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The mechanisms of frequency tuning in gecko auditory hair cells.
Hear Res
January 2025
Department of Neuroscience, University of Wisconsin-Madison, WI 53706, USA.
We developed an isolated auditory papilla of the crested gecko to record from the hair cells and explore the origins of frequency tuning. Low-frequency cells displayed electrical tuning, dependent on Ca-activated K channels; high-frequency cells, overlain with sallets, showed a variation in hair bundle stiffness which when combined with sallet mass could provide a mechanical resonance of 1 to 6 kHz. Sinusoidal electrical currents injected extracellularly evoked hair bundle oscillations at twice the stimulation frequency, consistent with fast electromechanical responses from hair bundles of two opposing orientations, as occur in the sallets.
View Article and Find Full Text PDFFrictional adhesion of geckos predicts maximum running performance in nature.
J Exp Biol
January 2025
Department of Evolution, Ecology, and Organismal Biology, University of California, Riverside, CA 92521, USA.
Despite the myriad studies examining the diversity and mechanisms of gecko adhesion in the lab, we have a poor understanding of how this translates to locomotion in nature. It has long been assumed that greater adhesive strength should translate to superior performance in nature. Using 13 individuals of Bradfield's Namib day gecko (Rhoptropus bradfieldi) in Namibia, I tested the hypothesis that maximum running performance in nature (speed and acceleration) is driven by maximum frictional adhesive strength.
View Article and Find Full Text PDFNovel method to investigate thermal exchange rates in small, terrestrial ectotherms: A proof-of-concept on the gecko Tarentola mauritanica.
PLoS One
December 2024
CIBIO, Research Centre in Biodiversity and Genetic Resources, InBIO, Universidade do Porto, Vila do Conde, Portugal.
Thermoregulating ectotherms may resort to different external heat sources to modulate their body temperature through an array of behavioural and physiological adaptations which modulate heat exchange with the environment and its distribution across the animal's body. Even small-bodied animals are capable of fine control over such rates and the subsequent re-allocation of heat across the body. Such thermal exchanges with the environment usually happen through two non-mutually exclusive modes: heliothermy (radiant heat gain from the sun) or thigmothermy (heat gained or lost via conduction).
View Article and Find Full Text PDFGehyra Geckos Prioritize Warm Over Humid Environments.
J Exp Zool A Ecol Integr Physiol
December 2024
Research Institute for the Environment and Livelihoods, Charles Darwin University, Brinkin, Australia.
Maintaining stable hydric and thermal states are dual challenges for reptiles that inhabit terrestrial environments with variable conditions across time and space. Under some conditions, reptiles face a conundrum where both physiological parameters cannot be simultaneously maintained at preferred levels by behavioral or physiological means. Prioritization of behavioral regulation of hydric or thermal state, and at which point this prioritization changes, was tested for nine species of congeneric tropical geckos by assessing their use of microhabitats with distinct thermal and hydric conditions in a controlled environment.
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