Evidence for an enhanced substrate requirement by marine mesophilic bacterial isolates at minimal growth temperatures

Wiebe, W. J.; Sheldon, Wade M.; Pomeroy, Lawrence R.

doi:10.1007/bf00177192

Cited by 82 publications

(88 citation statements)

References 44 publications

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“…Our results concur with those of Wiebe et al [47], who also found seasonal differences in microbial food web regulation in a mesotrophic, prealpine lake. In that study, bacterial or protozoan uptake of DOM produced from phytoplankton during winter and early spring was low, permitting greater energy flow to zooplankton and benthic animals.…”

Section: Discussionsupporting

confidence: 93%

Use of Metabolic Inhibitors to Characterize Ecological Interactions in an Estuarine Microbial Food Web

DeLorenzo

Lewitus²,

Scott

et al. 2001

Microbial Ecology

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A B S T R A C TUnderstanding microbial food web dynamics is complicated by the multitude of competitive or interdependent trophic interactions involved in material and energy flow. Metabolic inhibitors can be used to gain information on the relative importance of trophic pathways by uncoupling selected microbial components and examining the net effect on ecosystem structure and function. A eukaryotic growth inhibitor (cycloheximide), a prokaryotic growth inhibitor (antibiotic mixture), and an inhibitor of photosynthesis (DCMU) were used to examine the trophodynamics of microbial communities from the tidal creek in North Inlet, a salt marsh estuary near Georgetown, South Carolina. Natural microbial communities were collected in the spring, summer, and fall after colonization onto polyurethane foam substrates deployed in the tidal creek. Bacterial abundance and productivity, heterotrophic ciliate and flagellate abundance, and phototrophic productivity, biomass, and biovolume were measured at five time points after inhibitor additions. The trophic responses of the estuarine microbial food web to metabolic inhibitors varied with season. In the summer, a close interdependency among phototrophs, bacteria, and protozoa was indicated, and the important influence of microzooplanktonic nutrient recycling was evident (i.e., a positive feedback loop). In the fall, phototroph and bacteria interactions were competitive rather than interdependent, and grazer nutrient regeneration did not appear to be an important regulatory factor for bacterial or phototrophic activities. The results indicate a seasonal shift in microbial food web structure and function in North Inlet, from a summer community characterized by microbial loop dynamics to a more linear trophic system in the fall. This study stresses the important role of microbial loops in driving primary and secondary production in estuaries such as North Inlet that are tidally dominated by fluctuations in nutrient supply and a summer phytoplankton bloom.

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Section: Discussionsupporting

confidence: 93%

Use of Metabolic Inhibitors to Characterize Ecological Interactions in an Estuarine Microbial Food Web

DeLorenzo

Lewitus²,

Scott

et al. 2001

Microbial Ecology

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“…Weak reactivity of bacteria to phytoplankton blooms in the Southern Ocean has been explained on the grounds that low temperature limits bacterial response by reducing their growth and enhancing their substrate requirements (Wiebe et al 1993;Pomeroy and Wiebe 2001). In addition, the unsuitability of the macromolecular nature of the organic matter derived from the blooms of large Antarctic diatoms to be readily used by bacteria has been proposed to explain this weak reactivity (Fiala and Delille 1992).…”

Section: Discussionmentioning

confidence: 99%

Experimental test of bacteria-phytoplankton coupling in the Southern Ocean

et al. 2005

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A set of eight large (20 m 3 ) mesocosms were moored in Johnson's Dock (62Њ39.576ЈS, 60Њ22.408ЈW, Livingston Island, Antarctica) to experimentally generate a gradient of phytoplankton biomass and production in order to test the extent of coupling between bacteria (heterotrophic Bacteria and Archaea) and phytoplankton, as well as the role of bacterial losses to protist grazers. This was achieved by imposing four light levels (100%, 50%, 25%, and 10%) in the presence or absence of nutrient additions (0.1 mol NH 4 Cl, 0.1 mol F 6 Na 2 Si, and 0.01 mol KH 2 PO 4 per day per mesocosm). The experimental treatments resulted in a broad range of chlorophyll a (Chl a) (0.31-93.5 g Chl a L Ϫ1) and average primary production rates, while bacteria responded in a much narrower range of biomass (3-447 g C L Ϫ1) and production (0.21-15.71 g C L Ϫ1 d Ϫ1

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“…However, from date 4-5 (May-June, P1), and date 12-13 (August, P3), the increase in GP is related to an increase in respiration rates. Although the lack of bacterioplankton data limits the interpretation of these findings, high temperatures were recorded on day 5 and 13, which usually favours picoheterotrophic activity (Wiebe et al, 1993). Additionally, on both occasions there was a peak for ciliate abundance, the best biological predictor of DCR according to Spearman's correlation.…”

Section: Production and Respiration Ratesmentioning

confidence: 95%

Microplankton composition, production and upwelling dynamics in Sagres (SW Portugal) during summer of 2001

Loureiro¹,

Newton²,

Icely³

2005

Sci. Mar.

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SUMMARY: Microplankton community, production, and respiration were studied alongside physical and chemical conditions at Sagres (SW Portugal) during the upwelling season, from May to September 2001. The sampling station was 5 km east of the upwelling centre off Cabo S. Vicente, and 2 km west of an offshore installation for bivalve aquaculture. Three major periods were distinguished according to sea surface temperature (SST): period 1 (P1; May and June), characterised by high temperature values (17.0±1.8ºC); period 2 (P2; July), characterised by lower temperatures (14.6±0.3ºC), identified as an upwelling-blooming stage; and period 3 (P3; August), characterised by a high temperature pattern (16.25±1.14ºC). Chaetoceros spp., Thalassiosira spp., Lauderia spp., Detonula spp. and Pseudo-nitzschia spp. were the major taxa contributing to the dissimilarities between P2 (July) and the other periods. In July (P2), the average gross production (GP; 52.5±12.3 µM O 2 d -1 ) and net community production (NCP; 46.9±15.3 µM O 2 d -1 ) peaked with the maximal concentrations of diatom-chl a. Dark community respiration (DCR) remained low and more constant throughout (4.6±3.6 µM O 2 d -1 ). The plankton assemblage was dominated by diatoms throughout the survey. Physical events were the primary factors determining the microplankton structure and distribution at this location.Keywords: production, respiration, microplankton community, Iberian Peninsula, Cabo S. Vicente. RESUMEN: COMPOSICIÓN DEL MICROPLANCTON, PRODUCCIÓN Y DINÁMICA DEL AFLORAMIENTO EN SAGRES (SUROESTE DE PORTUGAL) DURANTE EL VERANO DE2001. -La comunidad microplanctónica, la producción y la respiración, fueron estudiadas en Sagres (SE Portugal) durante la época de afloramiento, de Mayo a Septiembre 2001, junto con parámetros físicos y químicos. La estación de muestreo está a 5 km Este del centro de afloramiento del Cabo S. Vicente, y a 2 km Oeste de una instalación para el cultivo de bivalvos. Según los patrones de la temperatura del agua de superficie (SST) se diferenciaron tres periodos: periodo 1 (P1; Mayo y Junio), caracterizado por temperaturas altas (17.0±1.8ºC); periodo 2 (P2; Julio), caracterizado por temperaturas más bajas (14.6±0.3ºC), identificado como un estado de -afloramiento; periodo 3 (P3; Agosto), caracterizado por un patrón de temperaturas altas (16.25±1.14ºC). Chaetoceros spp., Thalassiosira spp., Lauderia spp., Detonula spp. y Pseudo-nitzschia spp., fueron los principales grupos que contribuyeron a la diferenciación entre P2 (Julio) y el resto de periodos. Durante Julio (P2) la media de producción primaria bruta (GP; 52.5±12. ) alcanzaron sus valores máximos, simultáneamente con el pico de diatomeas-chl a. La respiración de la comunidad en la oscuridad (DCR) permaneció baja y constante durante el muestreo (4.6±3.6 µM O 2 d -1 ). La comunidad estaba dominada por diatomeas durante todo el muestreo. Los eventos físicos fueron el factor principal en la determinación de la estructura de la comunidad microplanctónica en esta localidad.

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Evidence for an enhanced substrate requirement by marine mesophilic bacterial isolates at minimal growth temperatures

Cited by 82 publications

References 44 publications

Use of Metabolic Inhibitors to Characterize Ecological Interactions in an Estuarine Microbial Food Web

Use of Metabolic Inhibitors to Characterize Ecological Interactions in an Estuarine Microbial Food Web

Experimental test of bacteria-phytoplankton coupling in the Southern Ocean

Microplankton composition, production and upwelling dynamics in Sagres (SW Portugal) during summer of 2001

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