Encontrados 33 documentos, a visualizar página 1 de 4
Polar marine biology science in Portugal and Spain: Recent advances and future ...
Xavier, José C.; Barbosa, Andrés; Agustí, Susana; Alonso-Sáez, Laura; Alvito, Pedro; Ameneiro, Julia; Ávila, Conxita; Baeta, Alexandra; Canário, JoãoPolar marine ecosystems have global ecological and economic importance because of their unique biodiversity and their major role in climate processes and commercial fisheries, among others. Portugal and Spain have been highly active in a wide range of disciplines in marine biology of the Antarctic and the Arctic. The main aim of this paper is to provide a synopsis of some of the results and initiatives undertak...
Entangled effects of allelic and clonal (genotypic) richness in the resistance ...
Massa, S. I.; Paulino, Cristina M.; Serrão, Ester; Duarte, C. M.; Arnaud-Haond, S.Background - The relationship between species diversity and components of ecosystem stability has been extensively studied, whilst the influence of the genetic component of biodiversity remains poorly understood. Here we manipulated both genotypic and allelic richness of the seagrass Zostera noltii, in order to explore their respective influences on the resistance of the experimental population to stress. Thus ...
Invasion is a community affair: clandestine followers in the bacterial communit...
Aires, T.; Serrão, Ester; Kendrick, G.; Duarte, C. M.; Arnaud-Haond, S.Biological invasions rank amongst the most deleterious components of global change inducing alterations from genes to ecosystems. The genetic characteristics of introduced pools of individuals greatly influence the capacity of introduced species to establish and expand. The recently demonstrated heritability of microbial communities associated to individual genotypes of primary producers makes them a potentiall...
The rediscovery of Caulerpa prolifera in Ria Formosa, Portugal, 60 years after ...
Cunha, A. H.; Varela-¿?lvarez, E.; Paulo, D. S.; Sousa, I.; Serrão, EsterThe westernmost occurrence of Caulerpa prolifera on the Atlantic European coast has been accepted in recent decades, to be Huelva province, southern Spain. In April 2011, this species was found in Ria Formosa, southern Portugal, extending its westernmost limit along the Iberian Peninsula coastline. In the course of research into this species it was discovered that this alga had been found in Ria Formosa in the ...
Genetic flow directionality and geographical segregation in a Cymodocea nodosa...
Masucci, A. P.; Arnaud-Haond, S.; Eguíluz, V. M.; Hernández-García, E.; Serrão, EsterWe analyse a large data set of genetic markers obtained from populations of Cymodocea nodosa, a marine plant occurring from the East Mediterranean to the Iberian-African coasts in the Atlantic Ocean. We fully develop and test a recently introduced methodology to infer the directionality of gene flow based on the concept of geographical segregation. Using the Jensen-Shannon divergence, we are able to extract a d...
First record of the brown mussel (Perna perna) from the European Atlantic coast
Lourenço, C. R.; Nicastro, K. R.; Serrão, Ester; Zardi, G. I.The occurrence of the brown mussel Perna perna is reported for the first time from the European Atlantic coast, on the southern Portuguese coast. Several specimens of this mytilidae species were identified in exposed rocky intertidal habitats in Vilamoura (37804019.7000N 8807019.7100W) and Ilha do Farol (36858029.3800N 7851042.5100W). It is suggested that, under warming climate conditions, this subtropical/trop...
Implications of extreme life span in clonal organisms: millenary clones in mead...
Arnaud-Haond, S.; Duarte, C. M.; Diaz-Almela, E.; Marbà, N.; Sintes, T.; Serrão, EsterThe maximum size and age that clonal organisms can reach remains poorly known, although we do know that the largest natural clones can extend over hundreds or thousands of metres and potentially live for centuries. We made a review of findings to date, which reveal that the maximum clone age and size estimates reported in the literature are typically limited by the scale of sampling, and may grossly underestima...
Love thy neighbour: group properties of gaping behaviour in mussel aggregations
Nicastro, K. R.; Zardi, G. I.; McQuaid, C. D.; Pearson, G. A.; Serrão, EsterBy associating closely with others to form a group, an animal can benefit from a number of advantages including reduced risk of predation, amelioration of environmental conditions, and increased reproductive success, but at the price of reduced resources. Although made up of individual members, an aggregation often displays novel effects that do not manifest at the level of the individual organism. Here we show...
Mediterranean Species of Caulerpa Are Polyploid with Smaller Genomes in the Inv...
Varela-Alvarez, E.; Gómez Garreta, A.; Rull Lluch, J.; Salvador Soler, N.; Serrão, Ester; Siguán, M. A. R.Caulerpa species are marine green algae, which often act as invasive species with rapid clonal proliferation when growing outside their native biogeographical borders. Despite many publications on the genetics and ecology of Caulerpa species, their life history and ploidy levels are still to be resolved and are the subject of large controversy. While some authors claimed that the thallus found in nature has a h...
Panmixia in a fragmented and unstable environment: the hydrothermal shrimp Rimi...
Teixeira, S.; Serrão, Ester; Arnaud-Haond, S.Dispersal plays a fundamental role in the evolution and persistence of species, and especially for species inhabiting extreme, ephemeral and highly fragmented habitats as hydrothermal vents. The Mid-Atlantic Ridge endemic shrimp species Rimicaris exoculata was studied using microsatellite markers to infer connectivity along the 7100-Km range encompassing the sampled sites. Astonishingly, no genetic differentiat...
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