Sediment bioavailable organic matter, deposition rates and mixing intensity in the Setúbal–Lisbon canyon and adjacent slope (Western Iberian Margin)

García, R.; Thomsen, Laurenz; Stigter, Henko de; Epping, Eric; Soetaert, Karline; Koning, Erica; Mendes, Pedro André

doi:10.1016/j.dsr.2010.03.013

Cited by 21 publications

(21 citation statements)

References 50 publications

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“…In Kongsfjorden the seasonal cycle of primary production is strongly pronounced with a marked peak in spring (Svendsen et al 2002;Hop et al 2006). The sedimentation of fresh pelagic organic matter in late spring/early summer has been linked to increased values of CPE in sediments (a proxy for the fresh/labile organic matter, García et al 2010). However, in the present study, no difference between winter and summer was noted for either the POC or Chl a content in sediments.…”

Section: Benthic Response To Seasonal Variability In Kongsfjorden Ecocontrasting

confidence: 68%

Seasonal constancy (summer vs. winter) of benthic size spectra in an Arctic fjord

et al. 2019

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Size spectra are important descriptors of community structure and can indicate changes in community functioning in response to shifts in environmental conditions. There are relatively few assessments of benthic size spectra, and most are based on summer samples alone. Processes influencing size spectra, such as recruitment and predation pressure, vary seasonally, and understanding this variation is necessary to interpret patterns in time or space. Here we compare summer and winter biomass size spectra in the central basin of Kongsfjorden (west Spitsbergen). We recorded seasonal changes in the quality of organic matter available to the benthos, indicated by higher chloroplastic pigments concentrations in surface sediments in summer, as well as in differences in total abundance and biomass of both macrofauna and meiofauna. No significant seasonal differences were documented by multiple regression models for the normalized biomass and size classes. The slope of a linear relationship between normalized biomass and size classes was − 0.54 ± 0.02 indicating a productive system, compared to ecosystems like estuaries. Summer-winter invariability of size spectra suggests that benthic community functioning in this Arctic fjordic system is relatively independent from the seasonality in the supply of organic matter produced in water column.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Section: Benthic Response To Seasonal Variability In Kongsfjorden Ecocontrasting

confidence: 68%

Seasonal constancy (summer vs. winter) of benthic size spectra in an Arctic fjord

et al. 2019

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“…Indications for biological enrichment extending to the lower parts of canyons and adjacent abyssal areas are more scarce, and more often it seems that contrasts between canyon and adjacent areas level out with increasing depth (e.g. Epping et al, 2002;García et al, 2010). Apart from what may be observed in exceptionally active systems such as the Congo Canyon (Vangriesheim et al, 2009), down-canyon transport extending into the lower canyon reaches is probably often too episodic to effectively sustain prolonged enhanced biological activity.…”

Section: Introductionmentioning

confidence: 94%

Organic matter enrichment in the Whittard Channel; its origin and possible effects on benthic megafauna

Amaro

Stigter

Lavaleye

et al. 2015

Deep Sea Research Part I: Oceanographic Research Papers

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“…The extent to which this material travels down these two canyons is thought to be limited, in comparison to Nazaré, owing to the rarity of large-scale episodic events, which are a particular feature of down-canyon sediment transport . Nazaré Canyon has no direct link to any large river systems, yet it has been estimated to have the highest levels of organic carbon and sediment input (Masson et al, 2010;Garcia et al, 2010). Heavy metal contamination of sediments in the canyon suggests output from a number of small river systems enters the canyon (Oliveira et al, 2011), however, inputs from shelf sediments are the most likely source of organic matter input.…”

Section: Relative Abundancementioning

confidence: 99%

“…The large background populations of deep-sea scavenging amphipods, indicated by catches from canyons sampled, can be linked to high levels of sedimentation and enhanced concentrations of associated organic matter found (Vetter and Dayton, 1998;Epping et al, 2002;Garcia et al, 2010;Masson et al, 2010). Setúbal and Cascais Canyons are fed by large river systems (Sado and Tagus Rivers, respectively;Arzola et al, 2008).…”

Section: Relative Abundancementioning

confidence: 99%

Deep-sea scavenging amphipod assemblages from the submarine canyons of the Western Iberian Peninsula

2012

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Abstract. Submarine canyons have often been identified as hotspots of secondary production with the potential to house distinct faunal assemblages and idiosyncratic ecosystems. Within these deep-sea habitats, assemblages of scavenging fauna play a vital role in reintroducing organic matter from large food falls into the wider deep-sea food chain.Free-fall baited traps were set at different depths within three submarine canyons on the Iberian Margin. Amphipods from the traps were identified to species level and counted. Scavenging amphipod assemblages were compared at different depths within each canyon and between individual canyon systems. Using data from literature, abyssal plain assemblages were compared to submarine canyon assemblages. Samples from canyons were found to contain common abyssal plain species but in greater than expected abundances. It is proposed that this is a result of the high organic carbon input into canyon systems owing to their interception of sediment from the continental shelf and input from associated estuarine systems. Community composition differed significantly between the submarine canyons and abyssal plains. The cause of this difference cannot be attributed to one environmental variable due to the numerous inherent differences between canyons and abyssal plains.

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Sediment bioavailable organic matter, deposition rates and mixing intensity in the Setúbal–Lisbon canyon and adjacent slope (Western Iberian Margin)

Cited by 21 publications

References 50 publications

Seasonal constancy (summer vs. winter) of benthic size spectra in an Arctic fjord

Seasonal constancy (summer vs. winter) of benthic size spectra in an Arctic fjord

Organic matter enrichment in the Whittard Channel; its origin and possible effects on benthic megafauna

Deep-sea scavenging amphipod assemblages from the submarine canyons of the Western Iberian Peninsula

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