Long overdue improvement of box corer sampling

Blomqvist, Sven; Ekeroth, Nils; Elmgren, Ragnar; Hall, Per

doi:10.3354/meps11405

Cited by 18 publications

(17 citation statements)

References 48 publications

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“…Intact and undisturbed sediment samples were collected from 149 m depth with a modified boxcorer that minimizes resuspension (Blomqvist et al 2015) in the northwestern Baltic proper (58°26.2095′N, 18°25.3751′E) in August 2012 onboard R/V Fyrbyggaren. Retrieved sediment boxes (area: 30 × 30 cm) had a sediment height of ca.…”

Section: Sampling For Sediment and Macrofaunamentioning

confidence: 99%

Sulfide oxidation in deep Baltic Sea sediments upon oxygenation and colonization by macrofauna

et al. 2019

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Coastal and shelf sediments affected by transient or long-term bottom water anoxia and sulfidic conditions undergo drastic changes in macrofauna communities and abundances. This study investigates how early colonization by two macrofaunal functional traits (epifauna vs. infauna) affects oxygen, sulfide, and pH dynamics in anoxic sediment upon recent bottom water oxygenation. Large mesocosms (area 900 cm 2) with 150-m-deep Baltic Sea soft sediments were exposed to three treatments: (1) no animals; (2) addition of 170 polychaetes (Marenzelleria arctia); (3) addition of 181 amphipods (Monoporeia affinis). Porewater chemistry was investigated repeatedly by microsensor profiling over a period of 65 days. Colonization by macrofauna did not significantly deepen penetration of oxygen compared to the animal-free sediment. Bioturbation by M. affinis increased the volume of the oxidized, sulfide-free sediment by 66% compared to the animal-free control already after 13 days of incubation. By the end of the experiment M. affinis and M. arctia increased the oxidized sediment volume by 87 and 35%, respectively. Higher efficiency of epifaunal amphipods in removing hydrogen sulfide than deep-burrowing polychaetes is likely due to more substantial re-oxidation of manganese and/or nitrogen compounds associated with amphipod mixing activity. Our results thus indicate that early colonization of different functional groups might have important implications for the later colonization by benthic macrofauna, meiofauna and microbial communities that benefit from oxidized and sulfide-free sediments.

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Section: Sampling For Sediment and Macrofaunamentioning

confidence: 99%

Sulfide oxidation in deep Baltic Sea sediments upon oxygenation and colonization by macrofauna

et al. 2019

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“…At each station, bottom water (3-5 m above the seafloor) was sampled via a Rosette sampler carrying 10 l Niskin bottles. Sediment was sampled via a modified box corer (W × D × H: 28 cm × 28 cm × 50 cm) that allowed the retrieval of soft sediment with minimal disturbance (Blomqvist et al, 2015). On deck, the sediment in the box core was subsampled with PVC core liners (length: 30 cm, inner diameter: 6.0 cm), and subsequently sediment cores were transferred into an aquarium containing bottom water at in situ temperature.…”

Section: Sediment Sampling and Incubationsmentioning

confidence: 99%

Transient bottom water oxygenation creates a niche for cable bacteria in long‐term anoxic sediments of the Eastern Gotland Basin

Marzocchi

Bonaglia

Velde

et al. 2018

Environmental Microbiology

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Cable bacteria have been reported in sediments from marine and freshwater locations, but the environmental factors that regulate their growth in natural settings are not well understood. Most prominently, the physiological limit of cable bacteria in terms of oxygen availability remains poorly constrained. In this study, we investigated the presence, activity and diversity of cable bacteria in relation to a natural gradient in bottom water oxygenation in a depth transect of the Eastern Gotland Basin (Baltic Sea). Cable bacteria were identified by FISH at the oxic and transiently oxic sites, but not at the permanently anoxic site. Three species of the candidate genus Electrothrix, i.e. marina, aarhusiensis and communis were found coexisting within one site. The highest filament density (33 m cm ) was associated with a 6.3 mm wide zone depleted in both oxygen and free sulphide, and the presence of an electric field resulting from the electrogenic sulphur oxidizing metabolism of cable bacteria. However, the measured filament densities and metabolic activities remained low overall, suggesting a limited impact of cable bacteria at the basin level. The observed bottom water oxygen levels (< 5 μM) are the lowest so far reported for cable bacteria, thus expanding their known environmental distribution.

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“…The box corer used for collecting sediments has been documented in situ to collect high quality soft sediment boxcores (Blomqvist et al 2015). During the lander deployment, 9 boxcosms were collected at 149 m water depth close to the lander station.…”

Section: Collection Of Sediment Boxcosmsmentioning

confidence: 99%

Nutrient fluxes from reduced Baltic Sea sediment: effects of oxygenation and macrobenthos

Ekeroth¹,

Blomqvist²,

Hall³

2016

Mar. Ecol. Prog. Ser.

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Effects of bottom water oxygenation and macrofaunal colonisation on benthic fluxes of nitrogen (N), phosphorus (P) and silicon (Si) from long-term anoxic Baltic Sea bottom sediment were investigated. Sediment boxcosms from an anoxic site at 150 m depth in the open Baltic proper were incubated in the laboratory to follow the development of benthic nutrient fluxes during 74 d exposure to flow-through of oxygen-rich water. In contrast to traditional end-point experimental designs, our repeated measurement approach allowed for separation of transient and long-term effects of oxygenation and bioturbation on benthic nutrient recycling. The composition, but not the rate, of the benthic total dissolved N efflux changed by oxygenation from being dominated by NH 4 in situ to being mostly composed of NO 2 + NO 3 and dissolved organic N (DON) under oxic conditions. Oxygenation in the boxcosms decreased the benthic efflux of dissolved silicate (DSi) and essentially shut off the in situ flux of dissolved inorganic phosphorus (DIP). After 20 d of oxygenation, 2 bottom macrofauna taxa, the polychaete Marenzelleria spp. and the amphipod Monoporiea affinis, were introduced to a subset of the boxcosms. Bioturbation by either taxa increased the efflux of dissolved inorganic N (DIN), DON and DSi to the overlying water. The Prich benthic flux under in situ anoxic conditions roughly approached Redfield N:P stoichiometry after oxygenation in the sediment boxcosms. Upon addition of macrofauna, bioturbation generated even higher N:P flux ratios.

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Long overdue improvement of box corer sampling

Cited by 18 publications

References 48 publications

Sulfide oxidation in deep Baltic Sea sediments upon oxygenation and colonization by macrofauna

Sulfide oxidation in deep Baltic Sea sediments upon oxygenation and colonization by macrofauna

Transient bottom water oxygenation creates a niche for cable bacteria in long‐term anoxic sediments of the Eastern Gotland Basin

Nutrient fluxes from reduced Baltic Sea sediment: effects of oxygenation and macrobenthos

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