The Dollabarat Reef is a shoal situated 5 km (3 nautical miles) south-southeast of the Formigas Islets on the Formigas Bank in the Azores archipelago.
| Dollabarat | |
|---|---|
 | |
| Etymology | Pierre Dollabarat, captain who discovered the reef by accident on 7 March 1788 |
| Location | |
| Country | Portugal |
| Autonomous region | Azores |
| Islands | Eastern Group |
| Basin features | |
| River system | Azores Plateau |
| Designation | |
| Official name | Ilhéus das Formigas e Recife Dollabarat |
| Designated | 16 June 2008 |
| Reference no. | 1804[1] |
History
editThe reef is named after Pierre Dollabarats, Basque captain of the ship Maria de Sebourre, who accidentally discovered the reef when his small boat wrecked on it on 7 March 1788.
Since 16 June 2008, Dollabarat Reef and the neighboring Formigas Islets have been recognized as a Ramsar Convention wetland under the name Ilhéus das Formigas e Recife Dollabarat (reference number 1804).[2]
Geography
editThe Dollabarat Reef is part of the Formigas Islets Nature Reserve which covers 35.42 square kilometres (13.68 sq mi).[3] Around the Formigas Reserve, including the Dollabarat, sea cliffs fall rapidly between 50–70 metres (160–230 ft), although gently to the north and south. The gradient around the Dollabarat is less accentuated.[3]
The highest point is 3 metres (9.8 ft) below sea level. Dollabarat Reef is one of the higher parts of the Formigas Bank, a seamount with similar volcanic origins as the Azores islands. The reef was formed from rocks emerging from volcanic activity in submarine volcanoes and deeper spaces composed 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
editThe strong currents, deep waters, and presence of sharks make diving difficult for those not familiar with open-ocean diving. The sub-tidal zone is a shelter for many fish species, and the abundance of black coral located about 15 metres (49 ft) deep in the eastern part of the reef has resulted in a small reef habitat.[4]
There is a large abundance of sea animals in the vicinity. In addition to species of sharks, other aquatic animals such as sea chub, trigger fish, mantas, turtles and dolphins have been observed in the waters around Dollabarat, including the Atlantic goliath grouper (usually found in depths between 10–40 m). The floor of the seamount is generally covered by a dense layer of seaweed, dominated by the Cystoseira species, a seaweed found in deeper areas. In shallower depths less than 50 metres (160 ft) 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 reef and surrounding islets.
References
edit- Notes
- ^ "Ilhéus das Formigas e Recife Dollabarat". Ramsar Sites Information Service. Retrieved 25 April 2018.
- ^ "Ilhéus das Formigas e Recife Dollabarat". Ramsar Sites Information Service. 16 June 2008. Retrieved 25 April 2018.
- ^ a b c Tomaz Dentinho, João Lima & Ana Tavares (2000), p.2
- ^ Tomaz Dentinho, João Lima & Ana Tavares (2000), p.3
- Sources
- WWF, ed. (2010), The Formigas Bank - A Potential MPA: Justification for the Potential Selection of the Formigas Bank as an Offshore Marine Protected Area (PDF), World Wildlife Fund, archived from the original (PDF) on 26 September 2011, retrieved 17 July 2011
- Dentinho, Tomaz; Lima, João; Tavares, Ana (2000), Avaliação do Contecto Sócio-Económico do Sítio de Interesse Comunitário Ilhéus das Formigas e Recife Dolabarat (PDF) (in Portuguese), Ponta Delgada (Azores), Portugal: Núcleo Temático SICs do Projecto MARÉ, retrieved 17 July 2011