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Feeding deterrence of Azolla in relation to deoxyanthocyanin and fatty acid composition
Cohen, M.F.; Meziane, T.; Tsuchiya, M.; Yamasaki, H. (2002). Feeding deterrence of Azolla in relation to deoxyanthocyanin and fatty acid composition. Aquat. Bot. 74(2): 181-187
In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770, more
Peer reviewed article  

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Keywords
    Aquatic plants; Fatty acids; Feeding behaviour; Flavonoids; Flavonoids; Azolla; Azolla filiculoides; Azolla pinnata; Lymnea swinhoei; Polypedates leucomystax; Fresh water

Authors  Top 
  • Cohen, M.F.
  • Meziane, T.
  • Tsuchiya, M.
  • Yamasaki, H.

Abstract
    Higher levels of deoxyanthocyanins in Azolla fronds correlated with feeding deterrence against adult Lymnea swinhoei snails and Polypedates leucomystax tadpoles. After 7 days in co-culture, the growth yield of Azolla filiculoides was almost twice that of Azolla pinnata, which contained approximately 20-fold higher levels of deoxyanthocyanins. Inclusion of snails upon initiating a plant co-culture resulted in an A. pinnata growth yield that was 1.5-fold higher than that of A. filiculoides. The two plant species did not differ significantly in fatty acid composition. However, snails incubated for 1 week solely with A. pinnata showed a characteristic starvation-like fatty acid profile, with a two-fold lower proportion of polyunsaturated fatty acids (PUFAs) compared to snails that had access to A. filiculoides, either as a sole food source or in co-culture with A. pinnata. A 3-month cultivation of A. pinnata with tadpoles resulted in fronds having a 260% higher concentration of deoxyanthocyanins and a 10-fold lower proportion of PUFAs in comparison to plants unexposed to tadpoles, indicating that prolonged feeding reduces the desirability of the surviving plants as a food source.

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