Influences of grazing on temporal patterns of algal pigments in suspended and sedimenting algae in a north temperate lake

Autor:	James P. Hurley, David E. Armstrong, David Poister
Rok vydání:	1999
Předmět:	Chlorophyll a biology Ecology Sediment Aquatic Science Sedimentation biology.organism_classification Trout chemistry.chemical_compound Oceanography Water column Algae Settling chemistry Phytoplankton Environmental science Ecology Evolution Behavior and Systematics
Zdroj:	Canadian Journal of Fisheries and Aquatic Sciences. 56:60-69
ISSN:	1205-7533 0706-652X
Popis:	The concentrations of phytoplankton pigments in suspended and settling particles were measured in Trout Lake, Wisconsin, U.S.A., during the 1993 ice-free season. A decrease in water column concentrations of chlorophyll a coincident with an increase in pheophorbide and pheophytin concentrations occurred during a "clear-water" phase in June. The lack of a corresponding decrease in carotenoid pigment concentrations indicated that carotenoid pigments were degraded to a lesser extent than chlorophyll a during this period of heavy grazing pressure. Chlorophyll a, pheophorbide, and pheophytin showed temporal trends in fluxes to sediment traps that were similar for all pigments but did not correspond to trends in water column pigment concentration. Fucoxanthin concentrations and microscopic examination indicated that the sedimentation of large, dense diatoms increased the sedimentation rate of chlorophyll during the clear-water phase. In addition, ungrazed diatoms apparently were the main source of pheophorbide in trap material during the clear-water phase, indicating that pheophorbide should not be used as a surrogate for fecal pellet sedimentation in lakes influenced by the sedimentation of large diatoms.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cea8304ac48fb32d7c7371005eb1aa71 https://doi.org/10.1139/f98-153 Zobrazit plný text záznamu