Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 63

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 4 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  oribatid mite
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 4 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
The biodiversity is a core value in all ecosystems. The nitrogen (N) addition in the form of N fertilizers has effect to a wide variety of fauna living in soils. N losses from arable land should tend not only to cause water eutrophication, but also lower soil nutrient stocks and decreasing soil fertility. This study determined the effect of N soil content in conventional tillage agro-ecosystem on the soil fauna diversity in grass stripes under the sloped arable land. My objective here is to observe soil faunal taxa living in grass filter strips. The goal of this work is to describe the relationship of soil fauna to the nitrate (NO₃⁻) content runoff from fields and captured in grass filter strips. The field work was carried out during period from May until June 2013, for soil fauna investigation the extraction in Berlese — Tullgren funnels were used. Nitratenitrogen (NO₃⁻N) was extracted from air-dried sieved soil using a 2 M KCl solution. Altogether 2,020 specimens representing 19 arthropod groups were found in twenty study sites. Most abundant taxa found practically in each of sampling site were Collembola, Acari and the suborder of Oribatid mites. Statistical evaluations revealed that the effect of NO₃⁻ concentration in the soil on the average value of the total edaphic individual numbers was statistically significant; the same applies for the abundance of Acari mites. No significant results were find for the Oribatid mites and the Collembola family; however, there was a clear trend of increasing abundance with increasing concentrations of NO₃⁻.
Detailed morphological descriptions of juvenile stages of two oribatid species from the family Damaeidae: Epidamaeus kamaensis (Sellnick, 1925) and Porobelba spinosa (Sellnick, 1920) are presented. Juvenile stages of E. kamaensis and earlier known immatures of Epidarnaeus (E. puritanicus, E. longisetus) differ by minor differences in setal structure and measurements. Juvenile stages of Epidarnaeus and Damaeus differ by the following characters: shape of exuvial attachment cornicle in nymphs, correlation of the length and structure of gastronotal setae, the larval body posterior, form of sensilli, and leg setation. Juvenile stages of these two genera are identical in genital, aggenital, anal, adanal, gastronotal and epimeral setation, structure of famulus, and structure of cerotegument. Moreover, in the present paper new data about immatures of Porobelba spinosa. It is the first record of all juvenile stages of Porobelba, that is why a comparison of ontogeny development of this genus and other damaeid mites is premature.
Descriptions of two new species of phthiracaroid ptyctimous mites Plonaphacarus trojani sp. nov. and Notophthiracarus trojani n. sp. from Australia are dedicated to an oustanding Polish ecologist and entomologist Professor Przemysław Trojan at his 80th birthday.
We described Machadobelba shtanchaevae sp. nov. and Microtegeus khaustovi sp. nov., collected in Bale Mountains National Park (Africa, Ethiopia). The first new species is similar to Machadobelba symmetrica Balogh, 1958 (Distribution: Africa, Congo) and to Machadobelba ceylonica Balogh, 1970 (Asia, Sri Lanka), but differs from the former species by body size, length of costulae and length of notogastral setae, and from the latter species by body size, morphology of cristae and position of adanal setae ad3. Microtegeus khaustovi sp. nov. is similar to Microtegeus variabilis Mahunka, 1988 (Africa, Tanzania) and Microtegeus rugosus Mahunka, 1982 (Africa, Ethiopia), but differs from the former species by body size, number of prodorsal tubercles, length of notogastral setae c, and morphology of the notogaster; from the latter species it differs by morphology of lamellar setae, the number of prodorsal tubercles, and morphology of the notogaster.
The morphology of juvenile instars of the oribatid mites Neoliodes terrestris and N. ionicus (Neoliodidae) is described and illustrated. The juveniles of these two species are compared to those of other Neoliodes species. New diagnoses of the juvenile instars of Neoliodidae and Neoliodes are given. Identification keys to larvae and nymphs of Neoliodidae genera are presented.
The morphology of juvenile stages of the oribatid mites Pedrocortesella africana Pletzen, 1963 and Aleurodamaeus africanus Mahunka, 1984 is described and illustrated. The juveniles of Pedrocortesella africana are characterized by: cuticle with reticular ornamentation and folds; body with microgranular cerotegument; prodorsal setae leaf-shaped, sensilli petiolate, tuberculate blades with a rounded distal margin; gastronotic region flat; larva and nymphs with nine pairs of leaf-shaped gastronotic setae; scalps folded, larval scalp with seven pairs of setae, nymphal scalps with six pairs of setae; leg famulus sunken. The juveniles of Aleurodamaeus africanus are characterized by: cuticle smooth; body with filamentous cerotegument and with very not numerous granules; prodorsal setae setiform (except short interlamellar setae in nymphs); gastronotic region convex in lateral aspect; larva and nymphs with 12 of setiform gastronotic setae; scalps with reticular ornamentation, larval scalp with nine pairs of setae, nymphal scalps with ten pairs of setae; leg famulus emergent. The comparative analysis between known juveniles in Plateremaeoidea and Gymnodamaeoidea are given.
Two new species of the superfamily Oripodoidea, Maculobates bruneiensis sp. nov. and Perscheloribates interlamellaris sp. nov., are described from Brunei. The first new species differs from other species of Maculobates by the presence of an anterior notogastral margin and a specific furrow on ventral side. The second new species differs from other species of Perscheloribates by the microfoveolate body surface. The genera Maculobates and Perscheloribates are for the first time recorded in Brunei; Maculobates is for the first time recorded in the Oriental region.
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.
Cuticular hydrocarbon profiles of representatives of different groups of oribatid mites (Mixonomata: Steganacarus carinatus, Collohmannia gigantea; Desmonomata: Hermannia gibba; Brachypylida: Zetorchestes falzonii) were investigated by gas chromatography — mass spectrometry. In general, cuticular extracts showed a series of straight chain alkanes being arranged in two (or three, respectively) distinctly different patterns: 1) a pattern with a gaussian quantitative distribution of alkanes from C23 to C36 was noticed in extracts of C. gigantea and H. gibba, with C29 – C32 being most abundant. 2) A pattern exhibiting a saw-tooth-like quantitative distribution of alkanes — with only odd-numberd alkanes being abundant — appeared to be characteristic for S. carinatus. 3) Extracts of Z. falzonii showed no hydrocarbons. The hydrocarbons are considered to origin in a lipid layer which is covering the cuticle: this layer is regarded to represent the inner — and in some cases the only — layer of the oribatid cerotegument. The differences in cuticular hydrocarbon profiles among oribatid species may represent a promising point of attachment for further chemosystematic studies.
Crotonia is a genus of middle-derivative oribatid mites that is widely distributed in, and almost restricted to, the Southern Hemisphere. Currently only five species are reported from the Neotropical region. Herein a new species from Chile - C. blaszaki sp. nov. - is described based on the adult instar. The characters possessed by this species combine those of the so-called “obtecta”, “caudalis” and “unguifer” species-groups, which suggests that the groupings of Crotonia species should be reevaluated.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 4 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.