Encontrados 13 documentos, a visualizar página 1 de 2
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: Cent...
Ecology of southern European pearl mussels (Margaritifera margaritifera): first...
Varandas, Simone; Lopes-Lima, Manuel; Teixeira, Amílcar; Hinzmann, Mariana; Reis, Joaquim; Cortes, R.; Machado, Jorge; Sousa, Ronaldo1. 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 ...
Development and multiplexing of microsatellite loci for the near threatened fre...
Froufe, Elsa; Sobral, Carina; Teixeira, Amílcar; Lopes, Anabela; Sousa, Ronaldo; Varandas, Simone; Lopes-Lima, Manuel1. The Unionidae are among the most endangered fauna in the world and globally in decline. They are particularly vulnerable to habitat loss and fragmentation, susceptible to flow, pollution and climatic disturbances and introduction of invasive species. Despite their well-recognized ecological and conservation importance, there is a surprising lack of genomic resources currently available for European species. ...
Reproductive cycle and strategy of Anodonta anatina (L., 1758): Notes on hermap...
Hinzmann, Mariana; Lopes-Lima, Manuel; Teixeira, Amílcar; Varandas, Simone; Sousa, Ronaldo; 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...
Ecological status of a Margaritifera margaritifera (Linnaeus, 1758) population ...
Sousa, Ronaldo; Amorim, Angela; Sobral, Carina; Froufe, Elsa; Varandas, Simone; Teixeira, Amílcar; Lopes-Lima, ManuelAn important population of the critically endangered pearl mussel Margaritifera margaritifera (Linnaeus, 1758) was surveyed at the edge of its southern distribution (River Paiva, Portugal). Although an earlier study suggested that this population had a very low number of individuals (<500), a narrow distribution, and was mainly comprised by old specimens our data contradict these findings. Our assessment estima...
Bioecologia dos mexilhões de água doce (Unionidae) nos rios Sabor, Tua e Tâmega...
Teixeira, Amílcar; Varandas, Simone; Sousa, Ronaldo; Froufe, Elsa; Lopes-Lima, ManuelForam avaliadas as condições ambientais das populações de náiades (Mollusca, Bivalvia, Unionidae) em diferentes troços dos rios Tâmega, Tua e Sabor, na proximidade de grandes empreendimentos hidroelétricos em fase de construção. No verão dos anos 2010, 2011 e 2012 foi caracterizado o habitat e microhabitat disponível e usado pelas espécies Unio delphinus, Anodonta anatina e Potomida littoralis. Recorreu-se à me...
Ionic regulation and shell mineralization in the bivalve Anodonta cygnea follow...
Lopes-Lima, Manuel; Freitas, Susana; Pereira, Liliana; Gouveia, Eugénia; Hinzmann, M.; Checa, Antonio; Machado, JorgeFreshwater mussels are one of the most imperiled faunistic groups in the world and environmental exposure to toxic heavy metals, which result in deregulation of calcium absorption and deposition in the laboratory, may be a contributing factor in their decline. To address potential effects of heavy-metal exposure on calcium transport and metabolism in freshwater bivalves, adult Anodonta cygnea (L., 1758) were ex...
Massive die-offs of freshwater bivalves as resource pulses
Sousa, Ronaldo; Varandas, S.; Cortes, R.; Teixeira, Amílcar; Lopes-Lima, Manuel; Machado, Jorge; Guilhermino, LúciaThe winter of 2009/2010 was particularly severe in Northern Portugal resulting in higher river flow levels. A study was undertaken to assess the impact of this situation on several populations of freshwater bivalves (e.g., Anodonta anatina, Corbicula fluminea, Margaritifera margaritifera, Potomida littoralis and Unio delphinus) in the catchments of the Rivers Minho, Douro, Taˆ mega, Tua and Sabor. Massive die-o...
Phytoplankton survey of “Barrinha”lagoon (Mira – Portugal)
Hinzmann, M.; Varandas, S.; Teixeira, Amílcar; Lopes-Lima, Manuel; Machado, JorgeThis work reports a one year survey (October 2008 to October 2009) where limnology and plankton data from Barrinha lagoon (Mira-Portugal - 40° 27′ 22″ N, 8° 48′ 7″ W) were analyzed. This lagoon shows peculiar geochemical features being one of the few places in Portugal where the freshwater bivalve Anodonta cygnea can be found. This study consisted on monthly collections of water samples, with identification an...
Distribuição espacial dos bivalves de água doce nas bacias hidrográficas dos ri...
Varandas, S.; Teixeira, Amílcar; Lopes-Lima, Manuel; Sobral, Carina; Cortes, R.; Machado, JorgeEste trabalho teve por objectivo fazer um levantamento dos bivalves de água doce das bacias dos rios Tâmega, Tua e Sabor e encorajar a conservação das espécies autóctones e dos ecossistemas onde ocorrem. De referir que estas populações nativas são muito sensíveis a modificações súbitas e bruscas do habitat como secas, construção de barragens com consequentes descargas tóxicas, sobre-exploração dos recursos hídr...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||