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Macaronesia

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Macaronesia is a collection of four volcanic archipelagos located in the North Atlantic Ocean.

Macaronesia location
Macaronesia location

These island groups sit off the coasts of both Europe and North Africa. The region is composed of several oceanic islands that formed from seamounts. A seamount is an underwater mountain that rises from the ocean floor. Over time, volcanic activity pushed these peaks above the ocean surface. Today, Macaronesia is recognized as a unique bioregion by the European Environment Agency. It is also classified within the botanical continent of Africa by the World Geographical Scheme for Recording Plant Distributions.

The political structure of these islands is quite varied. The Azores and Madeira are autonomous regions belonging to Portugal. The Canary Islands serve as an autonomous community of Spain. Cape Verde is different because it is a sovereign state and a member of the United Nations.

Macaronesia location
Macaronesia location

Because of these political ties, the islands belong to different international groups. The Portuguese and Spanish islands are part of the European Union. However, Cape Verde is a member of the African Union. In 2022, the total population of Macaronesia was estimated at 3,222,054 people. The Canary Islands held the largest share with 2,172,944 residents. Cape Verde had 561,901 people, Madeira had 250,769, and the Azores had 236,440.

Geologically, the islands were created by volcanic hotspots. Most of Macaronesia sits upon the African tectonic plate. The Azores are located in a unique area called a triple junction. This is a place where three plates meet: the Eurasian, African, and North American plates.

Tephra Layers at Capelinhos volcano in Azores 2014
Tephra Layers at Capelinhos volcano in Azores 2014

This volcanic history is visible in the landscape. For example, layers of volcanic tephra can be seen from eruptions. Tephra is the rock and debris ejected during a volcanic event. The varied heights and locations of the islands create many different climates. The Azores experience oceanic and humid subtropical climates. Madeira features a tropical savanna climate. The Canary Islands contain desert and semi-desert climates. Cape Verde maintains a tropical climate.

The history of the name Macaronesia reaches back to Ancient Greece. Greek geographers used the term to describe any islands west of the Strait of Gibraltar. The name comes from Greek words meaning "islands of the fortunate." The term was not used for a long period of time. It was eventually revived in 1917 to describe this specific group of islands. Sometimes, the name is misspelled as "Macronesia." This mistake happens because people think it is related to Micronesia. However, Micronesia is an unrelated group of islands located in the Pacific Ocean.

Macaronesia is famous for its unique biogeography. Because these islands were never connected to a continent, life had to arrive via long-distance dispersal. This means plants and animals traveled across the ocean to reach the islands. Many species are endemic, which means they live nowhere else on Earth. The jumping spider genus Macaroeris is named after this region. One of the most important features is the laurisilva forest. These are mountain cloud forests that contain relict plant species. Relict species are survivors from an earlier time. These forests resemble the vegetation that once covered the Mediterranean Basin.

These laurisilva forests are very special ecosystems. They once covered much of the Azores, Madeira, and parts of the Canary Islands. These forests grow at altitudes between 200 and 1,000 meters. The eastern Canaries and Cape Verde are generally too dry for these forests. The trees in these forests include genera such as Apollonias, Clethra, and Dracaena. Fossil evidence shows these plants flourished in the Mediterranean before the ice ages. During the ice ages, the climate became much cooler and drier. The laurisilva forests survived in these specific island locations.

Levada do Caldeirão Verde, Madeira (09611)
Levada do Caldeirão Verde, Madeira (09611)

Today, these ecosystems face many conservation challenges. Human activity has displaced much of the original native vegetation. People have cleared forests for timber and firewood. They have also cleared land for agriculture and grazing. Introducing foreign plants and animals has caused further changes. The laurisilva habitat is now reduced to small, disconnected pockets. This makes it harder for endemic species to survive.

One major threat to local animals is the presence of introduced predators. Domestic cats, including feral populations, are a serious concern. These cats eat foreign animals like rabbits and rodents. However, this large supply of food helps the cat population grow very large. This leads to hyperpredation. Hyperpredation occurs when a high number of predators causes extra damage to local species. In this case, cats end up preying on endemic reptiles and birds. To help, the European Union uses Natura 2000 regulations to protect the land. Since 2001, these efforts have protected 500,000 square kilometers of land and sea in the Azores, Madeira, and the Canary Islands.

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🖼️ Images & Media (3)
File:Macaronesia location.svg
Macaronesia location.svg
File:Tephra Layers at Capelinhos volcano in Azores 2014.jpg
Tephra Layers at Capelinhos volcano in...
File:Levada do Caldeirão Verde, Madeira (09611).jpg
Levada do Caldeirão Verde, Madeira (09611).jpg
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