Biologging subcutaneous temperatures to detect orientation to solar radiation remotely in savanna antelope

Arista Botha, Hilary M. Lease, Andrea Fuller, Duncan Mitchell, Robyn S. Hetem

Research output: Contribution to journalArticle

Abstract

Observations of animal thermoregulatory behavior are labor-intensive, and human presence may disturb the normal behavior of the animal. Therefore, we investigated whether a remote biologging technique could be used to detect orientation to solar radiation in savanna antelope. We predicted that when a mammal was orientated perpendicular to solar radiation, the subcutaneous temperature on the side of the body facing the sun would be greater than that on the opposite side, whereas when the mammal was orientated parallel to solar radiation, subcutaneous temperatures on both sides would be similar. A pilot study showed that the difference between left- and right-side temperatures under a pelt reflected orientation to solar radiation if a pelt-covered cylinder had been orientated for 15 min or longer. In addition, the rate of change in temperature difference could detect orientation that had changed within the previous 5 min. We implanted temperature-sensitive data loggers subcutaneously into the flanks of eight black (Connochaetes gnu) and eight blue (Connochaetes taurinus) wildebeest. By incorporating both the rate of change and subcutaneous temperature differences and excluding times when wildebeest were lying down, our predictions correctly matched behavioral observations of wildebeest orientation to solar radiation 71% of the time. Our technique tended to fail when wildebeest were lying down, wind speeds were high and the sun was overhead. But those are conditions in which the benefits of manipulating orientation to solar radiation is of diminishing importance to a free-living mammal. Therefore, subcutaneous temperatures provide physiologically relevant information on the importance of solar radiation to mammals.

Original languageEnglish
Pages (from-to)267-279
Number of pages13
JournalJournal of Experimental Zoology Part A: Ecological and Integrative Physiology
Volume331
Issue number5
DOIs
Publication statusPublished - 1 Jun 2019

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Antelopes
antelopes
wildebeest
savanna
savannas
solar radiation
Radiation
Temperature
Mammals
mammal
Connochaetes
temperature
mammals
furs and pelts
Animal Behavior
Solar System
animal behavior
Grassland
wind speed
labor

Cite this

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title = "Biologging subcutaneous temperatures to detect orientation to solar radiation remotely in savanna antelope",
abstract = "Observations of animal thermoregulatory behavior are labor-intensive, and human presence may disturb the normal behavior of the animal. Therefore, we investigated whether a remote biologging technique could be used to detect orientation to solar radiation in savanna antelope. We predicted that when a mammal was orientated perpendicular to solar radiation, the subcutaneous temperature on the side of the body facing the sun would be greater than that on the opposite side, whereas when the mammal was orientated parallel to solar radiation, subcutaneous temperatures on both sides would be similar. A pilot study showed that the difference between left- and right-side temperatures under a pelt reflected orientation to solar radiation if a pelt-covered cylinder had been orientated for 15 min or longer. In addition, the rate of change in temperature difference could detect orientation that had changed within the previous 5 min. We implanted temperature-sensitive data loggers subcutaneously into the flanks of eight black (Connochaetes gnu) and eight blue (Connochaetes taurinus) wildebeest. By incorporating both the rate of change and subcutaneous temperature differences and excluding times when wildebeest were lying down, our predictions correctly matched behavioral observations of wildebeest orientation to solar radiation 71{\%} of the time. Our technique tended to fail when wildebeest were lying down, wind speeds were high and the sun was overhead. But those are conditions in which the benefits of manipulating orientation to solar radiation is of diminishing importance to a free-living mammal. Therefore, subcutaneous temperatures provide physiologically relevant information on the importance of solar radiation to mammals.",
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Biologging subcutaneous temperatures to detect orientation to solar radiation remotely in savanna antelope. / Botha, Arista; Lease, Hilary M.; Fuller, Andrea; Mitchell, Duncan; Hetem, Robyn S.

In: Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, Vol. 331, No. 5, 01.06.2019, p. 267-279.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Biologging subcutaneous temperatures to detect orientation to solar radiation remotely in savanna antelope

AU - Botha, Arista

AU - Lease, Hilary M.

AU - Fuller, Andrea

AU - Mitchell, Duncan

AU - Hetem, Robyn S.

PY - 2019/6/1

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JF - Journal of Experimental Zoology Part A: Ecological and Integrative Physiology

SN - 2471-5638

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