scholarly journals Community structure and abundance of copepods in summer on a fringing coral reef off Ishigaki Island, Ryukyu Islands, Japan

2015 ◽  
Vol 10 (4) ◽  
pp. 225-232 ◽  
Author(s):  
Kouki Fukuoka ◽  
Toru Shimoda ◽  
Kazuo Abe
Keyword(s):  
Community Structure ◽  
Coral Reef ◽  
Ryukyu Islands ◽  
Ishigaki Island

Influence of wave energy on Holocene coral reef development: an example from Ishigaki Island, Ryukyu Islands, Japan

2003 ◽  
Vol 159 (1-2) ◽  
pp. 27-41 ◽  
Author(s):  
Hiroya Yamano ◽  
Osamu Abe ◽  
Eiji Matsumoto ◽  
Hajime Kayanne ◽  
Nobuyuki Yonekura ◽  
...  
Keyword(s):  
Coral Reef ◽  
Wave Energy ◽  
Ryukyu Islands ◽  
Reef Development ◽  
Ishigaki Island

scholarly journals Coral Reef Evolution at the Leeward Side of Ishigaki Island, Southwest Japan

Radiocarbon ◽  
2001 ◽  
Vol 43 (2B) ◽  
pp. 899-908 ◽  
Author(s):  
Hiroya Yamano ◽  
Osamu Abe ◽  
Hiroyuki Kitagawa ◽  
Etsuko Niu ◽  
Toshio Nakamura
Keyword(s):  
Coral Reef ◽  
Coral Reefs ◽  
Leeward Side ◽  
Ryukyu Islands ◽  
Accumulation Rates ◽  
Southwest Japan ◽  
Reef Facies ◽  
Carbon 14 ◽  
Ishigaki Island ◽  
Reef Evolution

In comparison with windward coral reefs, the facies and evolution of leeward coral reefs has been discussed to a lesser extent. By accelerator mass spectrometry (AMS) carbon-14 dating of coral specimens collected from the trench excavated across a modern coral reef during a fishery port repair, we revealed the internal facies and Holocene evolution of a leeward reef in Ishigaki Island, Ryukyu Islands, southwest Japan. The reef facies can be split into three facies: the tabular Acropora framework facies, the tabular Acropora reworked facies, and the unconsolidated bioclast facies. The tabular Acropora reworked facies first formed a ridge by 3500 BR Then, the tabular Acropora framework facies grew both upward and seaward. The accumulation rates of the tabular Acropora framework facies ranged from 2.2 to 8.3 m/ka. Thus, the reef framework facies and accumulation rates of this leeward reef is similar to those of windward reefs, although the age of the reef top is younger than that of windward reefs.

Supplementary descriptions of Pergalumna amamiensis Aoki, 1984 (Acariformes, Galumnoidea) from Ryukyu Islands

Zootaxa ◽  
2019 ◽  
Vol 4647 (1) ◽  
pp. 378-384
Author(s):  
WATARU HAGINO ◽  
SATOSHI SHIMANO
Keyword(s):  
Body Length ◽  
Morphological Traits ◽  
Granular Structure ◽  
Surface Pattern ◽  
Ryukyu Islands ◽  
Body Width ◽  
Okinawa Island ◽  
Ishigaki Island ◽  
Circular Surface ◽  
Median Pore

A species of oribatid mites, Pergalumna amamiensis was collected from Amami-Ohshima Island, Ishigaki Island, and Okinawa Island, Southwestern Japan. The specimens were studied in detail, and supplementary descriptions are provided; these include features of the rostrum, the subcapitulum and the surface pattern of pteromorphs. The main morphological traits for this species are summarized as follows; body length 519–570 μm, body width 363–410 μm, rostral tip pointed, sensillus with a long stalk covered by minute barbs, porose areas Aa bulbous, porose areas A1, A2, and A3 circular, surface of pteromorphs ornamented by fine granular structure and dense wrinkles, fine granular structure on prodorsum, subcapitulum, genital plates and anal plates, median pore on the notogaster represented as single pore. 

Bathymetry, biota and sediments on the Hirota Reef, Tane-ga-shima ? the northernmost coral reef in the Ryukyu Islands

Island Arc ◽  
2006 ◽  
Vol 15 (4) ◽  
pp. 407-419 ◽  
Author(s):  
Emiko Ikeda ◽  
Yasufumi Iryu ◽  
Kaoru Sugihara ◽  
Hideo Ohba ◽  
Tsutomu Yamada
Keyword(s):  
Coral Reef ◽  
Ryukyu Islands ◽  
The Ryukyu Islands

scholarly journals Transects, quadrats, or points? What is the best combination to get a precise estimation of a coral community?

2019 ◽  
Author(s):  
Luis M. Montilla ◽  
Emy Miyazawa ◽  
Alfredo Ascanio ◽  
María López-Hernández ◽  
Gloria Mariño-Briceño ◽  
...  
Keyword(s):  
Community Structure ◽  
Coral Reef ◽  
Effect Size ◽  
Standard Error ◽  
Scleractinian Coral ◽  
Statistical Power ◽  
Coral Community ◽  
Sampling Effort ◽  
Precise Estimation

ABSTRACTThe characteristics of coral reef sampling and monitoring are highly variable, with numbers of units and sampling effort varying from one study to another. Numerous works have been carried out to determine an appropriate effect size through statistical power, however, always from a univariate perspective. In this work, we used the pseudo multivariate dissimilarity-based standard error (MultSE) approach to assess the precision of sampling scleractinian coral assemblages in reefs of Venezuela between 2017 and 2018 when using different combinations of number of transects, quadrats and points. For this, the MultSE of 36 sites previously sampled was estimated, using four 30m-transects with 15 photo-quadrats each and 25 random points per quadrat. We obtained that the MultSE was highly variable between sites and is not correlated with the univariate standard error nor with the richness of species. Then, a subset of sites was re-annotated using 100 uniformly distributed points, which allowed the simulation of different numbers of transects per site, quadrats per transect and points per quadrat using resampling techniques. The magnitude of the MultSE stabilized by adding more transects, however, adding more quadrats or points does not improve the estimate. For this case study, the error was reduced by half when using 10 transects, 10 quadrats per transect and 25 points per quadrat. We recommend the use of MultSE in reef monitoring programs, in particular when conducting pilot surveys to optimize the estimation of the community structure.

Localized Impacts of Hurricane Irma on Diadema antillarum and Coral Reef Community Structure

2019 ◽  
Vol 43 (5) ◽  
pp. 1133-1143
Author(s):  
Julia N. Kobelt ◽  
William C. Sharp ◽  
Travis N. Miles ◽  
Colette J. Feehan
Keyword(s):  
Community Structure ◽  
Coral Reef ◽  
Diadema Antillarum ◽  
Coral Reef Community ◽  
Reef Community ◽  
Hurricane Irma
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