposits and necrosis. Preliminary observations demonstrated that three is a decrease in the amount of peroxisomes in the hepatocytes of experimentally intoxicated rats and monkeys. To study the effect exerted by the T-514 on peroxisomes, a yeast model was selected, thus, three species: Saccha romices cerevisiae, Ilansenula polymorpha and Candida boidinii were used, because there is information concerning their peroxisome's morphology, enzyme content, biological behaviour under different culture conditions and biogenesis.

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