Spectacled Petrel
Encyclopedia
The Spectacled Petrel, Procellaria conspicillata, is a rare seabird
that nests only on the high western plateau of Inaccessible Island
in the Tristan da Cunha
group. It is one of the largest petrel
s that nest in burrows.
. It does have white bands around its eyes, and it’s bill
is yellow. Their lifespan averages 26.4 years.
genus
, and in turn is a member of the Procellariidae
family
, and the Procellariiformes
order
. As a member of the Procellariiformes, they share certain identifying features. First, they have nasal passages that attach to the upper bill called naricorns. Although the nostrils on the Prion are on top of the upper bill. The bills of Procellariiformes are also unique in that they are split into between 7 and 9 horny plates. They produce a stomach oil made up of wax ester
s and triglycerides that is stored in the proventriculus
. This is used against predators as well as an energy rich food source for chicks and for the adults during their long flights. Finally, they also have a salt gland that is situated above the nasal passage and helps desalinate their bodies, due to the high amount of ocean water that they imbibe. It excretes a high saline solution from their nose.
In 2004, BirdLife International split the Spectacled Petrel, Procellaria conspicillata, from the White-chinned Petrel
, Procellaria aequinoctialis, which had been considered conspecific or even a color morph
.
words, procella meaning a storm and arius a suffix meaning pertaining to. This is in reference to their association with stormy weather. The word Petrel is derived from St. Peter and the story of his walking on water. This is in reference to the Petrels habit of appearing to run on the water to take off.
. They also range east to the west coast of southern Africa
, and it is believed that they were found throughout the southern Indian Ocean
, in the 19th century.
During breeding season, they inhabit Inaccessible Island
, of the Tristan da Cunha
group. In the past, they probably bred on Amsterdam Island as well.
by the IUCN in 2000. A subsequent study gave cautious hope for a continuing recovery of the population from an all-time low of merely some dozens of pairs in the 1930s. Indeed it appears as if the species' numbers have been underestimated in more recent years as an accurate census is difficult due to the rugged terrain of its island home. Consequently, the conservation status of this species is downgraded to Vulnerable
in the 2007 IUCN Red List
. The 2009 assessment maintained their status at vulnerable.
This Petrel has an occurrence range of 9670000 km² (3,733,607.9 sq mi) and a population estimated at between 31,000 and 45,000. Their population is trending up at between 1% and 9% over 60 years, and possibly 45% over the last five years.
The Spectacled Petrel is threatened by interactions with longline fisheries
which kills hundreds of birds every year as they become entangled in the fishing lines and drown. Other threats comes from feral pigs, the Black Rat
and other rat species.
The Spectacled Petrel is listed on CMS Appendix II
and ACAP Annex 1
. A census was conducted in 2004, and Inaccessible Island
is in nature reserve, with restricted access. To help the species other conservation measures have been proposed. Conducting surveys of the breeding population as an ongoing process. Pushing for adoption of the best-practice mitigation measures in fisheries within this birds range, utilizing organizations such as the FAO
, ACAP
, ICCAT. Restricting access to prevent colonization of introduced species. Nominating Inaccessible Island for world heritage site
status. Finally, looking for other breeding locations.
Seabird
Seabirds are birds that have adapted to life within the marine environment. While seabirds vary greatly in lifestyle, behaviour and physiology, they often exhibit striking convergent evolution, as the same environmental problems and feeding niches have resulted in similar adaptations...
that nests only on the high western plateau of Inaccessible Island
Inaccessible Island
Inaccessible Island is an extinct volcano, 14 km² in area, rising out of the South Atlantic Ocean 45 km southwest of Tristan da Cunha. Inaccessible Island is located at . It is part of the archipelago of Tristan da Cunha, which is part of the overseas territory of the United Kingdom,...
in the Tristan da Cunha
Tristan da Cunha
Tristan da Cunha is a remote volcanic group of islands in the south Atlantic Ocean and the main island of that group. It is the most remote inhabited archipelago in the world, lying from the nearest land, South Africa, and from South America...
group. It is one of the largest petrel
Petrel
Petrels are tube-nosed seabirds in the bird order Procellariiformes. The common name does not indicate relationship beyond that point, as "petrels" occur in three of the four families within that group...
s that nest in burrows.
Description
The Spectacled Petrel is a large, approximately 55 centimetres (21.7 in) in length, predominately black PetrelPetrel
Petrels are tube-nosed seabirds in the bird order Procellariiformes. The common name does not indicate relationship beyond that point, as "petrels" occur in three of the four families within that group...
. It does have white bands around its eyes, and it’s bill
Beak
The beak, bill or rostrum is an external anatomical structure of birds which is used for eating and for grooming, manipulating objects, killing prey, fighting, probing for food, courtship and feeding young...
is yellow. Their lifespan averages 26.4 years.
Taxonomy
The Spectacled Petrel is a member of the ProcellariaProcellaria
Procellaria is a genus of southern ocean long-winged seabirds related to prions and a member of the Procellariiformes order.-Taxonomy:Procellaria is a member of the family Procellariidae and the order procellariiformes. As members of Procellariiformes, they share certain characteristics. First they...
genus
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...
, and in turn is a member of the Procellariidae
Procellariidae
The family Procellariidae is a group of seabirds that comprises the fulmarine petrels, the gadfly petrels, the prions, and the shearwaters. This family is part of the bird order Procellariiformes , which also includes the albatrosses, the storm-petrels, and the diving petrels.The procellariids are...
family
Family (biology)
In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...
, and the Procellariiformes
Procellariiformes
Procellariiformes is an order of seabirds that comprises four families: the albatrosses, petrels and shearwaters, storm petrels, and diving petrels...
order
Order (biology)
In scientific classification used in biology, the order is# a taxonomic rank used in the classification of organisms. Other well-known ranks are life, domain, kingdom, phylum, class, family, genus, and species, with order fitting in between class and family...
. As a member of the Procellariiformes, they share certain identifying features. First, they have nasal passages that attach to the upper bill called naricorns. Although the nostrils on the Prion are on top of the upper bill. The bills of Procellariiformes are also unique in that they are split into between 7 and 9 horny plates. They produce a stomach oil made up of wax ester
Wax ester
An ester of a fatty acid and a long-chain alcohol. These oils have similar properties as triglycerides, but are indigestible. They are found in some fish such as orange roughy, oilfish, escolar, black oreo, smooth oreo and other deep water fish. They are also present in marine copepods. Wax...
s and triglycerides that is stored in the proventriculus
Proventriculus
The proventriculus is part of the digestive system of birds, invertebrates and insects.-Birds:The proventriculus is a standard part of avian anatomy...
. This is used against predators as well as an energy rich food source for chicks and for the adults during their long flights. Finally, they also have a salt gland that is situated above the nasal passage and helps desalinate their bodies, due to the high amount of ocean water that they imbibe. It excretes a high saline solution from their nose.
In 2004, BirdLife International split the Spectacled Petrel, Procellaria conspicillata, from the White-chinned Petrel
White-chinned Petrel
The White-chinned Petrel or Cape Hen, Procellaria aequinoctialis, is a large shearwater in the family Procellariidae. It ranges around the Southern Oceans as far north as South Australia, Peru and Namibia, and breeds colonially on scattered islands....
, Procellaria aequinoctialis, which had been considered conspecific or even a color morph
Polymorphism (biology)
Polymorphism in biology occurs when two or more clearly different phenotypes exist in the same population of a species — in other words, the occurrence of more than one form or morph...
.
Etymology
Procellaria comes from two LatinLatin
Latin is an Italic language originally spoken in Latium and Ancient Rome. It, along with most European languages, is a descendant of the ancient Proto-Indo-European language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and...
words, procella meaning a storm and arius a suffix meaning pertaining to. This is in reference to their association with stormy weather. The word Petrel is derived from St. Peter and the story of his walking on water. This is in reference to the Petrels habit of appearing to run on the water to take off.
Breeding
This Petrel breeds annually and will lay one egg in its nest, which is situated in wet heath above 380 m (1,246.7 ft). Their nests are burrows along the banks of rivers, and also in marshes.Range and habitat
The Spectacled Petrel is pelagic and during non-breeding season the majority of these Petrels can be found off the coast of Southern BrazilBrazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...
. They also range east to the west coast of southern Africa
Africa
Africa is the world's second largest and second most populous continent, after Asia. At about 30.2 million km² including adjacent islands, it covers 6% of the Earth's total surface area and 20.4% of the total land area...
, and it is believed that they were found throughout the southern Indian Ocean
Indian Ocean
The Indian Ocean is the third largest of the world's oceanic divisions, covering approximately 20% of the water on the Earth's surface. It is bounded on the north by the Indian Subcontinent and Arabian Peninsula ; on the west by eastern Africa; on the east by Indochina, the Sunda Islands, and...
, in the 19th century.
During breeding season, they inhabit Inaccessible Island
Inaccessible Island
Inaccessible Island is an extinct volcano, 14 km² in area, rising out of the South Atlantic Ocean 45 km southwest of Tristan da Cunha. Inaccessible Island is located at . It is part of the archipelago of Tristan da Cunha, which is part of the overseas territory of the United Kingdom,...
, of the Tristan da Cunha
Tristan da Cunha
Tristan da Cunha is a remote volcanic group of islands in the south Atlantic Ocean and the main island of that group. It is the most remote inhabited archipelago in the world, lying from the nearest land, South Africa, and from South America...
group. In the past, they probably bred on Amsterdam Island as well.
Conservation
The species was classified as Critically EndangeredCritically Endangered
Critically Endangered is the highest risk category assigned by the IUCN Red List for wild species. Critically Endangered means that a species' numbers have decreased, or will decrease, by 80% within three generations....
by the IUCN in 2000. A subsequent study gave cautious hope for a continuing recovery of the population from an all-time low of merely some dozens of pairs in the 1930s. Indeed it appears as if the species' numbers have been underestimated in more recent years as an accurate census is difficult due to the rugged terrain of its island home. Consequently, the conservation status of this species is downgraded to Vulnerable
Vulnerable species
On 30 January 2010, the IUCN Red List of Threatened Species identified 9694 Vulnerable species, subspecies and varieties, stocks and sub-populations.-References:...
in the 2007 IUCN Red List
IUCN Red List
The IUCN Red List of Threatened Species , founded in 1963, is the world's most comprehensive inventory of the global conservation status of biological species. The International Union for Conservation of Nature is the world's main authority on the conservation status of species...
. The 2009 assessment maintained their status at vulnerable.
This Petrel has an occurrence range of 9670000 km² (3,733,607.9 sq mi) and a population estimated at between 31,000 and 45,000. Their population is trending up at between 1% and 9% over 60 years, and possibly 45% over the last five years.
The Spectacled Petrel is threatened by interactions with longline fisheries
Long-line fishing
Longline fishing is a commercial fishing technique. It uses a long line, called the main line, with baited hooks attached at intervals by means of branch lines called "snoods". A snood is a short length of line, attached to the main line using a clip or swivel, with the hook at the other end....
which kills hundreds of birds every year as they become entangled in the fishing lines and drown. Other threats comes from feral pigs, the Black Rat
Black Rat
The black rat is a common long-tailed rodent of the genus Rattus in the subfamily Murinae . The species originated in tropical Asia and spread through the Near East in Roman times before reaching Europe by the 1st century and spreading with Europeans across the world.-Taxonomy:The black rat was...
and other rat species.
The Spectacled Petrel is listed on CMS Appendix II
Conservation management system
A conservation management system is a procedure for maintaining a species or habitat in a particular state. It is a means whereby humankind secures wildlife in a favourable condition for contemplation, education or research, in perpetuity. It is an important topic in cultural ecology, where...
and ACAP Annex 1
Agreement on the Conservation of Albatrosses and Petrels
The Agreement on the Conservation of Albatrosses and Petrels is a legally binding international treaty signed in 2001.It was created in order to halt the drastic decline of seabird populations in the Southern Hemisphere, particularly albatrosses and procellariids...
. A census was conducted in 2004, and Inaccessible Island
Inaccessible Island
Inaccessible Island is an extinct volcano, 14 km² in area, rising out of the South Atlantic Ocean 45 km southwest of Tristan da Cunha. Inaccessible Island is located at . It is part of the archipelago of Tristan da Cunha, which is part of the overseas territory of the United Kingdom,...
is in nature reserve, with restricted access. To help the species other conservation measures have been proposed. Conducting surveys of the breeding population as an ongoing process. Pushing for adoption of the best-practice mitigation measures in fisheries within this birds range, utilizing organizations such as the FAO
Fão
Fão is a town in Esposende Municipality in Portugal....
, ACAP
Agreement on the Conservation of Albatrosses and Petrels
The Agreement on the Conservation of Albatrosses and Petrels is a legally binding international treaty signed in 2001.It was created in order to halt the drastic decline of seabird populations in the Southern Hemisphere, particularly albatrosses and procellariids...
, ICCAT. Restricting access to prevent colonization of introduced species. Nominating Inaccessible Island for world heritage site
World Heritage Site
A UNESCO World Heritage Site is a place that is listed by the UNESCO as of special cultural or physical significance...
status. Finally, looking for other breeding locations.