Now showing items 71-80 of 134
Changes in Sr/Ca, Ba/Ca and 87Sr/86Sr ratios between trophic levels in two forest ecosystems in the northeastern U.S.A.
(Kluwer Academic Publishers; Springer Science+Business Media, 2000-04)
The variability and biologicalfractionation of Sr/Ca, Ba/Ca and 87 Sr/ 86 Srratios were studied in a soil–plant–invertebrate–bird food chain in two forested ecosystems withcontrasting calcium availability in the ...
How to determine the compatibility of undirected character state trees
(Elsevier, 1979-10)
Methods for cladistic character compatibility analysis have required a priori estimates of the direction of evolutionary trends among the states of a character, in order to ensure consistency. Results are presented here ...
Avoidance responses of fathead minnow to strikes by four teleost predators
(Springer-Verlag, 1982-09)
1. Predator avoidance behavior of fathead minnow ( Pimephales promelas ) attacked by four teleosts (tiger musky, Esox sp; rainbow trout, Salmo gairdneri ; smallmouth bass, Micropterus dolomieu ; rock bass, Ambloplites ...
Roles of metabolic level and temperature regulation in the adjustment of Western plumed pigeons (Lophophaps ferruginea) to desert conditions
(Elsevier, 1973-02-01)
1. 1. Standard metabolic rate of western plumed pigeons (Lophophaps ferruginea) averages 0[middle dot]88 ml O2 (g hr)-1 during summer. This rate and the rate of evaporative water loss by these birds at 25[deg]C are well ...
Thermal dependence of water and electrolyte excretion in two species of lizards
(Elsevier, 1967-10)
1. 1. Lizards with different preferred temperatures were water-loaded, and their ability to excrete excess water and conserve electrolytes was tested at several temperatures.2. 2. Rates of water excretion were much less ...
The role of calcium in growth induced by indole-3-acetic acid and gravity in the leaf-sheath pulvinus of oat ( Avena sativa )
(Springer-Verlag; Springer-Verlag New York Inc., 1992-03)
Leaf-sheath pulvini of excised segments from oat ( Avena sativa L.) were induced to grow by treatment with 10 μM indole-3-acetic acid (IAA), gravistimulation, or both, and the effects of calcium, EGTA, and calcium channel ...
Inefficient purifying selection: the mammalian Y chromosome in the rodent genus Mus
(Springer-Verlag; Springer Science+Business Media, Inc., 2006-01)
Two related genes with potentially similar functions, one on the Y chromosome and one on the X chromosome, were examined to determine if they evolved differently because of their chromosomal positions. Six hundred fifty-seven ...
Supernumerary chromosome variation and heterochromatin distribution in the endemic New Zealand frog Leiopelma hochstetteri
(Springer-Verlag, 1987-09)
Specimens of the endemic New Zealand frog Leiopelma hochstetteri from Tapu on North Island were found to have six, nine or ten supernumerary chromosomes in their karyotypes. In comparison with previously published data, ...
Relative nutritional quality of C 3 and C 4 grasses for a graminivorous lepidopteran, Paratrytone melane (Hesperiidae)
(Springer-Verlag, 1992-10)
We tested the hypothesis that C 4 grasses are inferior to C 3 grasses as host plants for herbivorous insects by measuring the relative performance of larvae of a graminivorous lepidopteran, Paratrytone melane (Hesperiidae), ...
Pulmonary responses of asthmatic and normal subjects to different temperature and humidity conditions in an environmental chamber
(Springer-Verlag, 1992-01)
Determining the possible adverse health effects of air pollutants can be complicated by differences in the environmental conditions of temperature and humidity. To evaluate the potentially confounding effects of differences ...