7 documents found, page 1 of 1
Site‐level connectivity identified from multiple sources of movement data to in...
Beal, Martin; Nightingale, Josh; Belo, João R.; Batey, Chris; Belting, Heinrich; Bocher, Pierrick; Burgess, Malcolm; Craft, Taylor B.; Crockford, NicolaMigratory birds depend on a suite of sites across their annual cycles, making them vulnerable to a wide variety of anthropogenic pressures. Current area-based conservation measures have been found inadequate to safeguard migratory birds, in part due to a lack of consideration for the connectivity between sites mediated by the movements of individuals. To address this issue, we develop a network analysis integra...
Seasonal Variation in the Diet of Migratory Shorebirds Wintering in the Bijagós...
Coelho, Ana P.; Lopes, Paula; Rocha, Afonso D.; Barros, Aissa R. de; Piersma, Theunis; Alves, José A.As on intertidal flats across the globe, the migratory shorebirds that spend most of their annual cycle in the Bijagós Archipelago, Guinea-Bissau, feed on macro zoobenthic prey buried in the intertidal soft sediments. Understanding the diet of shorebirds throughout the period of residence in the Bijagós can help to under stand the degree of their trophic flexibility. In this study, we first reconstruct the diet...
Population- and age-specific patterns of haemosporidian assemblages and infecti...
Emmenegger, Tamara; Alves, José A.; Rocha, Afonso D.; Costa, Joana Santos; Schmid, Raffaella; Schulze, Martin; Hahn, SteffenAmongst other factors, host behaviour critically determines the patterns with which blood parasites occur in wild host populations. In particular, migratory hosts that sequentially occupy distant sites within and across years are expected to show distinct patterns of blood parasitism depending on their population-specific schedules and whereabouts. Here, we monitored haemosporidian parasitism in two populations...
High Migratory Survival and Highly Variable Migratory Behavior in Black-Tailed ...
Senner, Nathan R.; Verhoeven, Mo A.; Abad-Gómez, José M.; Alves, José A.; Hooijmeijer, Jos C. E. W.; Howison, Ruth A.; Kentie, RosemarieFew studies have been able to directly measure the seasonal survival rates of migratory species or determine how variable the timing of migration is within individuals and across populations over multiple years. As such, it remains unclear how likely migration is to affect the population dynamics ofmigratory species and how capablemigrantsmay be of responding to changing environmental conditions within their li...
Understanding how birds rebuild fat stores during migration: insights from an e...
Araújo, Pedro M.; Viegas, Ivan; Rocha, Afonso D.; Villegas, Auxiliadora; Jones, John G.; Mendonça, Liliana; Ramos, Jaime A.; Masero, José A.Mechanisms underlying fat accumulation for long-distance migration are not fully understood. This is especially relevant in the context of global change, as many migrants are dealing with changes in natural habitats and associated food sources and energy stores. The continental Black-tailed godwit Limosa limosa limosa is a long-distance migratory bird that has undergone a considerable dietary shift over the pas...
The effects of habitat type and volcanic eruptions on the breeding demography o...
Katrinardottir, Borgný; Alves, José A.; Sigurjónsdottir, Hrefna; Hersteinsson, Páll; Gunnarsson, Tómas G.Distinct preference of species for habitats is most often driven by long term differences in demographic rates between habitats. Estimating variation in those rates is key for developing successful conservation strategies. Stochastic events can interact with underlying variation in habitat quality in regulating demography but the opportunities to explore such interactions are rare. Whimbrels in Iceland show a s...
Long-term declines of wader populations at the Tagus estuary, Portugal: A respo...
Catry, Teresa; Alves, José A.; Andrade, Joana; Costa, Helder; Dias, Maria P.; Fernandes, Pedro; Leal, Ana; Lourenço, Pedro Miguel; Martins, Ricardo C.Migratory wader populations face global threats, mainly related to increasing rates of habitat loss and disturbance driven by human activities. To a large extent, the long-term survival of these populations requires the conservation of networks of sites along their migratory flyways. The Tagus estuary, Portugal, is among the most important wetlands for waders in the East Atlantic Flyway. Annual winter wader cou...