Prémio Cagarro D'Ouro  |  Artigos Científicos  |  Parceiros  |  Notícias  |  RESOURCES IN ENGLISH  |  Campanhas Cagarro noutras latitudes
<Junho de 2021>
segterquaquisexsábdom
31123456
78910111213
14151617181920
21222324252627
2829301234
567891011
Zonas
 

Açores
Corvo
Faial
Flores
Graciosa
Pico
Santa Maria
São Jorge
São Miguel
Terceira

 

Atualizado em: 29-10-2020



 

Zeca Garro ... saber mais

Feed de RSS
  icon de rss Ver o feed  
The impact of introduced predators, light-induced mortality of fledglings and poaching on the dynamics of the Cory’s shearwater (Calonectris diomedea) population from the Azores, northeastern subtropical Atlantic

Ano: 2011

Autor: Rémi Fontaine, Olivier Gimenez, Joel Bried

Keywords: Provellariiformes, Population dynamics, Light-induced mortality, Azores, Calonectris diomedea

Publicação: Biological Conservation 144 (2011) 1998-2011


Resumo

Cory’s shearwater (Calonectris diomedea) is a procellariiform seabird which breeds in the Mediterranean and the north-eastern subtropical Atlantic, and which is considered ‘‘Vulnerable’’ in Europe due to recent declines at some localities. In the Azores archipelago (Atlantic), the introduction of mammalian predators
by man has led to petrels being extirpated from the main islands, except for Cory’s shearwater. Currently, the Azorean population of Cory’s shearwaters represents 65% of the species’ world population. However, its dynamics remains unknown, although: (1) numbers might have declined by 43% between 1996 and
2001, (2) on the main islands, the young suffer mortality from introduced mammals, poachers, and urban lights upon fledging, and (3) at sea, the level of fishery mortality remains unknown.
To fill this gap, we conducted a 7-year demographic survey on a mammal-free islet in the Azores to determine adult survival rate using capture-mark-recapture of the breeders and to estimate fecundity. We also assessed urban mortality using the data from the rescue campaigns annually conducted in the archipelago. Urban mortality concerned about 6% of fledglings, but its importance greatly varied among islands. When rescue campaigns occur, the rate might drop below 0.5%. Overall, our simulations concerning the next 100 years do not allow excluding a decrease in Cory’s shearwater numbers in the Azores without rescue campaigns (by 87% under the least favourable scenario). Rescue campaigns should only slow down the decline unless, simultaneously, lower competition for nests compared to Vila
islet allows adults to breed almost every year on the main islands and juvenile survival exceeds a threshold value. Since adult survival rate was high (>0.93), an eventual decline of the Azorean population of Cory’s shearwaters would probably not result from fishery mortality of adults, but rather from poor fledgling productivity and perhaps also from low survival during the first year at sea.

Para aceder ao pdf clique aqui!

Calendário de Eventos
 
<Junho de 2021>
segterquaquisexsábdom
31123456
78910111213
14151617181920
21222324252627
2829301234
567891011
Pesquisa
 
 
<Junho de 2021>
segterquaquisexsábdom
31123456
78910111213
14151617181920
21222324252627
2829301234
567891011
Últimos conteúdos
 
São ROque do Pico resgata 72 cagarros
Salvo 1º Cagarro da Ilha Graciosa – Camp...
SOS Cagarro arranca hoje em formato onli...
Salvo cagarro com 7 anos na ilha do Corv...
 
 
 
“O Cagarro”
“Cagarro, cagarrinho”
“Aves vindas do mar”
"DJ Cagarro Master"
 
 
 



 

 

INÍCIOCAMPANHAO CAGARROINICIATIVASBRIGADAS CIENTÍFICASRECURSOSRELATÓRIOSCONTACTOSLUMINAVES

©2004-2021 Presidência do Governo dos Açores
Todos os Direitos Reservados

Portal do Governo dos Açores
Governo Regional dos Açores  UE