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• W2595025512 abstract "AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials AME 79:101-114 (2017) - DOI: https://doi.org/10.3354/ame01823 Karlodinium veneficum feeding responses and effects on larvae of the eastern oyster Crassostrea virginica under variable nitrogen:phosphorus stoichiometry Chih-Hsien (Michelle) Lin1,*, Stefano Accoroni1,2, Patricia M. Glibert1 1University of Maryland Center for Environmental Science, Horn Point Laboratory, 2020 Horns Point Road, Cambridge, Maryland 21613, USA 2Dipartimento di Scienze della Vita e dell’Ambiente, Università Politecnica delle Marche, via Brecce Bianche, 60131 Ancona, Italy *Corresponding author: clin@umces.edu ABSTRACT: Mixotrophic feeding can be promoted by nutrient-enriched prey, a nutritional strategy which can provide benefits to some toxic microalgae under nutrient-imbalanced conditions. However, it is unclear how the nutritional condition of the predator or the prey affects the mixotrophy and toxicity of toxin-producing mixotrophs. Laboratory experiments were conducted to measure growth and feeding rates of Karlodinium veneficum with addition of Rhodomonas salina as prey under varied nitrogen (N):phosphorus (P) stoichiometry (molar N:P of 4, 16 and 32) of both predator and prey and with K. veneficum initially in different growth phases (exponential and stationary). Growth rates of initially exponential- and stationary-phase K. veneficum were enhanced in the presence of prey with reciprocal nutrient conditions. Feeding rates (measured as prey death rates) were highest for low-NP K. veneficum initially growing exponentially and mixed with N-rich prey. Maximum feeding rates of low-NP K. veneficum on N-rich prey during exponential growth were ~4-fold higher than the rates of high-NP K. veneficum on N-rich prey. The nutritionally different K. veneficum were tested with larvae of the eastern oyster Crassostrea virginica to compare putative toxicity. Larval mortality was significantly increased in 2 d exposures to high-NP K. veneficum monocultures in both growth phases. When mixed with N-rich prey, the presence of K. veneficum resulted in significantly enhanced larval mortality, but this was not the case for low-NP K. veneficum in exponential phase. Enhanced growth of K. veneficum and increased negative effects of K. veneficum on larval survival appeared to be highest when fed prey with higher N:P content. KEY WORDS: Mixotrophy · Harmful algae · Karlodinium veneficum · N:P stoichiometry · Larval oyster mortality Full text in pdf format PreviousNextCite this article as: Lin CH, Accoroni S, Glibert PM (2017) Karlodinium veneficum feeding responses and effects on larvae of the eastern oyster Crassostrea virginica under variable nitrogen:phosphorus stoichiometry. Aquat Microb Ecol 79:101-114. https://doi.org/10.3354/ame01823 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 79, No. 2. Online publication date: May 09, 2017 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2017 Inter-Research." @default.
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• W2595025512 date "2017-05-09" @default.
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• W2595025512 title "Karlodinium veneficum feeding responses and effects on larvae of the eastern oyster Crassostrea virginica under variable nitrogen:phosphorus stoichiometry" @default.
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• W2595025512 doi "https://doi.org/10.3354/ame01823" @default.
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