Dataset Information

Running performance with emphasis on low temperatures in a Patagonian lizard, Liolaemus lineomaculatus.

ABSTRACT: Lizard activity and endurance of cold climate is regulated by several factors such as evolutionary potential, acclimatization capacity, physiological tolerance, and locomotion among thermally advantageous microenvironments. Liolaemus lineomaculatus, a lizard inhabiting a wide range of cold environments in Patagonia, provides an excellent model to test interpopulation variability in thermal performance curves (TPCs) and usage of microhabitats. We obtained critical thermal minima and maxima, and performed running trials at eight temperatures using lizards from both a temperate-site (high-altitude) population at 42° S and a cold-site population at 50° S. The availability of environmental temperatures for running performance in open ground and in potential lizard refuges were recorded, and showed that lizards in the temperate site had a greater availability of thermal environments offering temperatures conducive to locomotion. Generalized additive mixed models showed that the two populations displayed TPCs of different shapes in 0.15 m runs at temperatures near their optimal temperature, indicating a difference in thermal sensitivity at high temperatures. However, the rest of the locomotor parameters remained similar between Liolaemus lineomaculatus from thermal and ecological extremes of their geographic distribution and this may partly explain their ability to endure a cold climate.

SUBMITTER: Cecchetto NR

PROVIDER: S-EPMC7477221 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature

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Running performance with emphasis on low temperatures in a Patagonian lizard, Liolaemus lineomaculatus.

Cecchetto N R NR Medina S M SM Ibargüengoytía N R NR

Scientific reports 20200907 1

Lizard activity and endurance of cold climate is regulated by several factors such as evolutionary potential, acclimatization capacity, physiological tolerance, and locomotion among thermally advantageous microenvironments. Liolaemus lineomaculatus, a lizard inhabiting a wide range of cold environments in Patagonia, provides an excellent model to test interpopulation variability in thermal performance curves (TPCs) and usage of microhabitats. We obtained critical thermal minima and maxima, and p ...[more]

PMID: 32895421

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Project description:High-latitude lizards are capable of activity at low winter temperatures and are active on warm nights (including in winter) with prior warmer temperatures during the day, with active field body temperature as low as 1.4#x00B0;C and air temperature less than 1#x00B0;C. Abstract High-latitude lizards live in environments where ambient air temperature at night is frequently below retreat temperatures, which likely has implications for nocturnal emergence and activity. However, patterns of lizard activity at night under current temperate climates are poorly understood, a situation that limits our understanding of potential effects of climate change. We investigated patterns of nocturnal emergence and activity in the cold-adapted, viviparous gecko (Woodworthia ‘Otago/Southland’). We measured operative environmental temperature (Te) available to geckos that emerged at night and simultaneously assessed nighttime emergence activity using time-lapse trail cameras. Also, we assessed field body temperature (Tb) of emerged geckos of various life history groups at night using thermography to understand how current weather conditions affect field Tb of emerged geckos. Our results show that Te, nocturnal emergence activity and field-active Tb increased with nighttime air temperature. Nocturnal emergence was highest in spring and summer but also occurred in autumn and (unexpectedly) in winter. Geckos were active over a broad range of Tb down to 1.4°C (a new record low for lizards) and on rock surfaces typically warmer than air temperature or Tb. We conclude that this nocturnal, high-latitude lizard from the temperate zone is capable of activity at low winter temperatures, but that current climate limits emergence and activity at least in autumn and winter. Activity levels for cool-temperate reptiles will probably increase initially as climates warm, but the consequences of increased nocturnal activity under climate change will probably depend on how climate change affects predator populations as well as the focal species’ biology.

Dataset Information

Running performance with emphasis on low temperatures in a Patagonian lizard, Liolaemus lineomaculatus.

Publications

Running performance with emphasis on low temperatures in a Patagonian lizard, Liolaemus lineomaculatus.

Similar Datasets

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