Stratigraphic architecture and evolution of a barrier seagrass bank in the mid-late Holocene, Shark Bay, Australia

Bufarale, Giada; Collins, Lindsay B.

doi:10.1016/j.margeo.2014.11.010

Cited by 19 publications

(24 citation statements)

References 44 publications

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“…This corresponds to an average sediment thickness of 3.1 ± 0.4 m, as indicated by long-term sediment accumulation rates estimated in this study (mean ± s.e.m. : 0.77 ± 0.11 mm yr −1 ; Table 1), in agreement with vertical accretion rates of ∼ 1 mm yr −1 published by others 16,29 and supported by the dominant seagrass δ 13 C signature of sediment C along the cores. Based on those, the C stocks accumulated over the last 4,000 cal yr bp averaged 334 ± 34 Mg C ha −1 .…”

Section: Seagrass C Storage Hotspotsupporting

confidence: 91%

“…Analyses of 210 Pb, 14 C and grain size were conducted in cores cut at 1 cm resolution (11 cores), while dry bulk density, percentage of C and δ 13 C were measured in all cores (28 cores) in alternate slices every 3 cm (upper 50 cm), and every 6 cm (below 50 cm). We combined our data with previously published studies in Shark Bay involving coring in seagrass sediments 7,16,51 . From ref.…”

Section: Methodsmentioning

confidence: 99%

“…These estimates are limited to the upper metre of seagrass sediment C stocks (as are the global estimates) and, therefore, are probably underestimates of full C inventories since seagrass C deposits reach several metres in thickness in Shark Bay 16 . Seismic profiles combined with 14 C dating indicate that the seagrass banks here contain a continuous 4,000 yr record of sediment and C accumulation 16 . This corresponds to an average sediment thickness of 3.1 ± 0.4 m, as indicated by long-term sediment accumulation rates estimated in this study (mean ± s.e.m.…”

Section: Seagrass C Storage Hotspotmentioning

confidence: 99%

“…Up to 12 seagrass species are found in Shark Bay, storing C in their sediments and shaping its geomorphology. The two most notable seagrass banks, the Wooramel Bank and the Faure Sill, are the result of ~8,000 yr of continuous seagrass growth 16 . Despite seagrasses having thrived over millennia in Shark Bay, unprecedented widespread losses occurred in the austral summer of 2010/2011 in both the above-and below-ground biomass of the dominant seagrass A. antarctica and to a minor extent Posidonia australis 12,13 , the two species forming large continuous beds.…”

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confidence: 99%

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A marine heatwave drives massive losses from the world’s largest seagrass carbon stocks

et al. 2018

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Masqué, Pere; Lavery, P. S.; Mueller, U.; Kendrick, G. A.; Rozaimi, M.; Esteban, A.; Fourqurean, J. W.; Marbà, N.; Mateo, M. A.; Murray, K.; Rule, M. J.; Duarte, Carlos M. Citation Arias-Ortiz A, Serrano O, Masqué P, Lavery PS, Mueller U, et al. (2018) A marine heatwave drives massive losses from the world's largest seagrass carbon stocks. Nature Climate Change 8: 338-344. Available: http://dx.Seagrass ecosystems contain globally significant organic carbon (C) stocks. However, climate change and increasing frequency of extreme events threaten their preservation. Shark Bay, Western Australia, has the largest C stock reported for a seagrass ecosystem, containing up to 1.3% of the total C stored within the top metre of seagrass sediments worldwide. On the basis of field studies and satellite imagery, we estimate that 36% of Shark Bay's seagrass meadows were damaged following a marine heatwave in 2010/2011. Assuming that 10 to 50% of the seagrass sediment C stock was exposed to oxic conditions after disturbance, between 2 and 9 Tg CO 2 could have been released to the atmosphere during the following three years, increasing emissions from land-use change in Australia by 4-21% per annum. With heatwaves predicted to increase with further climate warming, conservation of seagrass ecosystems is essential to avoid adverse feedbacks on the climate system.

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Section: Seagrass C Storage Hotspotsupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Seagrass C Storage Hotspotmentioning

confidence: 99%

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confidence: 99%

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A marine heatwave drives massive losses from the world’s largest seagrass carbon stocks

et al. 2018

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“…Rovere et al, 2010a;Serrano et al, 2011). Recent long-term analyses on the evolution of Shark Bay (Australia) have revealed a key role of seagrass meadows (mainly Amphibolis spp) since the early Holocene (12-8 ka BP) in controlling the production and deposition of a significant amount of bioclastic sediments (Bufarale and Collins, 2015). Comparable investigations are presently lacking for P. oceanica despite its occurrence in sedimentary records from paleogeographic reconstructions along the Mediterranean coasts (e.g.…”

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Biogeomorphology of the Mediterranean Posidonia oceanica seagrass meadows

Vacchi

Falco

Simeone

et al. 2016

Earth Surf Processes Landf

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Here we review the multiple interactions between the endemic Mediterranean seagrass, Posidonia oceanica, and coastal geomorphologic processes as an outstanding example of biogeomorphology, taking into account recent advances in the field. Seagrass meadows are among the most important elements for the functioning of marine coastal ecosystems, and represent a major focus for research and conservation. Being considered a priority habitat, P. oceanica meadows are protected by several European Union directives and national laws. In this paper we examine: the role of sedimentary features in controlling the development of the meadows; the interplay between P. oceanica leaf litter (i.e. beached necromass) cast ashore and erosional-depositional processes on the beaches; the interactions between meadows and nearshore hydrodynamics, and; possible linkages between geomorphological features of the seafloor and the architecture of meadows. Finally, we provide perspectives for future research on P. oceanica and other Mediterranean seagrass meadows in a biogeomorphological context with specific reference to climate change.

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Impacts of Severe Tropical Cyclone Olwyn and the biogeomorphic response, Hamelin Pool, Shark Bay, Western Australia

Morris

Fearns

et al. 2022

The Depositional Record

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Storm disturbance and recovery of the peritidal benthic microbial ecosystem occurs as part of the natural climate regime in Shark Bay. However, tropical cyclone and winter storm frequency and intensity are known to be changing due to climate forcing. Presented here is an analysis of the biogeomorphic response of the benthic microbial ecosystem within the intertidal to upper subtidal zone and the beach face coquina deposits of Hamelin Pool, to the passage of Category 3 Severe Tropical Cyclone Olwyn (13 March 2015). Storm effects (initial response to 40 days post‐event) include: erosional sculpting of sediments, mats and structures; deposition and winnowing of sediments; accumulation of mucilaginous products into flocs, slurries and sludges; along with limited development of new coquina deposits in the beach face. Medium (15 months) term observations include: mat recovery and changes with transformation of mucilage deposits into new subtidal gelatinous mats, intertidal transitional mats and low‐elevation microbial structures. Observations suggest that this disturbance had both positive (the floc‐to‐mat biogeomorphic storm response) and negative feedbacks (enhanced bioturbation), which impact the development of stromatolite forming microbial mats and microbialite structures.

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Stratigraphic architecture and evolution of a barrier seagrass bank in the mid-late Holocene, Shark Bay, Australia

Cited by 19 publications

References 44 publications

A marine heatwave drives massive losses from the world’s largest seagrass carbon stocks

A marine heatwave drives massive losses from the world’s largest seagrass carbon stocks

Biogeomorphology of the Mediterranean Posidonia oceanica seagrass meadows

Impacts of Severe Tropical Cyclone Olwyn and the biogeomorphic response, Hamelin Pool, Shark Bay, Western Australia

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