Autotrophic picoplankton dynamics in a Chesapeake Bay sub-estuary

Ray, R. T.; Haas, LW; Sieracki, Michael E.

doi:10.3354/meps052273

Cited by 82 publications

(74 citation statements)

References 30 publications

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“…The contribution from picoplankton (e.g., cyanobacteria) in the York River estuary, however, is believed to be limited based on findings that they comprise only ϳ7% of the total autotrophic biomass (Ray et al 1989) and contribute an order of magnitude less C than bacteria (Eldridge and Sieracki 1993).…”

Section: Methodsmentioning

confidence: 99%

Bioreactivity of estuarine dissolved organic matter: A combined geochemical and microbiological approach

2006

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An integrated multidisciplinary study utilizing geochemical and microbial ecological approaches was conducted to characterize the origins, chemical nature, and quantities of dissolved and particulate organic matter (OM) utilized by heterotrophic bacteria in a temperate estuary. C : N, stable isotope (␦ 13 C), and lipid biomarker analyses revealed differences in the inferred reactivity of autochthonous versus allochthonous OM sources. Isotopic comparison of OM size fractions and bacterial nucleic acids suggests that high-molecular-weight dissolved OM (DOM) is consistently linked to bacterial biomass synthesis along the estuarine salinity gradient. Polyunsaturated fatty acids (as percent of total fatty acids, FA) were a reliable predictor of DOM decomposition in bioassays, thus providing an indicator directly linking DOM reactivity to its composition. Significant positive correlations between FA diagnostic of bacterial sources and lipid biomarker compounds diagnostic of planktonic origin indicate a systematic bacterial response to autochthonous DOM sources along the estuarine continuum. These findings further suggest that, although the geochemical signature of algal-derived OM in the dissolved phase may appear quantitatively insignificant, this fraction may nevertheless represent a principal source of bioreactive OM to heterotrophic bacteria in estuarine waters.

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Section: Methodsmentioning

confidence: 99%

Bioreactivity of estuarine dissolved organic matter: A combined geochemical and microbiological approach

2006

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“…Cell concentrations of PC were converted to chlorophyll a assuming a PC cell diameter of 1.2 pm and using 250 fg cell C pm-3 (Kana & Glibert 1987, Booth 1988) and a C : chl a ratio of 22.5 (Takahashi et al 1985, Geider 1987, Ray et al 1989. The contribution of PC to total chlorophyll a (F) was in the range of 3 to 63 %.…”

Section: No3-mentioning

confidence: 99%

Dynamics of picocyanobacteria in the Seto Inland Sea (Japan) during summer

Nakamura¹,

Sasaki²,

Hiromi³

et al. 1993

Mar. Ecol. Prog. Ser.

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Temporal and vertical changes of picocyanobacteria (PC) were monitored daily together with environmental variables during the sunlmer stratification period (16 July to 9 August 1992) in the Seto Inland Sea, Japan. Coupled with wind mixing, N-and P-nutrients were introduced to the surface layer twice (19 July and after 30 July). A PC bloom (5 x 104 ml-l) occurred following the first mixing event, and a rapid decrease of this bloom seemed to be attnbuted to high abundance (>2 X 103 ml-'1 of heterotrophic nanoflagellates (HNAN). In contrast, the second w i n g event did not induce a PC bloom in spite of the high nutrient concentration, low abundance of HNAN (< 2 X 103 ml-l) and optimum temperature for growth. Field experiments on PC growth In the < 2 pm seawater fraction conducted during the second mixing period revealed that addition of metal buffer solution enhanced the PC growth rates significantly. Although trace metal concentrations were not monitored and clean techniques were not used in the experiments, we infer that growth stimulation was not an experin~ental artifact, b'ut due to Fe-deficiency of the PC populations. This is based on results obtained in our previous studies concerning trace metal contaminatlon. It is suggested that Fe-deficiency was responsible for the lack of a PC bloom during the second rnixlng penod.

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“…Knowledge derived from experiments in Atlantic coastal waters may not be directly applicable to Mediterranean waters, as their planktonic communities are dominated by nano-and microplankton (e.g. Oviatt et al 1989, Ray et al 1989, Tremblay & Legendre 1994 and picoplanktonic (e.g. Agawin et al 1998) organisms, respectively.…”

Section: Introductionmentioning

confidence: 99%

Response of a Mediterranean phytoplankton community to increased nutrient inputs:a mesocosm experiment

Duarte¹,

Agustı́²,

Agawin³

2000

Mar. Ecol. Prog. Ser.

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The response of the biomass and primary production of a coastal NW Med~terranean phytoplankton community to a gradient of nutrient inputs was examined in a large-scale mesocosm nutrient enrichment expenment over a period of 20 d in summer. The mesocosm units (33 m3) received N, P and Si at a stoichiometric ratio of 20 N:? Si:l P, at the normal nutrient loading rate at the site (5 mm01 N m-' d-' and 0.25 mm01 P m-2 d-l), and at 0.5, 2, 4, 8 and 16 times the normal nutrient loading rate. The biomass and production of the phytoplanktonic community was also examined in a mesocosm unit to which no nutrients were added Substantial differences in phytoplankton biomass were observed 4 to 12 d after the initiat~on of the experiment, when nutrient inputs were increased more than 4-fold above the normal nutrient loading rate The b~omass of the community increased to a maximum of 40.8 pg chlorophyll a I-' (200-fold above the mean initial value) at the greatest nutrient inputs. The biomass increase was largely attributable to an increase in the microphytoplankton biomass (Chaetoceros sp. and Licmophora sp.), while picophytoplankton increased their biomass only during the earlier phase of the experiment, reaching values 4.7 times greater at the highest nutrient addition than at the normal loading rate. The structure of the phytoplankton community shifted from an initial dominance of picophytoplankton to dominance of microphytoplankton at the highest nutrient loadings Primary production increased in response to increased nutrient loading, reaching a level 10-fold higher at the highest nutrient loading than at the normal loading rate. However, phytoplankton carbon turnover did not increase significantly with increasing loading (p > 0.05), except for a tendency for higher turnover at the highest nutrient inputs tested. Results from this experiment suggest that eutrophication problems are likely to become important at a loading of more than 4-fold higher (20 mm01 N m" d-' and 1 rnrnol P m-' d-') than the present values supplied to the coastal Medlterranean community studied.

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Autotrophic picoplankton dynamics in a Chesapeake Bay sub-estuary

Cited by 82 publications

References 30 publications

Bioreactivity of estuarine dissolved organic matter: A combined geochemical and microbiological approach

Bioreactivity of estuarine dissolved organic matter: A combined geochemical and microbiological approach

Dynamics of picocyanobacteria in the Seto Inland Sea (Japan) during summer

Response of a Mediterranean phytoplankton community to increased nutrient inputs:a mesocosm experiment

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