S. K. Hetz

Publications30
h-index18
Citations1,079
Highly Influential Citations89
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Discontinuous Gas Exchange in Insects: A Clarification of Hypotheses and Approaches*
Many adult and diapausing pupal insects exchange respiratory gases discontinuously in a three‐phase discontinuous gas exchange cycle (DGC). We summarize the known biophysical characteristics of the… Expand
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Insects breathe discontinuously to avoid oxygen toxicity
The respiratory organs of terrestrial insects consist of tracheal tubes with external spiracular valves that control gas exchange. Despite their relatively high metabolic rate, many insects have… Expand
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Spiracle activity in moth pupae--the role of oxygen and carbon dioxide revisited.
After decades of intensive research, the actual mechanism behind discontinuous gas exchange in insects has not been fully understood. One open question concerns the actual way (closed, flutter, and… Expand
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Control of discontinuous gas exchange in Samia cynthia: effects of atmospheric oxygen, carbon dioxide and moisture
SUMMARY The evolution of discontinuous gas exchange (DGE) in insects is highly controversial. Adaptive hypotheses which have obtained experimental support include a water savings mechanism for living… Expand
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Physiological costs of growing fast: does accelerated growth reduce pay-off in adult fitness?
Accumulating evidence suggests that, in contrast to earlier assumptions, juvenile growth rates are optimised by means of natural and sexual selection rather than maximised to be as fast as possible.… Expand
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The role of the spiracles in gas exchange during development of Samia cynthia (Lepidoptera, Saturniidae).
  • S. K. Hetz
  • Biology, Medicine
  • Comparative biochemistry and physiology. Part A…
  • 1 December 2007
Spiracles and the tracheal system of insects allow effective delivery of respiratory gases. During development, holometabolous insects encounter large changes in the functional morphology of gas… Expand
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Physiological and behavioural consequences of capture and retention in carp sacks on common carp (Cyprinus carpio L.), with implications for catch-and-release recreational fishing.
a b s t r a c t Common carp (Cyprinus carpio L.) captured by specialised carp anglers are often retained in so-called "carp sacks" and released after substantial retention periods of several hours… Expand
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Oxygen uptake by convection and diffusion in diapausing moth pupae (Attacus atlas)
Abstract We investigated O2 uptake of diapausing Attacus atlas pupae during the “fluttering” period of a DGC using plethysmometry and flow through respirometry in combination with tracheal pressure… Expand
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Respiratory dynamics of discontinuous gas exchange in the tracheal system of the desert locust, Schistocerca gregaria
SUMMARY Gas exchange dynamics in insects is of fundamental importance to understanding evolved variation in breathing patterns, such as discontinuous gas exchange cycles (DGCs). Most insects do not… Expand
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Tradeoffs between metabolic rate and spiracular conductance in discontinuous gas exchange of Samia cynthia (Lepidoptera, Saturniidae).
The insect tracheal system is a unique respiratory system, designed for maximum oxygen delivery at high metabolic demands, e.g. during activity and at high ambient temperatures. Therefore, large… Expand
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