caa a22 4500 378923668 CHVBK 20180305123611.0 cr unu---uuuuu 161128e20040413xx s 000 0 eng 10.1515/BOT.2004.015 doi (NATIONALLICENCE)gruyter-10.1515/BOT.2004.015 A dolabellane diterpene from the brown alga Dictyota pfaffii as chemical defense against herbivores [Elektronische Daten] [Jussara P. Barbosa, Valéria L. Teixeira, Renato C. Pereira] Laboratory and field experiments assessed the defensive properties of the crude extract and major secondary metabolite found in the Brazilian brown alga Dictyota pfaffii. Natural concentrations of the crude organic extract of D. pfaffii significantly inhibited feeding by the sea urchin Lytechinus variegatus and generalist herbivore fishes in the field. In contrast, the crude extract did not inhibit feeding by the crab Pachygrapsus transversus. Chemical defensive action against the sea urchin and the generalist fishes was due to the diterpenoid 10,18-diacetoxy-8-hydroxy-2,6-dolabelladiene found as the major natural product in D. pfaffii. However, this compound did not inhibit feeding by P. transversus as readily as the crude extract. This is the first report showing that Dictyota species produce dolabellane diterpenes as chemical defense against herbivory. In addition, these results widen the action spectrum of secondary metabolites found in species of this brown algal genus. Since dolabellanes constitute the major skeleton type found in Dictyota, we suggest that these diterpenes may play an important ecological function as defenses to the Dictyota species worldwide. Copyright © 2004 by Walter de Gruyter GmbH & Co. KG Hydrobiology nationallicence Mycology, fungi nationallicence Botany & plant sciences nationallicence Barbosa Jussara P. aut Teixeira Valéria L. aut Pereira Renato C. aut Botanica Marina Walter de Gruyter 47/2(2004-04-13), 147-151 0006-8055 47:2<147 2004 47 botm https://doi.org/10.1515/BOT.2004.015 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/BOT.2004.015 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Barbosa Jussara P. aut NATIONALLICENCE 700 1- Teixeira Valéria L. aut NATIONALLICENCE 700 1- Pereira Renato C. aut NATIONALLICENCE 773 0- Botanica Marina Walter de Gruyter 47/2(2004-04-13), 147-151 0006-8055 47:2<147 2004 47 botm CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter