Algae Ascophyllum nodosum

Brown alga, Ascophyllum nodosum, whole Nonway locations... 

Haug, A., S. Melson, and S. Omang. 1974. Estimation of heavy metal pollution in two Norwegian fjord areas by analysis of the brown alga Ascophyllum nodosum. Environ. Pollut. 7 179-192. 

Algae and macrophytes 11 species Brazil November 1989 whole Alga, Ascophyllum nodosum 2.4-6.9 DW 14... 

Pavia H, Cervin G, Lindgren A, Aberg P (1997) Effects of UV-B radiation and simulated herbivory on phlorotannins in the brown alga Ascophyllum nodosum. Mar Ecol Prog Ser 157 139-146 Pawlik JR (1993) Marine invertebrate chemical defenses. Chem Rev 93 1911-1922 Pettit GR, Kamano Y, Herald CL, Tuinman AA, Boettner FE, Kizu H, Schmidt JM, Baczynskyj L, Tomer KB, Bontems RJ (1987) The isolation and structure of a remarkable marine animal antineoplastic constituent dolastatin 10. J Am Chem Soc 109 6883-6885 Pfander H, Stoll H (1991) Terpenoid glycosides. Nat Prod Rep 8 69-95... 

Pavia H, Cervin G, Lindgren A, Aberg P (1997) Effects of UV-B radiation and simulated her-bivory on phlorotannins in the brown alga Ascophyllum nodosum. Mar Ecol Prog Ser 157 139-146... 

Many seaweeds apparently do not induce higher levels of secondary metabolites when grazed. Clipping experiments have failed to induce increased defenses in the brown alga Ascophyllum nodosum the green seaweeds Halimeda, Udotea, and Caulerpa,xm and the kelp Hedophyllum... 

The stress of ultraviolet radiation can also induce increased production of secondary metabolites, as the brown alga Ascophyllum nodosum produced 30% more phlorotannins when exposed... 

Figure 1. Seasonal release rates of CHBrj, CHBr2Cl, and CH2Br2to seawater by the brown algae, Ascophyllum nodosum and Fucus veslculosls. Open symbols Indicate no detectable release.

Hans Vilter, who revealed the nature of the first representative of the large family of VHPOs, a bromoperoxidase (VBrPO) present in the marine brown alga Ascophyllum nodosum, described the history of his discovery in the following way ... 

Phlorotannins Phlorotannins are secondary metabolites analogous to the shikimate-derived condensed polyphenolics found in plants and brown algae and absorb strongly from 280 to 320 nm [115]. Exposure to UV-B was found to increase the concentration of phlorotannins in the brown alga Ascophyllum nodosum [116]. That phlorotannins act in photoprotection may be the reason why MAAs are virtually absent in brown algae in comparison to red and green... 

H. Pavia, G. Cervin, A. Linfgren, P. Aberg (1997). Effects of UV-B radiation and simulated herbivory on phlorotanins in the brown algae Ascophyllum nodosum. Mar. Ecol Progr. Ser., 157,139-146. 

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