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Thermal heterogeneity of selected retreats in cool-temperate viviparous lizards suggests a potential benefit of future climate warming.

التفاصيل البيبلوغرافية
العنوان: Thermal heterogeneity of selected retreats in cool-temperate viviparous lizards suggests a potential benefit of future climate warming.
المؤلفون: Chukwuka CO; Department of Zoology, University of Otago, Dunedin, 9016, New Zealand; Department of Biology, Alex Ekwueme Federal University, Ndufu-Alike Ikwo, Ebonyi State, Nigeria. Electronic address: christian.chukwuka@otago.ac.nz., Mello RSR; Department of Zoology, University of Otago, Dunedin, 9016, New Zealand., Cree A; Department of Zoology, University of Otago, Dunedin, 9016, New Zealand., Monks JM; Department of Zoology, University of Otago, Dunedin, 9016, New Zealand; Biodiversity Group, Department of Conservation, Dunedin, 9058, New Zealand.
المصدر: Journal of thermal biology [J Therm Biol] 2021 Apr; Vol. 97, pp. 102869. Date of Electronic Publication: 2021 Feb 09.
نوع المنشور: Journal Article
اللغة: English
بيانات الدورية: Publisher: Pergamon Press Country of Publication: England NLM ID: 7600115 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 0306-4565 (Print) Linking ISSN: 03064565 NLM ISO Abbreviation: J Therm Biol Subsets: MEDLINE
أسماء مطبوعة: Original Publication: Oxford, New York, Pergamon Press.
مواضيع طبية MeSH: Body Temperature Regulation* , Climate Change* , Microclimate* , Temperature*, Lizards/*physiology, Animals ; Female ; Male ; New Zealand
مستخلص: Rocky retreats are limited and geologically constrained resources for rock-dwelling nocturnal lizards. Such lizards should seek retreats that offer thermoregulatory benefits without the risk of overheating during the day, and that protect from predation. For cold-adapted species where air temperature is frequently lower than optimum temperature for performance, factors influencing retreat-site selection and whether future warmer conditions will force superficial rock slabs to be abandoned on hot days remain poorly known. Here, we predicted that retreats selected by a nocturnally foraging, cool-temperate gecko from southern New Zealand would be thermally heterogeneous and that future warmer temperature will force lizards to abandon daytime retreats on hot days. We sampled loose rock slabs (potential retreats) in a tussock-grassland site in all seasons. We measured seasonal rock temperature profiles and field body temperature (T b ) of captured geckos using thermography and quantified the physical characteristics of each potential retreat. We found that both physical characteristics and rock temperatures determine choice of retreats. Field T b of lizards positively correlated with retreat and air temperatures. Also, retreat temperatures, including those of the substrate below the rock slabs, showed complex heterogeneity enabling lizards to choose microsites within retreats to achieve preferred body temperatures intermittently. Observed seasonal shifts in characteristics of occupied rocks imply that lizards choose retreats to maximise warmth in spring, minimise risk of overheating (remain below voluntary thermal maximum, VT max ) in summer and avoid freezing over winter. Our study demonstrates the importance of microclimatic conditions in influencing retreat-site selection. Climate warming might lead to seasonal changes in use of rock slabs and possibly be beneficial initially, but longer-term implications need to be examined.
(Copyright © 2021 Elsevier Ltd. All rights reserved.)
فهرسة مساهمة: Keywords: Field-body temperature; Microclimate; Nocturnal lizard; Retreat-site selection; Thermogram
تواريخ الأحداث: Date Created: 20210417 Date Completed: 20211112 Latest Revision: 20211112
رمز التحديث: 20221213
DOI: 10.1016/j.jtherbio.2021.102869
PMID: 33863433
قاعدة البيانات: MEDLINE
الوصف
تدمد:0306-4565
DOI:10.1016/j.jtherbio.2021.102869