Encontrados 72 documentos, a visualizar página 1 de 8
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 ...
Feeding ecology of the Ruivaco Achondrostoma oligolepis, a portuguese endemic c...
Santos, José M.; Encina, Lourdes; Oliveira, João; Teixeira, AmílcarThis study assessed the feeding ecology of the ruivaco Achondrostoma oligolepis, a Portuguese endemic resident cyprinid fish whose dietary habits are virtually unknown. Samples were taken seasonally in three medium-sized rivers representing a gradient of temporality. The stomach contents of 97 individuals (42-126 mm total length, TL) were analysed. Although there was no significant overall variation in diet com...
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...
Large spill of mining wastes in Portelo stream: impacts on ecosystem integrity ...
Geraldes, Ana Maria; Ramalhosa, Elsa; Caetano, Miguel; Teixeira, AmílcarStreams located at Montesinho Natural Park (NE Portugal) have high potential for brown trout (Salmo trutta) angling. However, in this territory there are several abandoned mine sites. Therefore, the continuous drainage of fine grained tailings can be particularly problematic due to arsenic, copper, aluminium and zinc. However, until now no significant disturbance was detected in water quality and in biota. Neve...
Dispersão dos lagostins exóticos Procambarus clarkii e Pacifastacus leniusculus...
Geraldes, Ana Maria; Teixeira, AmílcarForam estudados os efeitos ambientais nos ecossistemas aquáticos resultantes do colapso das escombreiras das minas do Portelo, situadas na área protegida do Parque Natural de Montesinho, no Nordeste de Portugal. Este acidente ocorrido nos últimos dias de Dezembro de 2009, depois de um período prolongado de chuvas intensas, levou ao arrastamento de um volume assinalável de sedimentos, acumulados na proximidade d...
Impactos da sedimentação em cursos de água do Parque Natural de Montesinho (NE ...
Teixeira, Amílcar; Geraldes, Ana MariaForam estudados os efeitos ambientais nos ecossistemas aquáticos resultantes do colapso das escombreiras das minas do Portelo, situadas na área protegida do Parque Natural de Montesinho, no Nordeste de Portugal. Este acidente ocorrido nos últimos dias de Dezembro de 2009, depois de um período prolongado de chuvas intensas, levou ao arrastamento de um volume assinalável de sedimentos, acumulados na proximidade d...
Que nos dizem as comunidades de macroinvertebrados acerca dos impactos do colap...
Geraldes, Ana Maria; Teixeira, AmílcarEm Janeiro de 2010 em consequência de um evento de precipitação extrema uma grande parte dos materiais armazenados nas escombreiras das minas do Portelo foi arrastada para os cursos de ágLia circundantes. Com o objetivo de avaliar as consequências deste evento na integridade ecológica dos cursos de água adjacentes foram amostradas as comunidades de macroinvertebrados aquáticos em vários pontos. Os resultados in...
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