Dissolved organic matter uptake in a temperate seagrass ecosystem

Marine Ecology Progress Series

Karline Soetaert¹  Miguel Lara¹  Tjeerd J. Bouma¹  Edward P. Morris¹  Pieter van Rijswijk¹  Fernando G. Brun¹  Iris E. Hendriks¹  Bart Veuger¹  Tom Van Engeland¹  Gloria Peralta¹  Jack J. Middelburg¹ 

关键词: Dissolved organic matter;    Seagrass ecosystems;    Uptake;    Complexity;    Phytoplankton;    Epiphytes;    Zostera noltii;    Cymodocea nodosa;    Caulerpa prolifera;   

DOI  :  10.3354/meps10183

学科分类：海洋学与技术

来源: Inter-Research

【 摘 要 】

ABSTRACT: We assessed the utilization of inorganic and organic nitrogen compounds of different complexity by primary producers and bacteria in a seagrass ecosystem. Using double-labeled (¹³C and ¹⁵N) substrates, the net transfers from the dissolved nitrogen and carbon pools to phytoplankton, planktonic bacteria, epiphytes, seagrasses (Zostera noltii and Cymodocea nodosa), and a macroalga (Caulerpa prolifera) were quantified in field incubations. Phytoplankton was the largest nitrogen sink, followed by the epiphytic community. In contrast, carbon fixation was dominated by the macrophytes. Although compartment-specific variations existed, NH₄⁺ was generally preferred over NO₃^- and urea. Specific uptake rates of individual amino acids were inversely related to their C:N ratio and their structural complexity (glycine > L-leucine > L-phenylalanine). In addition, biomarker-specific measurements (polar lipid-derived fatty acids and D-alanine) indicated increasing bacterial contributions to carbon uptake with increasing amino acid structural complexity. All primary producers acquired nitrogen from a complex pool of algae-derived dissolved organic matter (DOM), but algae-derived dissolved organic carbon (DOC) was almost exclusively used by the planktonic compartment. In contrast, a similar complex pool of bacteria-derived DOM was not taken up in significant quantities by any of the primary producers. Our results illustrate that dissolved organic nitrogen (DON) can provide bioavailable nitrogen to primary producers and bacteria in seagrass ecosystems on very short time-scales, and DON and DOC dynamics are largely uncoupled and must be investigated as 2 separate interacting pools.

【 授权许可】

Unknown