Seagrass, mangrove and saltmarsh sedimentary carbon stocks in an urban estuary; Coffs Harbour, Australia

Brown, Dylan R.; Conrad, Stephen R.; Akkerman, Kate; Fairfax, Stacy; Fredericks, Jade; Hanrio, Eliot; Sanders, Luciana M.; Scott, Emma; Skillington, Anna J.; Tucker, James P.; Santen, Michelle L. van; Sanders, Christian J.

doi:10.1016/j.rsma.2016.08.005

Cited by 39 publications

(21 citation statements)

References 34 publications

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“…This has prompted increased interest in the potential role of these ecosystems in supporting climate change and adaptation policies, through so-called blue carbon strategies (Nellemann et al 2009, Mcleod et al 2011, Duarte et al 2013. However, studies on carbon sequestration in blue carbon habitats to-date have been disproportionately focused on sites in temperate or tropical climates (Chmura et al 2003, Donato et al 2011, Adame et al 2013, Fourqurean et al 2012, Brown et al 2016, Serrano et al 2016, Macreadie et al 2017. Similar studies in arid regions of the world are relatively scarce, where temperature extremes and low rainfall may affect net ecosystem productivity and primary productivity.…”

Section: Introductionmentioning

confidence: 99%

Organic carbon sequestration and storage in vegetated coastal habitats along the western coast of the Arabian Gulf

Cusack

Saderne

Arias‐Ortiz

et al. 2018

Environ. Res. Lett.

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Section: Introductionmentioning

confidence: 99%

Organic carbon sequestration and storage in vegetated coastal habitats along the western coast of the Arabian Gulf

Cusack

Saderne

Arias‐Ortiz

et al. 2018

Environ. Res. Lett.

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“…(Sanders et al, 2012). Organic C content was calculated by multiplying the organic material, determined from the loss on ignition (LOI) method, by 0.58 as confirmed by Brown et al (2016) for this region. By multiplying soil depth, DBD and organic C content, sediment C stocks for each core were estimated.…”

Section: Sample Collection and C Stock Calculationsmentioning

confidence: 99%

“…Although there has been an increasing amount of studies focusing on quantifying potential CO 2 emissions from blue carbon sediment disturbance to evaluate the effects of habitat loss on greenhouse gas budgets (Pendleton et al, 2012;Brown et al, 2016;Atwood et al, 2017;Lovelock et al, 2017;Macreadie et al, 2017b), there are still uncertainties when it comes to variabilities in C stock estimates, particularly in regards to interecosystem variability (Lavery et al, 2013;Friess and Webb, 2014;Ricart et al, 2015;Hayes et al, 2017;Kelleway et al, 2017). While variations in sedimentary carbon stocks in blue C systems have been documented across longitudinal and estuarine spatial gradients (Lavery et al, 2013;Brown et al, 2016;Sanders et al, 2016;Hayes et al, 2017;Lewis et al, 2017), data on the variability of C stocks from blue C systems of the same geomorphological region are scarce.…”

Section: Introductionmentioning

confidence: 99%

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Does Regional Development Influence Sedimentary Blue Carbon Stocks? A Case Study From Three Australian Estuaries

et al. 2019

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Mitigating climate change through the reduction of atmospheric CO 2 levels is of interest, particularly through maintaining and re-establishing natural ecosystems that act as carbon sinks, such as coastal vegetated habitats or "blue carbon" systems. Here we compare sedimentary blue carbon (C) stocks from 37 sediment cores collected in pristine (n = 13), agricultural (n = 11), and urban (n = 13) estuaries within the same geomorphological region, located on the eastern coast of Australia. The mean estimated C stocks for each carbon system (seagrass, mangrove, and saltmarshes) were 402 ± 78, 830 ± 109, and 723 ± 100 Mg C ha −1 , respectively, conservatively estimated up to 3 m depths. Analysis of variance revealed no significant difference between C stocks per area (C ha −1) considering each habitat type and between specific estuaries. However, the total estuarine C stocks were found to be greater with increasing levels of conservation, based on larger areas of blue carbon vegetation. The potential loss of C to the atmosphere from these small regional estuaries are 500,574 ± 118,635 tons of CO 2 equivalent (CO 2 e), based on specific assumptions. The implication of these results are that there are large C stocks in small regional estuaries which supports the protection of blue C systems in developing coastal areas and highlights the uncertainties of the CO 2 emissions from potential blue C habitat degradation.

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“…Sediment dry bulk density (DBD) was calculated as in Brown, Conrad. 39 A ~2 mg split of the sections were analyzed for Al, zinc (Zn), lead (Pb), cobalt (Co), nickel (Ni), manganese (Mn), and copper (Cu) in an ICP-OES (Ultima II model). Digestion was carried out with conc.…”

Section: Sample Collection and Analysismentioning

confidence: 99%

Influence of Anthropogenic Activities on Trace Metal Accumulation in Brazilian Mangrove Sediments

Conrad

Sanders

2017

Rev. Virtual Quim.

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Resumo: Dois testemunhos de sedimento foram coletados em margem de manguezais para estudar os efeitos de atividades antrópicas na região de Paranaguá, no Brasil. Conteúdos, fluxos e fatores de enriquecimento (FE) de metais-traço foram calculados. Os conteúdos de metais-traço (Hg, Zn, Pb, Ni, Co, Mn e Cu) variaram ao longo dos testemunhos e entre os dois locais, mas não foram indicativos das taxas de acumulação ou EF. Enriquecimentos leves desses metais foram observados de forma consistente com atividades de mineração na área de estudo, ocorridas antes de 1900. Foram observados múltiplos aumentos das taxas de fluxo. Um deles foi congruente com a atividade de mineração pré-industrial que foi observada em ambos os testemunhos. O outro pico de fluxo só foi detectado em um testemunho, ocorrendo após 1990 e não foi acompanhado por nenhum enriquecimento. Este aumento de fluxo foi devido ao desenvolvimento urbano, causando aumento da deposição de partículas de grãos finos nos manguezais da Baía de Laranjeiras. Além de avaliar os impactos das atividades antrópicas em manguezais desta área, um ponto focal adicional deste trabalho foi mostrar os significados do conteúdo, do fluxo e do FE em estudos sobre poluição de sedimentos costeiros. A validade do uso de dados de fluxo e EF, além dos conteúdos de metais, para discernir tendências de contaminação em sedimentos de mangue é discutida.Palavras-chave: Fatores de enriquecimento; metais pesados; fluxo de metais; desenvolvimento urbano; atividades de mineração; Hg; Zn; Pb; Ni; Co; Mn; Cu. AbstractTwo sediment cores were collected at the margins of well-developed mangrove forests to study the effects of anthropogenic activities in the Paranagua region of Brazil. Calculations of sediment trace metal content, flux, and enrichment factors (EF) were performed. Trace metal (Hg, Zn, Pb, Ni, Co, Mn and Cu) contents showed differing values down core and amongst sites, which were not indicative of metal accumulation rates or EF. Slight enrichments of these metals were observed congruent with mining activities in the area occurring prior to 1900. Multiple rapid increases of flux rates were observed, one congruent with pre-industrial mining activity which was observed in both sediment cores. The other flux spike was only detected in one sediment core, occurring post 1990, and was not accompanied by any enrichment. This increase in flux is believed to be due to upstream urban development causing increased fine grain particle deposition in the mangroves of Laranjeiras Bay. Beyond assessing impacts of anthropogenic activities on mangroves of this area, an additional focal point of this work is to show the significance of content flux and EF in studies concerning coastal sediment pollution research. The validity of using flux and EF data, in addition to metals contents, to discern contamination trends in mangrove sediments is discussed.

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Seagrass, mangrove and saltmarsh sedimentary carbon stocks in an urban estuary; Coffs Harbour, Australia

Cited by 39 publications

References 34 publications

Organic carbon sequestration and storage in vegetated coastal habitats along the western coast of the Arabian Gulf

Organic carbon sequestration and storage in vegetated coastal habitats along the western coast of the Arabian Gulf

Does Regional Development Influence Sedimentary Blue Carbon Stocks? A Case Study From Three Australian Estuaries

Influence of Anthropogenic Activities on Trace Metal Accumulation in Brazilian Mangrove Sediments

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