Combined lipid, fatty acid and digestive tract content analyses: a penetrating approach to estimate feeding modes of Antarctic amphipods

Graeve, Martín; Dauby, Patrick; Scailteur, Yves

doi:10.1007/s003000100295

Cited by 99 publications

(18 citation statements)

References 33 publications

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“…Macroalgae, like S. fluitans, are often characterized by distinct FA compositions affecting organisms of higher trophic levels. This makes them a useful biomarker to reveal information about food webs (Graeve et al, 2001). Unfortunately, the FA composition of the S. fluitans samples was not consistent, thus no specific FA or a distinct composition could be detected.…”

Section: Fatty Acids (Fa) Analysismentioning

confidence: 99%

Potential contribution of surface-dwelling Sargassum algae to deep-sea ecosystems in the southern North Atlantic

Baker

Minzlaff

Schoenle

et al. 2018

Deep Sea Research Part II: Topical Studies in Oceanography

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Deep-sea ecosystems, limited by their inability to use primary production as a source of carbon, rely on other sources to maintain life. Sedimentation of organic carbon into the deep sea has been previously studied, however, the high biomass of sedimented Sargassum algae discovered during the VEMA Transit expedition in 2014/2015 to the southern North Atlantic, and its potential as a regular carbon input, has been an underestimated phenomenon. To determine the potential for this carbon flux, a literature survey of previous studies that estimated the abundance of surface water Sargassum was conducted. We compared these estimates with quantitative analyses of sedimented Sargassum appearing on photos taken with an autonomous underwater vehicle (AUV) directly above the abyssal sediment during the expedition. Organismal communities associated to Sargassum fluitans from surface waters were investigated and Sargassum samples collected from surface waters and the deep sea were biochemically analyzed (fatty acids, stable isotopes, C:N ratios) to determine degradation potential and the trophic significance within deep-sea communities. The estimated Sargassum biomass (fresh weight) in the deep sea (0.07-3.75 g/m 2) was several times higher than that estimated from surface waters in the North Atlantic (0.024-0.84 g/m 2). Biochemical analysis showed degradation of Sargassum occurring during sedimentation or in the deep sea, however, fatty acid and stable isotope analysis did not indicate direct trophic interactions between the algae and benthic organisms. Thus, it is assumed that components of the deep-sea microbial food web form an important link between the macroalgae and larger benthic organisms. Evaluation of the epifauna showed a diverse nano-micro-, meio, and macrofauna on surface Sargassum and maybe transported across the Atlantic, but we had no evidence for a vertical exchange of fauna components. The large-scale sedimentation of Sargassum forms an important trophic link between surface and benthic production and has to be further considered in the future as a regular carbon input to the deep-sea floor in the North Atlantic.

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Section: Fatty Acids (Fa) Analysismentioning

confidence: 99%

Potential contribution of surface-dwelling Sargassum algae to deep-sea ecosystems in the southern North Atlantic

Baker

Minzlaff

Schoenle

et al. 2018

Deep Sea Research Part II: Topical Studies in Oceanography

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“…2006). Therefore, we encourage FATM analyses as the intermediate way between biased short-term gut content studies and rather unspecific long-term stable isotope analyses, to evaluate complex dietary preferences and to explore competition for food in co-occurring crabs (Graeve et al 2001, Latyshev et al 2004, Griffen 2014. Except for Rhodophyta, all dietary indices of algae were higher in H. sanguineus, indicating a higher level of herbivory.…”

Section: Dietary Preferencesmentioning

confidence: 99%

“…These biases can be eliminated by applying the fatty acid trophic marker (FATM) concept. The composition of fatty acids (FAs) integrates trophic preferences over a longer time period of days to weeks, compared to gut content analyses (Graeve et al 2001, Dalsgaard et al 2003, Latyshev et al 2004.…”

Section: Introductionmentioning

confidence: 99%

Seasonal lipid storage and dietary preferences of native European vs. invasive Asian shore crabs

Jungblut¹,

McCarthy²,

Boos³

et al. 2018

Mar. Ecol. Prog. Ser.

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The invasive Asian shore crab Hemigrapsus sanguineus and the native European green crab Carcinus maenas share intertidal habitats along European North Atlantic shores and may compete for food. We evaluated the energy-storing capacities of the 2 species and determined their dietary preferences by means of lipid analysis and fatty acid trophic marker indices. Specimens of both sexes and various sizes were sampled in the rocky intertidal of the island of Helgoland (North Sea) in April, June, August, and October 2015. Total lipids of the midgut glands were significantly higher in H. sanguineus than in C. maenas and followed a distinct seasonal cycle in both sexes (ca. 20−50% of dry mass, DM). The lower lipid contents of C. maenas (ca. 20% of DM) remained at a similar level throughout the seasons. The seasonal differences in the females of H. sanguineus may be due to higher reproductive output and, consequently, lipid turnover, but remain unexplained in males. Trophic indices for Bacillariophyceae, Chlorophyta, and especially Phaeophyceae were higher in H. sanguineus than in C. maenas, suggesting a higher degree of herbivory of the invader. In contrast, the Rhodophyta index was higher in C. maenas. Thus, competition for food between the 2 species will probably be low in habitats rich in macroalgae. The ability of H. sanguineus to utilize mainly energy-poor algae but accumulate high-energy reserves may be an advantage for successfully establishing persistent populations in new habitats.

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“…According to graeve et al (2001), triacylglycerols and to a lesser extent phospholipids predominate in Charcotia. graeve et al (2001) andnySSen et al (2005) indicated that 18:1(n-9) fatty acids (i.e., oleic acid) accounted for >44% of total fatty acids of Charcotia spp. As far as we know, oleic acid combined in triacylglycerols or phospholipids cannot be the cause of gastrointestinal disturbances.…”

Section: Digestibility Of Charcotia For Humans and Other Vertebratesmentioning

confidence: 99%

The genus Charcotia Chevreux, 1906 in the Southern Ocean, with the description of a new species (Crustacea, Amphipoda, Lysianassoidea)

2018

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It is demonstrated here that Charcotia Chevreux, 1906 (Amphipoda) has priority over Charcotia Vayssière, 1906 (Gastropoda), and that Waldeckia Chevreux, 1906 has to be treated as an invalid objective junior synonym of Charcotia Chevreux, 1906. An analysis of a part of the mitochondrial COI gene of Charcotia indicates that Charcotia obesa sensu lato, consists of two genetically distant clades that fulfil the criteria of genetic species. Each genetic clade corresponds to a different morphotype. The first one has a low triangular protrusion on the dorsal border of urosomite 1, a strong tooth on epimeron 3, and the posterodistal corner of the basis of pereiopod 7 is regularly rounded. It agrees with the original description of Charcotia obesa Chevreux, 1906. The second one has a protrusion of urosomite 1 prolongated by a sharp and usually long denticle, a small tooth on epimeron 3, and the posterodistal corner of the basis of pereiopod 7 is bluntly angular. The second form is treated herein as a new species, Charcotia amundseni sp. nov., which is described in detail. While the bathymetric distribution of the two Antarctic Charcotia species overlaps (0–300 m for C. obesa and 7–1200 m for C. amundseni sp. nov.), C. obesa largely predominates at depths of less than 150 m, while Charcotia amundseni sp. nov. predominates at greater depths. Both species are widely distributed and presumably circum-Antarctic.

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Combined lipid, fatty acid and digestive tract content analyses: a penetrating approach to estimate feeding modes of Antarctic amphipods

Cited by 99 publications

References 33 publications

Potential contribution of surface-dwelling Sargassum algae to deep-sea ecosystems in the southern North Atlantic

Potential contribution of surface-dwelling Sargassum algae to deep-sea ecosystems in the southern North Atlantic

Seasonal lipid storage and dietary preferences of native European vs. invasive Asian shore crabs

The genus Charcotia Chevreux, 1906 in the Southern Ocean, with the description of a new species (Crustacea, Amphipoda, Lysianassoidea)

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