Encontrados 23 documentos, a visualizar página 1 de 3
Tawny owl vocal activity is constrained by predation risk
Lourenço, Rui; Goytre, Fernando; Delgado, Maria del Mar; Thornton, Michael; Rabaça, João E.; Penteriani, VincenzoThe vocal behaviour of birds may be influenced by many factors, including the risk of being detected by a predator. In Doñana Protected Area, the tawny owl co-exists alongside its intraguild predator, the eagle owl Bubo bubo . We considered four scenarios to study the vocal behaviour of tawny owls at dusk by analysing: A) the calling rate of all males in 29 sites; B) the calling rate at dusk of males living wit...
Can birds enhance the dispersal of freshwater macrocrustaceans?
Anastácio, Pedro M.; Banha, Filipe; Rachalewski, Michal; Ferreira, Miriam; Capinha, César; Rabaça, João E.; Grabowski, MichalThe freshwater crustaceans, Crangonyx pseudogracilis, Atyaephyra desmaresti and Procambarus clarkii (hereby referred to as FCs) are non-native in several areas of their distribution range presumably due to human-mediated introductions. Here we test dispersal by waterbirds as a complementary mechanism of dispersal of these 3 species. For P. clarkii, we studied the transport of recently hatched juveniles while, f...
Key factors for nature value in Montados
Godinho, Carlos; Rabaça, João E.Montados are parkland forested areas of anthropogenic origin dominated by cork oak (Quercus suber) and/or holm oak (Q. rotundifolia). They are derived from natural Mediterranean forests, where the use of woodland products (timber, charcoal and cork) is combine with cereal crops and livestock grazing in the understory (Blondel and Aronson 1999). These use resulted in a singular “savanna” like land cover pattern ...
Aromatic Plants in Eurasian Blue Tit Nests: The ‘Nest
Pires, Bárbara A.; Belo, Anabela F.; Rabaça, João E.The ‘Nest Protection Hypothesis’ suggests that some birds add aromatic plants to their nests to repel or kill ectoparasites. This behavior has been described for several species, including the Eurasian Blue Tit (Cyanistes caeruleus). We studied the reproductive performance, based on 26 nests (in nest boxes), of this species in mixed forested areas of Quercus spp. and Pinus pinea in the Parque Florestal de Monsa...
Linking plant composition and arthropod abundance to establish little bustard b...
Faria, Nuno; Rabaça, João E.; Morales, Manuel B.Most research on steppe bird habitat selection has been focused on the effects of management regimes or vegetation structure. However, much less is known on how plant composition is related with steppe bird occurrence. We investigated microhabitat of little bustard territorial males and females during the nesting and chick-rearing season in areas with dominance of pastureland focusing on plant composition. We s...
The importance of grazing regime in the provision of breeding habitat for grass...
Faria, Nuno; Rabaça, João E.; Morales, Manuel B.In Mediterranean dry grasslands, grazing by domestic animals is an important agricultural activity on dry grasslands. Several bird species occur in these grazed habitats and are now experiencing a near continuous decline. We investigated the impact of livestock grazing on the threatened little bustard (Tetrax tetrax L.). The study was conducted at the NATURA 2000 Site/Important Bird Area of Cabrela, Portugal. O...
Conservation of Steppe Birds at Fine Scale: Does Plant Composition Matters for ...
Faria, Nuno; Rabaça, João E.; Morales, Manuel B.We investigated microhabitat of little bustard territorial males and females during the nesting and chick-rearing season focusing on plant composition. We searched for relationships between preferred vegetation and arthropod abundance in order to identify the contribution of different vegetation typologies in providing essential trophic resources for the species.
Major Roads Have a Negative Impact on the Tawny Owl Strix aluco and the Little ...
Silva, Clara C.; Lourenço, Rui; Godinho, Sérgio; Gomes, Edgar; Sabino-Marques, Helena; Medinas, Denis; Neves, Vânia; Silva, Carmo; Rabaça, João E.The increasing road networks threaten ecosystems by direct effects such as increased mortality due to collision with vehicles and by various indirect effects leading to road avoidance. We censused Tawny Owls Strix aluco and Little Owls Athene noctua in 2005, 2007 and 2009 in a rural landscape in Southern Portugal in order to study the effects of roads and habitat characteristics on Tawny Owl density and Little ...
O papel dos aterros sanitários na dieta da Cegonha-branca Ciconia ciconia. O At...
Ventura, Tiago; Faria, Nuno; Roque, Inês; Silva, Patrícia; Rabaça, João E.A população de cegonha-branca Ciconia ciconia da Europa Ocidental sofreu uma diminuição ao longo do século XX, mas esta situação inverteu-se nas últimas duas décadas. Segundo alguns autores, a presença das lixeiras e aterros sanitários poderá ser uma das principais razões desta recuperação. Deste modo, este trabalho tem como principais objectivos (1) descrever a dieta da cegonha-branca que habitam na região de ...
O cleptoparasitismo na dieta da Cegonha-branca
Ventura, Tiago; Faria, Nuno; Rabaça, João E.Nos dias de hoje facilmente detectamos a presença de espécies de aves que aproveitam a disponibilidade trófica presente nas lixeiras e aterros sanitários, sendo a cegonha-branca Ciconia ciconia um dos exemplos mais comuns deste comportamento. As duas espécies de milhafre que ocorrem na região de Évora, em Portugal, o milhafre-real Milvus milvus e o milhafre-preto Milvus migrans costumam apresentar um comportame...
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