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For A. spinosus , significant correlations were found between population parameters and the ecological parameters of alkalinity and temperature. For the birth rate, 43.33% of variance is explained by alkalinity and 56.33% by alkalinity and temperature. Alkalinity, and alkalinity and temperature...
From bibliographic data the biomass correlations (organic dry weight) are constructed for the subsurface layer of a hypothetical 30 m deep silty sand station: 200 μg/ml macrofauna (including 120 μg/ml subsurface deposit feeders), 50 μg/ml meiofauna, 20 μg/ml Foraminifera, 1 μg/ml Ciliata and...
It is proposed that for many if not most animals — both herbivore and carnivore, vertebrate and invertebrate — the single most important factor limiting their abundance is a relative shortage of nitrogenous food for the very young. Any component of the environment of a plant, by varying the...
The two mesopsammal polychaetes, Hesionides arenaria and Trilobodrilus axi , show a relatively high resistance to cold temperatures in experiments. Great differences, however, between supercooled and frozen individuals exist. In chilling experiments T. axi is much less sensitive (no damage after...
The effect of seed predation by Microtus californicus and Mus musculus on plant numbers of four species of California annual grasses was investigated for one year period on a grassland near Davis, California. In winter, mice utilized dead star thistle plants for cover when grasses in open areas...
Laboratory feeding experiments were conducted with Dipodomys ordii and Perognathus flavus in an attempt to discover a mechanism which might result in seed size selection. There was no marked difference in the proportions of four seed types collected whether the rodents foraged in the presence or...
An energy budget, based entirely on field data, has been constructed for a community of three New Zealand alpine grasshopper species, Paprides nitidus Hutton, Sigaus australis (Hutton) and Brachaspis nivalis (Hutton) (Acrididae). The consumption results are compared with a previous gravimetric...
Measurements of acid metabolism and gas exchange were carried out four times during a year to assess the relative importance of temperature and the accompanying seasonal change to the carbon metabolism of Opuntia basilaris Engelm. & Bigel. plants growing in situ under irrigated and natural...
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