Determination of the Optimum Sampling Intervals in Sediment Pore Waters Using the Autocovariance Function

Morse, John W.; DiMarco, Steven F.; Sell, Karen S.; Hebert, Andrew B.

doi:10.1023/b:aqua.0000005657.18821.46

Cited by 4 publications

(2 citation statements)

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“…13 Lateral scale observations of SH 2 S at four different sediment depths for seagrass (SG1) and unvegetated (UV1) sediments (Note N = 1 because in replicate experiments analytes were below detection) patches of SRB. Scale lengths for determining the dominant source of variability using the autocovariance function (see Morse et al 2003 for details) demonstrated that appropriate lengths of scale in the vertical profile were similar to those measured previously at the site and did not vary significantly on a diurnal time scale (Table 3).…”

Section: Unvegetated Sedimentssupporting

confidence: 61%

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Small-scale heterogeneity in the geochemistry of seagrass vegetated and non-vegetated estuarine sediments: causes and consequences

2006

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In addition to nutrient and light availability, sedimentary biogeochemical processes can play an essential role in seagrass productivity. Previous investigations of the interactions between seagrasses and their underlying sediments have failed to clearly identify the spatio-temporal variability of the major geochemical parameters involved. Dissolved and solid phase chemical parameters in eelgrass vegetated and nearby non-vegetated sediments were investigated in this study to determine their vertical, lateral, and temporal distributions. Solid-state microelectrodes were used to investigate dissolved O 2 , SH 2 S, Fe 2+ , and Mn 2+ on mm space scales. In this study, spatial heterogeneity was assessed and diurnal ''ventilation'' by seagrass productivity (i.e., the translocation of photosynthetically produced oxygen to the anoxic sedimentary environment) was not observed probably because benthic infaunal activity (bioturabation and bioirrigation) and microzones established by microbial processes led to highly heterogeneous sediment geochemistry where temporal variability was obscured by small-scale spatial variability. Non-vegetated sediments were less 2006 geochemically variable laterally than vegetated sediments, however, in some cases, they had similar vertical variability, possibly because they had been vegetated at an earlier time. This study demonstrates that in vegetated sediments where there is also substantial benthic macrofaunal activity it is difficult to separate the impacts of the two types of biota on sediment geochemistry and their spatial patterns, and it also raises the question of the applicability of traditional one-dimensional diagenetic models for such spatially-temporally complex sediments.

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Section: Unvegetated Sedimentssupporting

confidence: 61%

“…These processes can vary on small spatial (<1 mm) and temporal (<1 h) scales (Harper et al 1999;Shuttleworth et al 1999;Hebert and Morse 2003;Morse et al 2003). Geochemical processes in seagrass-vegetated sediments are generally not at steady state.…”

Section: Introductionmentioning

confidence: 99%