著者
Naoko NAMIZAKI Hiroya YAMANO Rintaro SUZUKI Kenji OOHORI Hitoshi ONAGA Tamiko KISHIMOTO Teppei SAGAWA Yoshiko MACHIDA Shigeki YASUMURA Takanori SATOH Takashi SHIGIYA Tsuyoshi SHIBATA Megumu TSUCHIKAWA Yasuaki MIYAMOTO Kyoko HARUKAWA Koichi HIRATE Koji FURUSE Kenichi HOKOYAMA Yasushi YAMANAKA Toru WAGATSUMA
出版者
日本サンゴ礁学会
雑誌
Galaxea, Journal of Coral Reef Studies (ISSN:18830838)
巻号頁・発行日
vol.15, no.Supplement, pp.391-395, 2013 (Released:2014-06-25)
参考文献数
10

The Sango (Coral) Map Project began in 2008, an International Year of the Reef, and continued for two years. It is a monitoring program that allowed for easy participation via a web-based system that collected information on coral occurrence from various groups of people (e.g. divers, snorkelers, tourists, environmental educators, and researchers) with the aim of clarifying the current status of coral reefs in Japan. Participants simply submitted occurrences and location information with photographs of coral formations they encountered. The results are presented on the web using the Google Map API. Over the two-year period, 148 participants provided information on coral occurrence, and 367 data points were collected. Collaboration was developed with other activities including nature tours and diving programs. Data from the project have been used to validate national coral-reef distribution maps and have been published as a scientific paper. The project owes its success to the engagement with a wide range of networks and stakeholders and to the simplicity of the method. We hope that this project will be a first step towards encouraging people to participate in other monitoring programs such as ReefCheck. Citizen monitoring programs are a useful and important method for establishing collaboration between diverse stakeholders.
著者
Michael P. JANES
出版者
日本サンゴ礁学会
雑誌
Galaxea, Journal of Coral Reef Studies (ISSN:18830838)
巻号頁・発行日
vol.15, no.Supplement, pp.195-200, 2013 (Released:2014-06-25)
参考文献数
29

The Xeniidae are a major component of benthic coral reef communities in Lembeh, Indonesia. A two-week survey of the xeniids from this region was conducted. Scuba collections were carried out to a depth of 25 meters. A total of 48 samples were examined, encompassing a variety of species found in Lembeh Strait. Representatives of the genera Anthelia, Cespitularia, Heteroxenia, Sansibia, Sympodium, and Xenia were recorded using microscopic analysis. Visual estimates were made of the underwater abundance and distribution of these genera. Three habitats containing xeniids were identified. Sand slopes, which were limited to the genera Anthelia, and Xenia. Hard substratum patch reefs supported the greatest diversity, which included communities of Anthelia, Cespitularia, Heteroxenia, Sansibia, Sympodium, and Xenia. The genera Cespitularia, Heteroxenia and Xenia were found to colonize reef walls. Only one colony of Sansibia and one colony of Sympodium were recorded in this survey. Abundant assemblages of Xenia were found to occur at depths of 3-25 meters, primarily on sand slopes. Interestingly, most colonies of Cespitularia and Heteroxenia were observed below 10 meters on both patch reefs and reef walls.
著者
Patrick C. CABAITAN Hiromi YAMAMOTO Kazuhiko SAKAI
出版者
日本サンゴ礁学会
雑誌
Galaxea, Journal of Coral Reef Studies (ISSN:18830838)
巻号頁・発行日
vol.14, no.1, pp.27-40, 2012 (Released:2013-03-22)
参考文献数
33
被引用文献数
1 or 0

Coral communities at nine sites off the coast of Motobu, Okinawa, were examined 6 and 12 years after a 1998 mass coral bleaching event caused by anomalous seawater temperatures. Overall, mean coral coverage increased from 17% in 2006 to 28% in 2010 at these sites, although these percentages were lower than the coral coverage at a nearby reef at Sesoko Island. Some of the corals that had not recovered (the “losers”) at the Sesoko reef were found at some sites in the present study. Dominant coral taxa differed among sites, probably because of differences in the environmental conditions at the sites, e.g., the so-called massive-type coral Porites dominated at a protected site near a river, while branching-type Acropora was dominant at exposed sites. Acropora was one of the prominent short-term losers, but contributed significantly to coral coverage increases due to its fast growth at some exposed sites. Adjacent reefs, which may share similar environmental conditions, also showed some variability, possibly due to processes such as coral recruitment and post settlement survival, which acted on a smaller spatial scale. Multivariate analyses such as multidimensional scaling were more sensitive than univariate analyses. Overall, recruitment was low, especially at sites with high coral coverage, which implies that remnant corals may have contributed to the recovery of these reefs. Coral communities in this area are recovering and there has been no apparent shift to algae-dominated communities. The recovery of coral communities appears to be related to the life history traits of corals and environmental conditions.
著者
Janelle V. EAGLE Andrew H. BAIRD Geoffrey P. JONES Michael J. KINGSFORD
出版者
日本サンゴ礁学会
雑誌
Galaxea, Journal of Coral Reef Studies (ISSN:18830838)
巻号頁・発行日
vol.14, no.1, pp.5-22, 2012 (Released:2013-03-22)
参考文献数
86
被引用文献数
2 or 0

On coral reefs, sites that receive consistently high levels of recruitment relevant to other sites (“recruitment hotspots”) may be crucial to the persistence of populations. However, few studies of coral recruitment have the necessary replication in space and time required to detect recruitment hotspots. The aim of this study was to detect recruitment hotspots at One Tree Reef (southern Great Barrier Reef) and to explore associations between hotspots, hydrodynamics, adult abundance and reef benthos. Recruitment hotspots were detected on the reef slope and in the lagoon. Almost all hotspots were located on the leeward side of the reef, however, there was little congruence among hotspots for different families of coral recruits. Recruitment hotspots in some taxa in some habitats were correlated with water flow or adult abun-dance. A clear recruitment hotspot for two families (Pocilloporidae and Poritidae) in the lagoon had medium levels of water flow (∼4 cm s-1), but there was no re-lationship with water flow on the slope. In experimental aquaria, Acropora nasuta settlement was six to 10 times greater under low (2.1 cm s-1) compared to medium water flow (4.6 cm s-1). Abundance of pocilloporid and poritid, but not acroporid, recruits at each site was often correlated with adult cover indicating either aggregative settlement or limited dispersal. Recruitment hotspots are likely to be both sources and sinks for some taxa, and therefore identifying and protecting hotspots should be a high priority in marine reserve design.
著者
Hajime KAYANNE Chuki HONGO Ken OKAJI Yoichi IDE Takeshi HAYASHIBARA Hidekazu YAMAMOTO Nobuo MIKAMI Kiyoshi ONODERA Takaaki OOTSUBO Hiroyuki TAKANO Makoto TONEGAWA Shogo MARUYAMA
出版者
日本サンゴ礁学会
雑誌
Galaxea, Journal of Coral Reef Studies (ISSN:18830838)
巻号頁・発行日
vol.14, no.1, pp.73-95, 2012 (Released:2013-02-04)
参考文献数
37
被引用文献数
1 or 1

Ninety-three coral species have been identified at Okinotorishima (Okinotori Island), an isolated table reef located in the center of the Philippine Sea. The species composition of the island is similar to that of other islands in the northwestern Pacific, but the number of species is small in comparison with surrounding islands. The coral fauna at the island is characterized by a unique species composition that is independent of the Ryukyu Islands, mainland Japan, Palau, and the Mariana Islands. No endemic species were found, but the dominant Acropora species (A. aculeus, A. sp. aff. divaricata, and A. globiceps) were morphologically different from corresponding species at the Ryukyu Islands. The relatively low species diversity at the island despite the close proximity to an area of high diversity is explained by its small habitat diversity and isolation from other islands. The island is located in a subtropical gyre and is isolated from major currents. Thus, only coral larvae with a long competency period (as long as 70 days) can settle at the island from surrounding islands. This unique species composition seems to have been maintained for at least the last 7600 years, since the last stage of sea level rise in the post-glacial period (Holocene).
著者
J.E.N. VERON Lyndon M. DEVANTIER Emre TURAK Alison L. GREEN Stuart KININMONTH Mary STAFFORD-SMITH Nate PETERSON
出版者
日本サンゴ礁学会
雑誌
Galaxea, Journal of Coral Reef Studies (ISSN:18830838)
巻号頁・発行日
vol.11, no.2, pp.91-100, 2009 (Released:2010-08-07)
参考文献数
49
被引用文献数
114 or 0

Spatial analyses of coral distributions at species level delineate the Coral Triangle and provide new insights into patterns of diversity and endemism around the globe. This study shows that the Coral Triangle, an area extending from the Philippines to the Solomon Islands, has 605 zooxanthellate corals including 15 regional endemics. This amounts to 76% of the world's total species complement, giving this province the world's highest conservation priority. Within the Coral Triangle, highest richness resides in the Bird's Head Peninsula of Indonesian Papua which hosts 574 species, with individual reefs supporting up to 280 species ha-1. Reasons for the exceptional richness of the Coral Triangle include the geological setting, physical environment and an array of ecological processes. These findings, supported by parallel distributions of reef fishes and other taxa, provide a clear scientific justification for the Coral Triangle Initiative, arguably one of the world's most significant reef conservation undertakings.