NDLI: Bioassay analysis of nutrient and Artemia franciscana effects on trophic interactions in the Great Salt Lake, USA

Content Provider	Springer Nature Link
Author	Ogata, Elizabeth M. Wurtsbaugh, Wayne A. Smith, Trinity N. Durham, Susan L.
Copyright Year	2016
Abstract	14-day microcosm experiments demonstrated the strong interactions between bottom–up and top–down effects of nutrient addition (control, nitrogen, phosphorus, nitrogen + phosphorus) and Artemia franciscana grazing on algae in Great Salt Lake water from Gilbert Bay. Nitrogen addition increased phytoplankton chlorophyll concentrations, while phosphorus addition had no stimulatory effect. A combined N + P treatment was synergistic, increasing both phytoplankton and periphyton >10-fold above controls. Our results suggest that phytoplankton were primarily limited by nitrogen and secondarily limited by phosphorus and that periphyton was colimited by nitrogen and phosphorus. The grazing effect increased as A. franciscana grew from nauplii to adults and by the final day, A. franciscana had markedly reduced both phytoplankton and periphyton abundance in the Control, +N, and +P treatments. Grazing also significantly reduced periphyton in the N + P treatments. Due to high phytoplankton growth rates in the N + P treatment, A. franciscana grazing did not significantly reduce chlorophyll concentrations during the bioassay. However, A. franciscana in the N + P treatment was significantly larger and had greater reproductive output than in the controls, suggesting that the following generation might have exerted greater grazing pressure.
Starting Page	1
Ending Page	16
Page Count	16
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	788
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Springer International Publishing
Publisher Date	2016-06-23
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Great Salt Lake Trophic Nitrogen Phosphorus Artemia franciscana Saline Freshwater & Marine Ecology Ecology Zoology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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