10 documents found, page 1 of 1
Cleavage of the TrkB-FL receptor during epileptogenesis: insights from a kainic...
Ribeiro Rodrigues, Leonor; Fonseca-Gomes, João; Paulo, Sara L; Viais, Ricardo; Ribeiro, Filipa; Miranda-Lourenço, Catarina; Mouro, FranciscoBrain-derived neurotrophic factor (BDNF) is essential for neuronal survival, differentiation, and plasticity. In epilepsy, BDNF exhibits a dual role, exerting both antiepileptic and pro-epileptic effects. The cleavage of its main receptor, full-length tropomyosin-related kinase B (TrkB-FL), was suggested to occur in status epilepticus (SE) in vitro. Moreover, under excitotoxic conditions, TrkB-FL was found to b...
Year-Round Movements of Sooty Terns (Onychoprion fuscatus) Nesting Within One o...
Reynolds, S. James; Wearn, Colin P.; Hughes, B. John; Dickey, Roger C.; Garrett, Lucy J. H.; Walls, Sean; Hughes, Fay T.; Weber, Nicola; Weber, Sam B.Seabirds are among the most threatened birds as a result of acute exposure to many anthropogenic threats. Their effective conservation requires a detailed understanding of how seabirds use marine habitats. Recently, one of the largest no-take marine reserves in the Atlantic was designated in tropical waters surrounding Ascension Island, on which the largest Atlantic population of sooty terns (Onychoprion fuscat...
Year-round at-sea distribution and trophic resources partitioning between two s...
Almeida, Nathalie; Ramos, Jaime A.; Rodrigues, Isabel; Santos, Ivo; Pereira, Jorge M.; Matos, Diana M.; Geraldes, Pedro; Melo, Tommy; Paiva, Vítor H.In the oligotrophic tropical marine environment resources are usually more patchily distributed and less abundant to top predators. Thus, spatial and trophic competition can emerge, especially between related seabird species belonging to the same ecological guild. Here we studied the foraging ecology of two sympatric species-brown booby (BRBO) Sula leucogaster (breeding) and red-footed boobies (RFBO) Sula sula ...
Multispecies tracking reveals a major seabird hotspot in the North Atlantic
Davies, Tammy E.; Carneiro, Ana P.B.; Tarzia, Marguerite; Wakefield, Ewan; Hennicke, Janos C.; Frederiksen, Morten; Hansen, Erpur Snær; Campos, BrunaThe conservation ofmigratory marine species, including pelagic seabirds, is challenging because theirmovements span vast distances frequently beyond national jurisdictions. Here, we aim to identify important aggregations of seabirds in the North Atlantic to inform ongoing regional conservation efforts. Using tracking, phenology, and population data, we mapped the abundance and diversity of 21 seabird species. T...
Monitoring of mercury in the mesopelagic domain of the Pacific and Atlantic oce...
Furtado, Ricardo; Granadeiro, José Pedro; Gatt, Marie Claire; Rounds, Rachel; Horikoshi, Kazuo; Paiva, Vítor H.; Menezes, Dilia; Pereira, EduardaGlobal mercury pollution has markedly and consistently grown over the past 70 years (although with regional variations in trends) and is a source of major concern. Mercury contamination is particularly prevalent in biota of the mesopelagic layers of the open ocean, but these realms are little studied, and we lack a large scale picture of contamination in living organisms of this region. The Bulwer's petrel Bulw...
Long-term changes in habitat and trophic level of Southern Ocean squid in relat...
Abreu, José; Phillips, Richard A.; Ceia, Filipe R.; Ireland, Louise; Paiva, Vítor H.; Xavier, José C.Long-term studies of pelagic nekton in the Southern Ocean and their responses to ongoing environmental change are rare. Using stable isotope ratios measured in squid beaks recovered from diet samples of wandering albatrosses Diomedea exulans, we assessed decadal variation (from 1976 to 2016) in the habitat (δ13C) and trophic level (δ15N) of five important Southern Ocean squid species in relation to indices of e...
Assessment of environmental health based on a complementary approach using meta...
Laranjeiro, Maria I.; Alves, Luís M.; Silva, Joana M.; Calado, Joana G.; Norte, Ana C.; Paiva, Vítor H.; Lemos, Marco F.L.; Ramos, Jaime A.Metal pollution is currently a major issue in marine ecosystems, as organisms, and particularly seabirds, are exposed and accumulating increased levels from several anthropogenic sources. A set of 13 metals were quantified in two gull species breeding in sympatry, and in two distinct colonies separated by ca. 400 km. Oxidative stress was measured, and stable isotope analyses were used to link metal contaminatio...
Olfactory-cued navigation in shearwaters: linking movement patterns to mechanisms
Abolaffio, Milo; Reynolds, Andy M; Cecere, Jacopo G; Paiva, Vítor H.; Focardi, StefanoAfter foraging in the open ocean pelagic birds can pinpoint their breeding colonies, located on remote islands in visually featureless seascapes. This remarkable ability to navigate over vast distances has been attributed to the birds being able to learn an olfactory map on the basis of wind-borne odors. Odor-cued navigation has been linked mechanistically to displacements with exponentially-truncated power-law...
Environmentally driven sexual segregation in a marine top predator
Paiva, Vítor H.; Pereira, Justin da Silva; Ceia, Filipe R.; Ramos, Jaime A.Sexual segregation in foraging occurs in many animal species, resulting in the partitioning of resources and reduction of competition between males and females, yet the patterns and drivers of such segregation are still poorly understood. We studied the foraging movements (GPS-tracking), habitat use (habitat modelling) and trophic ecology (stable isotope analysis) of female and male Cory's shearwaters Calonectr...
First attempted breeding of Manx Shearwater (Puffinus puffinus Brünnich, 1764) ...
Bried, Joël; Geraldes, Pedro; Paiva, Vítor H.The Manx Shearwater Puffinus puffinus (Brünnich, 1764) is a north Atlantic seabird which mainly breeds in Europe. In the Azores, its breeding colonies occur exclusively on the islands from the western group (Flores and Corvo). Here, we report the first breeding attempt observed on Vila islet, Santa Maria (the easternmost island of the archipelago, situated circa 600 km from Flores and Corvo). Our observation co...