Dollabarat

Dollabarat
Reef (Recife)
Official name: Recife de Dollabarat
Named for: Pierre Dollabarat, captain of who "discovered" the reef by accident on 7 March 1788
Country  Portugal
Autonomous Region  Azores
Islands Eastern Group
Location Azores Platform, Mid-Atlantic Ridge, Atlantic Ocean
Archipelago Azores
Highest point Dollabarat
 - elevation -3 m (-10 ft)
 - coordinates 37°13′28.96″N 24°44′26.83″W / 37.2247111°N 24.7407861°W / 37.2247111; -24.7407861
Area 35.42 km2 (14 sq mi)
Biome Marine (ocean)
Geology Alkali basalt, Tephra, Trachyte, Trachybasalt
Orogeny Volcanism
Period Holocene

The Dollabarat Reef is situated 5 km (3 nautical miles) south-southeast of the Formigas Islets, on the Formigas Bank in the Azores archipelago.

Contents

History

The origin of the name comes from Pierre Dollabarats, the Basque captain of the ship Maria de Sebourre, who had the unlucky honour of discovering the reef as his small boat wrecked on it on 7 March 1788.

Geography

The Dollabarat is part of the Formigas Islets Nature Reserve which covers 35.42 km² (or 3,542 ha).[1] Around the Formigas Reserve, including the Dollabarat, the sea cliffs fall rapidly between 50-70 metres, although gently to the north and south. The gradient around the Dollabarat is less accentuated, which is generally more heterogeneous.[2]

The highest point is just 3 m below sea level. Dollabarat is one of the higher parts of the Formigas Bank, a seamount with similar volcanic origins as the islands of the Azores. The reef was formed from rocks emerging from volcanic activity in submarine volcanos and deeper spaces made up of drained lava holes with an irregular morphology. The deeper parts of the Dollabarat are covered with large rocks and irregular plains covered with a carpet of seaweeds.[3]

Given the relatively shallow waters, the reef is a peril to navigation (similar to sandy shorelines).

Biome

The strong currents, deeper waters and the presence of sharks makes diving difficult for those not familiar with open-ocean diving. The subtidal zone, is a shelter for many fish species, and the abundance of black coral, located around the 15 metere depth in the eastern part of the reef has resulted in a small habitat.[4]

There is a large abundance of sea animals in the vicinity; in addition to species of shark, other species such as sea chub, trigger fish, mantas, turtles and dolphins have been observed in these waters, including the Atlantic Goliath Grouper (usually found in depths between 10–40 m). The floor of the seamount is generally covered in a dense carpet of seaweed, dominated by the Cystoseira species, a seaweed found in deeper areas, and is densely covered. In shallower depths (less than 50 m from the surface) there are populations of Laminaria (large colonies of chestnut seaweeds). The Department of Oceanography and Fisheries at the University of the Azores (Ponta Delgada) monitors and studies these species annually through scientific missions to the islets.

References

Notes
  1. ^ Tomaz Dentinho, João Lima & Ana Tavares (2000), p.2
  2. ^ Tomaz Dentinho, João Lima & Ana Tavares (2000), p.2
  3. ^ Tomaz Dentinho, João Lima & Ana Tavares (2000), p.2
  4. ^ Tomaz Dentinho, João Lima & Ana Tavares (2000), p.3
Sources

Wikimedia Foundation. 2010.

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