کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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4396111 | 1618449 | 2012 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Renillenoic acids: Feeding deterrence and antifouling properties of conjugated fatty acids in Patagonian sea pen Renillenoic acids: Feeding deterrence and antifouling properties of conjugated fatty acids in Patagonian sea pen](/preview/png/4396111.png)
Chemical studies in the octocoral Renilla octodentata from San Jorge Gulf (Patagonia, Argentina) have been carried out for the first time. Two conjugated polyunsaturated fatty acids, 1 and 2, named renillenoic acids (RAs), were isolated and characterized from the sea pen. These compounds, analogs of eicosapentaenoic acid (EPA) and arachidonic acid (AA), accounted for a large fraction (20%) of the organic extract of the octocoral. Renillenoic acids were uniform distributed in rachis and peduncle and showed comparable volumetric concentrations, 1.61 ± 0.51 mg/cm3 and 2.00 ± 1.01 mg/cm3 respectively (Paired Student's t-test, two tailed, p > 0.05).Below physiological concentrations, octocoral extracts (28.20 mg/g), rachis tissue and sclerites (0.66 ± 0.02 g/g) showed feeding deterrence against the generalist fish Pagrus pagrus (Fisher exact test, one tailed, p < 0.0443). Antifouling assays using larvae of the crustacean Amphibalanus amphitrite revealed anti-settlement activity of octocoral extracts (acetone extract = 1.49 mg/L, diethyl ether extract = 3.16 mg/L). Renillenoic acids 1 and 2 were active against cypris larvae (EC50 = 4.09 mg/L) and showed favorably low toxicities against nauplii and cyprids (LC50 over 100 mg/L). The results suggest that chemical and physical defense of R. octodentata operate additively or synergistically to protect the sessile organisms from generalist predators and biofoulers.
► Conjugated polyunsaturated fatty acids were characterized from Renilla octodentata.
► Renillenoic acids, RAs, were uniform distributed in the colony of the octocoral.
► R. octodentata uses RAs together with sclerites as a defense against predation.
► RAs showed good anti-settlement activity against cyprids of A. amphitrite.
Journal: Journal of Experimental Marine Biology and Ecology - Volumes 416–417, 15 April 2012, Pages 208–214