Next Article in Journal
Nitrogen Pools in Tropical Plantations of N2-Fixing and Non-N2-Fixing Legume Trees under Different Tree Stand Densities
Previous Article in Journal
Fate of Nitrogen from Artichoke (Cynara cardunculus L. var. scolymus (L.)) Crop Residues: A Review and Lysimeter Study
Article

Physiological Responses of the Copepods Acartia tonsa and Eurytemora carolleeae to Changes in the Nitrogen:Phosphorus Quality of Their Food

Horn Point Laboratory, University of Maryland Center for Environmental Science, P.O. Box 775, Cambridge, MD 21613, USA
*
Author to whom correspondence should be addressed.
Received: 27 December 2020 / Revised: 10 February 2021 / Accepted: 17 February 2021 / Published: 8 March 2021
Two contrasting estuarine copepods, Acartia tonsa and Eurytemora carolleeae, the former a broadcast spawner and the latter a brood spawner, were fed a constant carbon-based diatom diet, but which had a variable N:P content, and the elemental composition (C, N, P) of tissue and eggs, as well as changes in the rates of grazing, excretion, egg production and viability were measured. To achieve the varied diet, the diatom Thalassiosira pseudonana was grown in continuous culture at a constant growth rate with varying P supply. Both copepods altered their chemical composition in response to the varied prey, but to different degrees. Grazing (clearance) rates increased for A. tonsa but not for E. carolleeae as prey N:P increased. Variable NH4+ excretion rates were observed between copepod species, while excretion of PO43− declined as prey N:P increased. Egg production by E. carolleeae was highest when eating high N:P prey, while that of A. tonsa showed the opposite pattern. Egg viability by A. tonsa was always greater than that of E. carolleeae. These results suggest that anthropogenically changing nutrient loads may affect the nutritional quality of food for copepods, in turn affecting their elemental stoichiometry and their reproductive success, having implications for food webs. View Full-Text
Keywords: nitrogen; phosphorus; Acartia tonsa; Eurytemora carrolleeae; fecundity; food quality; ecological stoichiometry nitrogen; phosphorus; Acartia tonsa; Eurytemora carrolleeae; fecundity; food quality; ecological stoichiometry
Show Figures

Graphical abstract

MDPI and ACS Style

Bentley, K.M.; Pierson, J.J.; Glibert, P.M. Physiological Responses of the Copepods Acartia tonsa and Eurytemora carolleeae to Changes in the Nitrogen:Phosphorus Quality of Their Food. Nitrogen 2021, 2, 62-85. https://0-doi-org.brum.beds.ac.uk/10.3390/nitrogen2010005

AMA Style

Bentley KM, Pierson JJ, Glibert PM. Physiological Responses of the Copepods Acartia tonsa and Eurytemora carolleeae to Changes in the Nitrogen:Phosphorus Quality of Their Food. Nitrogen. 2021; 2(1):62-85. https://0-doi-org.brum.beds.ac.uk/10.3390/nitrogen2010005

Chicago/Turabian Style

Bentley, Katherine M., James J. Pierson, and Patricia M. Glibert 2021. "Physiological Responses of the Copepods Acartia tonsa and Eurytemora carolleeae to Changes in the Nitrogen:Phosphorus Quality of Their Food" Nitrogen 2, no. 1: 62-85. https://0-doi-org.brum.beds.ac.uk/10.3390/nitrogen2010005

Find Other Styles

Article Access Map by Country/Region

1
Back to TopTop