scholarly journals Les rivages des Bermudes et les formes littorales de dissolution du calcaire

2005 ◽  
Vol 2 (2) ◽  
pp. 115-137 ◽  
Author(s):  
François Taillefer
Keyword(s):  
Coral Reef ◽  
Coral Reefs ◽  
Mechanical Action ◽  
Intermediate Position ◽  
Striking Feature ◽  
Tidal Range ◽  
Intermediate Type ◽  
North East ◽  
The North

The littoral morphology of the Bermudas is an erosional morphology in limestones, the main processes being mechanical action and solution. The temperatures, in January and February, of the waters washing the Bermudas, are low enough to prevent the growing of true coral reefs. Therefore, it is not the morphology of a coral reef. The predominance of wave-cut cliffs is the most striking feature, despite the low and gently rolling topography. There are, however, other types of coasts on the islands, the mangrove being found on many sheltered shores. The writer thus opposes the sheltered shores of the sounds to the ones exposed on the southcoast, while the shores of the north and north-east coasts belong to an intermediate type. The steplike arrangement of the coastal forms of solution of the Bermudas limestones is primarily linked to the amount of the tidal range. These features are similar to those described on the shores of the warm seas, where the tide is negligible or weak. The Bermudas occupy an intermediate position between the regions where reefs are built by corals, and those, to the north, where solution, helped by other processes, occurs without compensation.

Torres Strait and the Inner Route

1977 ◽  
Vol 30 (1) ◽  
pp. 21-27
Author(s):  
J. H. S. Osborn
Keyword(s):  
Coral Reef ◽  
Great Barrier Reef ◽  
East Coast ◽  
Barrier Reef ◽  
Outer Limit ◽  
North East ◽  
The North ◽  
Torres Strait ◽  
Alternative Routes ◽  
Coral Reef System

The north-east coast of Australia is fronted by the world's longest coral reef system, which stretches in a north/south direction between latitudes 9° and 24° South. Although its outer limit is at distances of between 20 and 120 miles from the coast the enclosed waters are relatively shallow and contain many islands, detached reefs and shoals. The shipping lane between the coast and the Great Barrier Reef is known as the Inner Route. Torres Strait, its northern entrance, although extensive is shallow throughout and encumbered by reefs and islands to such an extent that only one route through it has been lit. The alternative routes are shallow or tortuous.

scholarly journals Introductory Chapter

1888 ◽  
Vol 31 ◽  
pp. xxi-lxxv
Keyword(s):  
Coral Reef ◽  
Indian Peninsula ◽  
Extreme Length ◽  
North East ◽  
The North ◽  
African Coast

The island of Socotra lies off the north-east corner of Africa, in lat. 12° 19′ to 12° 42′, and long. 53° 20′ to 54° 30′. Its extreme length from east to west is about 72 miles, and its breadth about 22 miles. From Cape Guardafui 140 miles, it is a little more distant from the Arabian coast (about 500 miles from Aden), and still further away from the Indian Peninsula. It is the most easterly elevation of land on a coral bank lying to the north-east of Africa, upon which, between it and Cape Guardafui, other islands (Abd-al-Kuri, Kal Farun, Samneh and Darzi—known commonly as The Brothers—and Saboynea) of smaller size occur. On no part of this bank is the depth of water over 200 fathoms, but between it and the African coast is a channel reaching 500 fathoms. Around Socotra is a narrow coral reef.

A distinctive new species of Xyrodromeus Lugo-Ortiz & McCafferty (Ephemeroptera: Baetidae) from Madagascar

Zootaxa ◽  
2004 ◽  
Vol 452 (1) ◽  
pp. 1 ◽  
Author(s):  
JEAN-LUC GATTOLLIAT
Keyword(s):  
New Species ◽  
Strong Relationship ◽  
Intermediate Position ◽  
Single Variable ◽  
North East ◽  
The North ◽  
Three New Species

The genus Xyrodromeus Lugo-Ortiz & McCafferty was established for Afrotropical species of Baetidae (Ephemeroptera) possessing bladelike mandibles. Recently, three new species were described from Madagascar. Xyrodromeus ambiguus n. sp. is established for larvae collected in the North and North-East of Madagascar. It possesses most of the generic features of Xyrodromeus, but differs significantly from all the previously known species by possessing two rows of denticles on the tarsal claws. This species has an intermediate position between Xyrodromeus and Dicentroptilum Wuillot & Gillies. While it may confirm the strong relationship between the two genera, it also opens the question of their validity and could suggest that all these species belong to a single variable and graded genus.

scholarly journals Benthic Oxygen and Nitrogen Exchange on a Cold-Water Coral Reef in the North-East Atlantic Ocean

2019 ◽  
Vol 6 ◽  
Author(s):  
Evert de Froe ◽  
Lorenzo Rovelli ◽  
Ronnie N. Glud ◽  
Sandra R. Maier ◽  
Gerard Duineveld ◽  
...  
Keyword(s):  
Coral Reef ◽  
Atlantic Ocean ◽  
Cold Water ◽  
East Atlantic ◽  
North East ◽  
The North ◽  
Nitrogen Exchange ◽  
Water Coral

Coral reef fish association and behaviour on the fire coralMilleporaspp. in north-east Brazil

2013 ◽  
Vol 93 (6) ◽  
pp. 1703-1711 ◽  
Author(s):  
Isabela Carolina Silva Leal ◽  
Pedro Henrique Cipresso Pereira ◽  
Maria Elisabeth de Araújo
Keyword(s):  
Coral Reef ◽  
Coral Reefs ◽  
Reef Fish ◽  
Coral Reef Fish ◽  
Complex Structure ◽  
Trophic Guilds ◽  
Agonistic Behaviour ◽  
Ecological Functions ◽  
The Past ◽  
North East

The branching structure of the coral colonies from the genusMilleporaprovides substrate, shelter, and food resources for several reef organisms, such as fish and invertebrates. The present work analysed the association and behaviour of reef fish on the fire coralMillepora alcicornisandM. brasiliensisfrom September 2010 to February 2011, on the coastal reefs of Tamandaré, north-east Brazil. A total of 473 reef fish individuals of 27 species were sighted associated with the coral colonies, mainly composed of juveniles (65%). The most frequently observed behaviours were sheltered/stationary and swimming close to the coral; however, individuals were also observed foraging and breeding amongMilleporaspp. branching colonies. The agonistic behaviour performed byStegastes fuscusindividuals was highlighted in the present study, especially againstChaetodon striatus, Diodon holacanthusandOphioblennius trinitatisindividuals.Milleporaspp. hydrocorals are ecologically important for juvenile and adult reef fish belonging to several trophic guilds. The complex structure of the coral colonies provides a wide variety of ecological functions on coral reefs (e.g. shelter, reproduction area, food and even territory). Nevertheless, the abundance of branching fire coral in Brazilian reefs have been declining over the past years; therefore, efforts must be made to protect this key habitat.

scholarly journals Study of Physical Vulnerability Mapping of the Coastal Areas of North - East Aceh

2019 ◽  
Vol 6 (4) ◽  
pp. 107
Author(s):  
Agus Sumardi ◽  
Eldina Fatimah ◽  
Nizamuddin Nizamuddin
Keyword(s):  
East Coast ◽  
Coastal Region ◽  
Vulnerability Index ◽  
Tidal Range ◽  
Coastal Vulnerability ◽  
Physical Vulnerability ◽  
North East ◽  
The North ◽  
Vulnerability Maps ◽  
Methodological Aspects

The coastal physical vulnerability study conducted in the North-East coast region of Aceh, which was focused on the calculation of the physical vulnerability index based on the Coastal Vulnerability Index (CVI) method which was integrated with the Geographic Information System (GIS) to determine the most dominant contribution to coastal vulnerability. The index is calculated based on six variables: geomorphology, coastal erosion, slope, changes in sea level, wave height and tidal range. Basically, the emphasis on methodological aspects is related to: (i) the use of GIS techniques to construct, interpolate, filter, and sample data for shoreline networks, (ii) physical vulnerability calculations using the CVI method approach, and (iii) values CVI is applied in vulnerability maps using the GIS program by providing CVI ratings to three levels, namely low, medium, and high. The results of this study indicate that the coastal physical vulnerability of the North East Aceh region is dominated by a moderate level of vulnerability of 83.61% with 51 sub-districts, and then a low vulnerability of 9.84% with 6 sub-districts, and a high vulnerability of 6.56% with 4 sub-districts out of a total of 61 Districts in 10 Regencies / Cities on the North-East coast of Aceh. According to physical conditions, each variable has the same weight, so that each variable has the same contribution to the vulnerability index of the North-East coastal region of Aceh.

scholarly journals From Citizen Science to Policy Development on the Coral Reefs of Jamaica

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
M. James C. Crabbe
Keyword(s):  
Coral Reef ◽  
Coral Reefs ◽  
Citizen Science ◽  
Environmental Protection Agency ◽  
Policy Development ◽  
Action Plan ◽  
Scientific Data ◽  
North Coast ◽  
Reef Management ◽  
The North

This paper explores the application of citizen science to help generation of scientific data and capacity-building, and so underpin scientific ideas and policy development in the area of coral reef management, on the coral reefs of Jamaica. From 2000 to 2008, ninety Earthwatch volunteers were trained in coral reef data acquisition and analysis and made over 6,000 measurements on fringing reef sites along the north coast of Jamaica. Their work showed that while recruitment of small corals is returning after the major bleaching event of 2005, larger corals are not necessarily so resilient and so need careful management if the reefs are to survive such major extreme events. These findings were used in the development of an action plan for Jamaican coral reefs, presented to the Jamaican National Environmental Protection Agency. It was agreed that a number of themes and tactics need to be implemented in order to facilitate coral reef conservation in the Caribbean. The use of volunteers and citizen scientists from both developed and developing countries can help in forging links which can assist in data collection and analysis and, ultimately, in ecosystem management and policy development.

scholarly journals Status Terkini Tutupan Terumbu Karang di Perairan Dangkal Pulau Bedil, Desa Labuan Bajo, Kabupaten Sumbawa, NTB

2021 ◽  
pp. 243-253
Author(s):  
Mahardika Rizqi Himawan ◽  
Eni Hidayati ◽  
Nurliah Buhari ◽  
Sitti Hilyana ◽  
Maulita Syahdina
Keyword(s):  
Coral Reef ◽  
Coral Reefs ◽  
Small Island ◽  
Percent Cover ◽  
Coral Mortality ◽  
Dead Coral ◽  
The North ◽  
Mortality Index ◽  
Coral Reef Ecosystems ◽  
Index Value

Bedil Island is included in the Keramat, Bedil, and Temudong Small Island Park (TPK), which was approved by the Regent of Sumbawa. Administratively, this island is included in the Labuan Bajo Village area, Sumbawa, NTB. There is the existence of coral reef ecosystems in these waters that form a reef flat and reef slope profile, that stretches to the southwest and northeast. By its designation as a small island park, the coral reefs in Bedil Island are used as an underwater tourism object. This study aims to determine the current condition of coral reef cover in the waters around Bedil Island, especially in the eastern and southern parts of the island. Coral reefs in the north and west area are limited and there is the existence of seagrass beds. The line intercept transect method is carried out by spreading the roll meter as far as 50 meters on the east and south sides of the island with a depth of 2-3 meters. The coral lifeform that is tangent with the roll meter is then recorded and then analyzed for the average percent cover, clustering status, and coral mortality index. Coral reefs in the eastern and southern parts of Bedil Island are classified as very good/excellent because they have a percent cover value above 75%. In addition, the coral mortality index value is also relatively small which indicates that the corals are living well. Clearwater conditions and locations far from human settlements are thought to be factors that support coral survival. However, the presence of dead coral algae and rubble still indicates a threat of damage even though the value is small. Algae life on the surface of dead coral also indicates that the coral has been dead for a long time. 

scholarly journals DIVERSITY OF ECHINODERMS (ECHINODERMATA) IN THE NORTH EASTERN ISLANDS, VIETNAM

2018 ◽  
Vol 18 (3) ◽  
pp. 296-303
Author(s):  
Do Cong Thung ◽  
Dao Minh Dong
Keyword(s):  
Coral Reef ◽  
Coral Reefs ◽  
Species Number ◽  
Sandy Bottom ◽  
Species Numbers ◽  
Number Of Species ◽  
The North ◽  
North Eastern ◽  
Long Bay ◽  
Quang Ninh

41 species have been identified, belonging to 29 genera, 18 families, 10 orders and 5 classes of Echinoderms in Northeast islands, from Mong Cai (Quang Ninh) to Do Son (Hai Phong). Compared to previous publications, 15 species were first identified in the Tonkin Gulf. The diversity of species numbers shows that Oreasteridae and Holothuriidae have the highest number of species (5 species/family), similarly the genus Holothuri has the highest species number (5 species). Ha Long Bay - Cat Ba has 33 species; Co To - Thanh Lan has 24 species and Bai Tu Long has 25 species. Echinoderms live in three habitats: Sand, coral, reef. The highest number of species is living in the sandy bottom and coral reefs, 39% and the lowest number only about 10% in coral reefs and reef. Van Boi, Van Ha, Da Den, Bac Van, Hong Van have high density of Echinoderms, potentially becoming marine medicine yards.

Ras al Khaimah: further archaeological discoveries

Antiquity ◽  
1976 ◽  
Vol 50 (200) ◽  
pp. 216-222
Author(s):  
Beatrice De Cardi
Keyword(s):  
United Arab Emirates ◽  
The State ◽  
Focused Attention ◽  
North East ◽  
The North ◽  
History Of ◽  
The City

Ras a1 Khaimah is the most northerly of the seven states comprising the United Arab Emirates and its Ruler, H. H. Sheikh Saqr bin Mohammad al-Qasimi, is keenly interested in the history of the state and its people. Survey carried out there jointly with Dr D. B. Doe in 1968 had focused attention on the site of JuIfar which lies just north of the present town of Ras a1 Khaimah (de Cardi, 1971, 230-2). Julfar was in existence in Abbasid times and its importance as an entrep6t during the sixteenth and seventeenth centuries-the Portuguese Period-is reflected by the quantity and variety of imported wares to be found among the ruins of the city. Most of the sites discovered during the survey dated from that period but a group of cairns near Ghalilah and some long gabled graves in the Shimal area to the north-east of the date-groves behind Ras a1 Khaimah (map, FIG. I) clearly represented a more distant past.

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