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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Epigėjinių žygių rūšinė sudėtis ir pasiskirstymas Pašilės girininkijos lapuočių medynuose / Species composition and dynamics of adult’s activity of ground beetles (Carabidae) in deciduous forest of Pašilė

Mulerčikas, Povilas 14 January 2009 (has links)
Darbo tikslas: nustatyti žygių rūšinę sudėtį ir pasiskirstymą Pašilės girininkijos lapuočių medynuose. Darbo objektas: Žygiai ( Coleoptera, Carabidae ) Pašilės girininkijos lapuočių medynuose. Darbo metodai: Stebėjimai buvo vykdomi 2007 metais Pašilės girininkijos lapuočių medynuose. Buvo išskirti penki miško tipai (jie skyrėsi augavietės sąlygomis), kuriuose buvo įtaisyta 50 Barberio žeminės gaudyklių. Kiekviename miško tipe nustatoma dominuojanti rūšis, rūšių individų skaičius, dominantų sezoninis aktyvumas, rūšinės įvairovės rodiklis, ekologinė ir zoogeografinė žygių charakteristika. Darbo uždaviniai: vykdyti žygių rinkimą Pašilės girininkijos lapuočių medynuose 2007m., apdoroti gautus duomenis, išanalizuoti žygių rūšinės sudėties ypatumus atskiruose miško tipuose. Darbo rezultatai: Tyrimo metu penkiuose miško tipuose buvo sugauta 11801 žygių, atpažintos 53 žygių rūšys, priklausančios 26 gentims. Tiriant žygių rūšis buvo nustatyta, kad viena jų (Calosoma inquisitor) įrašyta į Lietuvos Raudonąją knygą. Tiriant žygių gausumo sezoninę dinamiką išskirti du pakilimai: gegužės - birželio mėn. ir rugpjūčio mėn.. Žygių rūšinės įvairovės rodiklis atskiruose miško tipuose svyravo nuo 1,411 kiškiakopūstiniame ąžuolyne, iki 2,549 žibuokliniame – kiškiakopūstiniame uosyne. Atliekant tyrimo analizę išryškėjo tendencija, kad rūšinė įvairovė daugiausiai priklauso nuo dirvožemio drėgnumo ir derlingumo. Kuo derlingesnis ir drėgnesnis dirvožemis tuo didesnė žygių rūšinė įvairovė. Remiantis... [toliau žr. visą tekstą] / Object: to define specific composition and distribution of carabid beetles at different forest types at Aukštasis tyras Mire Reserve. Subject: Pašilės Methods: Observations were performed in 2007. At 5 forest types 50 Barber's ground traps were equipped. Dominating species, number of species individuals, seasonal activity of dominating species, index of species variety, ecological and zoographical characteristics of carabid beetles were ascertained at each forest type. Tasks: 1. To set the link between forest type and existing species composition of carabid beetles. 2. To study the subordination between richness of carabid beetles and forest type. Results: During the study at 5 forest types 11801 carabid beetles were caught, 53 species of carabid beetles which belong to 26 genera were recognized. During the study of carabid beetle species it was established that one of them (Calosoma inquisitor) was included into the Red Book of Lithuania. Studying the seasonal dynamics of carabid beetle richness two peaks were set: in may ¬June and August. Carabid beetle species variety at different forest types fluctuated from 1,411 at Oksalido – Quercetum to 2,549 at Hepatico-oksalido Fraxinetum. Making an evaluation of the study a tendency emphasised that species variety mostly depends on soil humidity and productivity. The more productive and humid the soil is, the bigger species variety of carrabid beetles is. Evaluating all collected carabid beetle species according to zoogeographical... [to full text]
2

VARIAÇÕES FLORÍSTICAS E ESTRUTURAIS DE UM REMANESCENTE DE FLORESTA OMBRÓFILA MISTA MONTANA EM NOVA PRATA-RS / STRUCTURAL AND FLORISTIC VARIATIONS IN A REMNANT OF MONTANE MIXED OMBROPHYLOUS FOREST IN NOVA PRATA-RS

Callegaro, Rafael Marian 24 February 2012 (has links)
Conselho Nacional de Desenvolvimento Científico e Tecnológico / This work aimed to analyze floristic and structure variations in a Montane Mixed Ombrophylous Forest remnant, in the county of Nova Prata, RS. It was inventoried 71 parcels with dimensions of 10 x 100 m, using the process of systematic sampling in Two Stages. It were identified and measured all individuals with circumference at breast height ≥ 30,0 cm. The dissertation was divided into two chapters, with specific objectives to analyze the presence of floristic groups (Chapter I) and diagnostic and diagnose structural variations between clusters (Chapter II). The plots were classified by cluster analysis, using the Ward connection method. The plots were classified into four distinct floristic groups that present differences in specific diversity, composition and floristic similarity. The group 3 included the largest area of forest remaining and it had the highest diversity values and species number between groups, and greater floristic similarity with the forest in general. It was observed that different species dominate ecological groups in relation to the structure, favoring the development of specific populations. The aggregate (clustered) distribution pattern was the main pattern of spatial distribution of species obtained in the groups, indicating that the species forming denser spots in the vegetation. The diameter and hypsometric structures proved to be different between groups indicating they have good capacity for renewal and a denser canopy bottom. In summary, the floristic groups of the Montane Mixed Ombrophylous Forest remnant had floristic and structural variations. These variations evidence the need to consider different arboreous communities in the case of an intervention. / O presente trabalho teve como objetivo geral analisar as variações florísticas e estruturais de um remanescente de Floresta Ombrófila Mista Montana, localizado no município de Nova Prata, RS. Para isso, foram inventariadas 71 parcelas, com dimensões de 10 x 100 m, pelo processo de Amostragem Sistemática em Dois Estágios. Foram identificados e mensurados todos os indivíduos com circunferência à altura do peito ≥ 30,0 cm. A dissertação foi dividida em dois capítulos, com os objetivos específicos de analisar a presença de grupos florísticos (Capítulo I) e diagnosticar variações estruturais entre os agrupamentos (Capítulo II). Por meio da análise de agrupamento, utilizando o método de ligação Ward, as parcelas foram classificadas em quatro grupos florísticos distintos, que apresentam diferenças de diversidade específica, composição e similaridade florística. O Grupo 3, que englobou a maior área do remanescente florestal, possui os maiores valores de diversidade e número de espécies entre os grupos, e a maior similaridade florística com a floresta em geral. Em relação à estrutura, constatou-se que diferentes espécies dominam ecologicamente os grupos, favorecendo o desenvolvimento de populações específicas. O principal padrão de distribuição espacial das espécies nos grupos obtidos foi o agregado (agrupado), indicando que as espécies ocorrem formando manchas mais densas na vegetação. As estruturas diamétrica e hipsométrica mostraram-se distintas entre os grupos, e indicam que estes possuem boa capacidade de renovação e um dossel inferior mais denso. Em síntese, os grupos florísticos do remanescente de Floresta Ombrófila Mista Montana apresentam variações florísticas e estruturais, as quais evidenciam a necessidade de se considerar as diferentes comunidades arbóreas no caso de uma intervenção.

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