2013
DOI: 10.4319/lo.2013.58.6.1985
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Seasonal and diel patterns in sedimentary flux of krill fecal pellets recorded by an echo sounder

Abstract: We used a moored upward-facing 200 kHz echo sounder to address sedimentation of fecal pellets (FPs) from dielly migrating Meganyctiphanes norvegica. The echo sounder was located on the bottom at 150 m depth in the Oslofjord, Norway, and was cabled to shore for continuous measurements during winter and spring. Records of sinking pellets were for the first time observed with an echo sounder. Seasonal patterns of sedimentation of krill FPs were strongly correlated with data from continuous measurement of fluoresc… Show more

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Cited by 10 publications
(10 citation statements)
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“…Below this depth and after defecation, the fast sinking fecal pellets would reinforce the already weakened gravitational flux coming from surface, bypassing carbon from active to passive flux at mesopelagic depths (see Alonso-González et al, 2013). At this point, there are also important differences between zooplankton and micronekton since larger animals produce larger fecal pellets, which are expected to sink faster and to reach greater depths before decomposition (Small et al, 1979;Robison and Bailey, 1981;Røstad and Kaartvedt, 2013). Other exporting mechanisms such as the carbon inputs via excretion (Steinberg et al, 2000) and mortality still remain to be considered.…”
Section: Particularities Of Zooplankton and Micronekton Active Fluxmentioning
confidence: 95%
“…Below this depth and after defecation, the fast sinking fecal pellets would reinforce the already weakened gravitational flux coming from surface, bypassing carbon from active to passive flux at mesopelagic depths (see Alonso-González et al, 2013). At this point, there are also important differences between zooplankton and micronekton since larger animals produce larger fecal pellets, which are expected to sink faster and to reach greater depths before decomposition (Small et al, 1979;Robison and Bailey, 1981;Røstad and Kaartvedt, 2013). Other exporting mechanisms such as the carbon inputs via excretion (Steinberg et al, 2000) and mortality still remain to be considered.…”
Section: Particularities Of Zooplankton and Micronekton Active Fluxmentioning
confidence: 95%
“…Another potential food source available was krill, which were particularly common the current winter (Røstad & Kaartvedt 2013. Although they appear to be too large to be preyed upon by most sprat, krill did occur among the stomach contents for the largest individuals the winter of this study (Solberg et al 2015).…”
Section: Potential Relations To Foodmentioning
confidence: 71%
“…Yet, an increase in measured light levels was apparent in mid-March, with the sprat leaving upper waters nearer to the upcoming sunrise these days. There was a strong build-up of chlorophyll a in mid-March (Røstad & Kaartvedt 2013), so that increased light extinction would cause darker waters relative to surface measurements in this period. The sprat apparently adjusted their timing in upper waters accordingly.…”
Section: Relations To Lightmentioning
confidence: 96%
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“…Transparent exopolymer particles (TEPs) and faecal matter are also components of particulate organic carbon (POC). The former are composed of extracellular polymeric substances exuded by microorganisms (Alldredge et al 1993), while the latter are mainly produced by mesoplanktonic, macroplanktonic (Turner 2015), and micronektonic (Røstad andKaartvedt 2013, Ariza et al 2015) organisms, transporting a fraction of their ingested matter. These compounds are thus all expected to sink together with the mineral and organic particles deposited on the ocean during dust events such as those seen in the Canary Current due to the proximity of the Sahara desert.…”
Section: Introductionmentioning
confidence: 99%