Search Results

You are looking at 1 - 7 of 7 items for

  • Author: L. Háněl x
Clear All Modify Search
Open access

L. Háněl

Summary

The assemblages of soil nematodes were studied at five alpine meadow sites, 1763-2200 m. a. s. I., in the Tatra National Park in the Slovak Republic. A total of 110 species were distinguished, 19 species were recorded in the Slovak Republic for the first time. The interesting new records are the occurrence of Sphaeronema alni at the elevation of 2003 m a . s. I. and the populations of Coomansus menzeli at four sites. The total numbers of species at individual sites varied from 45 to 72. The most abundant nematode genera were Aglenchus, Plectus. Acrobeloides, Paratylenchus, Eudorylaimus, Helicotylechus, and Aphelenchoides. The total mean abundance ranged from 704 to 2054 × 103ind.m-2 and the total mean biomass from 442 to 1531 mg.m-2. The lowest values of the Maturity Indices (ΣMI, Ml) were found at the highest elevation. The significantly highest values of the Plant Parasite Index were at the lowest elevation. The mean values of the of the Enrichment Index varied from 16.3 to 38.4, the mean values of the Structure Index from 64.1 to 85.4. The Structure metabolic footprints were significantly greater at the lowest elevation than at the highest elevation. Cluster Analysis and Principal Component Analysis performed on species presence and absence, genera abundance and genera metabolic footprints showed nematode assemblages at sites of high­er elevations different from those at sites of lower elevations.

Open access

L. Háněl and A. Čerevková

Abstract

Soil nematodes were studied in 11 meadow sites in the White Carpathians. In total, 155 species and 86 genera were found but the composition of nematode assemblages in eastern and western side of the mountains differed. Most nematode species belonged to the orders Tylenchida (52), Dorylaimida (35) and Rhabditida (16), and to the trophic groups bacterivores (47), plant parasites (29) and omnivores (25). In individual sites and sampling dates the number of species varied in range 18–68, genera 18–52, H’spp 1.32–3.50, H’gen 1.31–3.21, T 1.79–5.70, MI 2.32–3.63, PPI 2.03–2.98, and ΣMI 2.20–3.50. Composition of nematode assemblages and their matrix classification indicated a low degree of anthropogenous disturbance to the meadows.

Open access

P. Zolda and L. Háněl

Abstract

Nematode communities of cultivated vineyards showed characteristics typical for cultivated ecosystems, e.g. predominance of plant parasitic nematodes followed by bacterivores. The abandoned vineyard showed a reverse trophic structure: bacterivorous nematodes with short life cycles (cp 2) predominated and the population of plant parasites was small. The nematode trophic structure of the dry meadow was similar to the abandoned vineyard. Nevertheless, Principal Component Analysis (PCA) showed that differences in nematode communities were still detectable at the generic level, with some genera occurring solely in one or the other site (e.g. Xiphinema). Thus, soil nematodes indicated a recovery of primary production and decomposition processes in the formerly cultivated vineyard soil, because plant parasites consuming plant tissues decreased, and organic matter breakdown was slower, as in low-input grasslands. Communities of soil nematodes were also compared with intensively cultivated vineyards previously surveyed in Eastern Austria.

Open access

L. Háněl and A. Čerevková

Abstract

Fauna of soil nematodes was studied in three main forest types of the Vihorlat Mountains, Querceto-Fageto-Aceretum at Remetské Hámre (RH), Fagetum at Morské oko (MO), and Fageto-Aceretum at Sninský kameň (SK). Each forest type was represented by five sites. In total 198 species and 98 genera of soil nematodes were distinguished. Most species belonged to rare taxa with the frequency of occurrence lower than 50 %. The number of species and genera decreased from RH (167 species and 86 genera) through MO (115 and 68) to SK (87 and 51). Species and generic richness was significantly positively correlated with soil pH(H2O), negatively with altitude, soil moisture and Cox. Greater part of nematode species and genera belonged to microbivores and to the taxa with higher cp values of 3 – 5. We can conclude that rich nematode fauna indicated undisturbed forest soil condition, nevertheless, the richness decreased with increasing altitude.

Open access

V. Čermák, L. Háněl, V. Gaar and O. Douda

Abstract

Males of Aphelenchoides limberi are described and illustrated for the first time from mushroom plate cultures of Botrytis cinerea. The original parthenogenetic population was extracted from the soil of a hop garden in Senice na Hané, Czech Republic. The males are characterized by a stylet about 11 μm long, a prominent spicula, with the dorsal limb longer than the ventral limb, and a ventrally curved tip. The tail is arcuate, conoid, ending with a short, mostly ventrally bent hook-shaped mucro, the lateral field appears to have four lines under light microscopy.

Open access

V. Čermák, V. Gaar, L. Háněl and K. Široká

Abstract

Composition and vertical distribution of soil nematode communities within soil profile were investigated in eight hop gardens in Czech Republic. In total, the presence of 78 nematode genera was confirmed. Genus Drilocephalobus (Coomans & Coomans, 1990) is new for fauna of the Czech Republic. The highest abundance of soil nematodes was found at a depth of 0–10 cm and declined with increasing depth of soil profile. The most dominant genus was Bitylenchus, followed by genera Acrobeloides, Ditylenchus, Chiloplacus and Cervidelus. Ten genera of plant parasitic nematodes were recorded: Bitylenchus (with prevalence of B. dubius), Helicotylenchus, Heterodera (with absolute prevalence of H. humuli), Geocenamus, Longidorella, Longidorus (only L. elongatus), Merlinius (with prevalence of M. brevidens), Paratylenchus and Pratylenchus. Low population densities of predators and omnivores, low values of the community indices (MI, ΣMI, SI, and CI), and high values of NCR, EI, and PPI/MI ratio indicated disturbed nematode communities in hop gardens and bacteria-dominated decomposition pathways in the soil food web.

Open access

F. Akyazi, A. F. Felek, V. Čermák, M. Čudejková, J. Foit, S. Yildiz and L. Háněl

Abstract

Paratylenchus (Gracilacus) straeleni (De Coninck, 1931) Oostenbrink, 1960 was detected for the first time in Turkey. Our studied population was found in the rhizosphere soil of hazelnut orchards in Ordu. Females and males were studied morphologically and morphometrically by light microscopy and molecularly by sequencing the D2-D3 of the 28S rDNA gene. We present here the morphological and molecular characterisation, phylogenetic analysis of examined population and comparison of variability of worldwide known populations of P. straeleni.