17 documents found, page 1 of 2
Dynamics and effects of plastic contaminants’ assimilation in gulls
Veríssimo, S. N.; Cunha, S. C.; Fernandes, J. O.; Casero, M.; Vieira, M. T.; Ramos, J. A.; Norte, A. C.; Paiva, V. H.Background: Opportunistic animals such as gulls are often associated with anthropogenic activities [1,2], and therefore highly susceptible to plastic ingestion and stomach chemical leaching [3]. Yet, such chemical process is still poorly studied and there is almost no information regarding potential hazardous effects in animal physiological processes. Even though it was already reported that gulls accumulate Po...
Seabirds as bioindicators of anthropogenic and chemical pollution
Matos, D. M.; Ramos, J. A.; Brandão, L. C.; Bessa, F.; Silva, V.; Rodrigues, I.; Antunes, S.; dos Santos, I.; Coentro, J.; Cunha, S. C.Background: Marine pollution, caused by anthropogenic debris, is a significant environmental issue that has detrimental effects on marine ecosystems [1]. Finding suitable sentinel species of the human impacts on the oceans, is imperative. As top predators, seabirds are considered sentinels of the marine environment [2]. Objective: To provide quantitative data about the distinctive prevalence of anthropogeni...
Effects of stress exposure in captivity on physiology and infection in avian ho...
Norte, A. C.; Araújo, P. M.; Augusto, L.; Guímaro, H.; Santos, S.; Lopes, R. J.; Núncio, M. S.; Ramos, J. A.; Lopes de Carvalho, I.Exposure to environmental stressors, an increasingly recurring event in natural communities due to anthropogenic-induced environmental change, profoundly impacts disease emergence and spread. One mechanism through which this occurs is through stress-induced immunosuppression increasing disease susceptibility, prevalence, intensity and reactivation in hosts. We experimentally evaluated how exposure to stressors ...
Show your beaks and we tell you what you eat: Different ecology in sympatric An...
Matias, R. S.; Gregory, S.; Ceia, F. R.; Baeta, A.; Seco, J.; Rocha, M. S.; Fernandes, Emanuel Mouta; Reis, R. L.Sympatry can lead to higher competition under climate change and other environmental pressures, including in South Georgia, Antarctica, where the two most common octopod species, Adelieledone polymorpha and Pareledone turqueti, occur side by side. Since cephalopods are typically elusive animals, the ecology of both species is poorly known. As beaks of cephalopods are recurrently found in top predator's stomachs...
The importance of lizards and small mammals as reservoirs for Borrelia lusitani...
Norte, A.C.; Alves da Silva, A.; Alves, J.; da Silva, L. P.; Núncio, M. S.; Escudero, R.; Anda, P.; Ramos, J. A.; Lopes de Carvalho, I.Borrelia lusitaniae is a pathogen frequent in the Mediterranean area. Apart from lizards, evidence for birds and small mammals as competent reservoirs for this genospecies has been occasional. We collected questing ticks, skin biopsies and Ixodes sp. ticks feeding on lizards, birds and small mammals in a B. burgdorferi s.l. (sensu lato) enzootic area to assess their importance in the maintenance of B. lusitania...
Reproductive parameters of tropical lesser noddies respond to local variations ...
Monticelli, David; Ramos, J. A.; Catry, Teresa; Pedro, Patricia; Paiva, Vitor H.Most attempts to link seabirds and climate/oceanographic effects have concerned the Atlantic and Pacific Oceans with comparatively few studies in the tropical Indian Ocean. This paper examines the reproductive response of the lesser noddy Anous tenuirostris to temporal fluctuations in oceanographic and climatic conditions using 8 years of monitoring data from Aride Island (Seychelles), tropical Western Indian O...
The importance of lizards and small mammals as reservoirs for Borrelia lusitani...
Norte, A. C.; Silva, A. Alves da; Alves, J.; Silva, L. P. da; Núncio, M. S.; Escudero, R.; Anda, P.; Ramos, J. A.; Carvalho, I. Lopes deBorrelia lusitaniae is a pathogen frequent in the Mediterranean area. Apart from lizards, evidence for birds and small mammals as competent reservoirs for this genospecies has been occasional. We collected questing ticks, skin biopsies and Ixodes sp. ticks feeding on lizards, birds and small mammals in a B. burgdorferi s.l. enzootic area to assess their importance in the maintenance of B. lusitaniae. B. lusitan...
Polar marine biology science in Portugal and Spain: Recent advances and future ...
Xavier, José C.; Barbosa, Andrés; Agustí, Susana; Alonso-Sáez, Laura; Alvito, Pedro; Ameneiro, Julia; Ávila, Conxita; Baeta, Alexandra; Canário, JoãoPolar marine ecosystems have global ecological and economic importance because of their unique biodiversity and their major role in climate processes and commercial fisheries, among others. Portugal and Spain have been highly active in a wide range of disciplines in marine biology of the Antarctic and the Arctic. The main aim of this paper is to provide a synopsis of some of the results and initiatives undertak...
Past and present trophic position and decadal changes in diet of Yellow-legged ...
Pedro, Patricia I.; Ramos, J. A.; Neves, Verónica C.; Paiva, Vitor H.This study evaluates the trophic position of adult Yellow-legged Gulls Larus michahellis atlantis resident in the Azores archipelago in the past (1921–1928) and in the present (2009–2010), and analyses the decadal variation in the diet of breeding birds from the 1990s to the 2000s for three main colonies (Topo Islet, Baixo Islet and Mistério da Prainha). Using mixing models, we compared stable isotope signature...
Relation between climatic factors, diet and reproductive parameters of Little T...
Ramos, J. A.; Pedro, Patricia; Matos, Antonio; Paiva, Vitor H.We used 10 years of data on clutch size, egg size and diet, and 8 years of data on timing of laying on Little Terns (Sternula albifrons) breeding in Ria Formosa lagoon system, Algarve, Portugal to assess whether diet acts as an important intermediary between climatic conditions and breeding parameters. We used Generalized Linear Models to relate (1) the relative occurrence and size of the main prey species, san...