Does the nutrient stoichiometry of primary producers affect the secondary consumer Pleurobrachia pileus?

Katherina L. Schoo, Nicole Aberle, Arne M. Malzahn, Maarten Boersma

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We investigated whether phosphorus limitations of primary producers propagate upwards through the food web, not only to the primary consumer level but also onto the secondary consumers' level. A tri-trophic food chain was used to assess the effects of phosphorus-limited phytoplankton (the cryptophyte Rhodomonas salina) on herbivorous zooplankters (the copepod Acartia tonsa) and finally on zooplanktivores (the ctenophore Pleurobrachia pileus). The algae were cultured in phosphorus-replete and phosphorus-limited media before being fed to two groups of copepods. The copepods in turn were fed to the top predator, P. pileus, in a mixture resulting in a phosphorus-gradient, ranging from copepods having received only phosphorus-replete algae to copepods reared solely on phosphorus-limited algae. The C:P ratio of the algae varied significantly between the two treatments, resulting in higher C:P ratios for those copepods feeding on phosphorus-limited algae, albeit with a significance of 0.07. The differences in the feeding environment of the copepods could be followed to Pleurobrachia pileus. Contrary to our expectations, we found that phosphorus-limited copepods represented a higher quality food source for P. pileus, as shown by the better condition (expressed as nucleic acid content) of the ctenophore. This could possibly be explained by the rather high C:P ratios of ctenophores, their resulting low phosphorus demand and relative insensitivity to P deficiency. This might potentially be an additional explanation for the observed increasing abundances of gelatinous zooplankton in our increasingly phosphorus-limited coastal seas.

Original languageEnglish
Pages (from-to)233-242
Number of pages10
JournalAquatic Ecology
Volume44
Issue number1
DOIs
Publication statusPublished - Feb 2010

Fingerprint

stoichiometry
algae
phosphorus
Copepoda
nutrient
nutrients
Ctenophora
alga
Pleurobrachia
Rhodomonas
Acartia tonsa
food quality
nucleic acid
food chain
nucleic acids
food webs
food web
zooplankton
phytoplankton
predator

Keywords

  • Ctenophores
  • Ecological stoichiometry
  • Gelatinous zooplankton
  • Marine food webs
  • Phosphorus limitation
  • Trophic transfer

ASJC Scopus subject areas

  • Aquatic Science
  • Ecology, Evolution, Behavior and Systematics

Cite this

Does the nutrient stoichiometry of primary producers affect the secondary consumer Pleurobrachia pileus? / Schoo, Katherina L.; Aberle, Nicole; Malzahn, Arne M.; Boersma, Maarten.

In: Aquatic Ecology, Vol. 44, No. 1, 02.2010, p. 233-242.

Research output: Contribution to journalArticle

Schoo, Katherina L. ; Aberle, Nicole ; Malzahn, Arne M. ; Boersma, Maarten. / Does the nutrient stoichiometry of primary producers affect the secondary consumer Pleurobrachia pileus?. In: Aquatic Ecology. 2010 ; Vol. 44, No. 1. pp. 233-242.
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