9 documents found, page 1 of 1
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...
Continuidade fluvial em mini-hídricas - o caso da Ribeira de Santa Natália
Santos, Cátia; Varandas, Simone; Lopes, Marisa; Pereira, Vitor; Santos, Pedro; Teixeira, AmílcarAs centrais Mini-Hídricas são aproveitamentos hidroelétricos com potências instaladas inferiores a 10 MVA. Regra geral, estas centrais são a fio de fio-de-água, ou seja, havendo armazenamento de água este será em pequena quantidade, minimizando os impactos ambientais em relação a uma central de albufeira. No entanto, os açudes característicos das mini-hídricas podem impedir a passagem de peixes, isolando as pop...
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...
Leaf litter decomposition in western iberian forested wetlands: lentic versus l...
Sampaio, Ana; Rodriguez-Gonzalez, Patricia; Varandas, Simone; Cortes, Rui Manuel; Ferreira, Maria TeresaLeaf litter breakdown is frequently used to measure both structural and functional integrity in aquatic ecosystems. Forested wetlands are interface systems that received little attention, especially in the Iberian Peninsula. The present study compares the decomposition of alder and willow in two biotopes (lentic and lotic) located in two different sites (Caxarias and Alpiarc¸a). Litterbags were used to compare ...
Combining habitat and biological characterization: ecological validation of the...
Cortes, Rui Manuel; Varandas, Simone; Hughes, Samantha Jane; Ferreira, Maria TeresaThe River Habitat Survey (RHS) is a widespread technique used to characterize the habitats at the fluvial sector level and to quantify the magnitude of physical disturbances. In this study we tested the ability of this method to discriminate sites along a gradient of perturbation and to analyse its relation with typological and environmental features. At the same time, a biological validation of RHS parameters ...
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