Diet insights of deep-sea polychaetes derived from fatty acid analyses

Würzberg, Laura; Peters, Janna; Schüller, Myriam; Brandt, Angelika

doi:10.1016/j.dsr2.2010.10.014

Cited by 55 publications

(37 citation statements)

References 81 publications

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“…It has been suggested that high levels of 20:4(n-6) in amphipods come from macroalga ingestion (Graeve et al, 2001;Nyssen et al, 2005). This FA, however, is also important in many foraminiferan species (Gooday et al, 2002;Suhr et al, 2003); thus, elevated levels of it in macrobenthic taxa might also be attributed to feeding on Foraminifera (Würzberg et al, 2011). Considering the results of gut content analysis and the fact that macroalgal vegetation is not found in the muddy habitats populated by A. phyllonyx, it is more probable that high levels of 20:4(n-6) originates from foraminiferans.…”

Section: Feeding Strategiesmentioning

confidence: 94%

When season does not matter: summer and winter trophic ecology of Arctic amphipods

2012

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Polar marine ecosystems' functioning is known to be strongly affected by the seasonality of water column production. However, a response of benthic organisms may range from close coupling to total decoupling from seasonal variability of environmental processes, depending on a feeding strategy. In this study, we used a multi-method approach (gut content, lipid and stable isotope analyses) to examine trophic ecology and major food sources of a large set of Arctic sub-littoral amphipods, and to evaluate whether their feeding strategies undergo seasonal changes. The wide range of d 15 N values (5.45-12.43%) indicates that amphipods form a trophic continuum from primary herbivores to carnivores/ scavengers. Three main feeding modes, namely scavenging/predatory, deposit-feeding/predatory and phytodetrivory, were distinguished based on the multivariate analysis of whole fatty acid profiles. Total lipid content was low in all species and included primarily short-term energy reserves of triacylglycerols. In general, amphipods feeding habits appeared to be independent of the seasonal phytodetritial pulses. Low reliance on lipid reserves and lack of major changes in the trophic strategies over time suggest that these crustaceans feed continuously, taking advantage of a variety of food sources that are available yearround in shallow polar waters.

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Section: Feeding Strategiesmentioning

confidence: 94%

When season does not matter: summer and winter trophic ecology of Arctic amphipods

2012

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“…For example, 16:1ω7 has been linked to sulfur-cycling pathways (Colaço et al, 2007) and comprised 14.0-15.2 % of abundance at nonhydrothermal sites and 20.0-23.5 % at hydrothermal sites. However, 18:1ω7, also a suggested PLFA linked to thiooxidation (McCaffrey et al, 1989;Colaço et al, 2007) occurred in lower abundance at hydrothermal sites (4.8-11.1 %) than non-hydrothermal sites (15.9-16.9 %) and was also abundant in deeper areas of the Antarctic shelf (Würzberg et al, 2011). Heavier carbon isotopic signatures (> −15 ‰) are generally associated with rTCA cycle carbon fixation (Hayes, 2001;Hugler and Sievert, 2011;Reid et al, 2013), suggesting that this pathway may have been active at the hydrothermal sites, albeit at probably quite low rates.…”

Section: Microbial Signatures Of Hydrothermal Activitymentioning

confidence: 99%

“…Although the FA suite was indicative of active sulfur-cycling activity, it remains difficult to be conclusive about the origin of most FAs, even those which have been regularly observed in chemosynthetic contexts (e.g. 18:1ω7) and may still be abundant elsewhere (Würzberg et al, 2011). Together, C16:1ω7c and C18:1ω7 accounted for ∼ 25-35 % of the total FA suite and although they can be more generally associated with gram-negative eubacteria, they have frequently been linked to sulfur-oxidising bacteria in sediment samples (Pond et al, 1998;Yamanaka and Sakata, 2004;Boschker et al, 2014).…”

Section: Microbial Signatures Of Hydrothermal Activitymentioning

confidence: 99%

Hydrothermal activity lowers trophic diversity in Antarctic hydrothermal sediments

et al. 2017

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Abstract. Hydrothermal sediments are those in which hydrothermal fluid is discharged through sediments and are one of the least studied deep-sea ecosystems. We present a combination of microbial and biochemical data to assess trophodynamics between and within hydrothermal and background areas of the Bransfield Strait (1050-1647 m of depth). Microbial composition, biomass, and fatty acid signatures varied widely between and within hydrothermally active and background sites, providing evidence of diverse metabolic activity. Several species had different feeding strategies and trophic positions between hydrothermally active and inactive areas, and the stable isotope values of consumers were not consistent with feeding morphology. Niche area and the diversity of microbial fatty acids was lowest at the most hydrothermally active site, reflecting trends in species diversity. Faunal uptake of chemosynthetically produced organics was relatively limited but was detected at both hydrothermal and non-hydrothermal sites, potentially suggesting that hydrothermal activity can affect trophodynamics over a much wider area than previously thought.

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“…The ecology and role of deep-sea fauna in trophodynamic coupling and nutrient cycling in oceanic ecosystems, however, are still poorly understood fora most taxa (e.g., Würzberg et al, 2011a). Another unanswered question is why we find few species at many stations, but many species at a single station or at few localities.…”

Section: Introductionmentioning

confidence: 96%