Phytoplankton trapped within seagrass (Posidonia oceanica) sediments are a nitrogen source: An in situ isotope labeling experiment

Cristina Barrón*, Jack J. Middelburg, Carlos Duarte

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

We examined the retention of nitrogen associated with sedimented planktonic material trapped within a Mediterranean seagrass (Posidonia oceanica) meadow with the use of 15N-enriched algal material injected into vegetated and nonvegetated sediment as a tracer. The retention of labeled nitrogen material in the sediment and the appearance in P. oceanica leaves, rhizomes, and roots was examined 3, 5, 9, and 21 d after injection. More than 80% of the label material added to the bare sediment was lost within 5 d. Labeled material was retained better in vegetated sediments. Labeled material from the sediment was taken up rapidly by the roots, translocated through the rhizomes, and accumulated in the new leaves. The amount of 15N recovered during the experiment in P. oceanica meadow was fourfold higher than that recovered in unvegetated sediment, demonstrating that the P. oceanica meadow was more efficient in retaining the nitrogen deposited as algal material than unvegetated sediments. Enhanced trapping of sestonic particles by seagrass canopies can be an efficient nutrient acquisition strategy in the oligotrophic environments that seagrasses inhabit.

Original languageEnglish (US)
Pages (from-to)1648-1653
Number of pages6
JournalLimnology and Oceanography
Volume51
Issue number4
StatePublished - Jul 1 2006

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science

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