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2073. Poročilo o preskusu št.: LVG 2020-032 : opis vzorca: 11499497: Feromonska vaba, vektor, 11499480: Feromonska vaba, vektor, 11499473: Feromonska vaba, vektor, 11499466: Feromonska vaba, vektor, 11499459: Feromonska vaba, vektor, 11499299: Feromonska vaba, vektor, 11499442: Feromonska vaba, vektor, 11499435: Feromonska vaba, vektor : namen testiranja: sum na: 11499497: sum na: Gibberella circinata, 11499480: sum na: Gibberella circinata, 11499473: sum na: Gibberella circinata, 11499466: sum na: Gibberella circinata, 11499459: sum na: Gibberella circinata, 11499299: sum na: Gibberella circinata, 11499442: sum na: Gibberella circinata, 11499435: sum na: Gibberella circinataNikica Ogris, Barbara Piškur, Andreja Kavčič, Zina Devetak, Špela Jagodic, 2020, expertise, arbitration decision Keywords: varstvo gozdov, morfološke analize, borov smolasti rak, vektorji, Fusarium circinatum, Gibberella circinata, Pinus sp., feromonska vaba, žuželke
Published in DiRROS: 26.05.2020; Views: 1726; Downloads: 0 |
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2076. Patterns of understory community assembly and plant trait-environment relationships in temperate SE European forestsJanez Kermavnar, Lado Kutnar, 2020, original scientific article Abstract: We analyzed variation in the functional composition and diversity of understory plant communities across different forest vegetation types in Slovenia. The study area comprises 10 representative forest sites covering broad gradients of environmental conditions (altitude, geology, light availability, soil type and reaction, nutrient availability, soil moisture), stand structural features and community attributes. The mean and variation of the trait values were quantified by community-weighted means and functional dispersion for four key plant functional traits: plant height, seed mass, specific leaf area and leaf dry matter content. At each study site, forest vegetation was surveyed at two different spatial scales (4 and 100 m2 ) in order to infer scale-dependent assembly rules. Patterns of community assembly were tested with a null model approach. We found that both trait means and diversity values responded to conspicuous gradients in environmental conditions and species composition across the studied forests. Our results mainly support the idea of abiotic filtering: more stressful environmental conditions (e.g., high altitude, low soil pH and low nutrient content) were occupied by communities of low functional diversity (trait convergence), which suggests a selective effect for species with traits adapted to such harsh conditions. However, trait convergence was also detected in some more resource-rich forest sites (e.g., low altitude, high soil productivity), most likely due to the presence of competitive understory species with high abundance domination. This could, at least to some extent, indicate the filtering effect of competitive interactions. Overall, we observed weak and inconsistent patterns regarding the impact of spatial scale, suggesting that similar assembly mechanisms are operating at both investigated spatial scales. Our findings contribute to the baseline understanding of the role of both abiotic and biotic constraints in forest community assembly, as evidenced by the non-random patterns in the functional structure of distinct temperate forest understories.
Keywords: functional composition, functional diversity, ecological gradients, abiotic filtering, trait convergence, trait divergence, spatial scale, forest ground-layer vegetation, Slovenia
Published in DiRROS: 26.05.2020; Views: 1904; Downloads: 1267
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2077. Eutypella parasitica and other frequently isolated fungi in wood of dead branches of young Sycamore Maple (Acer pseudoplatanus) in SloveniaAna Brglez, Barbara Piškur, Nikica Ogris, 2020, original scientific article Abstract: Eutypella parasitica R.W. Davidson and R.C. Lorenz is the causative agent of Eutypella canker of maple, a destructive disease of maples in Europe and North America. The fungus E. parasitica infects the trunk through a branch stub or bark wound. Because the fungal community may have an impact on infection and colonization by E. parasitica, the composition of fungi colonizing wood of dead branches of sycamore maple (Acer pseudoplatanus L.) was investigated in five sampling sites in Slovenia. Forty samples from each sampling site were collected between the November 2017 and March 2018 period. Isolations were made from the wood in the outer part of dead branches and from discoloured wood in the trunk that originated from a dead branch. Pure cultures were divided into morphotypes, and one representative culture per morphotype was selected for further molecular identification. From a total of 2700 cultured subsamples, 1744 fungal cultures were obtained, which were grouped into 212 morphotypes. The investigated samples were colonized by a broad spectrum of fungi. The most frequently isolated species were Eutypa maura (Fr.) Sacc., Eutypa sp. Tul. and C. Tul., Fusarium avenaceum (Fr.) Sacc., Neocucurbitaria acerina Wanas., Camporesi, E.B.G. Jones and K.D. Hyde and E. parasitica. In this study, we distinguished species diversity and the fungal community. There were no significant differences in the diversity of fungal species between the five sampling sites, and branch thickness did not prove to be a statistically significant factor in fungal species diversity. Nevertheless, relatively low Jaccard similarity index values suggested possible differences in the fungal communities from different sampling sites. This was confirmed by an analysis of similarities, which showed that the isolated fungal community distinctly differed between the five sampling sites and between the different isolation sources. Eutypella parasitica was isolated from all five investigated sampling sites, although Eutypella cankers were observed in only three sampling sites, indicating the possibility of asymptomatic infection.
Keywords: fungal composition, invasive species, diversity, fungal communities, molecular identification, frequencies, Jaccard similarity index, Eutypella parasitica, analysis of similarities, colonization
Published in DiRROS: 26.05.2020; Views: 2077; Downloads: 1227
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