Journal of Comparative Physiology B

, Volume 180, Issue 6, pp 857–868

Comparative physiology of Australian quolls (Dasyurus; Marsupialia)

Original Paper

DOI: 10.1007/s00360-010-0452-3

Cite this article as:
Cooper, C.E. & Withers, P.C. J Comp Physiol B (2010) 180: 857. doi:10.1007/s00360-010-0452-3

Abstract

Quolls (Dasyurus) are medium-sized carnivorous dasyurid marsupials. Tiger (3,840 g) and eastern quolls (780 g) are mesic zone species, northern quolls (516 g) are tropical zone, and chuditch (1,385 g) were once widespread through the Australian arid zone. We found that standard physiological variables of these quolls are consistent with allometric expectations for marsupials. Nevertheless, inter-specific patterns amongst the quolls are consistent with their different environments. The lower Tb of northern quolls (34°C) may provide scope for adaptive hyperthermia in the tropics, and they use torpor for energy/water conservation, whereas the larger mesic species (eastern and tiger quolls) do not appear to. Thermolability varied from little in eastern (0.035°C °C−1) and tiger quolls (0.051°C ºC−1) to substantial in northern quolls (0.100°C ºC−1) and chuditch (0.146°C ºC−1), reflecting body mass and environment. Basal metabolic rate was higher for eastern quolls (0.662 ± 0.033 ml O2 g−1 h−1), presumably reflecting their naturally cool environment. Respiratory ventilation closely matched metabolic demand, except at high ambient temperatures where quolls hyperventilated to facilitate evaporative heat loss; tiger and eastern quolls also salivated. A higher evaporative water loss for eastern quolls (1.43 ± 0.212 mg H2O g−1 h−1) presumably reflects their more mesic distribution. The point of relative water economy was low for tiger (−1.3°C), eastern (−12.5°C) and northern (+3.3) quolls, and highest for the chuditch (+22.6°C). We suggest that these differences in water economy reflect lower expired air temperatures and hence lower respiratory evaporative water loss for the arid-zone chuditch relative to tropical and mesic quolls.

Keywords

AllometryBody temperatureEvaporative water lossMetabolic rateRelative water economyThermal conductanceVentilation

Abbreviations

BMR

Basal metabolic rate

Cdry

Dry (non-evaporative) thermal conductance

Cwet

Wet (evaporative and non-evaporative) thermal conductance

EHL

Evaporative heat loss

EO2

Oxygen extraction

EQ

Evaporative quotient

EWL

Evaporative water loss

fR

Respiratory frequency

MHP

Metabolic heat production

MWP

Metabolic water production

MR

Metabolic rate

PRWE

Point of relative water economy

RER

Respiratory exchange ratio

RH

Relative humidity

RWE

Relative water economy

SNK

Student–Newman–Keuls post hoc multiple comparison test

Ta

Ambient temperature

Tb

Body temperature

VCO2

Carbon dioxide production rate

VI

Minute volume

VO2

Oxygen consumption rate

VT

Tidal volume

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Department of Environmental and Aquatic SciencesCurtin University of TechnologyPerthAustralia
  2. 2.Animal Biology M092University of Western AustraliaCrawleyAustralia