Oxygen depletion under glass: Behavioural responses of benthic macrofauna to induced anoxia in the Northern Adriatic

Riedel, Bettina; Zuschin, Martin; Haselmair, Alexandra; Stachowitsch, Michael

doi:10.1016/j.jembe.2008.08.007

Cited by 80 publications

(75 citation statements)

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“…The dependence of marine organisms on dissolved oxygen concentrations, such as benthic invertebrates and fish, is necessary in the assessment of ecosystem health of marine environments [58]. This is relevant because in the last two decades there has been an increased concern of anthropogenic impacts in coastal areas and severe oxygen deficiencies have been reported in different regions of the world [59].…”

Section: Discussionmentioning

confidence: 99%

The Relationship between Mollusks and Oxygen Concentrations in Todos Santos Bay, Baja California, Mexico

Kuk-Dzul

Díaz‐Castañeda

2016

Journal of Marine Biology

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This study describes the relationship between mollusks, physicochemical properties of seawater, and sediments under natural conditions of low impact. Thirty-nine stations were sampled in October 1994 using a Van Veen grab (0.1 m −2 ). Temperature, salinity, and dissolved oxygen (DO) concentrations of bottom water were obtained with a CTD. Organic matter content and sediment grain analysis were determined. A total of 836 mollusks were collected. Gastropoda was the most abundant (52%) and diverse class with 27 genera, followed by Bivalvia with eight genera and Scaphopoda with only one genus. According to CCA analysis, dominant mollusks were significantly related with high DO concentrations. Donax, Natica, Acteocina, Bulla, Anachis, Odostomia, and Crucibulum can be classified as sensitive genera because they were found mainly in high oxygen concentrations (3.1-5.6 mL L −1 ); on the other hand, Cardiomya, Nuculana, Laevicardium, Chione, Truncatella, and Dentalium can be classified as tolerant genera (1.0-5.6 mL L −1 ). Todos Santos Bay hosts a diverse malacological fauna (36 genera); our results show that the dominant genera were mainly related to high dissolved oxygen concentrations. Mollusks can be a useful tool in environmental monitoring programs related with oxygen depletion in coastal areas.

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Section: Discussionmentioning

confidence: 99%

The Relationship between Mollusks and Oxygen Concentrations in Todos Santos Bay, Baja California, Mexico

Kuk-Dzul

Díaz‐Castañeda

2016

Journal of Marine Biology

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“…In contrast to enclosed incubations, DI 13 C and DI 15 N fluxes could not be quantified. However, lid-removal mitigates against experimentally-induced anoxia, which may occur in low-oxygen environments (Riedel et al, 2008). Mean current speeds were B0.1 m s À 1 across study area (K Oguri pers.…”

Section: Stable-isotope Labelling Experimentsmentioning

confidence: 99%

Macrofauna regulate heterotrophic bacterial carbon and nitrogen incorporation in low-oxygen sediments

2012

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Oxygen minimum zones (OMZs) currently impinge upon 41 million km 2 of sea floor and are predicted to expand with climate change. We investigated how changes in oxygen availability, macrofaunal biomass and retention of labile organic matter (OM) regulate heterotrophic bacterial C and N incorporation in the sediments of the OMZ-impacted Indian continental margin (540-1100 m;. In situ pulse-chase experiments traced 13 C: 15 N-labelled phytodetritus into bulk sediment OM and hydrolysable amino acids, including the bacterial biomarker D-alanine. Where oxygen availability was lowest ([O 2 ] ¼ 0.35 lmol l À 1 ), metazoan macrofauna were absent and bacteria assimilated 30-90% of the labelled phytodetritus within the sediment. At higher oxygen levels ([O 2 ] ¼ 2-15 lmol l À 1 ) the macrofaunal presence and lower phytodetritus retention with the sediment occur concomitantly, and bacterial phytodetrital incorporation was reduced and retarded. Bacterial C and N incorporation exhibited a significant negative relationship with macrofaunal biomass across the OMZ. We hypothesise that fauna-bacterial interactions significantly influence OM recycling in low-oxygen sediments and need to be considered when assessing the consequences of global change on biogeochemical cycles.

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“…In treatments T1 and T2, oxygen stress was possibly reduced by the increased activity of the macrofauna, due to the animals still being able to disturb the surface and oxygenate the underlying sediment. Hypoxia can induce escaping behaviour in benthic fauna, as observed in our intermediate treatments, and increase mortality when more severe (Riedel et al, 2008;Villnäs et al, 2012). Being identified as significant contributors to changes in SCOC, surface-dwelling and low-motility animals are expected to show density patterns similar to those of SCOC itself.…”

Section: Discussionmentioning

confidence: 65%

“…bioturbation and bio-irrigation), and biogeochemical cycling in an intertidal soft-sediment habitat. We hypothesize that sediment deposition reduces oxygen availability to the community underneath, consequently affecting the survival of the macrobenthos and inducing escaping behaviour (Riedel et al, 2008;Villnäs et al, 2012). This may influence biogeochemical cycling by affecting bioturbation or bio-irrigation (Van Colen et al, 2012;Renz and Forster, 2014).…”

Section: Introductionmentioning

confidence: 99%

Functional trait responses to sediment deposition reduce macrofauna-mediated ecosystem functioning in an estuarine mudflat

et al. 2018

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Abstract. Human activities, among which dredging and land use change in river basins, are altering estuarine ecosystems. These activities may result in changes in sedimentary processes, affecting biodiversity of sediment macrofauna. As macrofauna controls sediment chemistry and fluxes of energy and matter between water column and sediment, changes in the structure of macrobenthic communities could affect the functioning of an entire ecosystem. We assessed the impact of sediment deposition on intertidal macrobenthic communities and on rates of an important ecosystem function, i.e. sediment community oxygen consumption (SCOC). An experiment was performed with undisturbed sediment samples from the Scheldt river estuary (SW Netherlands). The samples were subjected to four sedimentation regimes: one control and three with a deposited sediment layer of 1, 2 or 5 cm. Oxygen consumption was measured during incubation at ambient temperature. Luminophores applied at the surface, and a seawater-bromide mixture, served as tracers for bioturbation and bio-irrigation, respectively. After incubation, the macrofauna was extracted, identified, and counted and then classified into functional groups based on motility and sediment reworking capacity. Total macrofaunal densities dropped already under the thinnest deposits. The most affected fauna were surficial and low-motility animals, occurring at high densities in the control. Their mortality resulted in a drop in SCOC, which decreased steadily with increasing deposit thickness, while bio-irrigation and bioturbation activity showed increases in the lower sediment deposition regimes but decreases in the more extreme treatments. The initial increased activity likely counteracted the effects of the drop in low-motility, surficial fauna densities, resulting in a steady rather than sudden fall in oxygen consumption. We conclude that the functional identity in terms of motility and sediment reworking can be crucial in our understanding of the regulation of ecosystem functioning and the impact of habitat alterations such as sediment deposition.

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Oxygen depletion under glass: Behavioural responses of benthic macrofauna to induced anoxia in the Northern Adriatic

Cited by 80 publications

References 50 publications

The Relationship between Mollusks and Oxygen Concentrations in Todos Santos Bay, Baja California, Mexico

The Relationship between Mollusks and Oxygen Concentrations in Todos Santos Bay, Baja California, Mexico

Macrofauna regulate heterotrophic bacterial carbon and nitrogen incorporation in low-oxygen sediments

Functional trait responses to sediment deposition reduce macrofauna-mediated ecosystem functioning in an estuarine mudflat

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