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Transfer of secondary metabolites from the spongesDysidea fragilis andPleraplysilla spinifera to the mantle dermal formations (MDFs) of the mudibranchHypserlodoris webbi (1994)

Fontana, A. ; Giménez, F. ; Marin, A. ; [et al.]

Springer

Cellular and molecular life sciences 50 (1994), S. 510-516

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ISSN: 1420-9071

Keywords: Nudibranch ; Hypselodoris ; sponge ; Dysidea ; Pleraplysilla ; Microciona ; furanosesquiterpenoids

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Abstract The opisthobranch molluscHypselodoris webbi is able to select, among its potential preys, sponges chemically rich in furanosesquiterpenoids. The sequestered secondary metabolites act as defensive allomones against predators and are accumulated in some dorsal glands (MDFs). This transfer from sponges to MDFs has been proven by maintainingH. webbi together with some selected sponges in an aquarium for a prolonged period.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01920760

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Defensive strategy of twoHypselodoris nudibranchs from Italian and Spanish coasts (1991)

Avila, C. ; Cimino, G. ; Fontana, A. ; [et al.]

Springer

Journal of chemical ecology 17 (1991), S. 625-636

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ISSN: 1573-1561

Keywords: Opisthobranch ; nudibranch ; Hypselodoris webbi ; Hypselodoris ; villafranca ; sponge ; Dysidea fragilis ; chemical defense ; longifolin ; nakafuran-9 ; isotavacfuran

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Chemistry and Pharmacology

Notes: Abstract Hypselodoris nudibranchs from different geographic areas (Spain and Italy) have been studied in order to investigate their general defensive strategy. Longifolin (1) and nakafuran-9 (2) are the main ichthyodeterrent allomones used by the mollusks to avoid predation. Evidence of their dietary origin is presented and the very effective strategy against predators, which includes secretion of allomones into the mucus and their storage into specific mantle dermal formations (MDFs), is also discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00982131

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Defensive allomones in three species ofHypselodoris (gastropoda: Nudibranchia) from the Cantabrian sea (1993)

Fontana, A. ; Avila, C. ; Martinez, E. ; [et al.]

Springer

Journal of chemical ecology 19 (1993), S. 339-356

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ISSN: 1573-1561

Keywords: Opisthobranch ; nudibranch ; Hypselodoris ; chemical defense ; prey-predator relationship ; mantle dermal formations ; furanosesquiterpenoids ; Dysideidae

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Chemistry and Pharmacology

Notes: Abstract ThreeHypselodoris species,H. villafranca, H. cantabrica, and H. tricolor, have been studied in order to further investigate the defensive strategies of Chromodorididae mollusks from Iberian coasts. All animals possess large amounts of furanosesquiterpenoids, probably derived from their diet of sponges. The products are transferred and stored in specific sites of the mantle (mantle dermal formations, MDFs) to be used as chemical deterrents against predators. Chemical analysis of CantabrianHypselodoris species has led to the characterization of eight sesquiterpenoids. Among these, six have been found previously in both sponges and nudibranchs, while two are new natural products.Hypselodoris species cooccurring in the same area contained comparable mixtures of sesquiterpenoids. However, two populations ofH. cantabrica from different sites of the Cantabrian sea showed different metabolic patterns. All sesquiterpenoids induce feeding deterrence inCarassius auratus and two are also toxic toGambusia affinis.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00993700

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Application of two-dimensional shift correlated NMR techniques to the structure determination of an unusual marine alkaloid, isosaraine-2 (1991)

Cimino, G. ; Fontana, A. ; Madaio, A. ; [et al.]

Chichester : Wiley-Blackwell

Organic Magnetic Resonance 29 (1991), S. 327-332

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ISSN: 0749-1581

Keywords: Saraines ; 2D COSY NMR ; 2D 1H-13C COSY NMR ; Alkaloids ; Sponge ; Reniera sarai ; Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: An extensive application of two-dimensional proton-proton and proton-carbon shift correlated spectroscopy allowed the structural elucidation of isosaraine-2, a minor component of an unique family of alkaloids from the sponge Reniera sarai.

Additional Material: 2 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/mrc.1260290408

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