Encontrados 16 documentos, a visualizar página 1 de 2
Endozoochory largely outweighs epizoochory in migrating passerines
Costa, Jose M.; Ramos, Jaime A.; da Silva, Luís P.; Timoteo, Sergio; Araujo, Pedro M.; Felgueiras, Marsial S.; Rosa, Antonio; Matos, ClaudiaFruits and seeds are critical food sources for many European passerines during the autumn migration, which in turn contribute to disperse seeds either internally, i.e. after ingestion (endozoochory), or externally, when seeds adhere to the body surface (epizoochory). Despite the recognized importance of birds as seed dispersers, the vast majority of studies focused on endozoochory while the external transport o...
Assessing the role of body mass and sex on apparent adult survival in polygynou...
Monticelli, David; Araujo, Pedro M.; Hines, James E.; Tenreiro, Paulo Q.; Silva, Luis P.; Ramos, Jaime A.Adult survival, an important fi tness component, is usually 1) lower in lighter individuals due to their reduced ability to survive winter conditions compared to heavier ones, especially in resident species at northern temperate latitudes and 2) lower in females compared with males due to higher reproductive costs incurred by females. In this paper, a capture – mark – recapture dataset of 649 cetti ’ s warblers...
Mosquito species distribution in mainland Portugal 2005-2008
Osório, Hugo C.; Amaro, Fátima; Zé-Zé, Líbia; Pardal, Sara; Mendes, Luísa; Ventim, Rita; Ramos, Jaime A.; Nunes, Sofia; REVIVE workgroupInformation on distribution and relative abundance of the mosquito fauna of mainland Portugal has been collected by several surveillance programmes and projects over a long period. The work presented here documents additional information provided by capture of adult mosquitoes by the use of CDC light traps baited with CO2 in 48 localities in 13 districts in different parts of mainland Portugal during the period...
Comparative foraging ecology of a tropical seabird community of the Seychelles,...
Catry, Teresa; Ramos, Jaime A.; Jaquemet, Sébastien; Faulquier, Lucie; Berlincourt, Maud; Hauselmann, Antoine; Pinet, Patrick; Le Corre, MatthieuWe studied the foraging ecology of a tropical seabird community in 2 islands of the Seychelles from 2005 to 2007. Chick dietary samples were used to compare feeding habits among species and assess inter-annual and seasonal variations in diet. Fish prey dominated the diet of the community (68 to 100% of prey consumed), although cephalopods were present in 61.3, 40.0, 27.1 and 32.9% of the food samples from white...
Foraging habitat selection by Little Terns Sternula albifrons in an estuarine l...
Paiva, Vitor H.; Ramos, Jaime A.; Martins, Jorge; Almeida, Ana; Carvalho, AnaWe assessed the effects of environmental variables on the distribution and feeding behaviour of adult Little Terns Sternula albifrons in Ria Formosa Natural Park, Algarve, southern Portugal, in different foraging habitats (main lagoon, salinas and sea) during the breeding seasons, April2013July, of 2003201305. Foraging density was higher in the lagoon than in the sea, and at low tide. The number of foraging ind...
The Influence of Diet on Mercury Intake by Little Tern Chicks
Paiva, Vitor H.; Tavares, Paula C.; Ramos, Jaime A.; Pereira, Eduarda; Antunes, Sandra; Duarte, Armando C.We assessed mercury levels in the feathers of little tern (Sternula albifrons) chicks from hatching to fledging and in their prey captured by adults in three main foraging habitats: lagoon, salinas, and adjacent sea. These data were used to model mercury concentration in chick feathers through food ingestion, in order to explore the effects that changes in diet would have on the mercury burden of chicks as they...
Subtropical Roseate Terns (Sterna dougallii) of Santa Maria (Azores) deliver mo...
Pereira, José C.; Ramos, Jaime A.We compared chick food provisioning between Roseate Tern (Sterna dougallii) and Common Tern (Sterna hirundo) on Vila, an islet offshore Santa Maria Island (36.9ºN, 25ºW), Azores in 1996. Twelve nests of each species were fenced and prey deliveries to chicks of both species were observed during three diurnal periods each day for 35 days. We identified all prey offered to chicks, registered whether chicks ingeste...
Selection of trees for rubbing by red and roe deer in forest plantations
Ramos, Jaime A.; Bugalho, Miguel N.; Cortez, Paulo; Iason, Glenn R.Antler rubbing is a form of behaviour by which deer may damage and ultimately induce mortality of trees. Understanding factors affecting selection of trees for rubbing may contribute to mitigation of negative effects of such behaviour in plantations or woodlands. We analysed characteristics of trees rubbed by red and roe deer along transects established in plantations of Pinus pinaster (Aiton), Pseudotsuga menz...
A importância da Ria de Aveiro para a população reprodutora de Garça-vermelha "...
Marques, Sérgio; Ramos, Jaime A.A Garça-vermelha Ardea purpurea é uma espécie com estatuto de conservação Em Declínio a nível europeu e Em Perigo em Portugal. Neste estudo efectuamos uma revisão bibliográfica sobre a ocorrência da Garça-vermelha em Portugal, e actualizamos o conhecimento da distribuição e estimativas populacionais desta espécie na Ria de Aveiro. A Garça-vermelha terá sido uma ave comum em Portugal pelo menos desde a segunda m...
Importance of marine prey to growth of estuarine tern chicks: evidence from an ...
Paiva, Vitor H.; Ramos, Jaime A.; Machado, Daniel; Penha-Lopes, Gil; Bouslama, Mohamed Fadhel; Dias, Nuno; Nielsen, SørenWe assessed the effects of quality and quantity of prey species on the growth of Little Tern Sterna albifrons chicks raised in salinas (salt-pans), Algarve, Portugal. An energetic balance model was developed, which estimated the total amount of energy ingested by all chicks in a nest and the energy expenditure by the chicks when either growing alone or in groups of two and three per nest. Energy intake per chic...
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