Nutrient dynamics of seagrass ecosystems: 15N evidence for the importance of particulate organic matter and root systems

Evrard, Victor; Kiswara, Wawan; Bouma, Tjeerd J.; Middelburg, Jack J.

doi:10.3354/meps295049

Cited by 55 publications

(39 citation statements)

References 43 publications

(39 reference statements)

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“…The sequence of processes affected by the seagrass starts with enhanced sediment deposition and retention Ward et al 1984;Agawin and Duarte 2002), followed by enhanced mineralization (e.g., Hemminga and Duarte 2000;Holmer et al 2003) and plant uptake of the released nutrients. This is an efficient mechanism to sustain high seagrass productivity in oligotrophic waters (Evrard et al 2005). The net result of these processes is a capacity to sequester nutrients from seston, which might contain a large fraction of the total nutrient pool in oligotrophic ecosystems.…”

Section: Discussionmentioning

confidence: 99%

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

Barrín

Middelburg

Duarte

2006

Limnology & Oceanography

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We examined the retention of nitrogen associated with sedimented planktonic material trapped within a Mediterranean seagrass (Posidonia oceanica) meadow with the use of 15 N-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 15 N 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.

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Section: Discussionmentioning

confidence: 99%

“…Although seagrasses cannot increase nutrient concentrations in the water column, their canopies have a remarkable capacity to trap suspended materials and increase sedimentation rates relative to adjacent unvegetated sediments (e.g., Agawin and Duarte 2002). These trapped particles could be a potential nutrient source Evrard et al 2005).…”

mentioning

confidence: 99%

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

Barrín

Middelburg

Duarte

2006

Limnology & Oceanography

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“…15 N-labelled detritus consisting of phytoplankton injected into or trapped in the sediment was taken up by the roots and translocated to the leaves (Evrard et al 2005, Barrón et al 2006. Together with the uptake of decomposition products via the leaves, shown in the present study, this explains the high retention of N found in these tropical seagrass meadows (cf.…”

Section: Uptake Of Released Nmentioning

confidence: 99%

“…At seagrass community level, 15 N-tracer experiments have been performed to study the role of benthic vegetation as sinks of N inputs (Lepoint et al 2004) or the retention efficiency of N in seagrass ecosystems (Stapel et al 2001, Evrard et al 2005, Barrón et al 2006.…”

Section: Introductionmentioning

confidence: 99%

Regeneration of nitrogen (15N) from seagrass litter in tropical Indo-Pacific meadows

Vonk¹,

Stapel²

2008

Mar. Ecol. Prog. Ser.

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“…Drifting surface scums may thus be an important nutrient vector in pelagic-littoral coupling. Prior to the current study, however, the efficiency with which macrophytes are able to utilize this abundant but particulate nutrient resource has received relatively little attention (Evrard et al 2005;Barró n et al 2006).…”

mentioning

confidence: 99%

Sedimented cyanobacterial detritus as a source of nutrient for submerged macrophytes (Vallisneria spiralis and Elodea nuttallii): An isotope labeling experiment using ¹⁵N

Zhang

Liu

et al. 2010

Limnology & Oceanography

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A tracer experiment using the nitrogen isotope 15 N investigated the uptake and incorporation of nitrogen from sedimented cyanobacterial detritus by two species of submerged macrophytes, the native Vallisneria spiralis and the exotic Elodea nuttallii, in Lake Taihu (China). The cyanobacterium Microcystis was labeled with 15 Nammonium and dried to produce detritus, which was injected into vegetated sediments and traced to establish the fate of particulate nitrogenous material. Samples of the inoculated sediment and all parts of the plants growing therein were examined for excess 15 N after 3, 5, 9, and 22 d. Microcystis-derived nitrogen was assimilated rapidly by the plants, then translocated from the roots to the shoots and stored in different parts of the plants, where it supports growth. The ability to utilize and retain nutrients originating from sedimented cyanobacterial detritus was significantly higher in V. spiralis than in E. nuttallii. Cyanobacterial scums such as the Microcystis blooms of Lake Taihu, which drift and deposit in the sediments of the littoral zones, are an important nutrient source for macrophytes, particularly in downwind areas.

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Nutrient dynamics of seagrass ecosystems: 15N evidence for the importance of particulate organic matter and root systems

Cited by 55 publications

References 43 publications

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

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

Regeneration of nitrogen (15N) from seagrass litter in tropical Indo-Pacific meadows

Sedimented cyanobacterial detritus as a source of nutrient for submerged macrophytes (Vallisneria spiralis and Elodea nuttallii): An isotope labeling experiment using ¹⁵N

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Nutrient dynamics of seagrass ecosystems: 15N evidence for the importance of particulate organic matter and root systems

Cited by 55 publications

References 43 publications

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

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

Regeneration of nitrogen (15N) from seagrass litter in tropical Indo-Pacific meadows

Sedimented cyanobacterial detritus as a source of nutrient for submerged macrophytes (Vallisneria spiralis and Elodea nuttallii): An isotope labeling experiment using 15N

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Sedimented cyanobacterial detritus as a source of nutrient for submerged macrophytes (Vallisneria spiralis and Elodea nuttallii): An isotope labeling experiment using ¹⁵N