The effects of short-term increases in turbidity on sandflat microphytobenthic productivity and nutrient fluxes

Pratt, Daniel R.; Pilditch, Conrad A.; Lohrer, Andrew M.; Thrush, Simon F.

doi:10.1016/j.seares.2013.07.009

Cited by 55 publications

(27 citation statements)

References 57 publications

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“…Such increased concentrations of suspended sediments may alter the outcome of interactions between benthic invertebrates and their biotic and abiotic environment both directly and indirectly. For example, light-limited benthic primary production may be directly inhibited in high turbid waters therewith changing food supply to benthic grazers (Pratt et al, 2014b) and alter the interactions between microphytobenthos growth and sediment accretion that determine sediment stability (Van De Koppel et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Bottom–up and top–down mechanisms indirectly mediate interactions between benthic biotic ecosystem components

Colen

Thrush

Parkes

et al. 2015

Journal of Sea Research

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Section: Introductionmentioning

confidence: 99%

Bottom–up and top–down mechanisms indirectly mediate interactions between benthic biotic ecosystem components

Colen

Thrush

Parkes

et al. 2015

Journal of Sea Research

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“…These results suggest that nutrient enrichment enhanced microphytobenthic activity and resulted in a modest net reduction in CO 2 emissions (driven by increased photosynthetic uptake) at our sites. However, www.nature.com/scientificreports www.nature.com/scientificreports/ this reduction in CO 2 did not offset the significant increase in the emission of CH 4 and N 2 O -both of which are likely also a result of increased microbial activity, as both methanogenesis and denitrification (the processes responsible for a majority of CH 4 and N 2 O emissions respectively 1,4,39 ) are controlled by microbial activity in the sediment 37 .…”

Section: Discussionmentioning

confidence: 90%

“…Macrofaunal community characteristics have been found to be important factors influencing the flux of GHGs on temperate intertidal flats, with the abundance of large bioturbating bivalves being key drivers of this influence 15,37 . Consequently, the macrofaunal community characteristics were sampled once in summer and once in winter for each pair of Light/Dark chambers, using one 15 cm deep, 13 cm diameter sediment core immediately adjacent to the paired chambers (within the treatment plot).…”

Section: Site Characteristicsmentioning

confidence: 99%

Nitrogen enrichment increases greenhouse gas emissions from emerged intertidal sandflats

Hamilton

Bulmer

Schwendenmann

et al. 2020

Sci Rep

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Unvegetated, intertidal sandflats play a critical role in estuarine carbon and nutrient dynamics. However, these ecosystems are under increasing threat from anthropogenic stressors, especially nitrogen enrichment. While research in this area typically focuses on sediment-water exchanges of carbon and nutrients during tidal inundation, there remain significant gaps in our understanding of GHG (Greenhouse Gas) fluxes during tidal emergence. Here we use in situ benthic chambers to quantify GHG fluxes during tidal emergence and investigate the impact of nitrogen enrichment on these fluxes. Our results demonstrate significant differences in magnitude and direction of GHG fluxes between emerged and submerged flats, demonstrating the importance of considering tidal state when estimating GHG emissions from intertidal flats. These responses were related to differences in microphytobenthic and macrofaunal activity, illustrating the important role of ecology in mediating fluxes from intertidal flats. Our results further demonstrate that nitrogen enrichment of 600 gN m −2 was associated with, on average, a 1.65x increase in CO 2 uptake under light (photosynthetically active) conditions and a 1.35x increase in co 2 emission under dark conditions, a 3.8x increase in CH 4 emission and a 15x increase in n 2 O emission overall. This is particularly significant given the large area intertidal flats cover globally, and their increasing exposure to anthropogenic stressors.

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“…Turbidity may affect the physical properties of the water column, such as temperature, dissolved oxygen content, sunlight penetration [1,2]. Turbidity can alter the physical structure of benthic habitat, which will affect benthic flora and fauna [3][4][5][6][7]. High turbidity can also damage water management infrastructure and increase the maintenance costs for these structures [1,8].…”

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Variability in a Turbid and Dynamic Tidal Estuarine Environment (Tasmania, Australia): An Assessment of MODIS Band 1 Reflectance

Fischer

Pang

Kidd

et al. 2017

IJGI

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Patterns of turbidity in estuarine environments are linked to hydrodynamic processes. However, the linkage between patterns and processes remains poorly resolved due to the scarcity of data needed to resolve fine scale highly dynamic processes in tidal estuaries. The application of remote sensing technology to monitor dynamic coastal areas such as estuaries offers important advantages in this regard, by providing synoptic maps of larger, constantly changing regions over consistent periods. In situ turbidity measurements were correlated against the Moderate Resolution Imaging Spectrometer Terra sensor 250 m surface reflectance product, in order to assess this product for examining the complex estuarine waters of the Tamar estuary (Australia). Satellite images were averaged to examine spatial, seasonal and annual patterns of turbidity. Relationships between in situ measurements of turbidity and reflectance is positively correlated and improves with increased tidal height, a decreased overpass-in situ gap, and one day after a rainfall event. Spatial and seasonal patterns that appear in seasonal and annual MODIS averages, highlighting the usefulness of satellite imagery for resource managers to manage sedimentation issues in a degraded estuary.

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The effects of short-term increases in turbidity on sandflat microphytobenthic productivity and nutrient fluxes

Cited by 55 publications

References 57 publications

Bottom–up and top–down mechanisms indirectly mediate interactions between benthic biotic ecosystem components

Bottom–up and top–down mechanisms indirectly mediate interactions between benthic biotic ecosystem components

Nitrogen enrichment increases greenhouse gas emissions from emerged intertidal sandflats

Spatio-Temporal Variability in a Turbid and Dynamic Tidal Estuarine Environment (Tasmania, Australia): An Assessment of MODIS Band 1 Reflectance

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