Sumitomo Foundation grant to Dr Wyatt et al.

The Sumitomo Foundation has awarded an Environmenal Research Grant (環境研究助成) to Dr Wyatt and colleagues for their pioneering work on the environmental drivers of the structure and function of ‘twilight reefs’ (deep-water mesophotic coral ecosystems).

Title: A refuge for coral reef biodiversity: trophic function and reproduction in the twilight zone | 危機に瀕したサンゴ礁生物の避難場所:薄明帯の学際的解明による保全・再生の支援

Participants: Alex S.J. Wyatt, Toshihiro Miyajima, Toshi Nagata, James Leichter (Scripps), Satoshi Mitarai (OIST), Kazuhiko Sakai (U Ryukyu), Rob Toonen (U Hawaii).

More info: http://www.sumitomo.or.jp/html/kankyo/kantaisyo2016.htm

Thank you to the Sumitomo Foundation for their support.

 

July 2016 in Onna-son, Okinawa

Gallery

Impacts of internal waves on the twilight zone @ ICRS 2016, Hawaii (Dr Wyatt)

Ecological and biogeochemical impacts of internal waves on mesophotic coral ecosystems: testing eddy correlation and isotope approaches, Iriomote, Japan

Alex S.J. Wyatt1*, Toshihiro Miyajima1, James J. Leichter2, Tohru Naruse3, Tomohiro Kuwae4, Shoji Yamamoto5, Naomi Satoh1, Toshi Nagata1

1Department of Chemical Oceanography, Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba, JAPAN
2Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California, USA
3Tropical Biosphere Research Center, University of the Ryukyus, Taketomi, Japan
4Coastal and Estuarine Environment Research Group, Port and Airport Research Institute (PARI), Nagase, Yokosuka, JAPAN
5Department of Earth and Planetary Science, The University of Tokyo, Bunkyo-ku, Tokyo, Japan

While mesophotic coral ecosystems (MCE) may be protected or damped from disturbances impacting shallower reefs insufficient information is available on the environmental conditions supporting these ‘deep water refugia’. Nutrient inputs and recycling have rarely been quantified over MCE but may differ fundamentally to that of shallow counterparts due to the reduction in light and increasing reliance on oceanic nutrients, leading to increased heterotrophy over autotrophy at species and ecosystem levels and stronger links to oceanic processes. For instance, due to the depth of MCE relative to typical water column density stratification, internal waves may be a highly significant process depending on community aspect and exposure. Preliminary observations of MCE along a continuum of oceanic exposure in Funauki Bay, Iriomote, Japan indicate that ocean-exposed MCE are subject to semi-diurnal temperature oscillations of up to 4 C during summer (range 23 – 29 deg C), while inner MCE occur shallower in more turbid but stable environments. Oceanic exposure along the bay may determine both the distribution and function of spatially extensive, but relatively homogenous, communities dominated by Leptoseris sp. or Acropora ?horrida. Combining bulk and compound-specific stable isotope analyses, depth-specific radioisotope markers such as radiocarbon, and eddy correlation experiments in these habitat promises a useful approach for elucidating the functional importance of internal waves in the development and persistence of MCE at local to regional scales.

Tech diving at Monad Shoal, Philippines

Gallery