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In this study, Prozercon celali sp. nov., collected from Honaz Mountain National Park in Turkey is described and illustrated on the basis of the adults females. Diagnostic characters of Prozercon celali: Postero-lateral tips of peritrematal shields reaching bases of marginal setae R₃ or R₄. Margin of opisthonotum with eight pairs of setae. Setae j1, r1, r4, r6, r7 markedly elongated, densely plumose, brush-like and apically rounded, setae j2, r2, r3 and r5 pilose or plumose, other podonotal setae short, smooth and neddle-like. Setae J₁–J₅, Z₁–Z₄ and S₁ plumose and apically tapering, seate J₆, S₂ and S₄ densely plumose, brush-like and apically rounded. Setae S₃ absent. Setae R₁–R₈ and Z₅ short and smooth. Dorsal cavities are distinct, sclerotized, equal in size and form. Additionally, a key to the adults of genus Prozercon known from Turkey is given.
Neomicrozercon nearcticus gen. et sp. nov., a new genus and species of zerconid mites (Acari: Mesostigmata: Zerconidae) are described based on material of both sexes collected in the United States of America (Oregon).
Natural forest fires are considered as a part of natural ecosystem processes. Short-term effects of prescribed fire on densities and taxonomic diversity of soil Acari were studied in fresh pine mixed forest (“Biala” forest ) in the Mazovia region, Central-Eastern Poland. Three plots (size 1 m²) of similar soil type and vegetation were selected for prescribed burning. Soil samples of an area of 10 cm² and the depth of 5 cm were collected in June 2005 – one day after the burning, 60 days after the burning and 90 days after the burning. Samples were collected from within the border of the burned plots, from the border itself, as well as from the surroundings. Due to the burning, the density of Acari communities decreased from 11.5 × 10³ ind. m⁻² recorded in the surroundings to 3.2 × 10³ ind. m⁻² recorded in the burned plots. Values recorded within the burned plots after the fire differed significantly from those recorded on the border (P = 0.05) and in the surroundings (P = 0.0001). After 60 days, an increase in Acari abundance was observed in the burned plots (P = 0.02), becoming similar to that noted for the border of the plot and for the surroundings. After 90 days, there were no significant differences between the burned parts of the plots, their borders and the surroundings; however, generally decreased densities were observed, possibly due to the seasonal reason. The observed changes suggest the restoration of Acari community after disturbance.
The oribatid mite genus Austrophthiracarus Balogh et Mahunka (Phthiracaridae) is recorded for the first time from China. Two new species of Austrophthiracarus are described: A. filiformis sp. nov. and A. longisetosus sp. nov. Their morphological descriptions and illustrations are given.
The ptyctimous soil mites from Australasian Region were studied. Seven new species of four genera were found, all of them originate from Australian Subregion; Oribotritiidae: Oribotritia parachichijimerisis sp. nov., O. paracorporaali sp. nov., Acrotritia paradivida sp. nov. and Steganacaridae: Austrophthiracarus paralargus sp. nov., A. foaensis sp. nov., Notophthiracarus paraunicarinatus sp. nov. and N. thorntonensis sp. nov. The descriptions of these new species are given. Sixty six new localities were studied and in all fifty ptyctimous species were found. Thirty eight species were found in new localities (26) in Australian Subregion and 21 species in new localities (40) on the Pacific Islands. Only nine species were found in both subregions. Fifteen species were noted to extend their geographical ranges within the Australasian Region. The list of species with new localities and the geographical ranges of six species have been extended.
Secondary succession of mesostigmatid soil mites was studied in two types of reclaimed electric power plant waste dumps in Łaziska Górne (Upper Silesia, Poland) in 1997–1998. The dumps on which the studies were carried out differed in their construction and structure. We sampled 6 sites from 2 localities (Sites I–III and IV–VI), representing 3 stages of ecological succession. The sites differed floristically and in substrate physiochemistry i.e. organic carbon content (Corg) and total nitrogen (Nt). Site I representing pioneer stage was characterized by a poorly developed herb layer, a lack of trees and shrubs, and low Corg, Nt and humus content. Sites III, V and VI represented a pre-forest stage and were characterized by a larger number of plant species, higher percent cover of trees and shrubs, and high Corg, Nt and humus content. Sites II and IV represented an intermediate stages of succession. In 18 months, we took 540 samples of soil and litter, and we collected 4811 mites, assigned to 86 species of mesostigmatid mites. The mite communities differed between successional stages, mostly with respect to the relative dominance among species. At the pioneer stage of succession, the mite community was characterized by a “degraded” model of species abundance distribution, with a high dominance of Asca bicornis. At more advanced ecological stages (Sites III, V and VI), mite communities had similarities with communities of forest. Some of the most abundant species in Sites III, V and VI were typical forest inhabitants. Sites I–III represent a real succession of plant communities, soil development and mite communities, showing an increase in species richness of mites, diversity indices and of the number of dominant species (creative type of succession). The succession within Sites IV–VI reveals a different course (rise-and-fall).
The aim of the study was to determine the influence of organic fertilization and mulching on the seedling vigour of European larch (Larix decidua Mill.) and occurrence of soil mites (Acari) in forest- and post-arable soils. Two different nursery experiments were carried out in the vegetation period of the year 2005 on light soils at two sylvan-natural regions of Poland. The first trial was conducted at Białe Błota near Bydgoszcz – on a brown podzolic soil. The second experiment – at Lipnik near Stargard Szczeciński – on an acid brown soil. The higher was the rainfall amount during the vegetation period, the lower was the seasonal irrigation rate supplied to European larch seedlings. Because of this the seasonal irrigation water rate applied at Białe Błota was higher than that at Lipnik. European larch seedlings grown on the forest soil were characterized by the increased height and the fresh mass than those cultivated on the post-arable ground. Seedlings grown in the forest soil on treatments mulched with litter were characterized by the increased height and the fresh mass of above-ground parts as compared to those cultivated on control plots (without mulching). Mulching with litter increased the number of mites, especially oribatid mites, as well as their species diversity. It can be recognized as the result of the positive influence of the mulching on the biological properties of the studied soils.
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