Interactions between sediment microbial ecology and physical dynamics drive heterogeneity in contextually similar depositional systems
Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
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Yn: Limnology and Oceanography, Cyfrol 65, Rhif 10, 10.2020, t. 2403-2419.
Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
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T1 - Interactions between sediment microbial ecology and physical dynamics drive heterogeneity in contextually similar depositional systems
AU - Hope, Julie A.
AU - Malarkey, Jonathan
AU - Baas, Jaco H.
AU - Peakall, Jeff
AU - Parsons, Daniel
AU - Manning, Andrew J.
AU - Bass, Sarah
AU - Lichtman, Ian
AU - Thorne, Peter
AU - Ye, Leiping
AU - Paterson, David M.
PY - 2020/10
Y1 - 2020/10
N2 - This study focuses on the strong interactions between the stability of different sediments and the biological and physical variables that influence the erodibility of the bed. Sampling at short-term temporal scales illustrated the persistence of the microphytobenthic (MPB) community even during periods of frequent, high physical disturbance. The role of MPB in biological stabilisation along a changing sedimentary habitat was also assessed . Key biological and physical properties, such as the MPB biomass, composition and extracellular polymeric substances, were used to predict sediment stability (erosion threshold) of muddy and sandy habitats within close proximity to one another over multiple days as well as within emersion periods. This allowed the effects of dewatering, MPB growth and productivity to be examined as well as the resilience and recovery of the MPB community after physical disturbance from tidal currents and wave exposure. Canonical analysis of principal components (CAP) ordinations were used to illustrate the trends observed in bio-physical properties between the sites, while marginal and sequential distance-based linear models (DistLM) were used to identify key properties influencing sediment erodibility. While grain size was important for site differences in the CAP analysis, it contributed less to the variability in sediment erodibility than other key biological parameters. Among the biological predictors, MPB diversity explained very little variation in marginal tests but was a significant predictor in sequential tests when MPB biomass was also considered with diversity and biomass key predictors of sediment stability, contributing 9% and 10% respectively to the final model across all sites.
AB - This study focuses on the strong interactions between the stability of different sediments and the biological and physical variables that influence the erodibility of the bed. Sampling at short-term temporal scales illustrated the persistence of the microphytobenthic (MPB) community even during periods of frequent, high physical disturbance. The role of MPB in biological stabilisation along a changing sedimentary habitat was also assessed . Key biological and physical properties, such as the MPB biomass, composition and extracellular polymeric substances, were used to predict sediment stability (erosion threshold) of muddy and sandy habitats within close proximity to one another over multiple days as well as within emersion periods. This allowed the effects of dewatering, MPB growth and productivity to be examined as well as the resilience and recovery of the MPB community after physical disturbance from tidal currents and wave exposure. Canonical analysis of principal components (CAP) ordinations were used to illustrate the trends observed in bio-physical properties between the sites, while marginal and sequential distance-based linear models (DistLM) were used to identify key properties influencing sediment erodibility. While grain size was important for site differences in the CAP analysis, it contributed less to the variability in sediment erodibility than other key biological parameters. Among the biological predictors, MPB diversity explained very little variation in marginal tests but was a significant predictor in sequential tests when MPB biomass was also considered with diversity and biomass key predictors of sediment stability, contributing 9% and 10% respectively to the final model across all sites.
KW - microphytobenthos
KW - biostabilisation
KW - temporal dynamics
KW - biofilm
KW - sediment erosion
U2 - 10.1002/lno.11461
DO - 10.1002/lno.11461
M3 - Article
VL - 65
SP - 2403
EP - 2419
JO - Limnology and Oceanography
JF - Limnology and Oceanography
SN - 0024-3590
IS - 10
ER -