Stream periphyton responses to nutrient enrichment and crayfish reductions

TitleStream periphyton responses to nutrient enrichment and crayfish reductions
Publication TypeJournal Article
Year of Publication2005
AuthorsKeller TAllen, Moy ML, Stock AL, Hazlett BA
JournalJournal of Freshwater Ecology
Volume20
Issue2
Pagination303-310
KeywordsTEMPERATURE
Abstract

We used agar-filled clay pots and large cages to examine how periphyton responded to in situ manipulations of nutrient availability and crayfish in a pristince Michigan stream. By day 40, nutrient additions stimulated the autotrophic portion of the periphyton community and resulted in elevated chlorophyll a, algal abundance and biovolume. Diatoms dominated the periphyton with Oscillatoria and Spirogyra the primary filamentous genera. Crayfish, (Orconectes spp.) density had no effect on any indicator of periphyton growth. Low crayfish densities (~1 /m2) and the absence of filamentous algal dominance likely limited crayfish effects.