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Nutrient Recycling: A Strategy of a Grazer Community to Overcome Nutrient Limitation

We examined in situ the fate of N in the epilithon and a grazer community in the N-limited rocky littoral of Lake Erken, Sweden. The grazer community consisted of the sessile caddisfly larva Tinodes waeneri (L.) plus its gallery. The gallery consisted of a web that is spun by the larva plus the microorganisms (mostly algae) closely associated with the web. We applied 15N in the field and recorded 15N uptake and retention time. The galleries took up 15N faster from the overlying water and retained 15N 1 wk longer than the surrounding epilithon. These results supported our hypothesis that effective N use through the Tinodes community by recycling may alleviate N limitation and enhance biomass production of the gallery algae.