Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/16942
Title: Extinction risks forced by climatic change and intraspecific variation in the thermal physiology of a tropical lizard
Authors: Pontes-da-Silva, Emerson
Magnusson, William Ernest
Sinervo, Barry R.
Caetano, Gabriel H.O.
Miles, Donald B.
Colli, Guarino R.
Diele-Viegas, Luisa Maria
Fenker, Jéssica
Santos, Juan Carlos
Werneck, F. P.
Keywords: Adult
Cladistics
Climate Change
Deforestation
Ecophysiology
Environmental Temperature
Greenhouse Effect
Heat Tolerance
Human
Intraspecific Variation
Lizard
Local Adaptation
Nonhuman
Physiology
Rainforest
Scrub
Acclimatization
Animals
Biological Model
Body Temperature
Female
Lizard
Locomotion
Male
Risk Factor
Species Extinction
Temperature
Tropic Climate
Acclimatization
Animal
Body Temperature
Extinction, Biological
Female
Global Warming
Lizards
Locomotion
Male
Models, Biological
Rainforest
Risk Factors
Temperature
Tropical Climate
Issue Date: 2018
metadata.dc.publisher.journal: Journal of Thermal Biology
metadata.dc.relation.ispartof: Volume 73, Pags. 50-60
Abstract: Temperature increases can impact biodiversity and predicting their effects is one of the main challenges facing global climate-change research. Ectotherms are sensitive to temperature change and, although predictions indicate that tropical species are highly vulnerable to global warming, they remain one of the least studied groups with respect to the extent of physiological variation and local extinction risks. We model the extinction risks for a tropical heliothermic teiid lizard (Kentropyx calcarata) integrating previously obtained information on intraspecific phylogeographic structure, eco-physiological traits and contemporary species distributions in the Amazon rainforest and its ecotone to the Cerrado savannah. We also investigated how thermal-biology traits vary throughout the species' geographic range and the consequences of such variation for lineage vulnerability. We show substantial variation in thermal tolerance of individuals among thermally distinct sites. Thermal critical limits were highly correlated with operative environmental temperatures. Our physiological/climatic model predicted relative extinction risks for local populations within clades of K. calcarata for 2050 ranging between 26.1% and 70.8%, while for 2070, extinction risks ranged from 52.8% to 92.8%. Our results support the hypothesis that tropical-lizard taxa are at high risk of local extinction caused by increasing temperatures. However, the thermo-physiological differences found across the species' distribution suggest that local adaptation may allow persistence of this tropical ectotherm in global warming scenarios. These results will serve as basis to further research to investigate the strength of local adaptation to climate change. Persistence of Kentropyx calcarata also depends on forest preservation, but the Amazon rainforest is currently under high deforestation rates. We argue that higher conservation priority is necessary so the Amazon rainforest can fulfill its capacity to absorb the impacts of temperature increase on tropical ectotherms during climate change. © 2018 Elsevier Ltd
metadata.dc.identifier.doi: 10.1016/j.jtherbio.2018.01.013
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