Autochthonous and allochthonous contributions to mesozooplankton diet in a tidal river and estuary: Integrating carbon isotope and fatty acid constraints

Meersche, Karel Van den; Rijswijk, Pieter van; Soetaert, Karline; Middelburg, Jack J.

doi:10.4319/lo.2009.54.1.0062

Cited by 78 publications

(69 citation statements)

References 52 publications

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“…The enrichment in 13 C of carbohydrates and depletion in 13 C of lipids relative to total cells (mainly amino acids) has been shown in culture studies of phytoplankton (Van Dongen et al, 2002) and of several primary producers and consumers (Teece and Fogel, 2007). Results of this study show that the enrichment in 13 C in glucose as well as the 13 C-depletion in in fatty acids relative to bulk material can also be detected in field samples (Fig.…”

Section: Carbohydrates and Lipid δ 13 Csupporting

confidence: 53%

“…In laboratory studies, the offset between lipids and bulk material has been shown to be variable (van Dongen et al, 2002, Fiorini et al, 2010. One can expect that in field studies, with multiple species, however, these cellular variations would probably disappear within broader trends.…”

Section: Phytoplankton δ 13 Cmentioning

confidence: 99%

“…Groups of phytoplankton and bacteria have different fatty acid (FA) compositions, so by analysing the δ 13 C of specific FA, the δ 13 C of phytoplankton and bacteria can be inferred. The combined use of stable isotopes and FA biomarkers has been successfully applied to study autochthonous and allochthonous carbon contributions to zooplankton in a tidal river (Van den Meersche et al, 2009). Few studies have applied CSIA to study carbon flows in plankton food webs in lakes.…”

Section: Introductionmentioning

confidence: 99%

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Stable carbon isotope biogeochemistry of lakes along a trophic gradient

et al. 2014

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Abstract. The stable carbon (C) isotope variability of dissolved inorganic and organic C (DIC and DOC), particulate organic carbon (POC), glucose and polar-lipid derived fatty acids (PLFAs) was studied in a survey of 22 North American oligotrophic to eutrophic lakes. The δ 13 C of different PLFAs were used as proxy for phytoplankton producers and bacterial consumers. Lake pCO 2 was primarily determined by autochthonous production (phytoplankton biomass), especially in eutrophic lakes, and governed the δ 13 C of DIC. All organic-carbon pools showed overall higher isotopic variability in eutrophic lakes (n = 11) compared to oligomesotrophic lakes (n = 11) because of the high variability in δ 13 C at the base of the food web (both autochthonous and allochthonous carbon). Phytoplankton δ 13 C was negatively related to lake pCO 2 over all lakes and positively related to phytoplankton biomass in eutrophic lakes, which was also reflected in a large range in photosynthetic isotope fractionation (ε CO 2 −phyto , 8-25 ‰). The carbon isotope ratio of allochthonous carbon in oligo-mesotrophic lakes was rather constant, while it varied in eutrophic lakes because of maize cultivation in the watershed.

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Section: Carbohydrates and Lipid δ 13 Csupporting

confidence: 53%

Section: Phytoplankton δ 13 Cmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stable carbon isotope biogeochemistry of lakes along a trophic gradient

et al. 2014

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“…However, POM is composed by both phytoplankton and detritus or different origins (both aquatic and terrestrial), and it can be difficult to separate the contributions of the two, although the latter can be constrained using for example chlorophyll a:POC ratios or POC:PN ratios (e.g., Kendall et al 2001). On the other hand, zooplankton feeds both on the detritus and algae fractions of POM, but in a selective manner, depending on the relative abundance of these sources (Cole et al 2006, Van den Meersche et al 2009). A similar situation occurs in the benthic food chains, where benthic algae and organic matter of different origins are differentially assimilated by phytodetritivorous species (D'Avanzo and Valiela 1990).…”

Section: Introductionmentioning

confidence: 85%

Importance of terrestrial subsidies for estuarine food webs in contrasting East African catchments

et al. 2013

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Abstract. Little is known on the degree to which terrestrial organic matter delivered to tropical estuaries contributes to estuarine consumers. Here, stable isotope analysis is used to constrain this contribution for contrasting east African estuaries whose catchments differ in relative C3/C4 vegetation cover. As these two types of vegetation differ strongly in d 13 C, we anticipated that terrestrial subsidies would be reflected in a gradient in estuarine consumer d13 C values, following the relative importance of C3 (characterised by low consumer trophic guilds, confirming the incorporation of organic material transported from the catchments by estuarine consumers, and implying that this material is transported up to high trophic level fish. Bayesian mixing models confirmed that C4 material was the most important source for the highly turbid, C4-dominated estuaries, contributing up to 61-91% (95% CI) to phytodetritivorous fish in the Betsiboka, whereas for the less turbid C3-dominated estuaries terrestrial subsidies were not as important and consumers relied on a combination of terrestrial and aquatic sources. This shows that the ecology of the overall catchment affects the estuaries at the most basic, energetic level, and activities that alter the turbidity and productivity of rivers and estuaries can affect food webs well beyond the area of impact.

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“…In addition, the isotopic signature of a consumer could result from consumption of a single food source, but more realistically usually reflects consumption of a mixture of §2 food sources. One way to gain a better understanding of the relative importance of basal food sources in food webs is to combine analysis of stable-isotopic composition with analysis of phospholipid-derived fatty acid (PLFA) composition (Kharlamenko et al 2001, Perga et al 2006, Van den Meersche et al 2009). The PLFA approach is based on the specific PLFA composition of bacteria and algae and on the inability of animals to synthesize specific PLFAs and essential polyunsaturated fatty acids (PUFAs; Kharlamenko et al 2001).…”

mentioning

confidence: 99%