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Few studies have addressed how density-dependent and density-independent regulation of population growth and abundance varies among habitats for a spe...
Read moreSexual reproduction in 9 clones of Eichhornia crassipes from different parts of the world was examined in the glasshouse. Eight of the clones flowered...
Read moreTwo cultivars of barley, one resistant and one susceptible to aphids, were grown in pots in mono- or mixed culture in the laboratory, and either infes...
Read moreHawthorn scrub in an upland area (>150 m alt.) of North Wales was surveyed, and at three typical study sites, hawthorn occurrence was studied in re...
Read moreA simple model is used to calculate transpiration and assimilation rates for leaves or canopies. This is then used to investigate interactions between...
Read moreSeed collected from natural stands of P. menziesii growing at (a) 250, (b) 520 and (c) 880 m alt. in Oregon, and from a cross between trees in (a) and...
Read moreA germination response study using mannitol was conducted in growth chambers. The highest rate of germination in Agropyron smithii (western wheatgrass...
Read moreNovel insecticides are continuously being developed for application in response to increased legal restriction of previously developed insecticides an...
Read moreAfter an accidental spillage, the total plant cover, total number of species, mean number of species per quadrat and the Shannon-Wiener function progr...
Read moreSix Swedish beech forest sites, representing the range of pH for soils which support Galium odoratum and Stellaria nemorum, were sampled during 1 year...
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