Physiological significance of the microclimate in night refuges of the numbat Myrmecobius Fasciatus
MetadataShow full item record
Numbats (Myrmecobius fasciatus) seek overnight refuge in hollow logs, tree hollows and burrows, which provide protection from predators. Occupied night refuges were on average 5ºC warmer than ambient temperature, which would result in considerable energy savings (35 kJ over 12 h). Use of a nest within the refuge reduced calculated energy expenditure by a further 55 kJ over 12 h. Mean nightly temperature didn’t differ with refuge type, but the nightly pattern of refuge temperature did. Burrows had higher insulation than logs or tree hollows, and had more constant night temperatures and higher minimum temperatures. Season had a significant influence on refuge temperature, with lower temperatures in winter than in other seasons for all refuge types. The gas composition of occupied night refuges was different to ambient, with refuge air differing in O2 content by a maximum of 2.3%, and CO2 by no more than 3.0% from ambient levels. The relative humidity in M. fasciatus refuges was extremely variable (23- 100%), but was generally lower than ambient relative humidity. The overnight refuges of M. fasciatus (hollow logs, tree hollows and burrows) significantly buffer thermal conditions without major effects on the gaseous or hygric environment.
Copyright © 2011 CSIRO
Showing items related by title, author, creator and subject.
Growth rates and survival of western rock lobster (Panulirus cygnus) at twotemperatures (ambient and 23 C) and two feeding frequenciesJohnston, D.; Melville-Smith, R.; Hendriks, B.; Phillips, Bruce (2008)Wild caught post-pueruli, year one and year two post settlement juvenile western rock lobster, Panuliruscygnus, were held at ambient temperatures (15.6 C to 23.1 C; mean 19.00.07 C) or at 23 C, and fed thesame ration of ...
Influence of season and weather on activity patterns of the numbat (Myrmecobius fasciatus) in captivityCooper, Christine; Withers, P. (2004)The influence of season and weather on activity was examined for captive numbats, to separate the influence of weather from predation pressure and food availability, since these confound the interpretation of activity ...
Higher water temperature leads to precocious maturation of western rock lobsters (Panulirus cygnus), but are things that simple?Melville-Smith, Roy; de Lestang, S.; Johnston, D.J. (2010)During a rock lobster post-puerulus grow out project, western rock lobsters from three different cohorts (post-puerulus, year-1 and year-2) were held for 12 months under two temperature regimes (ambient and 23oC) and two ...