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Environmental Science & Technology 2018 Journal of Environmental Research
Page 54
March 29-31, 2018
Vienna, Austria
4th Edition of International Conference on
Environmental Science
& Technology 2018
The skeleton of brain corals (Diploria strigosa) collected near the
mouth of Haina River in Saint Domingo, Dominican Republic,
were analyzed for lead (Pb) in order to reconstruct the history of
local pollution of heavy metals in the river catchment area. The
micro-samples from the sampling transect along the growth axis
of a coral colony (Colony id: SDM13-02) were prepared to study the
temporal variability of heavy metal loading from the Haina River.
The Pb concentrations in the skeletal samples were measured
using an inductively coupled plasma mass spectrometer. Since
annual banding in the coral skeleton was not clear, we measured
Sr/Ca ratios of micro-samples to determine the age of the coral
colony. The age model was constructed by matching Sr/Ca
ratio variations with seawater temperature since skeletal Sr/
Ca ratio predominantly reflects seawater temperature. The Pb
concentrations near the bottom of the colony, which corresponds
to the skeletal portion precipitated around 2000, were significantly
high as compared to the remaining part of the skeletal transect
with Pb variations of baseline/background levels. Another coral
colony collected nearby SDM13-02 colony also showed similar
temporal variation of Pb along the growth axis. The results suggest
that the coral Pb profiles presumably reflect the pollution history
of the coastal area off Haina River mouth. Further investigation
is required to confirm coral ability for reconstructing heavy metal
pollution in the coastal areas. Corals may be unique archives not
only for past climate records but also for pollution history.
Recent Publications
1. Satoshi Nakai, Jun-ya Shibata, Akira Umehara, Tetsuji
Okuda and Wataru Nishijima (2018) Filtration rate of
the ascidian Ciona savignyi and its possible impact.
Thalassas: An International Journal of Marine
Sciences DOI: 10.1007/s41208-017-0061-y.
2. Bell T, Nishida K, Ishikawa K, Suzuki A, Nakamura T,
Sakai K, Ohno Y, Iguchi A and Yokoyama Y (2017)
Temperature-controlled culture experiments with
primary polyps of coralAcroporadigitifera: calcification
rate variations and skeletal Sr/Ca, Mg/Ca, and Na/
Ca ratios. Palaeogeography, Palaeoclimatology,
Palaeoecology DOI: 10.1016/j.palaeo.2017.03.016
3. Nakamura T, Iguchi A, Suzuki A, Sakai K and Nojiri
Y(2017) Effects of acidified seawater on calcification,
photosynthetic efficiencies, and the recovery
processes from strong light exposure in coral
Stylophora pistillata. Marine Ecology DOI: 10.1111/
maec.12444
4. Iwasaki S, M Inoue, ASuzuki, OSasaki, HKano, A Iguchi,
K Sakai and H Kawahata (2016) The role of symbiotic
algae in the formation of the coral polyp skeleton: 3-D
morphological study based on X-ray microcomputed
tomography. Geochemistry, Geophysics, Geosystems
17:3629-3637.
5. Wataru Nishijima, Akira Umehara, Satoshi Sekito,
Tetsuji Okuda and Satoshi Nakai (2016) Spatial
and temporal distributions of secchi depths in the
Suo Nada of the Seto Inland Sea, Japan, exposed to
anthropogenic nutrient loading, Science of the Total
Environment 571:543-550.
Biography
Satoshi Nakai has completed his PhD in Tokyo University of Agriculture and
Technology and Postdoctoral studies from the Japan Society for the Pro-
motion of Science. He is a Professor at Faculty of Engineering, Hiroshima
University, Japan. He has published more than 100 papers in journals.
Reconstruction of lead pollution history based on analysis of coral
skeleton samples
Satoshi Nakai1, Mayuri Inoue2, Atsushi Suzuki3, Tetsuji Okuda4, Yuji Sakuno1 ,
Wataru Nishijima1, Marcos Rodriguez5 and Conrado Depratt 5
1Hiroshima University, Japan
2Okayama University, Japan
3National Institute of Advanced Industrial Science and Technology, Japan
4Ryukoku University, Japan
5Autonomous University of Santo Domingo, Dominican Republic
Satoshi Nakai et al., J Environ Res, Volume 2