Abstract
Observations were conducted in the years 1999-2001 on the shrubs <i>Pinus mugo</i> Turra growing in the green areas of Lublin in two sites (street and park). The purpose of the studies was to establish the domination and frequency of aphids, their effect on the decorative character of shrubs and the occurrence of the aphidophagous arthropods in the aphid colonies inhabiting mountain pine. It was found out that <i>Schizolachnus pineti</i> F. was the dominating species in the street site (A), while <i>Cinara pini</i> L. dominated in the park site (B). The decorative character of shrubs was clearly lowered only by aphids <i>S. pineti</i>. Predatory arthropods occurred in aphid colonies inhabiting the shrubs <i>P. mugo</i>. Their population in both sites was low, that is why they probably had little influence on limiting the aphid population. Parasitic Hymenoptera of I and II degrees obtained from a culture of aphid mummies were more numerous in the street site.
Highlights
This paper is a continuation of studies on the fauna of aphids inhabiting the shrubs of mountain pine (Pinus mugo Turra) presented in Part I
In order to establish the qualitative and quantitative relations of particular aphid species occurring on the examined shrubs, two ecological indexes were used, namely domination and frequency (Górny and G r ü m, 1981; Szujecki, 1980; Trojan, 1977)
Schizolachnus pineti F. in site A occurred in all the studied years, while in site B the studies found out its presence only in the years 2000 and 2001
Summary
The area of studies and the methodology of observing the occurrence of aphids on the shrubs of Pinus mugo Turra in city conditions were discussed in detail in Part I. In order to establish the qualitative and quantitative relations of particular aphid species occurring on the examined shrubs, two ecological indexes were used, namely domination and frequency (constancy of occurrence) (Górny and G r ü m , 1981; Szujecki , 1980; Trojan , 1977). The index of domination (D) was calculated according to the following formula: QD D = Q x 100, where: na number of individuals belonging to a given species in all samples, n number of individuals of a studied systematic group in all samples. The index of frequency (F) shows the relation between the number of all samples where a given species occurred and the number of all samples taken from the studied plant. The constancy of occurrence (C), in other words the index of frequency (F) was calculated according to the following formula:
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