Abstract
Differences in susceptibility to epiphytes among algal species have been explained traditionally on the basis of various defense and escape mechanisms. Gracilaria chilensis exhibits inter-strain differences to susceptibility to epiphytes but such differences seem more related to stimulation of propagule attachment rather than to defense or escape mechanisms. Culture medium previously used to grow Gracilaria stimulates recruitment of Ulva and Enteromorpha compared to settlement (recruitment) in non-used growth medium. Elimination of bacteria from the culture media does not reduce the stimulatory effect. Chemical analysis of the culture medium indicates the presence of a mixture of polysaccharides consisting mainly of sulphated galactans, similar to those present in the water soluble fraction of agar produced by Gracilaria. Additions of various concentrations of soluble fraction of agar extracted from dry thalli of Gracilaria chilensis to SWM-3 culture medium results in statistically significant increases in the density of settled spores of E. compressa and U. rigida.
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Santelices, B., Varela, D. (1993). Exudates from Gracilaria chilensis stimulate settlement of epiphytic ulvoids. In: Chapman, A.R.O., Brown, M.T., Lahaye, M. (eds) Fourteenth International Seaweed Symposium. Developments in Hydrobiology, vol 85. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1998-6_40
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DOI: https://doi.org/10.1007/978-94-011-1998-6_40
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