scholarly journals A group of razorfish (Aeoliscus strigatus) follows the surge along the reef edge at Nusa Lembongan, Indonesia. These planktonic feeders are oddly shaped, suck minute crustaceans through a tube-like mouth while feeding, and rarely swim in a horizontal body

Ethology ◽  
2013 ◽  
Vol 119 (11) ◽  
pp. i-i
Keyword(s):  
Reef Edge

FORMATION OF A SANDY BEACH DUE TO SAND SUPPLY FROM VICINITY OF REEF EDGE

2019 ◽  
Vol 75 (2) ◽  
pp. I_623-I_628
Author(s):  
Takaaki UDA ◽  
Tatsuyuki IGARASHI ◽  
Yasuhiro OOKI
Keyword(s):  
Sandy Beach ◽  
Sand Supply ◽  
Reef Edge

Spatial distribution of chaetodontid fish in coral reefs of the Ryukyu Islands, southern Japan

1999 ◽  
Vol 79 (4) ◽  
pp. 725-735 ◽  
Author(s):  
L. Cadoret ◽  
M. Adjeroud ◽  
M. Tsuchiya
Keyword(s):  
Species Richness ◽  
Coral Reefs ◽  
Reef Slope ◽  
Data Matrix ◽  
Ryukyu Islands ◽  
Southern Japan ◽  
The Ryukyu Islands ◽  
The World ◽  
Species Richness And Abundance ◽  
Reef Edge

The spatial patterns of butterflyfish assemblages (Chaetodontidae) were examined within and between five islands of the Ryukyu Archipelago, southern Japan. Despite being the northernmost reef communities in the world and despite the severe natural and human-induced disturbances that have affected them since the 1970s, the coral reefs of the Ryukyu Islands have one of the most diversified assemblages of chaetodontids in the world. A total of 30 species were identified, and species richness per island ranged from 20 to 25 species. On each of the 45 stations prospected, between four and 17 species were recorded, and between 0.75 and 21.75 ind 250 m−2 were counted. Variation in species composition, species richness and abundance between islands was less pronounced than the variation within islands, where assemblages of the major reef environments (i.e. the reef flat, the reef edge, and the reef slope) were distinguished. The highest species richness and abundance were found on the reef slope and the reef edge. Canonical correspondence analysis revealed that depth, substrate complexity, and live coral cover influenced the distribution of chaetodontid fishes. These factors accounted for 20% of the variation in the species data matrix.

Growth, sexual dimorphism, and population biology of the olive sea snake, Aipysurus laevis, on the Great Barrier Reef of Australia

2000 ◽  
Vol 21 (3) ◽  
pp. 289-300 ◽  
Author(s):  
Glen Burns ◽  
Harold Heatwole
Keyword(s):  
Sexual Dimorphism ◽  
Great Barrier Reef ◽  
Population Biology ◽  
Sexual Maturity ◽  
Reproductive Behaviour ◽  
Barrier Reef ◽  
Sea Snake ◽  
Sea Snakes ◽  
Equivalent Length ◽  
Reef Edge

AbstractThe olive sea snake, Aipysurus laevis (Lacépède) grows at a rate of 0.22-0.95 cm/month, with young animals growing faster than older ones. Males reach sexual maturity in their third year and females in their fourth or fifth year. There is sexual dimorphism in size, with females larger than males; at snout-vent lengths greater than 80 cm, females are heavier than males of equivalent length. Small snakes were uncommon. Apparent sexratio favours males in winter but moves toward equality or even a preponderance of females in summer, probably reflecting changes in reproductive behaviour. Numbers of snakes are approximately 0.70-0.86 snakes per metre of reef edge. Olive sea snakes live to about 15 years or older.

Fragmentation and genotypic diversity of the scleractinian coral Montipora capitata in Kaneohe Bay, Hawaii

2008 ◽  
Vol 89 (1) ◽  
pp. 101-107 ◽  
Author(s):  
A. Nishikawa ◽  
R.A. Kinzie ◽  
K. Sakai
Keyword(s):  
Scleractinian Coral ◽  
Genotypic Diversity ◽  
The Other ◽  
Allozyme Electrophoresis ◽  
Clonal Structure ◽  
Montipora Capitata ◽  
Kaneohe Bay ◽  
Field Investigations ◽  
Sheltered Habitat ◽  
Reef Edge

The fragmentation and genotypic diversity of Montipora capitata was determined in Kaneohe Bay, Hawaii, using field investigations and allozyme electrophoresis. Two stations were established in the Bay, one in the centre (exposed reef edge, EXPO) and the other at the south end (sheltered lagoonal reef, SHEL). Although the number and mean per cent cover of attached colonies did not differ significantly between the two habitats, number and cover of unattached colonies (fragments) were significantly higher at the sheltered habitat. Thirty-seven genotypes were detected in 176 samples using two or three enzyme loci. Although mean genet number did not differ significantly between the two habitats (mean±SE, 8.2±1.2 and 12.2±1.7 in exposed and sheltered reefs, respectively), lower genetic diversity was detected at SHEL (mean NG:N±SE, 0.75±0.08 and 0.50±0.06 for EXPO and SHEL, respectively). There was no evidence of strong clonal structure, i.e. many colonies, but few genets. Sexually produced new genets may account for the high genotypic diversity in M. capitata at these two habitats.

An Experimental Study of Wave-Induced Set-Up Over a Horizontal Reef With an Idealized Ridge

2009 ◽  
Author(s):  
Yu Yao ◽  
Edmond Y. M. Lo ◽  
Zhenhua Huang ◽  
Stephen G. Monismith
Keyword(s):  
Water Level ◽  
Wave Breaking ◽  
Transformation Process ◽  
Wave Transformation ◽  
Reflected Waves ◽  
Wave Flume ◽  
Breaking Mechanism ◽  
Set Up ◽  
Wave Induced ◽  
Reef Edge

Wave action has been the primary focus of near-shore hydrodynamic studies over decades. The wave-induced set-up due to wave breaking is one of the important factors to consider in determining both water level and mass transport above the reef-top, which has ecological as well as engineering significance. Previous investigations into reef hydrodynamics (including laboratory experiments, field investigations, theoretical analysis and numerical simulations) focused mainly on wave-induced set-up on reefs with a horizontal reef-top (Gourlay, 1996. J. Coastal Eng. 27:161–193). It has been observed that a ridge (reef crest) may be present at the reef edge, but so far we are not aware of any published studies on the effects of this type of ridge on the wave-induced set-up over the reef-top. To understand the role of the ridge in wave-breaking mechanism and wave-induced set-up over the reef, a series of experiments were carried out in a wave flume of 36m long and 0.55m wide, with idealized reef-ridge models being installed at the reef edge to simulate fringing reefs with rectangle ridges. The surface elevations at four locations over the reef were measured with Ultralab sensors (General Acoustics), revealing the variation of wave-induced set-up along the reef. Experimental results are reported for two water depths and eighteen regular wave conditions. Also discussed are the effects of the ridge width on the wave-induced set-up. The focus of this paper will be given to the comparison of wave-induced set-ups with and without the rectangular ridges. Preliminary analysis shows that the ridge controls the water level above the reef-top in a way similar to that a broad crest weir controls the water level in open channel flows. Furthermore, the presence of the ridge is found to alter significantly the wave transformation process near the reef edge, especially the strength of the reflected waves and the locations of breakers. Experiments also show that the wave-induced set-up over reef-top with a ridge is generally much larger than that without a ridge. Finally, an attempt is made to introduce a new dimensionless parameter in order to take the ridge configuration into consideration and achieve a better agreement between experiments and predictions when ridges are present.

THE SIGNIFICANCE OF DIFFRACTION IN THE INVESTIGATION OF FAULTS

Geophysics ◽  
1952 ◽  
Vol 17 (4) ◽  
pp. 843-858 ◽  
Author(s):  
Theodor Krey
Keyword(s):  
Seismic Reflection ◽  
Seismic Waves ◽  
Sudden Change ◽  
Seismic Profile ◽  
Acute Angle ◽  
Oscillation Pattern ◽  
Reef Edge

Seismic reflection records taken across faults frequently show an overlapping of reflections from the displaced blocks. It is demonstrated that diffraction of seismic waves is a cause and the effect may be used in interpretation. Overlapping is increased if a seismic profile crosses a fault at an acute angle. Plotted dips will be inaccurate unless diffraction is taken into account. Further, the diffraction oscillation pattern will also be obtained if a reflection horizon terminates for a reason other than faulting, for example, at a wedgeout or reef edge, or at a sudden change of facies. The facts developed are demonstrated by practical examples in which attention is directed to the approximations involved in plotting the boundaries of discontinuities.

scholarly journals Qualitative Modelling of Gold Mine Impacts on Lihir Island's Socioeconomic System and Reef-Edge Fish Community

2007 ◽  
Vol 41 (2) ◽  
pp. 555-562 ◽  
Author(s):  
Jeffrey M. Dambacher ◽  
David T. Brewer ◽  
Darren M. Dennis ◽  
Martha Macintyre ◽  
Simon Foale
Keyword(s):  
Fish Community ◽  
Gold Mine ◽  
Qualitative Modelling ◽  
Socioeconomic System ◽  
Reef Edge

Exploring for dolomitized Slave Point carbonates in northeastern British Columbia

Geophysics ◽  
1989 ◽  
Vol 54 (7) ◽  
pp. 806-814 ◽  
Author(s):  
Graeme G. Phipps
Keyword(s):  
British Columbia ◽  
Seismic Data ◽  
Narrow Band ◽  
Salt Water ◽  
Barrier Reef ◽  
Reflection Seismic ◽  
Salt Waters ◽  
Geologic Model ◽  
Gas Fields ◽  
Reef Edge

In northeastern British Columbia, a number of significant gas fields have been discovered in dolomitized Slave Point carbonates located along the edge of the mid‐Devonian barrier‐reef system. Reflection seismic techniques have been used extensively in exploring for these fields. A common exploration practice has been to detect the reef edge on seismic data and then to drill on isochron thins and structural highs close to this edge. The remaining reserves, however, are proving more difficult to find, and this exploration technique does not always guarantee that the Slave Point formation is dolomitized at this location. As with many other complex play types, combining geologic concepts with geophysical exploration techniques can improve the explorationist’s success ratio. In this example, a geologic model (the Dorag dolomitization model) provides a possible explanation for the localization of the Slave Point dolomites. In this model dolomitizing solutions are created by mixing fresh, phreatic water with salt water. This condition could occur if porous reefal Slave Point carbonates were exposed to fresh‐water infiltrations adjacent to open‐marine conditions. The edges of the mid‐Devonian barrier reef and the edge of the Keg River embayments were areas that could have met these requirements. Thus the optimum condition for dolomitization should occur slightly basinward of the reef edge in the zone of possible mixing of fresh and salt waters. To increase the chance of encountering a potentially narrow band of dolomitized Slave Point reservoirs, exploration wells should be positioned on the edge of the carbonate reef slightly basinward of the isochron thin. An exploration example from a Keg River embayment area illustrates and supports this exploration concept.

Low density populations of anemonefish with low replenishment rates on a reef edge with anthropogenic impacts

2019 ◽  
Vol 102 (1) ◽  
pp. 41-54 ◽  
Author(s):  
Kina Hayashi ◽  
Katsunori Tachihara ◽  
James Davis Reimer
Keyword(s):  
Anthropogenic Impacts ◽  
Low Density ◽  
Reef Edge

scholarly journals THE SUCCESSFUL TRANSPLANTATION OF ACROPORA MICROPHTHALMA AT BARRANG LOMPO REEF EDGE< SOUTH SULAWESI

2008 ◽  
Vol 30 ◽  
pp. 21-25 ◽  
Author(s):  
A. R. Yuliantri ◽  
W. Moka ◽  
J. Jompa ◽  
M. Litaay
Keyword(s):  
Survival Rate ◽  
Coral Reefs ◽  
Growth Rates ◽  
Dead Coral ◽  
South Sulawesi ◽  
Successful Transplantation ◽  
Survival And Growth ◽  
North And South ◽  
Reef Edge

Research on transplantation of Acropora microphthalma was conducted at Barrang Lompo Island reef edge of South Sulawesi from September to December 2002. The aim of this research was to know the successful rate of several coral transplantation methods for rehabilitation of coral reefs, covering the survival and growth rates. The methods used were framework earthenware (FE), iron stake (IS), dead coral tying (DCT), where the mother colony (MC) was used as control. These transplantation techniques were applied at five meter depth in two stations, north and south sites of the island. The survival rate for each method FE, IS, DCT and MC at the northern station was 85.71; 42.86; 85.71; 57.14%, while for southern station was 85.71; 85.71; 71.43 and 85.71%, respectively. The growth rates observed for each method at the first station were 2.18; 2.02; 1.40; 1.05 cm, and for the second station were 2.56; 2.21; 1.61; 1.04 cm, respectively.

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