Search results for "colonisation"
showing 10 items of 87 documents
Colonisation process of vegetative fragments of Posidonia oceanica (L.) Delile on rubble mounds
2005
Seagrass colonise new areas via the dispersion of seeds or vegetative fragments. Independent of the manner of colonization, habitat requirements need to be met for the successful establishment of seagrasses. Here we report on the colonization process of Posidonia oceanica in a highly disturbed area: a gas pipeline trench at Capo Feto (SW Sicily, Italy). A trench dredged through a P. oceanica bed was back-filled with rubble added from dump barges leading to the formation of a series of rubble mounds on the seabed. Over time, these mounds became colonised with P. oceanica. In order to understand the pattern of P. oceanica colonization, shoot density was quantified over 3 years (2001-2003) on …
Grèce : un monde de migrants
2015
International audience; Le monde grec, pas plus que le nôtre, ne fut un monde stable. La mythologie comme l'archéologie attestent de mouvements de populations en tous sens autour de la Méditerranée et de la mer Noire. Colons à la recherche de terre, exilés politiques, réfugiés économiques, aventuriers : le monde grec est un monde de migrants qui, libres ou contraints, se sont déplacés tout autour de la Méditerranée. La figure du migrant tient une place de choix dans la mythologie. Avant de se faire reconnaître comme un dieu et de recevoir un culte, Dionysos emprunte toujours le costume du migrant. Dans Les Bacchantes d'Euripide, lorsqu'il arrive à Thèbes, il n'est pour Penthée, le maître de…
Fungi and Bacteria in Indoor Cultural Heritage Environments: Microbial-related Risks for Artworks and Human Health
2016
Cultural heritage constitutive materials can provide excellent substrates for microbial colonization, highly influenced by thermo-hygrometric parameters. In cultural heritage-related environments, a detrimental microbial load may be present both on manufacts surface and in the aerosol. In this study, bacterial and fungal colonisation has been investigated in three Sicilian confined environments (archive, cave and hypogea), each with peculiar structures and different thermo-hygrometric parameters. Particular attention has been paid to microorganisms able to induce artifacts biodeterioration and to release biological particles in the aerosol (spores, cellular debrides, toxins and allergens) p…
Nested assemblages resulting from host size variation: the case of endoparasite communities in fish hosts
2001
Nested species subsets are a common pattern in many types of communities found in insular or fragmented habitats. Nestedness occurs in some communities of ectoparasites of fish, as does the exact opposite departure from random assembly, anti-nestedness. Here, we looked for nested and anti-nested patterns in the species composition of communities of internal parasites of 23 fish populations from two localities in Finland. We also compared various community parameters of nested and anti-nested assemblages of parasites, and determined whether nestedness may result simply from a size-related accumulation of parasite species by feeding fish hosts. Nested parasite communities were characterised b…
Malaria en España: aspectos entomológicos y perspectivas de futuro
2008
Rubén Bueno Marí (ruben.bueno@uv.es) y Ricardo Jiménez Peydró (Ricardo.Jimenez@uv.es) La malaria fue erradicada de España oficialmente en 1964. Sin embargo, en la actualidad en nuestro país se registran anualmente cientos de casos importados. En este sentido, el estudio del vector se postula de gran importancia para inferir posibles escenarios de transmisión, ya sea de tipo esporádico o regular. Si bien el nivel socio-económico del país no parece secundar una posible reemergencia de la enfermedad a corto o medio plazo, la presencia de poblaciones de anofelinos bien establecidas y gametocitos de plasmodios circulando entre cierto porcentaje de la población humana parecen avalar, con suficien…
Leaps and bounds: geographical and ecological distance constrained the colonisation of the Afrotemperate by Erica.
2018
Abstract Background The coincidence of long distance dispersal (LDD) and biome shift is assumed to be the result of a multifaceted interplay between geographical distance and ecological suitability of source and sink areas. Here, we test the influence of these factors on the dispersal history of the flowering plant genus Erica (Ericaceae) across the Afrotemperate. We quantify similarity of Erica climate niches per biogeographic area using direct observations of species, and test various colonisation scenarios while estimating ancestral areas for the Erica clade using parametric biogeographic model testing. Results We infer that the overall dispersal history of Erica across the Afrotemperate…
Farmland versus forest: comparing changes in Odonata species composition in western and eastern Sweden
2013
Despite the loss of natural ecosystems in the developed world dur- ing the past millennia, anthropogenic landscapes still sustain much biodiversity. Our question was, whether ten year changes in regional Odonata faunas are comparable between farmland and forested areas, or if the species pool of farm- land areas respond in other ways than that of forest. 2. We used data of dragonfly larvae collected from 16 lakes in a farmland area in south-western Sweden in the years 2002 and 2011/12, and compared these to data from 34 lakes in a forest area in south-eastern Sweden in the years 1996 and 2006. 3. The species-richness in the agricultural region increased by 17% but decreased by 13% in the fo…
The coffee-machine bacteriome: biodiversity and colonisation of the wasted coffee tray leach
2015
AbstractMicrobial communities are ubiquitous in both natural and artificial environments. However, microbial diversity is usually reduced under strong selection pressures, such as those present in habitats rich in recalcitrant or toxic compounds displaying antimicrobial properties. Caffeine is a natural alkaloid present in coffee, tea and soft drinks with well-known antibacterial properties. Here we present the first systematic analysis of coffee machine-associated bacteria. We sampled the coffee waste reservoir of ten different Nespresso machines and conducted a dynamic monitoring of the colonization process in a new machine. Our results reveal the existence of a varied bacterial community…
Founder population size and number of source populations enhance colonization success in waterstriders.
2002
Understanding the factors that underlie colonization success is crucial both for ecological theory and conservation practices. The most effective way to assess colonization ability is to introduce experimentally different sets of individuals in empty patches of suitable habitat and to monitor the outcome. We translocated mated female waterstriders, Aquarius najas, into 90 streams that were not currently inhabited by the species. We manipulated sizes of propagules (from 2 to 16 mated females) and numbers of origin populations (one or two). Three origin populations were genetically different from each other, but they were less than 150 km from the streams of translocation. The results demonst…
Colonización territorial, razón ilustrada y particularidades valencianas en la nueva población de Benadressa (Castelló de la Plana)
2008
El presente artículo analiza la proyección de una nueva población en el interior de la Plana de Castelló (N. del País Valenciano), un proceso de colonización territorial realizado al amparo de la reposición del denominado Fuero o Privilegio Alfonsino (segunda mitad del s.XVIII). El ejemplo de Benadressa permite comprender las complejas relaciones de poder e ideología que se dieron en este tipo de planes, de iniciativa privada pero insertados plenamente en el proyecto económico y territorial de la Ilustración. A su vez, se trata de un capítulo más de las profundas transformaciones sufridas por la Plana de Castelló en la Edad Moderna, principalmente basadas en el avance de la superficie culti…