Seasonal variations in iodine concentrations in a brown alga (Ecklonia cava Kjellman) and a seagrass (Zostera marina L.) in the northwestern Pacific coast of central Japan

2018 ◽  
Vol 75 (1) ◽  
pp. 111-117 ◽  
Author(s):  
Yuhi Satoh ◽  
Shigeki Wada ◽  
Shun’ichi Hisamatsu
Keyword(s):  
Seasonal Variations ◽  
Zostera Marina ◽  
Brown Alga ◽  
Pacific Coast ◽  
Ecklonia Cava ◽  
Northwestern Pacific ◽  
Central Japan

Relationship between iodine and carbohydrate contents in the seagrass Zostera marina on the northwestern Pacific coast of central Japan

2020 ◽  
Vol 63 (3) ◽  
pp. 273-281
Author(s):  
Yuhi Satoh ◽  
Shigeki Wada ◽  
Shun’ichi Hisamatsu
Keyword(s):  
Zostera Marina ◽  
Pacific Coast ◽  
Sampling Period ◽  
Northwestern Pacific ◽  
Central Japan ◽  
Total Iodine ◽  
Seasonal Trends ◽  
Structural Carbohydrate ◽  
Carbohydrate Contents ◽  
Galactose Content

AbstractPreviously, we reported seasonal variation in iodine contents in the seagrass Zostera marina. Herein, we sought the factors controlling this variation, and investigated relationships between iodine and carbohydrate contents, using extracts and residues of seagrass samples extracted with 0.1 N HCl. In plants, carbohydrates in HCl-extracted and residual fractions are considered to represent storage and structural carbohydrates, respectively. On average, 44% and 56% of total iodine in samples was contained in the HCl-extracted and residual fractions, respectively. Both HCl-extracted and residual iodine contents showed seasonal trends similar to that of total iodine, being high in winter–spring and low in summer. Total and HCl-extracted carbohydrate contents showed reverse seasonal trends from those of iodine, whereas residual carbohydrate contents had comparable values throughout the sampling period. In the total and HCl-extracted fractions, negative correlations between iodine and carbohydrate contents were confirmed, suggesting that carbohydrates do not play important roles in iodine accumulation. Although most monosaccharide contents were not correlated with iodine contents in these two fractions, residual galactose content was positively correlated with residual iodine. We accordingly suggest that one or more specific structural carbohydrate constituents may potentially function as an iodine store in Z. marina.

Correlation between the seasonal variations in phlorotannin content and the antiallergic effects of the brown alga Ecklonia cava subsp. stolonifera

2021 ◽  
Vol 58 ◽  
pp. 102398
Author(s):  
Yoshimasa Sugiura ◽  
Yoichi Kinoshita ◽  
Shouta Misumi ◽  
Hiroaki Yamatani ◽  
Hirotaka Katsuzaki ◽  
...  
Keyword(s):  
Seasonal Variations ◽  
Brown Alga ◽  
Ecklonia Cava ◽  
Phlorotannin Content

Brown alga Ecklonia cava attenuates type 1 diabetes by activating AMPK and Akt signaling pathways

2010 ◽  
Vol 48 (2) ◽  
pp. 509-516 ◽  
Author(s):  
Changkeun Kang ◽  
Yeung Bae Jin ◽  
Hyunkyoung Lee ◽  
Mijin Cha ◽  
Eun-tae Sohn ◽  
...  
Keyword(s):  
Type 1 Diabetes ◽  
Signaling Pathways ◽  
Brown Alga ◽  
Akt Signaling ◽  
Ecklonia Cava

scholarly journals Pliocene ostracods (Crustacea) from the Togakushi area, central Japan; palaeobiogeography of trans-Arctic taxa and Japan Sea endemic species

2008 ◽  
Vol 27 (2) ◽  
pp. 161-175 ◽  
Author(s):  
Hirokazu Ozawa ◽  
Hideaki Nagamori ◽  
Tomotaka Tanabe
Keyword(s):  
High Latitude ◽  
Endemic Species ◽  
Japan Sea ◽  
Kuroshio Current ◽  
The Arctic ◽  
Northwestern Pacific ◽  
Arctic Seas ◽  
Central Japan ◽  
The Japan Sea ◽  
Northern Atlantic

Abstract. Pliocene strata (4–3 Ma) in the Togakushi area, central Japan, yield significant ostracods, which allow investigation of the origins of high-latitude (Arctic–Atlantic) taxa and the Japan Sea endemic species, together with their post-Miocene history of extinction-speciation and migration. Three types of extinct species are found here: (1) cryophilic species in common with, or closely related to, species in Plio-Pleistocene assemblages described from the Japan Sea; (2) species closely related to, or comparable with, species that characterize Miocene Japan; and (3) species endemic to the Pliocene Japan Sea. Type (1) contains species closely related to high-latitude species known from the Arctic and northern Atlantic Oceans. Their presence suggests migration from the northwestern Pacific to the northern Atlantic through the Arctic seas since the Late Pliocene after the opening of the Bering Strait. Both Types (2) and (3) contain genera originating in the south, which show high specific diversity in regions affected by the modern warm Kuroshio Current. Ancestral ostracods of Types (2) and (3) invaded the Japan Sea from the Pacific from the Middle Miocene, and diversified to produce closely related species in the semi land-locked Japan Sea until the Early Pliocene. Two new species Aurila togakushiensis sp. nov. and Aurila shigaramiensis sp. nov. are described.

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