The Desertas Islands ( pt, Ilhas Desertas, , "Deserted Islands") are a small

archipelago An archipelago ( ), sometimes called an island group or island chain, is a chain, cluster, or collection of islands, or sometimes a sea containing a small number of scattered islands. Examples of archipelagos include: the Indonesian Arc ...

in the

Atlantic Ocean The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe ...

, part of the larger Portuguese Madeira Archipelago. The archipelago is located off the coast of

Morocco Morocco (),, ) officially the Kingdom of Morocco, is the westernmost country in the Maghreb region of North Africa. It overlooks the Mediterranean Sea to the north and the Atlantic Ocean to the west, and has land borders with Algeria t ...

. Deserta Grande Island is located about southeast of the eastern tip of Madeira Island,

Ponta de São Lourenço Ponta de São Lourenço (Portuguese for the "Point of Saint Lawrence") is the easternmost point of the island of Madeira. It is inside the town of Caniçal and forms a part of the municipality of Machico. Its terrain are made up of rocks and he ...

Geography

The archipelago of the Desertas Islands is a chain of three long and narrow islands that stretch over a north/south distance of . The Desertas Islands, from north to south with approximate area figures, are:

Administration

Administratively, the islands are part of the Municipality of Santa Cruz in Madeira, and in the Santa Cruz

civil parish In England, a civil parish is a type of administrative parish used for local government. It is a territorial designation which is the lowest tier of local government below districts and counties, or their combined form, the unitary authorit ...

. The islands are a designated Portuguese

nature reserve A nature reserve (also known as a wildlife refuge, wildlife sanctuary, biosphere reserve or bioreserve, natural or nature preserve, or nature conservation area) is a protected area of importance for flora, fauna, or features of geological or ...

. A licence is needed to land there.

Natural history

Though near the main island of Madeira, where the islands can often be seen on the horizon, the geology of the Ilhas Desertas is starkly different. The high, long, and rocky islands of the group are barren of

topsoil Topsoil is the upper layer of soil. It has the highest concentration of organic matter and microorganisms and is where most of the Earth's biological soil activity occurs. Description Topsoil is composed of mineral particles and organic matt ...

, and the only

wildlife Wildlife refers to undomesticated animal species, but has come to include all organisms that grow or live wild in an area without being introduced by humans. Wildlife was also synonymous to game: those birds and mammals that were hunted ...

consists of about sixteen

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

bird Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweig ...

s, including eight species of seabirds, and a scarce population of

feral A feral () animal or plant is one that lives in the wild but is descended from domesticated individuals. As with an introduced species, the introduction of feral animals or plants to non-native regions may disrupt ecosystems and has, in some ...

goat The goat or domestic goat (''Capra hircus'') is a domesticated species of goat-antelope typically kept as livestock. It was domesticated from the wild goat (''C. aegagrus'') of Southwest Asia and Eastern Europe. The goat is a member of the a ...

s, rabbits, and

rodent Rodents (from Latin , 'to gnaw') are mammals of the order Rodentia (), which are characterized by a single pair of continuously growing incisors in each of the upper and lower jaws. About 40% of all mammal species are rodents. They are n ...

s, brought from

Portugal Portugal, officially the Portuguese Republic ( pt, República Portuguesa, links=yes ), is a country whose mainland is located on the Iberian Peninsula of Southwestern Europe, and whose territory also includes the Atlantic archipelagos of ...

by the mariners who first reached the rocky shores. The

Deserta Grande wolf spider ''Hogna ingens'', the Deserta Grande wolf spider, is a critically endangered spider species endemic to the Deserta Grande Island of the Madeira archipelago - specifically a remote valley, the Vale de Castanheira. Adult numbers have been estimated ...

and

Madeiran wall lizard The Madeiran wall lizard (''Teira dugesii'') is a species of lizard in the family Lacertidae. It is the only species in the genus ''Teira''. The species is endemic to the Madeira Archipelago, Portugal. In the Azores, this lizard has become natura ...

also exist in the fragile and

arid A region is arid when it severely lacks available water, to the extent of hindering or preventing the growth and development of plant and animal life. Regions with arid climates tend to lack vegetation and are called xeric or desertic. Most ...

ecosystem An ecosystem (or ecological system) consists of all the organisms and the physical environment with which they interact. These biotic and abiotic components are linked together through nutrient cycles and energy flows. Energy enters the syste ...

. The only inhabitable island, with its own water source, is Deserta Grande. This water is murky and scarce, and historic attempts to colonise the island failed due to the impracticability of agriculture. A tiny colony of

Mediterranean monk seal The Mediterranean monk seal (''Monachus monachus'') is a monk seal belonging to the family Phocidae. , it is estimated that fewer than 700 individuals survive in three or four isolated subpopulations in the Mediterranean, (especially) in the Ae ...

s inhabit the beaches, and since 1990 the islands have been constituted as a

for their protection. In 1998 the colony numbered only eight, now the population is approximately forty seals. The only human presence is the permanent wardens, geologists, occasional boaters, and the few research stations on the islands.

Important Bird Area

The Desertas archipelago has been recognised as an Important Bird Area (IBA) by BirdLife International because of its

seabird Seabirds (also known as marine birds) are birds that are 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 enviro ...

colonies In modern parlance, a colony is a territory subject to a form of foreign rule. Though dominated by the foreign colonizers, colonies remain separate from the administration of the original country of the colonizers, the '' metropolitan state'' ...

. These include Fea's and

Bulwer's petrel Bulwer's petrel (''Bulweria bulwerii'') is a small petrel in the family Procellariidae that is found in tropical and subtropical regions of the Atlantic, Indian and Pacific Oceans. It is named after the English naturalist James Bulwer. Taxonomy ...

s, Cory's and Barolo shearwaters, band-rumped storm petrels,

common tern The common tern (''Sterna hirundo'') is a seabird in the family Laridae. This bird has a circumpolar distribution, its four subspecies breeding in temperate and subarctic regions of Europe, Asia and North America. It is strongly migratory ...

s and

Caspian gull The Caspian gull (''Larus cachinnans'') is a large gull and a member of the herring and lesser black-backed gull complex. The scientific name is from Latin. ''Larus'' appears to have referred to a gull or other large seabird, and ''cachinnans'' ...

References

External links