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Dissertations / Theses on the topic 'Species similarity'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Sohn, Michael, Lingling An, Naruekamol Pookhao, and Qike Li. "Accurate genome relative abundance estimation for closely related species in a metagenomic sample." BioMed Central, 2014. http://hdl.handle.net/10150/610276.

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BACKGROUND:Metagenomics has a great potential to discover previously unattainable information about microbial communities. An important prerequisite for such discoveries is to accurately estimate the composition of microbial communities. Most of prevalent homology-based approaches utilize solely the results of an alignment tool such as BLAST, limiting their estimation accuracy to high ranks of the taxonomy tree.RESULTS:We developed a new homology-based approach called Taxonomic Analysis by Elimination and Correction (TAEC), which utilizes the similarity in the genomic sequence in addition to t

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2

Widman, Elizabeth. "Trait similarity vs species similarity in coral reef ecology : test of improved monitoring methods using Southwest Madagascar reefs." Thesis, University of Warwick, 2012. http://wrap.warwick.ac.uk/57082/.

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Trait-based approaches are emerging in various fields of ecology, and are here developed for coral reefs. ‘Traits’ means biological characteristics of each species; thus closely related species may have different traits and distantly related species may share common traits. This promotes understanding of a system better than using species alone. Chapter One summarizes existing methods, mostly from plant ecology, explores their utility for corals, and an extensive review then extracts candidate Scleractinian traits (Chapter Two). A dataset of 26 key traits from 231 species from Southwest Madaga

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3

Swenson, Nathan Garrick. "The Influence of Phylogenetic and Functional Similarity on Species Coexistence Through Space and Time." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/194918.

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The problem of species diversity and co-existence in hyper-diverse communities remains. Traditionally ecologists have approached this problem from examining patterns of co-occurrence, interaction matrices and abundance distributions. This work, while productive, generally has rarely explored the role of shared ancestry and species-specific quantitative function in promoting species diversity and co-existence. This has been a critical oversight as simply analyzing the list of Latin binomials in an assemblage ignores the relatedness between taxa as well as the diversity in organismal form and f

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4

Luza, André Luís. "Estrutura taxonômica, filogenética e funcional de metacomunidades de pequenos mamíferos não-voadores de ecótonos campo-floresta no sul do Brasil." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/84946.

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Ecótonos campo-floresta no sul do Brasil são originados pela expansão de ecossistemas florestais sobre os campestres, um processo natural gerado por mudanças climáticas de larga escala espacial e temporal. Este processo provoca mudanças vegetacionais que consequentemente modificam os padrões de distribuição, composição e riqueza faunística. Assim, ecótonos campo-floresta são sistemas adequados para inferir sobre a influência de processos históricos, biogeográficos e ecológicos na estruturação de comunidades. Para respondermos questões relacionadas a processos agindo em diferentes escalas espac

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Lemes, Renata. "DIVERSIDADE DE BORBOLETAS (LEPIDOPTERA: HESPERIOIDEA E PAPILIONOIDEA) EM ÁREAS VERDES URBANAS DE SANTA MARIA, RIO GRANDE DO SUL, BRASIL." Universidade Federal de Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/5293.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Urban green areas can provide many feeding resources and conditions to harbor some animal species, especially small ones as insects. To analyze the diversity of butterflies in urban green areas in Santa Maria municipality, state of Rio Grande do Sul, 12 entomological net field samplings were carried out monthly from August 2010 to July 2011 on a gradient of urbanization. Sampling areas were: Presidente Vargas agene (PV) and Itaimbé Park (IP), located downtown, and Cemetery St. Rita (CSR), Mariano da Rocha Hill Monument (MMR) and Do

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Astorga, A. (Anna). "Diversity patterns in marine and freshwater environments:the role of environmental and spatial factors across multiple scales." Doctoral thesis, University of Oulu, 2009. http://urn.fi/urn:isbn:9789514292293.

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Abstract Recognition of the importance of a regional perspective for understanding the structure and dynamics of local assemblages has stimulated the emergence of the field of macroecology. Most attention has been directed to terrestrial ecosystems, while large-scale patterns in biodiversity of aquatic organisms have received less attention. In this thesis I examined patterns of aquatic diversity across several geographic areas and scales, in an effort to understand some of the environmental and spatial factors determining species diversity in aquatic environments. The main objectives of this

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7

Neyret, Margot, Lisa Patrick Bentley, Imma Oliveras, et al. "Examining variation in the leaf mass per area of dominant species across two contrasting tropical gradients in light of community assembly." WILEY-BLACKWELL, 2016. http://hdl.handle.net/10150/621563.

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Understanding variation in key functional traits across gradients in high diversity systems and the ecology of community changes along gradients in these systems is crucial in light of conservation and climate change. We examined inter- and intraspecific variation in leaf mass per area (LMA) of sun and shade leaves along a 3330-m elevation gradient in Peru, and in sun leaves across a forest-savanna vegetation gradient in Brazil. We also compared LMA variance ratios (T-statistics metrics) to null models to explore internal (i.e., abiotic) and environmental filtering on community structure along

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8

SOBRAL, Fernando Landa. "Regras de Assembleia em aves do Cerrado: estrutura funcional em diferentes escalas espaciais." Universidade Federal de Goiás, 2011. http://repositorio.bc.ufg.br/tede/handle/tde/2565.

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Made available in DSpace on 2014-07-29T16:21:18Z (GMT). No. of bitstreams: 1 Dissertacao Fernando Landa Sobral.pdf: 687284 bytes, checksum: 9d1a927bc9b256832a9a05b06ad62d7e (MD5) Previous issue date: 2011-05-26<br>Communities are assemblages of co-occurring species that potentially interact with each other. They are the result not only of a series of ecological processes or "assembly rules", but also of past and ongoing evolutionary processes. In recent years, the assembly rules have received increased attention from ecologists and two different processes have been explored: environmental fi

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9

Zorzanelli, João Paulo Fernandes. "Florística e estrutura de um fragmento de Floresta Montana na Serra do Valentim, Iúna, Espírito Santo." Universidade Federal do Espírito Santo, 2012. http://repositorio.ufes.br/handle/10/5776.

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Made available in DSpace on 2016-12-23T13:51:45Z (GMT). No. of bitstreams: 1 Joao Paulo Fernandes Zorzanelli.pdf: 1847176 bytes, checksum: 78cb79a7776f3d01fe02a7b8991b5b16 (MD5) Previous issue date: 2012-08-30<br>Os objetivos deste estudo foram listar as espécies de um trecho de Floresta Ombrófila Montana Serra do Valentim, verificar a distribuição geográfica das mesmas e analisar a estrutura e similaridade florística. Foram coletados materiais botânicos férteis de árvores, arbustos, ervas, epífitas, trepadeiras e lianas ao longo de trilhas e picadas em 25 idas a campo entre os anos de 2011

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10

Hess, Manon. "Restauration écologique des communautés végétales après éradication d'espèces invasives : Rôle de la dynamique de colonisation et des effets de priorité Using limiting similarity to enhance invasion resistance: theoretical and practical concerns Priority effects: Emerging principles for invasive plant species management Giving recipient communities a greater head start and including productive species boosts early resistance to invasion." Thesis, Avignon, 2020. http://www.theses.fr/2020AVIG0357.

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Les plantes invasives posent d’importants problèmes environnementaux et de santé publique, et leur contrôle est aujourd’hui un défi majeur. Elles rencontrent des conditions particulièrement favorables après des perturbations conduisant à une suppression du couvert végétal. La mise en place d’un couvert végétal séquestrant rapidement ces ressources parait alors une réponse probante pour réduire l’invasion. Néanmoins, les caractéristiques des communautés nécessaires pour exercer une résistance efficace dans les premières phases d’installation sont encore peu connues.Je me suis intéressée à deux

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Pereira, Karla Conceição. "Inventário ictiofaunístico de dois rios de altitude do planalto serrano catarinense, alto rio Uruguai, Brasil." Universidade Federal de São Carlos, 2008. https://repositorio.ufscar.br/handle/ufscar/1630.

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Made available in DSpace on 2016-06-02T19:29:13Z (GMT). No. of bitstreams: 1 2219.pdf: 2636359 bytes, checksum: f0645ac8007040cc7b64491af2575c03 (MD5) Previous issue date: 2008-11-24<br>Universidade Federal de Sao Carlos<br>The fish presence and abundance in local assemblies are influenced by several biotic and non-biotic factors, which work and interact in different spatial and temporal scales (MATTHEWS, 1998). The present study aimed at performing the ichthyologic inventory in the headwaters of the rivers Caronas (Pelotas River basin) and Caveiras (Canoas River basin), sub-basins from the

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12

Lautert, Mayara. "Licófitas e samambaias em quatro unidades de conservação de mata atlântica no oeste do Paraná, Brasil." Universidade Estadual do Oeste do Parana, 2014. http://tede.unioeste.br:8080/tede/handle/tede/697.

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Made available in DSpace on 2017-07-10T14:38:24Z (GMT). No. of bitstreams: 1 Dissertacao_final_Mayara_Lautert_pdf.pdf: 7030675 bytes, checksum: 86c906585a7de9f11121d0b7b2fdfcb5 (MD5) Previous issue date: 2014-08-27<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This study aimed to survey lycophyte and fern species in 4 forest fragments in western Paraná, Brazil, and it compares them to other plant formations from the Atlantic Forest biome in southern Brazil. In fragments in western Paraná, 5 lycophyte species were registered, distributed into 2 families and 2 genera. In ad

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13

Akter, Shamima. "Identification of common and unique stress responsive genes of Arabidopsis thaliana under different abiotic stress through RNA-Seq meta-analysis." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/82036.

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Abiotic stress is a major constraint for crop productivity worldwide. To better understand the common biological mechanisms of abiotic stress responses in plants, we performed meta-analysis of 652 samples of RNA sequencing (RNA-Seq) data from 43 published abiotic stress experiments in Arabidopsis thaliana. These samples were categorized into eight different abiotic stresses including drought, heat, cold, salt, light and wounding. We developed a multi-step computational pipeline, which performs data downloading, preprocessing, read mapping, read counting and differential expression analyses for

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14

Li, Yuanzhi. "Structure et dynamique d'occupation de l'espace fonctionnel à travers des gradients spatiaux et temporels." Thèse, Université de Sherbrooke, 2017. http://hdl.handle.net/11143/11615.

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Les modèles d'occupation de niche au sein des communautés locales, la variabilité spatiale de la biodiversité le long des gradients environnementaux du stress et des perturbations, et les processus de succession végétale sont plusieurs sujets fondamentaux en écologie. Récemment, l'approche basée sur les traits est apparue comme un moyen prometteur de comprendre les processus structurant les communautés végétales et cette approche a même été proposée comme méthode pour reconstruire l'écologie communautaire en fonction des traits fonctionnels. Par conséquent, lier ces thèmes fondamentaux en util

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15

Belghith, Akram. "Indexation de spectres HSQC et d’images IRMf appliquée à la détection de bio-marqueurs." Thesis, Strasbourg, 2012. http://www.theses.fr/2012STRAD001/document.

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Les techniques d'acquisition des signaux médicaux sont en constante évolution et fournissent une quantité croissante de données hétérogènes qui doivent être analysées par le médecin. Dans ce contexte, des méthodes automatiques de traitement des signaux médicaux sont régulièrement proposées pour aider l'expert dans l'analyse qualitative et quantitative en facilitant leur interprétation. Ces méthodes doivent tenir compte de la physique de l'acquisition, de l'a priori que nous avons sur ces signaux et de la quantité de données à analyser pour une interprétation plus précise et plus fiable. Dans c

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16

Belghith, Akram. "Indexation de spectres HSQC et d'images IRMf appliquée à la détection de bio-marqueurs." Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00712070.

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Les techniques d'acquisition des signaux médicaux sont en constante évolution et fournissent une quantité croissante de données hétérogènes qui doivent être analysées par le médecin. Dans ce contexte, des méthodes automatiques de traitement des signaux médicaux sont régulièrement proposées pour aider l'expert dans l'analyse qualitative et quantitative en facilitant leur interprétation. Ces méthodes doivent tenir compte de la physique de l'acquisition, de l'a priori que nous avons sur ces signaux et de la quantité de données à analyser pour une interprétation plus précise et plus fiable. Dans c

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17

Hsin-Rung, Yen, and 葉新榮. "Statistical Estimator of Species Similarity Index." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/g8j4vk.

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碩士<br>國立嘉義大學<br>應用數學系研究所<br>97<br>In environmental ecology, the ecologists are interest in the species structure of two assemblages, such as the number of shared species or their similarity of the two assem-blages. However, shared species richness only consider the species appear or not, but it ignores their relative abundance. Morisita (1959) proposes the similarity index which not only considering the number of species but also including the relative abundance of species. Morisita (1959) and Horn (1966) propose the different estimators of similarity index, respectively. Their estimators are

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18

Ying-Jhen, Lin, and 林瑛真. "Statistical Analysis of Species Similarity Indices." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/17682125707729536983.

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碩士<br>國立嘉義大學<br>應用數學系研究所<br>98<br>In the ecology, it is the important topic for the compariosn of two assemblages, mainly using the similarity indices to measure their similarity of two assemblages. The similarity indices can be divided into two types, the incidence indices and the abundance indices. The content of this paper is divided into three parts. In the first part, we discuss the range, the linear and invariable properties of incidence indices, and then derive the order of incidence indices. In the second part, we will introduce the way that the abundance indices would be transform

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Li, Pi-Chiang, and 李丕強. "Species Estimation and Similarity Indices in Quadrat Sampling." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/27752671832224289581.

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20

Yeh, Wei-Ming, and 葉偉珉. "Analysis of Species by Similarity Spatial Functional Data Approach." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/33159844353790461341.

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碩士<br>國立中興大學<br>統計學研究所<br>104<br>Measures of species diversity play an important role in biology and ecology. The most commonly employed measures of species diversity are richness and number of species. In this paper we defined a new species with regard to spatial distribution by using Functional Principal Component Analysis (FPCA).

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詹惠婷. "Comparisons of Estimations of the Number of Shared Species and Similarity." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/68042128965907179606.

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22

Ma, Kuang Hui, and 馬光輝. "Rarefaction and extrapolation of similarity/differentiation measures and species diversity in sampling without replacement." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/na5355.

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博士<br>國立清華大學<br>統計學研究所<br>104<br>How to assess and quantify species compositional (dis)similarity among communities has been a central objective in ecology. Although a large number of (dis)similarity measures have been published, only the Horn index (Horn 1966), or normalized mutual information, satisfies the essential monotonicity property. Empirical estimate of the Horn index depends strongly on sample sizes and may be subject to large bias. Based on sampling data, this thesis applies Good-Turing frequency formula to derive an analytic estimator of the Horn index under any community weight p

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23

Chen, Tsz-Fu, and 陳賜福. "Detection of Genetic Similarity by Molecular Markers in Green Bamboo (Bambusa oldhamii) and Related Species in the Genus of Bambusa." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/39231547067745136706.

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碩士<br>臺灣大學<br>園藝學研究所<br>95<br>Both random amplified polymorphic DNA (RAPD) and inter simple sequence repeat markers (ISSR) assays were applied to detect the molecular variation among green bamboo (Bambusa oldhamii) accessions grown in cultivation and among Bambusa spp. collection from a park. A total of 96 B. oldhamii accessions were tested with 73 decamer oligonucleotide primers and only monomorphic fragments were generated. Accessions from northern and from southern Taiwan were assessed separately and assessed together in different tests and only primers with distinct and reproducible bands

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24

Hurley, Sarah S. "The detection of Mycobacterium paratuberculosis using DNA probes and the genetic similarity of M. paratuberculosis DNA to the DNA of other mycobacterial species." 1988. http://catalog.hathitrust.org/api/volumes/oclc/18540159.html.

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25

"Statistical validation of limiting similarity and negative co-occurrence null models : Extending the models to gain insights into sub-community patterns of community assembly." Thesis, 2014. http://hdl.handle.net/10388/ETD-2014-09-1715.

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Competition between species is believed to lead to patterns of either competitive exclusion or limiting similarity within ecological communities; however, to date the amount of support for either as an outcome has been relatively weak. The two classes of null model commonly used to assess co-occurrence and limiting similarity have both been well studied for statistical performance; however, the methods used to evaluate their performance, particularly in terms of type II statistical errors, may have resulted in the underreporting of both patterns in the communities tested. The overall purpose o

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Gakwerere, François. "An investigation of the level of selected trace metals in plant species within the vicinity of tantalum mining area in Gatumba, Ngororero District, Rwanda." Diss., 2013. http://hdl.handle.net/10500/8834.

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Due to mining activities, the natural vegetation cover in Gatumba area was removed and replaced either by crops or bare wasteland with reduced available arable land. The main aim of the study was to assess the impact of the mining activities on the plant mineral uptake and the dynamics of the vegetation. The vegetation in this area under investigation was diversified and heterogeneous. Trace element concentrations in soils were similar to those in plant parts but some elements were highly concentrated in soils than in plants. According to the bioaccumulation factors of the analyzed trace eleme

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27

Kluth, Christian. "Zentrale und periphere Populationen von Hornungia petraea: Biodiversität und Demographie auf unterschiedlichen raum-zeitlichen Skalenebenen." Doctoral thesis, 2004. http://hdl.handle.net/11858/00-1735-0000-0006-B699-D.

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