University of Tasmania
Browse
1998_Sherwood_Amathamide.pdf (309.74 kB)

Amathamide alkaloids in the pycnogonid, Stylopallene longicauda, epizoic on the chemically defended bryozoan, Amathia wilsoni

Download (309.74 kB)
journal contribution
posted on 2023-11-02, 05:02 authored by J Sherwood, JT Walls, DA Ritz
Amathamides comprise a group of brominated alkaloids found in the bryozoan, Amathia wilsoni Kirkpatrick (Gymnolaemata: Ctenostomata). We tested a crude bryozoan extract and purified amathamide C for their ability to deter feeding by fish, Acanthaluteres spilomelarnurus (Quoy and Gaimard, 1824 ) (Leatherjacket), in laboratory assays. Food pellets made with crude extracts (1 % dry weight) caused 94% inhibition of artificial pellet acceptance, while amathamide C at 0.1 % dry weight caused 86% inhibition. These results suggest amathamides serve as chemical defences of A. wilsoni. Because bryozoans are often colonised by epibionts, we also examined representatives of the epizoic community on A. wilsoni , using gas chromatography! mass spectrometry (GCMS) for the presence of amathamides. Of 34 epizoic species tested, only one, the sea spider Stylopallene longicauda Stock which was present in high average densities, contained amathamides in concentrated amounts even when deprived of food for 36 hours. In view of the demonstrated feeding deterrence of amathamides in bryozoans, the relatively high epizoic density of S. longicauda and its apparent aposematic colouration suggest that amathamides may also function as chemical defences for S. longicauda.

History

Publication title

Papers & Proceedings of the Royal Society of Tasmania

Volume

132

Pagination

65-70

ISSN

0080-4703

Rights statement

Copyright Royal Society of Tasmania.

Usage metrics

    Royal Society of Tasmania

    Categories

    No categories selected

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC