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Abstract

Abstract-Larvae of Acentria ephemerella live fully submerged, feeding on submersed aquatic angiosperms such as pondweeds (Potamogeton spp.) and Myriophyllum spicatum. Only the latter contains high concentrations of hydrolyzable tannins known to interfere with the growth of insect herbivores. We tested whether larvae grow faster on Potamogeton perfoliatus or M. spicatum and whether this is due to polyphenols in their food source. Larvae originating from the same egg clutch grew faster and larger on P. perfoliatus than on M. spicatum. The same growth response was observed with larvae that spent winter diapause on either P. perfoliatus or M. spicatum. These larvae were fed either with their host plant or the other macrophyte. No prior feeding effect was found, but growth of larvae reared on M. spicatum was less than when grown on P. perfoliatus. Larvae from another egg-clutch reared on M. spicatum, either from lake or cultivated in aquaria, exhibited reduced growth on the lake plants. P. perfoliatus contained less than 1% and M. spicatum (aquarium or field material) between 5 and 9% phenolic compounds. No differences in nitrogen content of leaves were found, but apical shoot sections of M. spicatum exhibited a significantly higher nitrogen content than P. perfoliatus. Our results indicate that hydrolyzable tannins are responsible for the reduced growth of Acentria when fed with M. spicatum.

Response of Submerged Macrophyte Communities to External and Internal Restoration Measures in North Temperate Shallow Lakes

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Does nitrate co-pollution affect biological responses of an aquatic plant to two common herbicides?

“…Polyphenols affect competitors like microalgae and cyanobacteria by inhibition of photosynthesis (PSII) and exoenzymes like alkaline phosphatase (Gross et al, 1996;Leu et al, 2002). These allelochemicals have also been shown to significantly reduce the growth of herbivorous Lepidopteran larvae of Acentria ephemerella (Choi et al, 2002).…”

Cannibalism and Habitat Selection of Cultured Chinese Mitten Crab: Effects of Submerged Aquatic Vegetation with Different Nutritional and Refuge Values

“…The higher concentrations of lignin and polyphenols found in Myriophyllum may help to defend it against aquatic herbivores [25,32]. Moreover, Myriophyllum tissue is less nutritious, as also indicated by the overall low growth and survival of herbivorous arthropods and gastropods feeding on a Myriophyllum diet, recorded in other investigations [33,34]. Accordingly, in our study, starving mitten crabs had no negative effect on Myriophyllum growth, and Myriophyllum actually exhibited an 8.9-16.8% biomass increase during the experiment.…”