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The effect of water immersion on the non-parasitic stages of Boophilus microplus were investigated both under laboratory and field conditions. Survival of engorged female ticks was influenced by their age and the temperature of the water. Eggs and larvae were more resistant to submerison than...
Enchytraeus albidus was fed with Fucus , green algae, Zostera marina and Delesseria . Judging from absorption of food, rate of reproduction and duration of life, the animals preferred the plants in the sequence given above. As the putrefaction of a Fucus substrate advances, more and more...
Previous authors have used simple models to investigate the relative importance to population increase of variations in the total and age-specific reproductive rates. But while acknowledging that the latter were the product of the age specific birth and death rates, they have used their models...
Plethodon richmondi shenandoah occurs in at least three geographically isolated talus slopes in Shenandoah National Park, Virginia, U.S.A., each surrounded by a continuous population of Plethodon c. cinereus in the soil outside the talus. Distributions are contiguous but largely non-overlapping....
The primary productivity and the standing crop of the epipelic algal communities in two small ponds of contrasting nutrient status were measured over a 2 year period. Standing crops reflected the richer nutrient status of the eutrophic Abbot's Pond compared with the oligotrophic Priddy Pool as...
In the rotifer Brachionus calyciflorus there occurs a cyclomorphic variation concerning the absence or the presence of a pair of postero-lateral spines. If present, these spines may vary up to lorica length. The production of these spines is induced by starvation, low temperature, or a peptide...
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