Deep-sea Lebensspuren of the Australian continental margins

Przeslawski, Rachel; Dundas, Kate; Radke, Lynda; Anderson, Tara J.

doi:10.1016/j.dsr.2012.03.006

Cited by 37 publications

(30 citation statements)

References 38 publications

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“…Paleodictyon nodosum has now been observed in abyssal locations in the North and South Atlantic (Rona and Merrill 1978;Ekdale 1980;Rona et al 2009), the SW Pacific (Przeslawski et al 2012) and the eastern equatorial Pacific (this study). The wide distribution and abundance of these traces suggests that they influence the local sedimentary structure.…”

Section: Morphologysupporting

confidence: 51%

“…), which has a sedimentation rate of 1.4 mm ka −1 (Carvalho et al 2011). It is also notably absent from other abyssal sites, including Station M in the eastern Pacific Ocean (4000 m water depth; Jacobsen Stout et al 2015) and sites on the western margin of Australia (1500-4400 m water depth; Przeslawski et al 2012). However, the association of P. nodosum with areas of low sedimentation may be related to their longevity.…”

Section: Resultsmentioning

confidence: 96%

“…Both the fossil and modern forms are known only from deep-sea sediments, including further observations (Fig. 1) at the MAR (Rona et al 2009; ∼3500 m water depth), the South Atlantic (Ekdale 1980; ∼1400 and 4000 m water depth), and on the eastern margin of Australia (Przeslawski et al 2012; 1300-2200 m water depth). Unlike fossil examples of Paleodicyton that are typically observed on the undersides of fine-grained turbidites (Seilacher 1977;Ehrlich 2010), the modern forms were observed on Communicated by C. Smith hemipelagic lutite sediment (MAR), and sandy mud of carbonate detritus (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Abundance and morphology of Paleodictyon nodosum, observed at the Clarion-Clipperton Zone

et al. 2017

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Paleodictyon is an important trace fossil characterised by a regular hexagonal structure and typical of ancient deep-ocean habitats as far back as the Ordovician. It is represented in modern deep-sea settings by Paleodictyon nodosum, known from the Mid-Atlantic Ridge, the South Atlantic, and off eastern Australia. Here we report the occurrence of P. nodosum in the Clarion Clipperton Zone (CCZ), abyssal equatorial Pacific, an area characterised by polymetallic nodule fields. At the study site within the International Seabed Authority northeastern Area of Particular Environmental Interest (APEI-6), P. nodosum appeared as a compact, regular pattern of small circular openings on the seafloor, each pattern interpreted as reflecting the activity of an individual organism. The patterns had a mean size (maximum dimension) of 45 mm ± 16 mm SD (n = 841) and occurred at a density of 0.33 individuals m . Most (82%) were interrupted by nodules, but those that were not displayed both regular (59%) and irregular (41%) forms, the former having equal numbers of rows along the three axes (6 x 6 x 6 and 8 x 8 x 8). In both size and morphology, our Paleodictyon traces were more similar to the Australian examples than to those from the Mid-Atlantic Ridge.

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Section: Morphologysupporting

confidence: 51%

Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Abundance and morphology of Paleodictyon nodosum, observed at the Clarion-Clipperton Zone

et al. 2017

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“…Likewise, the significant correlations between CIs and k TSM indicate that quality changes in bulk OM pools are often related to quality changes in sedimentary pigments. The diversity of Lebensspuren was positively correlated with the CIs of the LHR and WAM datasets (Przeslawski et al 2012), which have notably low levels of reactive OM. Indeed, the preservation of such an abundant and diverse suite of clearly defined invertebrate tracks and traces in these deep-sea sediments probably reflects low overall levels of biological activity on the assumption that extensive bioturbation would obliterate the distinctiveness of the track morphologies.…”

Section: Om Reactivitymentioning

confidence: 94%

Baseline biogeochemical data from Australia's continental margin links seabed sediments to water column characteristics

Radke

Nicholas

Thompson

et al. 2017

Mar. Freshwater Res.

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Abstract. Surficial marine sediments are an important source of nutrients for productivity and biodiversity, yet the biogeochemistry of these sediments is poorly known in Australia. Seabed samples were collected at .350 locations in Australia's western, northern and eastern continental margins during Federal Government surveys . Parameters analysed included measures of organic matter (OM) source (d 13 C, d 15 N and C : N ratios), concentration (percentage total organic carbon, %TOC, and surface area-normalised TOC, OC : SA) and bioavailability (chlorin indices, total reactive chlorins, total oxygen uptake, total sediment metabolism (TSM), sediment oxygen demand (SOD) and SOD and TSM normalised against TOC). The aim of the present study was to summarise these biogeochemical 'baseline' data and make contextualised inferences about processes that govern the observed concentrations. The OM was primarily from marine sources and the OC : SA broadly reflected water column productivity (based on Moderate Resolution Imaging Spectroradiometer, MODIS). Approximately 40% of sediments were organic poor by global standards, reflecting seawater oligotrophy; ,12% were organic rich due to benthic production, high water column productivity and pockmark formation. OM freshness varied due to pigment degradation in water columns and dilution with refractory OM in reworked sediments. d 15 N values confirmed the importance of N 2 fixation to Timor Sea productivity, and point to recycling of fixed nitrogen within food chains in Western Australia.

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“…Additional. Lebensspuren refers to the 'life traces' from bioturbating animals (Przeslawski et al 2012). 183…”

Section: Data Analysis 173mentioning

confidence: 99%

Spatial patterns in the distribution of benthic assemblages across a large depth gradient in the Coral Sea, Australia

et al. 2016

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Manuscript2 clean Click here to view linked References We thank the German Research Foundation (DFG) for the funding (projects Wo896/7 and Lu839/3, to 32 GW and CL respectively) and Marum (www.marum.de) for the ROV equipment supplied for the Deep 33 Down Under Expedition (www.deepdownunder.de). We also thank the captain, crew and scientific party aboard the MV PMG Pride who undertook the sampling during the 2009 voyage. We thank Nicolas 35 Nowald for assistance with the ROV raw data and Andrew Gray-Spence for the Python program coding 36 used for the video data. Taxonomic help is gratefully acknowledged from Marc Eleaume, Richard 37

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Deep-sea Lebensspuren of the Australian continental margins

Cited by 37 publications

References 38 publications

Abundance and morphology of Paleodictyon nodosum, observed at the Clarion-Clipperton Zone

Abundance and morphology of Paleodictyon nodosum, observed at the Clarion-Clipperton Zone

Baseline biogeochemical data from Australia's continental margin links seabed sediments to water column characteristics

Spatial patterns in the distribution of benthic assemblages across a large depth gradient in the Coral Sea, Australia

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