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Flora da Cerca do Mosteiro de Tibães: contributo para a valorização e divulgação do seu património florístico

Gomes, Pedro Manuel da Cunha Taveira
Fonte: Universidade de Coimbra Publicador: Universidade de Coimbra
Tipo: Dissertação de Mestrado
POR
Relevância na Pesquisa
25.98%
O Mosteiro de Tibães, antiga Casa Mãe da “Congregação dos Monges Negros de São Bento dos Reinos de Portugal”, situado no Norte de Portugal, mais propriamente no concelho de Braga, é envolto pela sua Cerca – um conjunto de matas, jardins e campos agrícolas delimitados por um muro. Esta tese teve como objectivos o estudo florístico das plantas vasculares presentes na Cerca; o desenvolvimento de material de divulgação das suas plantas para o público e a enumeração de um conjunto de actividades que poderão ser desenvolvidas no futuro, para efeitos de educação ambiental. Ao longo dos vários caminhos que percorrem a Cerca, foram identificadas 195 espécies de plantas vasculares, pertencentes a 167 géneros de 70 famílias botânicas. As plantas foram registadas em fotografia, em digitalizações em fundo preto e/ou num herbário. Também foi elaborada uma proposta para um guia de identificação das árvores. Por fim, foi enumerado um conjunto de actividades com as plantas da Cerca. Com este material de divulgação e com as actividades, pretende-se aumentar a aproximação do público à Natureza, de modo a que as pessoas possam assimilar diversos aspectos ligados à diversidade de plantas; para conhecerem melhor as florestas e as espécies que normalmente aí ocorrem e para conhecerem as espécies invasoras e os seus perigos para os habitats naturais.; The Monastery of Tibães...

Florística vascular não arbórea da reserva particular do patrimônio natural Paiol Maria, São Lourenço da Serra, SP

Saka, Mariana Naomi
Fonte: Universidade Estadual Paulista (UNESP) Publicador: Universidade Estadual Paulista (UNESP)
Tipo: Dissertação de Mestrado Formato: 35 f. : il., tabs.
POR
Relevância na Pesquisa
35.79%
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Pós-graduação em Ciências Biológicas (Biologia Vegetal) - IBRC; A Reserva Particular do Patrimônio Natural Paiol Maria, São Lourenço da Serra, SP, possui 76 ha e localiza-se no Corredor de Biodiversidade da Serra do Mar, considerado uma área prioritária para conservação e um importante centro de endemismo. Foram coletadas 332 espécies de plantas vasculares não arbóreas distribuídas em 85 famílias, sendo aproximadamente 80% de Angiospermas e 20% de Monilophyta s.l. Em relação ao hábito, a maioria é herbácea (47%), seguido de epífitas, arbustivas e trepadeiras (20%, 18% e 15%, respectivamente). Do total de espécies, 87 são endêmicas da Mata Atlântica, 205 são nativas do Brasil, mas não endêmicas deste bioma, 29 ainda não estão identificadas a nível de espécie e 11 não são nativas da flora brasileira. As espécies endêmicas estão representadas principalmente pelas epífitas e arbustivas, sendo Orchidaceae e Melastomataceae duas das famílias mais diversas e com grande número de espécies endêmicas. Dentre as espécies não nativas, a maioria foi considerada naturalizada ou invasora. Youngia japonica (L.)DC., Curculigo capitulata Kunze...

Estrutura, origem e desenvolvimento de laticíferos e coléteres em plantas de Tabernaemontana catharinensis A.DC. (Rauvolfioideae, Apocynaceae) em diferentes fases do desenvolvimento vegetativo

Canaveze, Yve
Fonte: Universidade Estadual Paulista (UNESP) Publicador: Universidade Estadual Paulista (UNESP)
Tipo: Dissertação de Mestrado Formato: 89 f.
POR
Relevância na Pesquisa
15.88%
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Pós-graduação em Ciências Biológicas (Botânica) - IBB; Laticíferos e coléteres são estruturas secretoras comuns em Apocynaceae e tendo sido registrados em órgãos vegetativos e reprodutivos em diferentes gêneros. Tabernaemontana catharinensis A.DC. é uma espécie de Apocynaceae, conhecida como leiteira ou casca-de-cobra, amplamente usada na medicina popular e com atividade medicinal comprovada. É planta heliófita, comum em áreas degradadas, pastagens e como invasora de cultivos, sendo amplamente distribuída no Brasil. Este trabalho teve como objetivo estudar a estrutura, origem e desenvolvimento de laticíferos e coléteres em plantas de T. catharinensis em diferentes fases do desenvolvimento vegetativo. Para este estudo foram analisados embriões maduros, plântulas aos 20 dias e plantas aos 80 dias após a germinação. Laticíferos dos tipos articulados anastomosados e não-anastomosados com crescimento intrusivo e, possivelmente, laticíferos não-articulados ramificados ocorrem em todos os estágios analisados. A fase meristemática dos laticíferos é breve e sua função secretora em regiões próximas ao promeristema foi confirmada histoquimicamente. Grãos protéicos...

Copping with extreme dehydration:a physiological, biochemical and molecular study on the aquatic bryophyte Fontinalis antipyretica

Carvalho, Ricardo da Cruz de, 1980-
Fonte: Universidade de Lisboa Publicador: Universidade de Lisboa
Tipo: Tese de Doutorado
Publicado em //2013 ENG
Relevância na Pesquisa
25.84%
Tese de doutoramento, Biologia (Fisiologia e Bioquímica), Universidade de Lisboa, Faculdade de Ciências, 2013; Water is the most important element for life. During land invasion, the first plants had to face an extreme dry environment, undergoing desiccation, a process in which tissues virtually lose almost all water. Therefore, plants developed desiccation tolerance (DT) mechanisms through which they could experience the dry state and return to normal function upon rehydration. Nowadays, the organisms that have the ability to tolerate desiccation include members of different taxa such as microbes, lichens, bryophytes, vascular plants and animals. Nevertheless, DT is more frequent in lichens and bryophytes. Researchers have been closely studying DT mechanisms hoping to identify new genes that can be transferred through biotechnology to crop species, increasing their drought tolerance. In the Mediterranean region, the aquatic species Fontinalis antipyretica is periodically exposed to desiccation, in intermittent streams that lose their water during the dry season. Field observations suggest DT mechanisms in this aquatic bryophyte. The main objective of this Thesis is to study DT through the combination of physiological...

Invasive alien species in Macaronesia

Silva, Luís; Ojeda Land, Elizabeth; Rodriguez Luengo, Juan L.; Borges, Paulo A. V.; Oliveira, Paulo; Jardim, Roberto
Fonte: Arena Publicador: Arena
Tipo: Parte de Livro
Publicado em //2008 ENG
Relevância na Pesquisa
45.8%
"[…]. As a consequence of all the geographic conditions and of historical events, the Canaries show the richest biodiversity. As an example, regarding endemic taxa, the Canaries have 524 vascular plants and 2768 arthropods (Martín Esquivel et al. 2005) while the Azores have 72 and 267, respectively (Borges et al. 2005) and the archipelagos of Madeira and Selvagens altogether have 154 and 979 (Borges et al. 2008a) respectively. It is well known that there are several plant genera in the Canaries with high numbers of species (Aeonium, Echium, Argyranthemum, Sonchus, etc.), which probably resulted from adaptive radiation, while in the Azores endemic plant species are found at a rate of one, and more rarely two or three species per genus. An intermediate situation is found in Madeira where genera Argyranthemum (Asteraceae) and Sinapidendron (Brassicaceae) show six endemic taxa (Jardim & Sequeira 2008). There are also other significant differences among the archipelagos. For instance, regarding vertebrate taxa, in the Azores there are no native species of reptiles and there are only two native mammal species, two bats, one of which endemic (Nyctalus azoreum), while there are several species in those groups both in the Canaries and in Madeira...

Distribution, feeding behavior and control strategies of the exotic land snail Achatina fulica (Gastropoda: Pulmonata) in the northeast of Brazil

Albuquerque,FS.; Peso-Aguiar,MC.; Assunção-Albuquerque,MJT.
Fonte: Instituto Internacional de Ecologia Publicador: Instituto Internacional de Ecologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/11/2008 EN
Relevância na Pesquisa
35.71%
The goal of this study was to document the distribution and establishment A. fulica such as their feeding preference and behavior in situ. The study was carried out at the city of Lauro de Freitas, Bahia state, Brazil, between November 2001 and November 2002. We used catch per unit effort methods to determine abundance, distribution, habitat choice and food preferences. The abundance and distribution of A. fulica was most representative in urban area, mainly near to the coastline. Lots and house gardens were the most preferred sites during active hours. The results indicated that A. fulica started their activity at the end of the evening and stopped in mid-morning. Their preferred food were vascular plants such as Hibiscus syriacus, Ricinus communis, Carica papaya, Galinsonga coccinea, Lippia alba, Ixora coccinea, Musa parasidisiaca, Mentha spicata and Cymbopogon citrates. Our results indicate that A. fulica are well adapted and established in this city and modified environments facilitate their establishment and dispersion. However, human perturbation, such as clearance of lots could be limiting for the persistence of A. fulica populations.

InBUy database of Invasive and Alien Species (IAS) in Uruguay: a useful tool to confront this threat to biodiversity

Masciadri,Silvana; Brugnoli,Ernesto; Muniz,Pablo
Fonte: Instituto Virtual da Biodiversidade | BIOTA - FAPESP Publicador: Instituto Virtual da Biodiversidade | BIOTA - FAPESP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2010 EN
Relevância na Pesquisa
35.88%
In Uruguay, as well as in other regions of the world, IAS cause negative impacts on natural and managed ecosystems. The use of databases is a helpful tool to elaborate different strategies for prevention and control, and to develop policies and scientific analyses related to IAS. The database of IAS in Uruguay (InBUy) was developed during two time periods (2006-2007 and 2009-2010). It currently contains information on 33 specialists of different taxonomic groups, 14 research projects, 185 references, 351 species and 4,715 records, with vascular plants having both the highest number of species and records. Among vascular plants, herbaceous life forms are the most strongly represented, followed by trees and shrubs. Within animals, the fishes and mollusks are the most important groups. Analysis of the native distribution areas of IAS showed that most are indigenous from Europe, followed by Asia and Oceania. Data showed that introductions of IAS into Uruguay are mainly intentional (67%), so efforts should be focused on policies and rules in order to control the entrance of exotic organisms and prevent new invasions. The geography of the compiled dataset shows the main impact is along the coastline, where the highest exotic species richness and records occurs...

Preventing Establishment: An Inventory of Introduced Plants in Puerto Villamil, Isabela Island, Galapagos

Guézou, Anne; Pozo, Paola; Buddenhagen, Christopher
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 17/10/2007 EN
Relevância na Pesquisa
25.79%
As part of an island-wide project to identify and eradicate potentially invasive plant species before they become established, a program of inventories is being carried out in the urban and agricultural zones of the four inhabited islands in Galapagos. This study reports the results of the inventory from Puerto Villamil, a coastal village representing the urban zone of Isabela Island. We visited all 1193 village properties to record the presence of the introduced plants. In addition, information was collected from half of the properties to determine evidence for potential invasiveness of the plant species. We recorded 261 vascular taxa, 13 of which were new records for Galapagos. Most of the species were intentionally grown (cultivated) (73.3%) and used principally as ornamentals. The most frequent taxa we encountered were Cocos nucifera (coconut tree) (22.1%) as a cultivated plant and Paspalum vaginatum (salt water couch) (13.2%) as a non cultivated plant. In addition 39 taxa were naturalized. On the basis of the invasiveness study, we recommend five species for eradication (Abutilon dianthum, Datura inoxia, Datura metel, Senna alata and Solanum capsicoides), one species for hybridization studies (Opuntia ficus-indica) and three species for control (Furcraea hexapetala...

Time since Introduction, Seed Mass, and Genome Size Predict Successful Invaders among the Cultivated Vascular Plants of Hawaii

Schmidt, John Paul; Drake, John M.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 02/03/2011 EN
Relevância na Pesquisa
35.94%
Extensive economic and environmental damage has been caused by invasive exotic plant species in many ecosystems worldwide. Many comparative studies have therefore attempted to predict, from biological traits, which species among the pool of naturalized non-natives become invasive. However, few studies have investigated which species establish and/or become pests from the larger pool of introduced species and controlled for time since introduction. Here we present results from a study aimed at quantifying predicting three classes of invasive species cultivated in Hawaii. Of 7,866 ornamental species cultivated in Hawaii between 1840 and 1999, 420 (5.3%) species naturalized, 141 (1.8%) have been classified as weeds, and 39 (0.5%) were listed by the state of Hawaii as noxious. Of the 815 species introduced >80 years ago, 253 (31%) have naturalized, 90 (11%) are classed as weeds, and 22 (3%) as noxious by the state of Hawaii. Using boosted regression trees we classified each group with nearly 90% accuracy, despite incompleteness of data and the low proportion of naturalized or pest species. Key biological predictors were seed mass and highest chromosome number standardized by genus which, when data on residence time was removed, were able to predict all three groups with 76–82% accuracy. We conclude that...

Why Are Some Plant Genera More Invasive Than Others?

Schmidt, John Paul; Drake, John M.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 11/04/2011 EN
Relevância na Pesquisa
36.02%
Determining how biological traits are related to the ability of groups of organisms to become economically damaging when established outside of their native ranges is a major goal of population biology, and important in the management of invasive species. Little is known about why some taxonomic groups are more likely to become pests than others among plants. We investigated traits that discriminate vascular plant genera, a level of taxonomic generality at which risk assessment and screening could be more effectively performed, according to the proportion of naturalized species which are pests. We focused on the United States and Canada, and, because our purpose is ultimately regulatory, considered species classified as weeds or noxious. Using contingency tables, we identified 11 genera of vascular plants that are disproportionately represented by invasive species. Results from boosted regression tree analyses show that these categories reflect biological differences. In summary, approximately 25% of variation in genus proportions of weeds or noxious species was explained by biological covariates. Key explanatory traits included genus means for wetland habitat affinity, chromosome number, and seed mass.

The Membrane Mucin Msb2 Regulates Invasive Growth and Plant Infection in Fusarium oxysporum[W]

Pérez-Nadales, Elena; Di Pietro, Antonio
Fonte: American Society of Plant Biologists Publicador: American Society of Plant Biologists
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
25.8%
This study examines the activation of a conserved mitogen-activated protein kinase (MAPK) cascade that is essential for fungal pathogenicity in plants. A highly glycosylated mucin-like transmembrane protein is shown to contribute to phosphorylation of the MAPK that promotes invasive growth and virulence in the soilborne vascular wilt fungus Fusarium oxysporum.

A nitrogen response pathway regulates virulence in plant pathogenic fungi: Role of TOR and the bZIP protein MeaB

López-Berges, Manuel S; Rispail, Nicolas; Prados-Rosales, Rafael C; Di Pietro, Antonio
Fonte: Landes Bioscience Publicador: Landes Bioscience
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
15.89%
Virulence in plant pathogenic fungi is controlled through a variety of cellular pathways in response to the host environment. Nitrogen limitation has been proposed to act as a key signal to trigger the in planta expression of virulence genes. Moreover, a conserved Pathogenicity mitogen activated protein kinase (MAPK) cascade is strictly required for plant infection in a wide range of pathogens. We investigated the relationship between nitrogen signaling and the Pathogenicity MAPK cascade in controlling infectious growth of the vascular wilt fungus Fusarium oxysporum. Several MAPK-activated virulence functions such as invasive growth, vegetative hyphal fusion and host adhesion were strongly repressed in the presence of the preferred nitrogen source ammonium. Repression of these functions by ammonium was abolished by L-Methionine sulfoximine (MSX) or rapamycin, two specific inhibitors of Gln synthetase and the protein kinase TOR (Target Of Rapamycin), respectively, and was dependent on the bZIP protein MeaB. Supplying tomato plants with ammonium rather than nitrate resulted in a significant delay of vascular wilt symptoms caused by the F. oxysporum wild type strain, but not by the ΔmeaB mutant. Ammonium also repressed invasive growth in two other pathogens...

Europe’s other debt crisis caused by the long legacy of future extinctions

Dullinger, Stefan; Essl, Franz; Rabitsch, Wolfgang; Erb, Karl-Heinz; Gingrich, Simone; Haberl, Helmut; Hülber, Karl; Jarošík, Vojtech; Krausmann, Fridolin; Kühn, Ingolf; Pergl, Jan; Pyšek, Petr; Hulme, Philip E.
Fonte: National Academy of Sciences Publicador: National Academy of Sciences
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
25.79%
Rapid economic development in the past century has translated into severe pressures on species survival as a result of increasing land-use change, environmental pollution, and the spread of invasive alien species. However, though the impact of these pressures on biodiversity is substantial, it could be seriously underestimated if population declines of plants and animals lag behind contemporary environmental degradation. Here, we test for such a delay in impact by relating numbers of threatened species appearing on national red lists to historical and contemporary levels of socioeconomic pressures. Across 22 European countries, the proportions of vascular plants, bryophytes, mammals, reptiles, dragonflies, and grasshoppers facing medium-to-high extinction risks are more closely matched to indicators of socioeconomic pressures (i.e., human population density, per capita gross domestic product, and a measure of land use intensity) from the early or mid-, rather than the late, 20th century. We conclude that, irrespective of recent conservation actions, large-scale risks to biodiversity lag considerably behind contemporary levels of socioeconomic pressures. The negative impact of human activities on current biodiversity will not become fully realized until several decades into the future. Mitigating extinction risks might be an even greater challenge if temporal delays mean many threatened species might already be destined toward extinction.

Belowground plant development measured with magnetic resonance imaging (MRI): exploiting the potential for non-invasive trait quantification using sugar beet as a proxy

Metzner, Ralf; van Dusschoten, Dagmar; Bühler, Jonas; Schurr, Ulrich; Jahnke, Siegfried
Fonte: Frontiers Media S.A. Publicador: Frontiers Media S.A.
Tipo: Artigo de Revista Científica
Publicado em 16/09/2014 EN
Relevância na Pesquisa
25.84%
Both structural and functional properties of belowground plant organs are critical for the development and yield of plants but, compared to the shoot, much more difficult to observe due to soil opacity. Many processes concerning the belowground plant performance are not fully understood, in particular spatial and temporal dynamics and their interrelation with environmental factors. We used Magnetic Resonance Imaging (MRI) as a noninvasive method to evaluate which traits can be measured when a complex plant organ is monitored in-vivo while growing in the soil. We chose sugar beet (Beta vulgaris ssp. vulgaris) as a model system. The beet consists mainly of root tissues, is rather complex regarding tissue structure and responses to environmental factors, and thereby a good object to test the applicability of MRI for 3D phenotyping approaches. Over a time period of up to 3 months, traits such as beet morphology or anatomy were followed in the soil and the effect of differently sized pots on beet fresh weight calculated from MRI data was studied. There was a clear positive correlation between the pot size and the increase in fresh weight of a sugar beet over time. Since knowledge of the development of internal beet structures with several concentric cambia...

Invasion of Portuguese coastal dunes by Acacia longifolia : impacts on soil ecology

Marchante, Elizabete Maria Duarte Canas
Fonte: Universidade de Coimbra Publicador: Universidade de Coimbra
Tipo: Tese de Doutorado
ENG
Relevância na Pesquisa
16.13%
Invasion by alien species is considered one of the main threats to the world's biodiversity, causing extensive ecological, economical, and social impacts. In particular, impacts on soil ecology may be relevant, with consequences for ecosystem processes and services. In Continental Portugal, more than 15 % of the vascular flora is exotic, with about 40 % of the alien species considered potentially or actually invasive. Some of the worst invasive plants in Portugal are leguminous trees of the genus Acacia. This work aims to contribute to better understand and quantify impacts of invasive plants on ecosystem processes, considering time since invasion and impacts on the belowground sub-system. The study area is located in the São Jacinto Dunes Nature Reserve where Acacia longifolia (Andrews) Willd displays invasive behaviour. Some areas have been continuously occupied by this invasive species for more than 20 years (longinvaded areas); other areas were invaded by A. longifolia after 1995 (recently-invaded areas) and others have native vegetation (non-invaded areas). The main objectives of this thesis are: 1) to evaluate the impacts on soil of invasion by A. longifolia, and more specifically on soil C and nutrient pools, and microbial processes...

Preliminary analysis of the naturalized flora of northern Africa

Vilà, Montserrat; Meggaro, Youssef; Weber, Ewald
Fonte: Universidade Autônoma de Barcelona Publicador: Universidade Autônoma de Barcelona
Tipo: Article; info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion Formato: application/pdf
Publicado em //1999 ENG
Relevância na Pesquisa
25.71%
There is an urgent need to list regional data on alien species diversity in order to explore worldwide patterns of species invasion. In this sense, developing countries have received little attention. We have characterized the alien flora of northern Africa with regard to the taxonomic composition, life history characteristics, geographic origin and habitats invaded. A total of 343 vascular plant species from 69 families non-native to the regions were found in the literature. Alien species richness ranged from 143 (Algeria) to 60 (Tunisia). Most of these were of Mediterranean and North American origin. Over 40% of the alien species were therophytes. Crop fields, dumps and wet areas such as fresh water streams were the habitats with the higest number of aliens. About 10 % of species in the alien flora are considered to be serious plant invaders in other places of the world. Among these species there are many shrubs and trees such as Acacia and Eucalyptus. The impact of these species must be surveyed in the field.; Per tal d'establir patrons globals d'espècies invasives és necessari i urgent determinar la diversitat de la flora al·lòctona a escala regional. En aquest sentit els països en vies de desenvolupament han rebut poca atenció. Per aquest motiu...

Sobre varias gramíneas alóctonas presentes en la provincia de Valladolid (España)

Lázaro Bello, Jesús Antonio
Fonte: Universidade Autônoma de Barcelona Publicador: Universidade Autônoma de Barcelona
Tipo: Artigo de Revista Científica Formato: application/pdf
Publicado em //2011 SPA
Relevância na Pesquisa
55.92%
Se presentan datos de interés florístico referentes a ocho especies de plantas vasculares alóctonas incluidas en la familia Gramineae Juss. Los taxones citados son: Bromus catharticus Vahl, Cortaderia selloana (Schult. & Schult. f.) Asch. & Graebn., Echinochloa crus-galli (L.) P. Beauv., Eragrostis cilianensis (All.) Janch, Eragrostis virescens C. Presl, Setaria pumila (Poir.) Roem. & Schult., Setaria viridis (L.) P. Beauv. y Sorghum halepense (L.) Pers. Para cada uno de ellos se aporta información corológica, bibliográfica y cartográfica sobre su presencia en la provincia de Valladolid (España). Además, se comparan datos de gramíneas invasoras aparecidos en los principales trabajos florísticos realizados en la provincia; Data of floristic interest concerning eight species of invasive vascular plants, included in the family Gramineae Juss., are provided. The taxa mentioned are: Bromus catharticus Vahl, Cortaderia selloana (Schult. & Schult. f.) Asch. & Graebn., Echinochloa crus-galli (L.) P. Beauv., Eragrostis cilianensis (All.) Janch, Eragrostis virescens C. Presl, Setaria pumila (Poir.) Roem. & Schult., Setaria viridis (L.) P. Beauv. and Sorghum halepense (L.) Pers. For each one of them, chorological, bibliographic and cartographical information on their presence in Valladolid province (Spain) are shown. Moreover...

Escalfament i biologia de la conservació a les Terres Altes de la Guayana: paleoecologia, biogeografia i modelització SIG

Nogué Bosch, Sandra
Fonte: [Barcelona] : Universitat Autònoma de Barcelona, Publicador: [Barcelona] : Universitat Autònoma de Barcelona,
Tipo: Tesis i dissertacions electròniques; info:eu-repo/semantics/doctoralThesis; info:eu-repo/semantics/publishedVersion Formato: application/pdf
Publicado em //2009 CAT
Relevância na Pesquisa
25.99%
Aquesta tesi, usa l'estudi combinat del passat i del present per modelitzar el futur aplicat a les plantes vasculars de les Terres Altes de la Guayana, una remota zona del nord de Sud Amèrica conformada per un conjunt de muntanyes tabulars (conegudes com a tepuis), que presenten un grau d'endemisme excepcional. Aquest alt endemisme ha definit una província biogeogràfica coneguda com a Pantepui. En el capítol 1, mitjançant l'anàlisi de pol·len, espores de falgueres i carbons entre altres, s'han aportat noves dades referents als canvis de la vegetació durant el Tardiglacial i l'Holocè en una localitat situada a 2600 m d'altitud. Els resultats mostren que tot i els canvis detectats en el grau d'humitat, la vegetació es mostra constant durant l'Holocè. Aquesta estabilitat s'explica per una bada, com l'absència de canvis ambientals de suficient intensitat com per afectar a la comunitat de plantes o per l'altre, d'una possible capacitat buffering de la mateixa. Al llarg de la tesi, s'ha analitzat el desplaçament vertical de les plantes vasculars tant en el passat com en el futur. Pel primer cas, el capítol 2 ha aportat dades de les espècies que han pogut migrar durant el Quaternari (70%), així com les que van quedar aïllades (8%) en els cims dels tepuis...

A Contribution to the use, modelling and organization of data in biodiversity conservation

Marcer i Batlle, Arnald
Fonte: [Barcelona] : Universitat Autònoma de Barcelona, Publicador: [Barcelona] : Universitat Autònoma de Barcelona,
Tipo: Tesis i dissertacions electròniques; info:eu-repo/semantics/doctoralThesis Formato: application/pdf
Publicado em //2013 ENG; ENG
Relevância na Pesquisa
25.71%
Aquesta tesi fa una contribució al tractament de les limitacions en les dades de biodiversitat, presències d'espècies, per a produir mapes útils en la conservació de la biodiversitat mitjançant l'ús dels models de distribució d'espècies (SDM). La tesi es concentra en les espècies d'interès per a la conservació (EIC) i les espècies exòtiques invasores (EEI) ja que representen dos objectius complementaris: preservar valors i evitar amenaces. Les àrees protegides són una eina clau en la protecció de la biodiversitat. El seguiment dels canvis en els seus límits és també un repte en la gestió de la informació. Aquesta tesi proposa un sistema d'informació per al seguiment de la protecció de la biodiversitat, lligant així l'anàlisi dels patrons espacials de la mateixa amb la seva protecció. La conservació de la biodiversitat necessita dades de presència d'espècies i eines analítiques per tal de generar coneixement sobre el qual basar polítiques de conservació. La majoria de dades són problemàtiques: escasses, esbiaixades, no extensives, de baixa resolució i amb problemes d'exactitud. Els avenços recents en estadística, informàtica i tecnologies de la informació han posat a disposició dels investigadors un ampli ventall d'eines per afrontar aquest problema; els SDM en són una. Primer s'analitza l'ús dels SDM per a generar mapes de distribució d'EIC quan se'n coneix la seva àrea d'extensió (EOO) i les dades de presència són escasses però de qualitat alta. S'han utilitzat set plantes vasculars endèmiques de l'oest de la Mediterrània com a cas d'estudi. Per tal d'avaluar la conservació i protecció de les espècies es poden utilitzar mapes potencials d'idoneïtat (MPI) en combinació amb l'EOO. En segon lloc...

Plantas vasculares invasoras no Parque Natural da Ilha Terceira : caracterização e monitorização do controlo de Pittosporum undulatum

Goulart, Héber Filipe da Silva
Fonte: Universidade dos Açores Publicador: Universidade dos Açores
Tipo: Dissertação de Mestrado
Publicado em 09/10/2015 POR
Relevância na Pesquisa
66.05%
Dissertação de Mestrado, Engenharia do Ambiente, 9 de Outubro de 2015, Universidade dos Açores.; Na atualidade as plantas vasculares invasoras são uma das mais importantes problemáticas ambientais, principalmente em ilhas oceânicas. Para controlar as espécies vegetais invasoras é necessário, entre outras coisas, (1) conhecer a seu padrão de distribuição bem como (2) o seu comportamento após o ensaio de várias técnicas de erradicação. Neste sentido, o presente trabalho apresenta o resultado de dois estudos, que utilizando metodologias distintas, vão de encontro aos objectivos definidos. [...]. Com o presente estudo pretende-se definir o padrão de distribuição das espécies naturalizadas nas Reservas Naturais do Parque Natural da Ilha Terceira e pretende-se ainda estudar o comportamento destas espécies (principalmente as espécies Pittosporum undulatum, Rubus ulmifolius e Hedychium gardnerianum) após a erradicação da espécie Pittosporum undulatum.; ABSTRACT: Nowadays invasive vascular plants are a major problem, especially on oceanic islands. To control invasive plant species is necessary (1) to know their distribution pattern and (2) their behavior after using eradication techniques. For this purpose, this paper will have two main objetives with distinct methodologies that meet the objetives set. [...]. The present study aims to define the pattern of distribution of invasive species in the Natural Reserves (NR) of Terceira Island Natural Park and still intend to study the behavior of these species (especially Pittosporum undulatum...