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ID 39885
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title alternative
Comparison of absorption coefficients between accumulated matter on the thalli of Ecklonia kurome and suspended matter in the water surrounding Ecklonia bed
creator
Niimura, Yoko
Kajita, Atsushi
Terawaki, Toshinobu
Yoshida, Goro
Hamaguchi, Masami
subject
吸収係数
クロメ
懸濁物
堆積物
広島湾
absorption coefficients
accumulated matter
Ecklonia kurome
Hiroshima Bay
light
suspended matter
NDC
Biology
abstract
海水中の懸濁物と,海藻の葉上堆積物は,ともに藻体表面に到達する光を質的かつ量的に変化させ,海藻の生産力に多大な影響を及ぼす。本研究では内湾域である広島湾における大型褐藻クロメの葉上堆積物とクロメ群落直近の海水中の懸濁物について,両者の光吸収係数を統一的手法(QFT法)に基づいて把握し,その特性を比較した。懸濁物と堆積物の全体の光吸収特性に明瞭な差は認められず,葉上堆積物の多くが沈降した懸濁物によって構成されていたことが推察された。懸濁物・堆積物ともに,デトリタスや微細藻類など多様な要素により構成されており,光合成有効波長域(400-700nm)のうち,短波長側の光は微細藻類の色素以外のデトリタスなどが,長波長側の光は微細藻類の光合成色素が吸収し,それぞれクロメの光吸収に大きく影響すると考えられた。
abstract
Light is the primary limiting factor for macroalgal production. Understanding not only the quantity but also the quality of light reaching algal thalli is important to the success of algal recovery and sustainability. This study explores the optical properties of accumulated matter on the thalli of Ecklonia kurome and suspended matter in the water surrounding an Ecklonia bed in Hiroshima Bay, based on spectral absorption coefficient estimated by the quantitative filter technique (QFT) method.

According to the experiments, minimal difference of optical properties between suspended matter and accumulated matter was recognized. It is assumed that suspended matter in the water formed the accumulated matter on the thalli of E. kurome. Both suspended matter and accumulated matter were composed of multiple components, various kinds of microalgae, detritus and inorganic matter. In the wavelength-specific photosynthetically active radiation (400-700nm), detritus and inorganic matter formed the primary absorber of blue light, while microalgal pigments was the primary absorber of red light. Each absorber in suspended and accumulated matter might attenuate specific wavelength and change the quality of light reaching the thalli of E. kurome.
journal title
Journal of the Graduate School of Biosphere Science, Hiroshima University
volume
Volume 49
start page
39
end page
47
date of issued
2010-12-24
publisher
広島大学大学院生物圏科学研究科
issn
1348-1371
ncid
naid
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
department
Graduate School of Biosphere Science
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