Benthic trophic dynamics in California coastal basin and continental slope communities inferred using inverse analysis

Eldridge, PM; Jackson, GA

doi:10.3354/meps099115

Cited by 36 publications

(16 citation statements)

References 28 publications

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“…If S is 100%, a 20% increase in the parameter caused a 20% increase in A. For S > 100%, the change in A is disproportionately large relative to the change in the input parameter (Fasham et al 1990, Eldridge & Jackson 1993.…”

Section: Plant Measurementsmentioning

confidence: 99%

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Utilization of DOC from seagrass rhizomes by sediment bacteria: 13C-tracer experiments and modeling

Kaldy

Eldridge²,

Cifuentes³

et al. 2006

Mar. Ecol. Prog. Ser.

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Seagrasses are widely recognized as contributing to net ecosystem primary production and to supporting heterotrophy in estuarine systems. We investigated the linkage between seagrass (Thalassia testudinum) rhizosphere carbon exudation and sediment bacteria. In microcosms, we simulated summer conditions and enriched the water column DIC (dissolved inorganic carbon) pool with 13 C, then followed the tracer into the sediment porewater DOC (dissolved organic carbon) and the bacterial biomarkers (phospholipid fatty acids, PLFAs). Subsequently, we developed an inverse analysis of the seagrass microcosm system and calculated the flux of carbon between biological and geochemical compartments. After 18 d, the bacterial pool was enriched by about Δ + 4 ‰, while the DOC pool was enriched by about Δ + 50 to + 60 ‰. We estimate that about 15 to 30% of gross primary production was exuded from the root/rhizome and that this accounts for about 41 to 61% of the carbon required by sediment bacteria. Mineralization of detrital seagrass leaf material or refractory seagrass DOC rhizodeposition may account for the other 38 to 59% of the bacterial carbon demand. We suggest that the sediment bacteria in the seagrass rhizosphere rapidly utilize labile DOC and, consequently, build up 13 C label in the refractory DOC pool. Our results conclusively show a direct linkage between seagrass carbon exudation and sediment biogeochemical processes.

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Section: Plant Measurementsmentioning

confidence: 99%

“…Respiration was a consistently available output variable for seagrass and bacteria, and is a measure of carbon utilization by an organism or plant organ (Eldridge & Jackson 1993). The second response measure is based on the root-mean-squared difference (RMSD), also referred to as the standard deviation (Zar 1984, his Eq.…”

Section: Plant Measurementsmentioning

confidence: 99%

Utilization of DOC from seagrass rhizomes by sediment bacteria: 13C-tracer experiments and modeling

Kaldy

Eldridge²,

Cifuentes³

et al. 2006

Mar. Ecol. Prog. Ser.

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“…Vézina & Platt (1988) adapted an inverse approach to describe a marine food web, analyzing food-web dynamics along the British coast. Their approach has been used to describe carbon and nitrogen flow in a wide range of marine and limnetic environments since then, including the North Pacific (Vézina & Savenkoff 1999), an atoll lagoon (Niquil et al 1998(Niquil et al , 1999, both planktonic (Jackson & Eldridge 1992) and benthic (Eldridge & Jackson 1993) communities in Southern California, the Baltic Sea (Donali et al 1999) and a Michigan lake (Vézina & Pace 1994).…”

Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

Sedimentation, carbon export and food web structure in the Mississippi River plume described by inverse analysis

Breed

Jackson²,

Richardson³

2004

Mar. Ecol. Prog. Ser.

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“…Linear inverse modeling is a data assimilation method that allows integrating carbon process and biomass data to quantify elemental flows in food webs (Vézina and Platt 1988;) and has proved to be useful to infer carbon flows in benthic food webs (Eldridge and Jackson 1993;Van Oevelen et al 2006). In most benthic food web studies, however, it is common to lump all types of detritus into one compartment, thus neglecting detritus quality differences (Rowe et al 2008).…”

mentioning

confidence: 99%

Carbon flows in the benthic food web of the Porcupine Abyssal Plain: The (un)importance of labile detritus in supporting microbial and faunal carbon demands

Oevelen

Soetaert

Heip

2012

Limnology & Oceanography

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Carbon flows in the benthic food web of the Porcupine Abyssal Plain (4850 m, northeast Atlantic) were reconstructed using linear inverse modeling based on mass balances of the various compartments, biomass data, carbon flux measurements, physiological constraints, and data from a previously published 13 C-phytodetritus pulse-chase experiment. Food web compartments consisted of bacteria, Foraminifera, three feeding types of nematodes and of macrofauna, and four feeding types of megafauna. Three lability classes of detritus were defined to clarify especially the possible role of labile detritus in this abyssal plain food web. Total detritus inputs to the food web were 0.56 mmol C m 22 d 21 , with only a minor (3.8%) contribution of labile detritus. The dominant pathway in the food web was dissolution of more refractory detritus, uptake by bacteria, and subsequent respiration (0.36 mmol C m 22 d 21 , 80% of the community respiration). Lower contributions to community respiration were found for surface-deposit-feeding macrobenthos (5.6%), Foraminifera (4.9%), predatory macrobenthos (3.8%), and other deposit-feeding macrobenthos (3.1%). Contributions by other benthic compartments were , 1%. 13 C-phytodetritus transfer data strongly constrained the carbon source for bacteria, Foraminifera, and the nematode and macrobenthic compartments. Surprisingly, labile detritus contributed , 5% of the total carbon requirements for all these compartments. Carbon sources were much less constrained for the megabenthic compartments because for these compartments no 13 C pulse-chase data were available. The carbon flow model evidently shows a limited role of labile detritus in the food web.

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Benthic trophic dynamics in California coastal basin and continental slope communities inferred using inverse analysis

Cited by 36 publications

References 28 publications

Utilization of DOC from seagrass rhizomes by sediment bacteria: 13C-tracer experiments and modeling

Utilization of DOC from seagrass rhizomes by sediment bacteria: 13C-tracer experiments and modeling

Sedimentation, carbon export and food web structure in the Mississippi River plume described by inverse analysis

Carbon flows in the benthic food web of the Porcupine Abyssal Plain: The (un)importance of labile detritus in supporting microbial and faunal carbon demands

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