Abstract
One of the most immediate responses to disturbance is a change in population density. Change in plant population density may have an effect on visiting and pollinating insects which may influence both fecundity and gene flow. The management regime of the grasslands has a major influence on the density and distribution of plant species. Changes in the management in the river valley grasslands of the Drentse Aa from intensive grassland production to mowing once a year without the applications of fertilizers has caused large changes in the density and distribution of Rhinanthus angustifolius. Initially the density rose than fall becoming very abundant locally (de Hullu et al., 1985). This study considers the effect of population density on visitation pollination and gene exchange.
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