Determining spatial changes in the diet of nearshore suspension-feeders along the South African coastline: Stable isotope and fatty acid signatures

Allan, Elizabeth Louise; Ambrose, Shan T.; Richoux, Nicole B.; Froneman, P. W.

doi:10.1016/j.ecss.2010.02.004

Cited by 69 publications

(49 citation statements)

References 45 publications

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“…Of the prey groups in Fig. 4, tropical thraustochytrids (mean 25.5% TFA; Lee Chang et al 2011, Lee Chang et al 2012, suspended particulate matter (7.6% TFA; Cotonnec et al 2001, Allan et al 2010) and brachyuran eggs (6.9% TFA; Figueiredo & Narciso 2008, Torres et al 2008 were the only groups with higher concentrations of bacterial FA than whale sharks. While brachyuran larvae are part of the diet of at least some whale sharks (Meekan et al 2009), suspended particulate matter could be ingested by whale sharks in large quantities when filter-feeding.…”

Section: Feeding At Nightmentioning

confidence: 99%

Diet of whale sharks Rhincodon typus inferred from stomach content and signature fatty acid analyses

Rohner¹,

Couturier²,

Richardson³

et al. 2013

Mar. Ecol. Prog. Ser.

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Section: Feeding At Nightmentioning

confidence: 99%

Diet of whale sharks Rhincodon typus inferred from stomach content and signature fatty acid analyses

Rohner¹,

Couturier²,

Richardson³

et al. 2013

Mar. Ecol. Prog. Ser.

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“…upwelling cell in southern Africa (Allan et al, 2010). When considering the overall δ 13 C pattern of conspicuous species of suspension feeders and the outputs of the mixing model, the trophic influence of the upwelling seemed to reach its southeastern limit between sites 4 and 6, west of the very shallow (< 5 m) north-south-oriented sand banks.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Trophic connectivity between offshore upwelling and the inshore food web of Banc d'Arguin (Mauritania): New insights from isotopic analysis

Carlier

Chauvaud

Geest

et al. 2015

Estuarine, Coastal and Shelf Science

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M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT2 ABSTRACT Banc d'Arguin (BA), Mauritania, is a nationally protected shallow gulf > 10,000 km 2 between the Sahara desert and the upwelling system off the Mauritanian coast. In the southeast, BA consists of a 500 km 2 tidal flat, the most important wintering site for shorebirds using the East Atlantic Flyway. The Mauritanian upwelling-driven phytoplankton production supports the most productive fisheries worldwide, but little is known about its trophic role in the functioning of the inshore BA food web. Using stable isotopes as trophic tracers to distinguish between upwelling-driven phytoplankton, open ocean phytoplankton, and benthic primary producers, we assessed the spatial extent to which the inshore BA food web is fuelled by upwelling-driven phytoplankton production. The δ 13 C and δ 15 N signals were characterized in dominant primary producers, benthic invertebrate taxa, and various fish species along an offshore-inshore (northwest-southeast) gradient. We also monitored the spatial and temporal extent of upwelling entering BA during 2008 with remote sensing of sea surface temperature and chlorophyll a data. The results suggest that benthic invertebrates and fishes living in the northwestern part of BA depend on the nearby upwelling phytoplankton production, but this food source does not support the intertidal benthic community in southeast BA. Furthermore, the isotopic signatures of fishes suggest weak trophic connectivity between the northern subtidal and southeastern intertidal BA. Our results support the hypothesis that the southeastern tidal flat region functions as a distinct ecosystem with a food web supported mainly by local benthic primary production, which is crucial knowledge for effective management of the pristine BA national park.

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“…This study also used cluster analysis but this time the scores were grouped by single linkage cluster analysis in order to determine which should be encircled in the graphic representation. Allan et al [117] used one-way analysis of variance (ANOVA) for the same purpose and showed spatial changes in mussel diets.…”

Section: Multivariate Data Analysismentioning

confidence: 99%

“…We have used PCA to determine marine, terrestrial, and anthropogenic organic inputs, and trophic relationships (e.g., [100,102,104,[112][113][114]). Fatty acid PCA continues to have a strong following [115][116][117], but more sophisticated multivariate statistical analyses are emerging too (see below).…”

Section: Multivariate Data Analysismentioning

confidence: 99%

Lipids in Marine Ecosystems

2013

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Lipids provide the densest form of energy in marine ecosystems. They are also a solvent and absorption carrier for organic contaminants and thus can be drivers of pollutant bioaccumulation. Among the lipids, certain essential fatty acids and sterols are considered to be important determinants of ecosystem health and stability. Fatty acids and sterols are also susceptible to oxidative damage leading to cytotoxicity and a decrease in membrane fluidity. The physical characteristics of biological membranes can be defended from the influence of changing temperature, pressure, or lipid peroxidation by altering the fatty acid and sterol composition of the lipid bilayer. Marine lipids are also a valuable tool to measure inputs, cycling, and loss of materials. Their heterogeneous nature makes them versatile biomarkers that are widely used in marine trophic studies, often with the help of multivariate statistics, to delineate carbon cycling and transfer of materials. Principal components analysis has a strong following as it permits data reduction and an objective interpretation of results, but several more sophisticated multivariate analyses which are more quantitative are emerging too. Integrating stable isotope and lipid data can facilitate the interpretation of both data sets and can provide a quantitative estimate of transfer across trophic levels.

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Determining spatial changes in the diet of nearshore suspension-feeders along the South African coastline: Stable isotope and fatty acid signatures

Cited by 69 publications

References 45 publications

Diet of whale sharks Rhincodon typus inferred from stomach content and signature fatty acid analyses

Diet of whale sharks Rhincodon typus inferred from stomach content and signature fatty acid analyses

Trophic connectivity between offshore upwelling and the inshore food web of Banc d'Arguin (Mauritania): New insights from isotopic analysis

Lipids in Marine Ecosystems

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