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In the present paper we describe some experiments on the mite Macrocheles matrius aimed at investigating: a) the possible role of sperm exhaustion in the laying of unfertilized eggs in the last part of the female reproductive period; b) the relationship between age and female receptivity and inseminability. The results obtained show: 1) the number of fertilized eggs laid by a single female does not increase if she mates more than once during her life; 2) with increasing age the receptivity and...
In the mite Macrocheles matrius (Hull), like in most Macrochelida species, the males arise from unfertilized eggs, while the females develop from fertilized eggs (arrhenotoky). This kind of reproduction should lead to oscillatory variations in the population sex ratio. In fact, in the case of a population with a 1 : 1 sex ratio or an excess of males, most (or the whole) of the eggs should be fertilized, determining in the following generations a considerable prevalence of females. In this new situation...
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