Julia Nowack
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View article: The upper limit of thermoneutrality is not indicative of thermotolerance in bats
The upper limit of thermoneutrality is not indicative of thermotolerance in bats Open
To assess the vulnerability of birds and mammals to climate change recent studies have used the upper critical limit of thermoneutrality (TUC) as an indicator of thermal tolerance. But, the association between TUC and thermal tolerance is …
View article: Non-Torpid Heterothermy in Mammals: Another Category along the Homeothermy–Hibernation Continuum
Non-Torpid Heterothermy in Mammals: Another Category along the Homeothermy–Hibernation Continuum Open
Synopsis Variability in body temperature is now recognized to be widespread among whole-body endotherms with homeothermy being the exception rather than the norm. A wide range of body temperature patterns exists in extant endotherms, spann…
View article: Looking Ahead: Predicting the Possible Ecological and Physiological Response of Galago Moholi to Environmental Change
Looking Ahead: Predicting the Possible Ecological and Physiological Response of Galago Moholi to Environmental Change Open
Large scale changes to the natural environment, due to both climate change and direct human activities (e.g., urbanization), pose a great risk to biodiversity. As this realization has set in, the number of studies modelling and monitoring …
View article: Rare and Opportunistic Use of Torpor in Mammals—An Echo from the Past?
Rare and Opportunistic Use of Torpor in Mammals—An Echo from the Past? Open
Synopsis Torpor was traditionally seen as a winter survival mechanism employed by animals living in cold and highly seasonal habitats. Although we now know that torpor is also used by tropical and subtropical species, and in response to a …
View article: Saving energy via short and shallow torpor bouts
Saving energy via short and shallow torpor bouts Open
Maintaining a high and stable body temperature as observed in most endothermic mammals and birds is energetically costly and many heterothermic species reduce their metabolic demands during energetic bottlenecks through the use of torpor. …
View article: Datasets for "Saving energy via short and shallow torpor bouts"
Datasets for "Saving energy via short and shallow torpor bouts" Open
Dataset associated to Nowack J, N Mzilikazi and KH Dausmann (2023). Saving energy via short and shallow torpor bouts. Journal of Thermal Biology. Datset 1: Ibutton data from three male Galago moholi over the austral winter (data recorded …
View article: <strong>Dataset for Rare and opportunistic use of torpor in mammals – an echo from the past?</strong>
<strong>Dataset for Rare and opportunistic use of torpor in mammals – an echo from the past?</strong> Open
Excel list of species known to use torpor that were used in the analysis. The file includes information about the climatic region, the mode of torpor use, flexibility in torpor bout duration, seasonality of torpor use and torpor predictabi…
View article: Limited Physiological Compensation in Response to an Acute Microclimate Change in a Malagasy Bat
Limited Physiological Compensation in Response to an Acute Microclimate Change in a Malagasy Bat Open
Rapid environmental changes are challenging for endothermic species because they have direct and immediate impacts on their physiology by affecting microclimate and fundamental resource availability. Physiological flexibility can compensat…
View article: Whole‐body endothermy: ancient, homologous and widespread among the ancestors of mammals, birds and crocodylians
Whole‐body endothermy: ancient, homologous and widespread among the ancestors of mammals, birds and crocodylians Open
The whole‐body (tachymetabolic) endothermy seen in modern birds and mammals is long held to have evolved independently in each group, a reasonable assumption when it was believed that its earliest appearances in birds and mammals arose man…
View article: The tarnished silver spoon? Trade‐off between prenatal growth and telomere length in wild boar
The tarnished silver spoon? Trade‐off between prenatal growth and telomere length in wild boar Open
Life‐history theory predicts a trade‐off between growth rates and lifespan, which is reflected by telomere length, a biomarker of somatic state. We investigated the correlation between telomere length and early‐life growth of wild boar pig…
View article: Body Temperature Frequency Distributions: A Tool for Assessing Thermal Performance in Endotherms?
Body Temperature Frequency Distributions: A Tool for Assessing Thermal Performance in Endotherms? Open
There is increasing recognition that rather than being fully homeothermic, most endotherms display some degree of flexibility in body temperature. However, the degree to which this occurs varies widely from the relatively strict homeotherm…
View article: Cardiovascular effects of intravenous vatinoxan in wild boars ( <i>Sus scrofa</i> ) anaesthetised with intramuscular medetomidine‐tiletamine‐zolazepam
Cardiovascular effects of intravenous vatinoxan in wild boars ( <i>Sus scrofa</i> ) anaesthetised with intramuscular medetomidine‐tiletamine‐zolazepam Open
Background The potent sedative medetomidine is a commonly used adjunct for the immobilisation of non‐domestic mammals. However, its use is associated with pronounced cardiovascular side effects, such as bradycardia, vasoconstriction and de…
View article: Editorial: Coping With Environmental Fluctuations: Ecological and Evolutionary Perspectives
Editorial: Coping With Environmental Fluctuations: Ecological and Evolutionary Perspectives Open
Editorial of the Research Topic
\nCoping With Environmental Fluctuations: Ecological and Evolutionary Perspectives
View article: Ambient Temperature Cycles Affect Daily Torpor and Hibernation Patterns in Malagasy Tenrecs
Ambient Temperature Cycles Affect Daily Torpor and Hibernation Patterns in Malagasy Tenrecs Open
Hibernation and daily torpor (heterothermy) allow endotherms to cope with demanding environmental conditions. The depth and duration of torpor bouts vary considerably between tropical and temperate climates, and tropical hibernators manage…
View article: Variable Climates Lead to Varying Phenotypes: “Weird” Mammalian Torpor and Lessons From Non-Holarctic Species
Variable Climates Lead to Varying Phenotypes: “Weird” Mammalian Torpor and Lessons From Non-Holarctic Species Open
Mammalian heterotherms, species that employ short or long periods of torpor, are found in many different climatic regions. Although the underlying physiological mechanisms of heterothermy in species from lower latitudes (i.e. the tropics a…
View article: An oversimplification of physiological principles leads to flawed macroecological analyses
An oversimplification of physiological principles leads to flawed macroecological analyses Open
Macrophysiological analyses are useful to predict current and future range limits and improve our understanding of endotherm macroecology, but such analyses too often rely on oversimplifications of endothermic thermoregulatory and energeti…
View article: Birds don't mind the light – if it's dim enough
Birds don't mind the light – if it's dim enough Open
Have you have ever been on an airplane at night and looked down on the illuminated earth? Our various light sources can be seen from miles away and the brightening of the night sky above cities even has a name – urban sky glow. Obviously, …
View article: Always a price to pay: hibernation at low temperatures comes with a trade-off between energy savings and telomere damage
Always a price to pay: hibernation at low temperatures comes with a trade-off between energy savings and telomere damage Open
We experimentally tested the costs of deep torpor at low temperatures by comparing telomere dynamics in two species of rodents hibernating at either 3 or 14°C. Our data show that hibernators kept at the warmer temperature had higher arousa…
View article: Rapid establishment of teat order and allonursing in wild boar <i>(Sus scrofa)</i>
Rapid establishment of teat order and allonursing in wild boar <i>(Sus scrofa)</i> Open
Transfer of milk is the fundamental common characteristic of mammalian reproduction, but species differ considerably with respect to nursing strategies. The consequences of teat orders and allonursing have been studied intensively in domes…
View article: Non-invasive evaluation of stress hormone responses in a captive population of sugar gliders (Petaurus breviceps)
Non-invasive evaluation of stress hormone responses in a captive population of sugar gliders (Petaurus breviceps) Open
Faecal hormone monitoring offers a robust tool to non-invasively determine the physiological stress experienced by an individual when faced with natural or human-driven stressors. Although already quantified for several species, the method…
View article: Muscle nonshivering thermogenesis in a feral mammal
Muscle nonshivering thermogenesis in a feral mammal Open
Muscle nonshivering thermogenesis (NST) was recently suggested to play an important role in thermoregulation of species lacking brown adipose tissue (BAT). The mechanism, which is independent of muscle contractions, produces heat based on …
View article: A spider's decision depends on its thirst
A spider's decision depends on its thirst Open
Have you ever thought about how your preference for food changes with the weather? In winter, we often fancy something warm and highly calorific, like roasts or cheese-loaded pasta, while we might prefer something fresh and crunchy, like a…
View article: ‘Pacifishts’ have nothing to fight for
‘Pacifishts’ have nothing to fight for Open
Two years ago, pictures of bleached corals at the Great Barrier Reef in Australia shocked the world. A 9 month marine heat wave had caused global coral bleaching, leading to devastation of coral reefs across the planet. Bleaching occurs wh…
View article: Muscle nonshivering thermogenesis in a feral mammal
Muscle nonshivering thermogenesis in a feral mammal Open
While small mammals and neonates are able to maintain an optimal body temperature (T b ) independent of ambient conditions by producing heat via nonshivering thermogenesis (NST) in the brown adipose tissue (BAT), larger mammals and other m…