Mostrando recursos 1 - 11 de 11

  1. Do Cory’s Shearwaters Calonectris borealis choose mates based on size?

    Nava, Cristina P.; Kim, Sin-Yeon; Magalhães, Maria C.; Neves, Verónica C.
    Many bird species rely on visual cues for mate choice, including those provided by body size or by the size of a body appendage. Mate choice based on size may lead to size-assortative mating, which may in turn have consequences for reproductive performance. In this study, we examined whether body size influences mate choice decisions of Cory’s Shearwater Calonectris borealis, a seabird with nocturnal activity on land. We found evidence of negative assortative mating for bill morphology (nostril height and bill length), but found no assortative mating according to body mass, tarsus length, and wing length. In addition, we investigated...

  2. The role of Malcolm Clarke (1930–2013) in the Azores as a scientist and educationist

    Gomes-Pereira, José N.; Prieto, Rui; Neves, Verónica C.; Xavier, J.; Pham, Christopher K.; Gonçalves, João M.; Porteiro, Filipe M.; Santos, Ricardo S.; Martins, Helen R.
    Malcolm Roy Clarke (1930–2013) was a British teuthologist who made an important contribution to marine science in the Azores archipelago (Portugal). Malcolm started doing research in the Azores from 1980s onward, settling for residency in 2000 after retirement (in 1987). He kept publishing on Azorean cephalopods collaborating in 20% of the peer reviewed works focus- ing on two main areas: dietary studies; and the ecology of cephalopods on seamounts. Since his first visit in 1981, he was involved in the description of the dietary ecology of several cetaceans, seabirds, and large pelagic and deep-water fish. Using his own data, Malcolm...

  3. Migration routes and non-breeding areas of Common Terns (Sterna hirundo) from the Azores

    Neves, Verónica C.; Nava, Cristina P.; Cormons, Matt; Bremer, Esteban; Castresana, Gabriel; Lima, Pedro; Junior, Severino M. Azevedo; Phillips, Richard A.; Magalhães, Maria C.; Santos, Ricardo S.
    We describe the migration routes and non-breeding areas of Common Terns (Sterna hirundo) from the Azores Archipelago, based on ringing (banding) recoveries and tracking of three birds using geolocators. Over 20 years, there have been 55 transatlantic recoveries of Common Terns from the Azores population: six from Argentina and 49 from Brazil. The three tracked birds migrated south in different months (August, September, November), but the northern migration was more synchronous, with all leaving in April. The birds were tracked to three areas of the South American coast: the male spent November—April on the northern Brazilian coast (13°N–2°S), whereas the...

  4. Leapfrog migration and habitat preferences of a small oceanic seabird, Bulwer's petrel (Bulweria bulwerii)

    Ramos, Raül; Sanz, Víctor; Militão, Teresa; Bried, Joël; Neves, Verónica C.; Biscoito, Manuel; Phillips, Richard A.; Zino, Francis; González-Solís, Jacob
    AIM: Our current understanding of migratory strategies and the reasons for their high variability along the phylogenetic tree remains relatively poor. Most of the hypotheses relating to migration have been formulated for terrestrial taxa; classically, oceanic migrations were considered as merely dispersive because of the scarcity of observations in the open ocean. We describe for the first time, the migration strategy of a small seabird, the Bulwer's petrel (Bulweria bulwerii), and provide new insights into the ecology and evolution of long-distance marine migrations. LOCATION: Subtropical and tropical Atlantic Ocean. METHODS: Using cutting-edge geolocators, we examined the year-round distribution and at-sea activity patterns...

  5. Seabird mortality induced by land-based artificial lights

    Rodríguez, Airam; Holmes, Nick D.; Ryan, Peter G.; Wilson, Kerry-Jayne; Faulquier, Lucie; Murillo, Yovana; Raine, André F.; Penniman, Jay F.; Neves, Verónica C.; Rodríguez, Beneharo; Negro, Juan J.; Chiaradia, André; Dann, Peter; Anderson, Tracy; Metzger, Benjamin; Shirai, Masaki; Deppe, Lorna; Wheeler, Jennifer; Hodum, Peter; Gouveia, Cátia; Carmo, Vanda; Carreira, Gilberto P.; Delgado-Alburqueque, Luis; Guerra-Correa, Carlos; Couzi, François-Xavier; Travers, Marc; Corre, Matthieu Le
    Artificial lights at night cause high mortality of seabirds, one of the most endangered groups of birds globally. Fledglings of burrow-nesting seabirds, and to a lesser extent adults, are attracted to and then grounded (i.e., forced to land) by lights when they fly at night. We reviewed the current state of knowledge of seabird attraction to light to identify information gaps and propose measures to address the problem. Although species in families such as Alcidae and Anatidae can be grounded by artificial light, the most affected seabirds are petrels and shearwaters (Procellariiformes). At least 56 species of Procellariiformes, more than...

  6. Seabird mortality induced by land-based artificial lights

    Rodríguez, Airam; Holmes, Nick D.; Ryan, Peter G.; Wilson, Kerry-Jayne; Faulquier, Lucie; Murillo, Yovana; Raine, André F.; Penniman, Jay F.; Neves, Verónica C.; Rodríguez, Beneharo; Negro, Juan J.; Chiaradia, André; Dann, Peter; Anderson, Tracy; Metzger, Benjamin; Shirai, Masaki; Deppe, Lorna; Wheeler, Jennifer; Hodum, Peter; Gouveia, Cátia; Carmo, Vanda; Carreira, Gilberto P.; Delgado-Alburqueque, Luis; Guerra-Correa, Carlos; Couzi, François-Xavier; Travers, Marc; Corre, Matthieu Le
    Artificial lights at night cause high mortality of seabirds, one of the most endangered groups of birds globally. Fledglings of burrow-nesting seabirds, and to a lesser extent adults, are attracted to and then grounded (i.e., forced to land) by lights when they fly at night. We reviewed the current state of knowledge of seabird attraction to light to identify information gaps and propose measures to address the problem. Although species in families such as Alcidae and Anatidae can be grounded by artificial light, the most affected seabirds are petrels and shearwaters (Procellariiformes). At least 56 species of Procellariiformes, more than...

  7. Depredation of Monteiro's Storm-petrel (Hydrobates monteiroi) Chicks by Madeiran Wall Lizard (Lacerta dugesii)

    Neves, Verónica C.; Nava, Cristina; Monteiro, Eva; Monteiro, Paulo R.; Bried, Joël
    Monteiro’s Storm-petrel (Hydrobates monteiroi) is a small seabird endemic to the Azores archipelago, where it is known to breed only on two mammal-free islets. Total breeding numbers are between 250 and 300 pairs. During the 2015 breeding season on Praia Islet, six Madeiran wall lizards (Lacerta dugesii) were observed depredating a Monteiro’s Storm-petrel chick about to fledge. In August 2015, a freshly killed chick without its head and four larger dead chicks were found. Eight other chicks had disappeared from their nests since our previous visit in early July. In 2016, there was further evidence of suspected lizard depredation. Three...

  8. Depredation of Monteiro's Storm-petrel (Hydrobates monteiroi) Chicks by Madeiran Wall Lizard (Lacerta dugesii)

    Neves, Verónica C.; Nava, Cristina; Monteiro, Eva; Monteiro, Paulo R.; Bried, Joël
    Monteiro’s Storm-petrel (Hydrobates monteiroi) is a small seabird endemic to the Azores archipelago, where it is known to breed only on two mammal-free islets. Total breeding numbers are between 250 and 300 pairs. During the 2015 breeding season on Praia Islet, six Madeiran wall lizards (Lacerta dugesii) were observed depredating a Monteiro’s Storm-petrel chick about to fledge. In August 2015, a freshly killed chick without its head and four larger dead chicks were found. Eight other chicks had disappeared from their nests since our previous visit in early July. In 2016, there was further evidence of suspected lizard depredation. Three...

  9. Reduced population size does not affect the mating strategy of a vulnerable and endemic seabird

    Nava, Cristina; Neves, Verónica C.; Andris, Malvina; Dubois, Marie-Pierre; Jarne, Philippe; Bolton, Mark; Bried, Joël
    Bottleneck episodes may occur in small and isolated animal populations, which may result in decreased genetic diversity and increased inbreeding, but also in mating strategy adjustment. This was evaluated in the vulnerable and socially monogamous Monteiro's Storm-petrel Hydrobates monteiroi, a seabird endemic to the Azores archipelago which has suffered a dramatic population decline since the XVth century. To do this, we conducted a genetic study (18 microsatellite markers) in the population from Praia islet, which has been monitored over 16 years. We found no evidence that a genetic bottleneck was associated with this demographic decline. Monteiro's Storm-petrels paired randomly with respect...

  10. Testing the usefulness of hydrogen and compound-specific stable isotope analyses in seabird feathers : a case study in two sympatric Antarctic storm-petrels

    Quillfeldt, Petra; Thorn, Simon; Richter, Benjamin; Nabte, Marcela; Coria, Nestor; Masello, Juan F.; Massaro, Melanie; Neves, Verónica C.; Libertelli, Marcela
    Nitrogen and carbon stable isotopes provide tools to investigate ecological segregation, prey choice and spatial distribution in seabirds. However, the interpretation of stable isotopes is frequently hampered by a lack of isotopic baseline data. In this study, two techniques proposed to overcome such shortages were tested: compound-specific isotope analyses of amino acids (AA-CSIA) and the analysis of hydrogen stable isotope ratios (HSIA). Feathers of two sympatric storm-petrels were compared. The two species, Black-bellied storm-petrels Fregetta tropicaand Wilson’s storm-petrels Oceanites oceanicus, moult in oceanic waters and differ in diet composition. For HSIA, a range of species with broad diet and non-breeding...

  11. Black rat Rattus rattus eradication by trapping allows recovery of breeding roseate tern Sterna dougallii and common tern S.hirundo populations on Feno Islet, the Azores, Portugal

    Amaral, João J. S.; Almeida, Sérgio; Sequeira, Maria; Neves, Verónica C.
    Mass trapping successfully achieved elimination of black rat Rattus rattus on Feno islet (1.6 ha), Terceira island (Azores archipelago), thus enabling roseate terns Sterna dougallii and common terns Sterna hirundo to recolonize the islet. Rats were first detected on Feno in 2003, when tern breeding-numbers had decreased dramatically. During 2005 no terns bred on the islet and in 2006 fewer than five common tern pairs attempted to nest. Rat eradication was initiated in September 2006. The last rats were captured in March 2007. Monitoring conducted in September 2007, and May and September 2008 indicated that rats had not recolonized. Common...

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