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The strange case of the tetragenous Anodonta anatina
Lima, Manuel Lopes; Hinzmann, Mariana; Teixeira, Amílcar; Varandas, Simone; Machado, Jorge; Sousa, Ronaldo Gomes; Froufe, ElsaUnionoid freshwater mussels have a unique life cycle with a form of parental care where the larvae are developed and kept inside the gills until release, followed by an obligate parasitic stage on fish. The size and location of the marsupium have been used as important phylogenetic characters in unionoids and in Anodontini its location was described exclusively on the outer demibranchs. Two recent surveys in a ...
The strange case of the tetragenous Anodonta anatina
Lopes-Lima, Manuel; Hinzmann, Mariana; Teixeira, Amílcar; Varandas, Simone; Machado, Jorge; Sousa, Ronaldo; Froufe, ElsaUnionoid freshwater mussels have a unique life cycle with a form of parental care where the larvae are developed and kept inside the gills until release, followed by an obligate parasitic stage on fish. The size and location of the marsupium have been used as important phylogenetic characters in unionoids and in Anodontini its location was described exclusively on the outer demibranchs. Two recent surveys in a ...
Ecology of southern European pearl mussels (Margaritifera margaritifera): first...
Varandas, Simone; Lima, Manuel Lopes; Teixeira, Amílcar; Hinzmann, Mariana; Reis, Joaquim; Cortes, Rui; Machado, Jorge; Sousa, Ronaldo Gomes1. Southern European populations of Margaritifera margaritifera (L., 1758) are under-studied. From 1986 to 2001 this species was considered extinct in Portugal but between 2001 and 2002 six northern populations were found, five of which were previously unknown. 2. This study comprises a comparative study of the ecology and habitat requirements of two new populations in the rivers Beça and Terva (tributaries of ...
Reproductive cycle and strategy of Anodonta anatina (L., 1758): notes on hermap...
Hinzmann, Mariana; Lima, Manuel Lopes; Teixeira, Amílcar; Varandas, Simone; Sousa, Ronaldo Gomes; Lopes, Anabela; Froufe, Elsa; Machado, JorgeFreshwater mussels have decreased dramatically in Iberia over the last decades. These animals are responsible for important ecosystem services such as recycling nutrients and improving water clarity. Under this view a better knowledge on the biological features of these animals is extremely important for future conservation and management actions. In this study the reproductive and gametogenic cycle of Anodonta...
Biotic homogenization as a threat to native affiliate species: fish introductio...
Douda, Karel; Lima, Manuel Lopes; Hinzmann, Mariana; Machado, Jorge; Varandas, Simone; Teixeira, Amílcar; Sousa, Ronaldo GomesAim The indirect consequences of biotic homogenization, the process of a gradual increase in the similarity of regional biotas driven by the combined effects of species invasions and extinctions, are still poorly understood. In this study, we aimed to assess the ability of a native affiliate species to maintain its host resources under the condition of biotic homogenization of host communities. Location Central...
Biotic homogenization as a threat to native affiliate species: fish introductio...
Douda, Karel; Lopes-Lima, Manuel; Hinzmann, Mariana; Machado, Jorge; Varandas, Simone; Teixeira, Amílcar; Ronaldo, SousaAim: The indirect consequences of biotic homogenization, the process of a gradual increase in the similarity of regional biotas driven by the combined effects of species invasions and extinctions, are still poorly understood. In this study, we aimed to assess the ability of a native affiliate species to maintain its host resources under the condition of biotic homogenization of host communities. Location: Centr...
Modulation of poly-N-acetylglucosamine accumulation within mature Staphylococcu...
Cerca, Filipe; França, Ângela; Guimarães, Rodrigo; Hinzmann, Mariana; Cerca, Nuno; Cunha, Alexandre Lobo da; Azeredo, Joana; Vilanova, ManuelPNAG is a major component of Staphylococcus epidermidis biofilms involved in intercellular adhesion as well as in the interaction of the biofilm with components of the host immune response. Synthesis of PNAG has been found to be regulated by several environmental factors. In the present study, the effect of glucose metabolism-dependent culture medium acidification in PNAG accumulation was evaluated. Established...
Caracterização ecológica das populações de mexilhão-de-rio (Margaritifera marga...
Nogueira, Mónica Sofia Reis; Teixeira, Amílcar; Varandas, Simone; Lopes-Lima, Manuel; Hinzmann, Mariana; Machado, Jorge; Cortes, Rui M.V.Este estudo pretende caracterizar as condições ecológicas das populações de mexilhão-de-rio (Margaritifera margaritifera L.) e truta-de-rio (Salmo trutta L.) na bacia hidrográfica do rio Tua, nomeadamente nos rios Rabaçal e Tuela. A degradação ambiental (e.g. regularização, poluição) é um factor de regressão associado ao decréscimo da espécie M. margaritifera em Portugal que justifica a monitorização e avaliaçã...
Estudos preliminares de populações de mexilhão-de-rio (Margaritifera margaritif...
Teixeira, Amílcar; Lima, Manuel; Machado, Jorge; Hinzmann, Mariana; Cortes, Rui M.V.; Varandas, Simone; Antunes, FilipaPermanecem pouco estudadas as condições ecológicas dos rios Rabaçal e Tuela que permitem a existência de populações viáveis de mexilhão-de-rio (Margaritifera margaritifera L.). Estudos preliminares realizados no Verão de 2009 permitiram caracterizar o habitat e microhabitat usado pela espécie assim como a qualidade da água e sedimentos. Relativamente ao habitat foi aplicada a metodologia RHS (River Habitat Surv...
Extracellular matrix in Staphylococcus epidermidis biofilms: a consequence of b...
Cerca, Filipe; Andrade, Filipa; Correia, Alexandra; Teixeira, Luzia; Magalhães, Ângela; Hinzmann, Mariana; Ferreira, Íris; Ribeiro, AdíliaStaphylococcus epidermidis is a leading pathogen accounting for nosocomial infections. The ability to form biofilms is considered the major virulence factor of this bacterium. The hallmark of this type of infection is the presence of an extracellular polymeric matrix that, in the case of S. epidermidis biofilms, is mainly constituted by an N-acetylglucosamine polymer. We have identified a subpopulation of bacte...