The aim of the present research was to compare the communities of oribatid
mites (Oribatida) on the plantations of chokeberry (Aronia melanocarpa (Michx.)
Elliott) and blackcurrant (Ribes nigrum L.) as well as to define the effect of microirrigation
on those Acari. The experiment was performed in degraded
Phaeozems formed from sand, on shallow-deposited sand in Kruszyn Krajeński in
the vicinity of Bydgoszcz. The soil reaction was slightly acid or acid and the differences
in the acidity between chokeberry and blackcurrant were inconsiderable.
The abundance of oribatid mites on chokeberry and blackcurrant plantations
ranged from 3110 to 5290 individuals · m-2 and it was much higher, as compared
with the neighbouring set-aside. The density of Oribatida on blackcurrant plantation
was clearly higher than in chokeberry; however there was recorded no significant
effect of the type of irrigation on the density. In total on both plantations there
were reported 31 species of oribatid mites; mean species number s in blackcurrant
was higher than in chokeberry. The dominance structure of oribatid mites on the
chokeberry plantation was more even than in blackcurrant and in Tectocepheus
velatus communities dominated mostly. The species preferred the blackcurrant
plantation and irrigation stimulated its abundance. Chamobates schutzii, an oribatid
mite, came second; it preferred the soil of chokeberry plantation; it was especially
numerous on irrigated stands. Scutovertex sculptus also demonstrated
some preference for chokeberry soil and no tolerance to irrigation. Whereas such
oribatid mite species as Gymnodamaeus bicostatus, Metabelba pulverulenta,
Oppiella nova, Quadroppia quadricarinata and Damaeus sp. showed some preference
for the blackcurrant plantation.
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