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.g. Houx et al., 1971; Wnr.NtsLEy et al., 1978: for cat muscle). As a consequence for most muscles it is not known to what extent the physiological range of the length force relation may be utilised in viao. 506 Most studies on isometric activity of muscle are directed at muscular energy consumption of

In: Netherlands Journal of Zoology

that a predator maximizes its instanteneous rate of gain (energy per unit of time). In these models the encounter rate with different prey types is constant. However, when predators forage in patches, depletion will occur and therefore this assumption is relaxed in this paper. As a consequence, the

In: Netherlands Journal of Zoology

ANAEROBIC CARBOHYDRATE METABOLISM IN THE SEA MUSSEL MYTILUS EDULIS L. by A. DE ZWAAN, W. J. A. VAN MARREWIJK and D. A. HOLWERDA (Laboratory of Chemical Animal Physiology, State University, Utrecht, The Netherlands) Vertebrates supply their energy by aerobic degradation of carbohydra- tes

In: Netherlands Journal of Zoology

specific habitats of S. comma and S. pubescens, re- spectively. In S. comma, increased metabolic rates and locomotory activities demonstrate that foraging on open sites is costly in terms of total energy expenditure in these beetles. These costs can quantify the difference in reproductive effort with

In: Netherlands Journal of Zoology

Department of Field Crops and Grassland Science, Agricultural University, Haarweg 33, 6709 PH Wageningen, The Netherlands) SUMMARY Diet quality for a population of wild rabbits was determined by assessing the quality of the stomach contents. Two parameters were measured: digestibility (energy con- tent) and

In: Netherlands Journal of Zoology

involved in some aspect of energy metabolism control. KEY WORDS: somatolactin, growth hormone, plasma levels, starvation, metabolism, rainbow trout. A possible role for somatolactin (SL) in energy metabolism control has been suggested based on the observations that plasma SL levels increase during

In: Netherlands Journal of Zoology

assimilation are routine studies of thermal biology of lizards. Data generated are helpful in determining the role of lizards in the energy dynamics of ecosystems (BALLINGER & HOLSCHER, 1983). Previous studies generally showed that the influence of temperature on some traits (e.g., food intake and food passage

In: Netherlands Journal of Zoology

decreasing amplitude, which can be described by its frequency and degree of decay. This decay, which is caused by the internal friction or energy dissipated during the vibration, is a measure of the damping properties of the material of the specimen. In a linearly elastic material the stress is

In: Netherlands Journal of Zoology

duration under given conditions that are speci- fied for each type of experiment; - burst swimming is very fast swimming that can be maintained for a number of seconds. External activity is supported by energy metabolism that provides the power for swimming performance. At zero swimming activity the

In: Netherlands Journal of Zoology

cellular mechanisms through which senescence comes about. The disposable soma theory explains ageing through asking how best an organism should allocate its metabolic resources, primarily energy, between on the one hand keeping itself going from one day to the next (maintenance), and on the other hand

In: Netherlands Journal of Zoology