Dual processes for cross-boundary subsidies: incorporation of nutrients from reef-derived kelp into a seagrass ecosystem

Hyndes, Glenn A., Lavery, Paul S. and Doropoulos, Christopher (2012) Dual processes for cross-boundary subsidies: incorporation of nutrients from reef-derived kelp into a seagrass ecosystem. Marine Ecology-Progress Series, 445 29: 97-107. doi:10.3354/meps09367


Author Hyndes, Glenn A.
Lavery, Paul S.
Doropoulos, Christopher
Title Dual processes for cross-boundary subsidies: incorporation of nutrients from reef-derived kelp into a seagrass ecosystem
Journal name Marine Ecology-Progress Series   Check publisher's open access policy
ISSN 0171-8630
1616-1599
Publication date 2012-01
Sub-type Article (original research)
DOI 10.3354/meps09367
Open Access Status DOI
Volume 445
Issue 29
Start page 97
End page 107
Total pages 11
Place of publication Oldendorf, Germany
Publisher Inter-Research
Collection year 2013
Language eng
Abstract Movement of organic material across ecosystem boundaries can be critical for subsidizing production in recipient systems, particularly in systems with low in situ productivity or resource availability. Yet, what happens in highly productive and resource-rich ecosystems? Kelp, which is dislodged in high quantities in temperate regions, can accumulate in seagrass ecosystems where productivity and resource availability are high. Using an experimental approach of adding isotopically-labelled (15N) kelp in laboratory and field experiments, we tested whether allochthonous kelp could be incorporated into seagrass ecosystems via (1) the uptake of leached nutrients by macrophytes and (2) the assimilation of nutrients by consumers. Seagrass and epiphytes assimilated kelp-15N under laboratory and field conditions, with epiphytes showing a greater rate of uptake than the seagrass leaves. Unlabelled kelp leached 1225 and 736 -g N (100 g kelp)-1 d-1 of dissolved organic nitrogen from freshly detached and 2 wk old kelp, respectively. Mesograzers (gastropods) assimilated kelp-15N under laboratory and field conditions, despite the presence of alternative food sources. We conclude that reef-derived kelp can act as an important vector of nutrient and energy transfer to both primary producers and consumers in marine landscapes, regardless of their levels of productivity and resource availability.
Keyword Food webs
Trophic subsidies
Posidonia
Ecklonia
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Online publication date: 20 January 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
School of Biological Sciences Publications
 
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