Header

UZH-Logo

Maintenance Infos

Metabolic rates of three gazelle species (Nanger soemmerringii, Gazella gazella, Gazella spekei) adapted to arid habitats


Dittmann, Marie T; Hebel, Christiana; Arif, Abdi; Kreuzer, Michael; Clauss, Marcus (2015). Metabolic rates of three gazelle species (Nanger soemmerringii, Gazella gazella, Gazella spekei) adapted to arid habitats. Mammalian Biology - Zeitschrift für Säugetierkunde, 80(5):390-394.

Abstract

The basal metabolic rate of mammals correlates with body mass, but deviations from this regression have been observed and explanations comprise ecological adaptations, reproductive strategies or phylogeny. Certain mammalian groups, adapted to arid environments, show comparatively lower metabolic rates. To expand existing datasets and to investigate metabolic rates in ruminants adapted to arid environments, we conducted respiration measurements with three gazelle species (Gazella spekei, G. gazella and N. soemmerringii, total n = 16). After an adaptation period to a diet of fresh lucerne offered ad libitum, subjects were put separately into respiration boxes for 24 h where they had free access to food and water. Oxygen consumption and carbon dioxide production were measured with a modular system of gas analyzers and pumps. Mean and resting metabolic rate (RMR) were calculated by accounting for the entire measurement phase or the lowest 20 oxygen measurements, respectively. N. soemmerringii had the lowest relative RMR values and the highest respiratory coefficients compared to the other species. Measured values were compared to expected RMR values calculated based on body mass. Gazella spekei and G. gazella showed higher RMR values than expected, while the RMR of N. soemmerringii was in the range of expected values. Our results indicate that not all mammals adapted to aridity have lower metabolic rates under conditions of unlimited resources and that in these cases other physiological adaptations might be of higher importance. Further extensions of the datasets could allow explaining which deviations of metabolic rate from the body mass regressions result from convergent adaptations.

Abstract

The basal metabolic rate of mammals correlates with body mass, but deviations from this regression have been observed and explanations comprise ecological adaptations, reproductive strategies or phylogeny. Certain mammalian groups, adapted to arid environments, show comparatively lower metabolic rates. To expand existing datasets and to investigate metabolic rates in ruminants adapted to arid environments, we conducted respiration measurements with three gazelle species (Gazella spekei, G. gazella and N. soemmerringii, total n = 16). After an adaptation period to a diet of fresh lucerne offered ad libitum, subjects were put separately into respiration boxes for 24 h where they had free access to food and water. Oxygen consumption and carbon dioxide production were measured with a modular system of gas analyzers and pumps. Mean and resting metabolic rate (RMR) were calculated by accounting for the entire measurement phase or the lowest 20 oxygen measurements, respectively. N. soemmerringii had the lowest relative RMR values and the highest respiratory coefficients compared to the other species. Measured values were compared to expected RMR values calculated based on body mass. Gazella spekei and G. gazella showed higher RMR values than expected, while the RMR of N. soemmerringii was in the range of expected values. Our results indicate that not all mammals adapted to aridity have lower metabolic rates under conditions of unlimited resources and that in these cases other physiological adaptations might be of higher importance. Further extensions of the datasets could allow explaining which deviations of metabolic rate from the body mass regressions result from convergent adaptations.

Statistics

Altmetrics

Downloads

18 downloads since deposited on 16 Jul 2015
13 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:05 Vetsuisse Faculty > Veterinary Clinic > Department of Small Animals
Dewey Decimal Classification:570 Life sciences; biology
630 Agriculture
Uncontrolled Keywords:chamber respirometry; metabolism; aridity; bovid; ruminant
Language:English
Date:2015
Deposited On:16 Jul 2015 12:28
Last Modified:27 Sep 2016 07:12
Publisher:Elsevier
ISSN:1616-5047
Funders:SNF
Publisher DOI:https://doi.org/10.1016/j.mambio.2015.05.008

Download

Preview Icon on Download
Content: Published Version
Filetype: PDF - Registered users only
Size: 641kB
View at publisher
Preview Icon on Download
Preview
Content: Accepted Version
Filetype: PDF
Size: 418kB