The impacts of different concentrations of the excretory-secretory products (ESPs) of the solitary ascidian Styela rustica (Linnaeus, 1767) and the sponge Halichondria panacea (Pallas, 1766) on the settlement, metamorphosis, and mortality rates of H. panacea larvae were studied in a laboratory experiment. At high concentrations, substances released into the environment by the ascidian S. rustica exerted a negative impact on the metamorphosis rate of sponge larvae. The exposure to moderate or high concentrations of ESPs from conspecific adults led to high mortality of larval sponges; however, low conspecific ESP concentrations markedly stimulated metamorphosis; larval mortality was low. Apparently, different concentrations of the same ESPs can have effects with a different strength and focus. This should be taken into account in the study of chemically mediated interactions between aquatic organisms.
Russian Journal of Marine Biology – Springer Journals
Published: Apr 5, 2014
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