Dongsha Soft Coral Workshop
2016 Dongsha Soft Coral Workshop
WE MADE IT!!
All of the participants were frustrated by all those sclerites and polyps in these three days.
Now, we are ready to be a professional taxonomist of soft corals in the future
Thanks for Dr. Caterine McFadden, Dr. Yehuda Benayahu and Dr. Philip Alderslade come to teach us.
Thanks for Dr. Dai, Chang Feng, Dr. Liu, Shang-Yin and Dr. Soong, Keryea and all other participants !!
We were having a wonderful workshop these days!!
簡 介 About Dongsha Atoll Research Station-Marine Station in north South China Sea
東沙環礁地處南中國海(簡稱南海)北部，與最近的陸塊距離超過250 公里，與高雄港距離超過400 公里，遺世獨立，其特殊的地理環境造就了值得深入探討的科學議題相當廣泛，其多元的環境簡述如下:
Dongsha Atoll locates on the northern part of the South China Sea. The shortest distance to mainland of the remote atoll is over 250km, and is over 400km to Kaohsiung, Taiwan. Dongsha Atoll is a place with various scientific interests because of the unique geographical environments: :
The Dongsha Atoll Research Station (DARS), founded in 2012, is located on Dongsha Island; it provides variety of research facilities to visiting scientists. DARS is like a boat staying in the South China Sea; it will continuously serve to promote researches resolving the scientific questions relating to atoll and South China Sea. In addition to assist the on-going studies, further international co-operations are welcome to be conducted at Dongsha Atoll Research Station. Accommodations and vessels that suitable for various destinations on Dongsha Atoll are ready for researches. R/V Atoll I, Atoll II (since 2014), Atoll V and Atoll VI (2016) are equipped for different destinations on Dongsha Atoll and nearby areas. R/V Atoll I and Atoll V are convenient for operating at reef crest, but with smaller space and capacity. R/V Atoll II and Atoll VI are able to travel around fore-reefs, and the waterline of Atoll VI is 40 cm that makes this boat easy to travel in the lagoon and shallow patch reefs. Kayak and dinghy are also available for trips in Dongsha Island small lagoon.
The Atoll is composed of three parts including fore-reefs, back reefs and lagoon that can easily be identified from satellite imagery
The fore-reefs on Dongsha Atoll is defined from the edge of reef crest toward reef slope, and its well-developed spur-and grooves structure could be seen from aero photos. Reef slope extended smoothly to the water depth of 25m at a horizontal distance about 1 km from shore. Reef cliffs usually appear below the water depth of 25m, and extend to deeper ocean basin.
In Dongsha lagoon, the most eye-catching features are the patchy reefs. From satellite imagery and drone photos, hundreds of patch reefs distributed in the lagoon with variety depths and diameters of reef tops. (photo credit: Yu-ming, Chang)
The reef crest could be roughly separated into 2 parts of shallow outer reef crest and seagrass beds in inner crest (Kao et al. 2013). The outer reef crest is around 1-2 km in width from the edge of the fore-reef toward lagoon with water depth of 1-2 m and may expose to air when in spring tides. Satellite imagery and ground truth data provide practical information for reef crest on Dongsha Atoll. The reef crest could be roughly separated into 2 parts of shallow outer reef crest and seagrass beds in inner crest (Kao et al. 2013). The outer reef crest is around 1-2 km in width from the edge of the fore-reef toward lagoon with water depth of 1-2 m and may expose to air when in spring tides. Seagrasses are mainly composed by three species on the whole reef crest: Thalassia hemprichii, Cymodocea serrulata and Cymodocea rotundata; and at least three other species have been observed around Dongsha Island in restricted areas: Halodule univervis, Halodule ovalis and Syringdodium isoetifolium. The satellite imagery taken from 1994 to 2016 indicates a mass seagrass die-off in recent years (Ren et al. 2014).
Left : before die-off; Right: July, 2015 (white patches at north, northeast and southeast arcs indicate seagrass die-off areas)
More underwater videos could be found under "Multimedia: The Atoll that you don't see"
2. Water temperature, salinity, pH value, chlorophyll a, turbidity, DO, water sampling (CO2, nutrients) and zooplankton at three fixed sampling sites
The key species such as corals or bivalves were chosen with Marine National Park conservation policy. The reproduction and release studies co-operate with Penghu county marine life propagation station.
DOCO-(Soft) Coral Survey
To understand the benthic communities in reef slopes, 3-5 transects along the sea contours from 5-25 water depth are recorded by video. Three observation sites are recorded at eastern, southern, western and northern atoll respectively. In the shallow reef plats, satellites, UAVs and ground truthing are employed. There are 5 fixed observing sites in patch reefs in the atoll lagoon.
DARS welcomes international co-operation researches in Dongsha Atoll. The contacts are listed below and the detail information about DARS can be found in this site or DARS.ppt
有興趣參與上述研究或新提構想者, 請連絡本計晝主持人或共同主持人 Contacts
尚待推動工作 Further works in DARS