Effects of Experimental Sediment Resuspension on a Coastal Planktonic Microbial Food Web

Garstecki, Tobias; Wickham, Stephen A.; Arndt, Hartmut

doi:10.1006/ecss.2001.0937

Cited by 48 publications

(41 citation statements)

References 34 publications

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“…The response of coastal osmotrophic communities to these different events may therefore be expected to show some regularities. In the first place, an almost immediate signal in biomass parameters may occur after any of these perturbations, due to the input of microorganisms either from runoff (de Madariaga et al 1992) or from benthos resuspension (Garstecki et al 2002). However, this signal is expected to be transient, as organisms are diluted or sink to the bottom.…”

Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

Episodic meteorological and nutrient-load events as drivers of coastal planktonic ecosystem dynamics: a time-series analysis

Guadayol¹,

Peters²,

Marrasé³

et al. 2009

Mar. Ecol. Prog. Ser.

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In temperate coastal zones, episodic meteorological forcing can have a strong impact on the classical seasonal phytoplankton succession. Episodes of continental runoff and wind storms involve nutrient enrichment and turbulence, 2 factors that can promote primary production and alter the planktonic community species composition and size structure. We determined the joint influence of these 2 variables on the osmotrophic plankton of an oligotrophic NW Mediterranean open bay. We used an 8 yr long time series of monthly physical, chemical and biological water-column parameters, and we looked for correlations between these and several meteorological and physical highfrequency time series through cross-correlation analyses. Influence of river runoff in this particular location was found to be very important for phytoplankton dynamics, whereas no immediate response of bacterioplankton was detected. Resuspension events caused by waves had a secondary importance. Cross correlations allowed defining a sequence of responses to these types of forcing, from changes in water turbidity and salinity, to increases in phytoplankton and bacteria abundances through nutrient enrichments. The maximum response of the ecosystem in terms of chlorophyll a concentration lagged nutrient enrichment events by about 1 wk. A more detailed analysis was performed between June 2003 and June 2004, a period characterised by an intense drought in summer and by 6 strong meteorological events afterwards. The increase in the frequency of meteorological events during this period drove the system from heterotrophy to autotrophy. Our data stress the importance of episodic meteorological events in coastal planktonic communities. KEY WORDS: Episodic meteorological forcing · Coastal osmotrophic plankton · Waves · Terrestrial runoff · Sediment resuspension · Nutrients · Time series · NW Mediterranean Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 381: [139][140][141][142][143][144][145][146][147][148][149][150][151][152][153][154][155] 2009 3 different environments, and thus are subjected to the variability in continental, atmospheric and oceanic forcing. In particular, Mediterranean littoral systems offer a good template to study how such episodic types of forcing may alter the dynamics of the osmotrophic plankton away from the typical seasonal pattern, for 2 reasons. First, because the Mediterranean Sea is generally oligotrophic, and thus signals of allochthonous inputs may be more easily detected. Second, because one of the main characteristics of the Mediterranean climate is the irregularity of its temporal pattern of precipitation and storms (e.g. Cebrián et al. 1996).Episodes of rainfall and wind storms are both likely to cause an input of allochthonous material into the Mediterranean coastal zone. On the one hand, sporadic heavy rainfall events often result in catastrophic terrestrial runoff, a general characteristic of the Mediterranean climate (e.g. Cebrián et al. 1996). Such cases of runo...

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Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

Episodic meteorological and nutrient-load events as drivers of coastal planktonic ecosystem dynamics: a time-series analysis

Guadayol¹,

Peters²,

Marrasé³

et al. 2009

Mar. Ecol. Prog. Ser.

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“…Furthermore, the response was species-specific among bacterivorous suspension feeders (several scuticociliates and a Euplotes, the latter being inhibited in strong flow), suggesting that flow regime could affect their relative population growth rates and hence community structure. Sediment resuspension, another flowinduced process, has been shown experimentally to enhance growth rates and intensify trophic interactions throughout the sedimentary protistan community, including diatoms, flagellates, ciliates, and rhizopods (Garstecki & Wickham 2001, Garstecki et al 2002. Shimeta et al (2002Shimeta et al ( , 2003 documented periodic resuspension at Stations RH and WI, with various taxa of ciliates and diatoms displaying different thresholds of flow strength for resuspension.…”

Section: Community Structure In Relation To Flow and Grain Sizementioning

confidence: 99%

“…Flow strength affects feeding rates of subtidal ciliates (Shimeta et al 2001) and the species structure of ciliate communities on sandy shores (Lucchesi & Santangelo 1997). Resuspension stimulates growth and trophic interactions of unicellular sedimentary protists (Garstecki & Wickham 2001, Garstecki et al 2002, and the fact that benthic diatoms and ciliates each show species-specific resuspension dynamics (Lucas et al 2001, Shimeta et al 2002 also suggests that flow regime can influence populations differentially and possibly impact community structure. Furthermore, resuspension dynamics can differ between sites in ways suggesting an interaction between flow regime and grain size (Shimeta et al 2003).…”

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confidence: 99%

Community structure of marine sedimentary protists in relation to flow and grain size

Shimeta¹,

Gast²,

Rose³

2007

Aquat. Microb. Ecol.

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Populations of unicellular, marine sedimentary protists are constrained by a variety of physical environmental factors, but influences of flow regime have rarely been studied. We compared community structure among 3 subtidal sites differing in flow strength and grain size in a coastal bay. We used denaturing gradient gel electrophoresis (DGGE) to assess eukaryotic diversity based on 18S rDNA, and quantitative Protargol staining (QPS) to examine ciliate communities by microscopy. Sedimentary 18S rDNA in mid-summer was dominated by diatoms. Analyses of gel bands by presence/ absence among sites, dendogram, and multidimensional scaling showed that eukaryotic community structure was related to grain size more strongly than to flow regime. Among bands identified as diatoms by recovery and sequence analysis, 4 taxa (40%) differed among sites in relation to flow strength, and 2 taxa (29%) differed in relation to grain size. No bands had sequences matching ciliates, but QPS showed that 6 ciliate species (20%) were distributed in relation to flow, and 10 species (33%), in relation to grain size. Ciliate species richness and community similarity were greatest for the 2 strong-flow sites, despite differences in mean grain size. The strong-flow, silty site had the highest concentrations of chlorophyll a, total ciliates, karyorelictids, and scuticociliates, and the lowest ciliate species diversity. DGGE was run again for this site 1 mo later and revealed a shift in the rDNA pool to dominance by metazoans. Flow regime and grain size may be important factors structuring subtidal communities of sedimentary protists.KEY WORDS: Ciliates · Diatoms · Benthic · Community structure · Flow · Grain size · DGGE Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 48: 91-104, 2007, Fernandez-Leborans 2001. Most of this research has been done in intertidal habitats, whereas little work has addressed the physical factors influencing subtidal populations.Recent studies have revealed impacts of flow regime on benthic protozoa and microalgae. Flow strength affects feeding rates of subtidal ciliates (Shimeta et al. 2001) and the species structure of ciliate communities on sandy shores (Lucchesi & Santangelo 1997). Resuspension stimulates growth and trophic interactions of unicellular sedimentary protists (Garstecki & Wickham 2001, Garstecki et al. 2002, and the fact that benthic diatoms and ciliates each show species-specific resuspension dynamics (Lucas et al. 2001, Shimeta et al. 2002 also suggests that flow regime can influence populations differentially and possibly impact community structure. Furthermore, resuspension dynamics can differ between sites in ways suggesting an interaction between flow regime and grain size (Shimeta et al. 2003). Detailed analyses of community structure have not been conducted, however, in relation to flow regime at subtidal habitats.Here we assess community structure at subtidal sites (ca. 15 m depth) that differ in flow regime and grain size in a coastal e...

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“…The processes that occur during sediment resuspension have also been shown to be related to the presence of blooms of phytoplankton in certain environments (Hansson et al, 1994;Huisman et al, 1999;Garstecki et al, 2002). For example, phytoplankton blooms occur mainly during the low mixing periods in neap tides of South San Francisco Bay, a large marine embayment (Cloern, 1991).…”

Section: Introductionmentioning

confidence: 99%

Tracking the Response of Phytoplankton following Gyttja Disturbance: a Mesocosm Field Study in Myall Lakes, New South Wales, Australia

Rukminasari¹

2013

ijms

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This study determined whether artificially mixing gyttja, an organic sediment that contains high levels of NH4, with its overlying waters, affected phytoplankton abundance and species composition in Myall Lake (NSW, Australia). A series of mesocosms was employed, with three mesocosms being designated as controls, i.e. no gyttja mixing, and three others termed impact mesocosms, i.e. in which gyttja was mixed with the overlying waters. Sampling was undertaken during a 5 day period in sediment disturbance, and phytoplankton community variables were recorded at seven intervals, i.e. just prior to disturbance and 30 minutes, 3 hours, 1, 2, 3, 4 and 5 days after gyttja disturbance. Comparisons of these community variables among treatments and over time convincingly demonstrated that overall phytoplankton abundance rose from 20,000 cells/mL just prior to disturbance to between 30,000 cells/mL and 55,000 cells/mL 2 to 4 days after gyttja mixing. This rise in abundance was attributable to a substantial increase in the cyanophycea over the same period. In contrast to the cyanophyceae, the abundance of bacillariophyceae increased sharply following disturbance from 150 to >1000 cell/mL and did not exceed 1000 cell/mL for the duration of the experiment. This supported the hypothesis that gyttja mixing does introduce benthic microalgae into the water column. Sediment disturbance caused differences in species composition in time, with cyanobacteria being mostly influenced taxa. Each period of disturbance between mesocosm have different assemblages of species.

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Effects of Experimental Sediment Resuspension on a Coastal Planktonic Microbial Food Web

Cited by 48 publications

References 34 publications

Episodic meteorological and nutrient-load events as drivers of coastal planktonic ecosystem dynamics: a time-series analysis

Episodic meteorological and nutrient-load events as drivers of coastal planktonic ecosystem dynamics: a time-series analysis

Community structure of marine sedimentary protists in relation to flow and grain size

Tracking the Response of Phytoplankton following Gyttja Disturbance: a Mesocosm Field Study in Myall Lakes, New South Wales, Australia

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