Weak coupling of bacterial and algal production in a heterotrophic ecosystem: The Hudson River estuary

Findlay, Stuart E. G.; Pace, Michael L.; Lints, David; Cole, Jonathan J.; Caraco, Nina F.; Peierls, Benjamin L.

doi:10.4319/lo.1991.36.2.0268

Cited by 211 publications

(204 citation statements)

References 30 publications

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“…Coastal waters and especially estuaries are heterotrophic systems and mostly characterized by a larger gross respiration rate than primary production (Vadstein and Olsen 1989). Indeed, recent investigations in the estuary of the Delaware (Coffin and Sharp 1987), the St. Lawrence (Painchaud and Therriault 1989), and in the Hudson River (Findlay et al 1991) demonstrated that the algae-bacteria link is not statistically detectable when additional C sources are available for mineralization.…”

Section: Introductionmentioning

confidence: 99%

Distribution patterns of bacterioplankton and chlorophyll-a in the German Wadden Sea

Poremba¹,

Tillmann²,

Hesse³

1999

Helgol Mar Res

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In a first synoptic evaluation, the temporal and spatial distribution of bacterioplankton and chlorophyll-a were determined in the German Wadden Sea. Three surveys were undertaken in winter, spring, and summer of 1994 using up to eight ships simultaneously between the river Ems and Sylt island. Despite intensive hydrodynamic mixing of the Wadden Sea water, spatial gradients were obvious. The abundance of bacterioplankton ranged from 0.4 to 26×10 5 ml -1 and chlorophyll-a varied between <0.1 and 79 µg l -1 . In winter, relatively homogeneous distribution patterns of both parameters with small gradients were found. Highest chlorophyll-a values connected with a highly patchy structure were observed in spring, while in summer both total chlorophyll-a values and the complexity of the distribution pattern had decreased. In contrast, bacterial numbers increased steadily from January to July with the highest bacterial densities and greatest patchiness observed in summer. Moreover, in some regions of the Wadden Sea, a trophic succession of algae as carbon producers and bacteria as consumers was evident. Correlation analysis verified the relationship between bacteria and chlorophyll a, indicating bottom-up control of bacterial abundance in the northern part of the German Wadden Sea. Since the observed regression slope is remarkably low (0.12-0.46) compared to literature values (0.5-0.8), we suggest that the link between phytoplankton and bacteria found here is a special characteristic of the Wadden Sea as a transition zone between the coastal region and the outer North Sea.

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Section: Introductionmentioning

confidence: 99%

Distribution patterns of bacterioplankton and chlorophyll-a in the German Wadden Sea

Poremba¹,

Tillmann²,

Hesse³

1999

Helgol Mar Res

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“…The overwhelming majority of studies concerning freshwater microbial food webs have been conducted in lentic environments with comparatively little research focused on heterotrophic bacteria and protozoa in temperate rivers (Edwards & Meyer 1986, Carlough & Meyer 1990, Dolan & Gallegos 1991, Findlay et al 1991. The microbial food web could be particularly important to carbon and nutrient dynamics in rivers due to the often high loadings of allochthonous organic matter (Edwards & Meyer 1986, Findlay et al 1991, Sabater et al 1993, and low zooplankton abundances (Pace et al 1992, Basu & Pick 1996.…”

Section: Introductionmentioning

confidence: 99%

“…These webs can be visualized as 'microbial loops', in which heterotrophic bacteria convert dissolved organic matter of autochthonous or allochthonous origin into particulate organic carbon (Azam et al 1983, Berninger et al 1991, Findlay et al 1991). The heterotrophic bacteria are then grazed by heterotrophic flagellates and small ciliates (Porter et al 1985, Berninger et al 1991) which, in turn, may be consumed by larger ciliates, microzooplankton and cladocerans (Gasol & Vaqu6 1993).…”

Section: Introductionmentioning

confidence: 99%

Factors related to heterotrophic bacterial and flagellate abundance in temperate rivers

Pick²

1997

Aquat. Microb. Ecol.

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Thirty-one rivers of varying trophic status located in Ontario and Quebec, Canada, were sampled in order to determine the factors related to heterotrophic bacterial and flagellate abundance. Bacterial abundance ranged from 1.80 X 106 to 9.92 X 106 cells ml-' and flagellate abundance ranged from 1.18 X 103 to 17.4 X 103 cells ml-' There was a highly significant, positive relationship between bacterial abundance and both total phosphorus (R2 = 0.551 and chlorophyll a (R2 = 0.55). Bacterial abundance was not related to dissolved organic carbon concentration which ranged from 4.6 to 13.0 mg 1-' A significant positive relationship was observed between heterotrophic flagellate abundance and both heterotrophic bacterial abundance (R2 = 0.46) and total phosphorus (R2 = 0.52). Neither bacterial nor flagellate abundance was significantly related to water residence time. No relationship between zooplankton biomass and bacterial or flagellate abundance was observed, possibly because of the low biomass of zooplankton in the rivers (mean = 11.3 pg 1. ' dry mass). Results suggest that in rivers there is little transfer of energy from the microbial food web to the planktonic food web due to the scarcity of metazoan zooplankton.

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“…In Cabo Frio, the infl uence from the SACW resulted in the lower temperatures and higher N-NO 3 levels observed. In both areas the high DOM C:N ratios indicate the predominance of allochthonous DOM sources, rich in organic carbon (Findlay et al 1991). In Cabo Frio, despite the apparent lower infl uence of terrestrial inputs, DOM C:N was unexpectedly higher, which suggests smaller phytoplankton contribution to the DOM pool in comparison to Guanabara Bay, probably due to lower PP rates (Baines & Pace 1991).…”

Section: Discussionmentioning

confidence: 88%

“…On the other hand, when DOC sources are mostly allochthonous, there is no coupling between those plankton compartments and BP may exceed PP (e.g. Findlay et al 1991).…”

Section: Introductionmentioning

confidence: 99%

Bacterial and Phytoplankton Production in Two Coastal Systems Influenced by Distinct Eutrophication Processes

Guenther¹,

Valentin²

2008

Oeco. Bras.

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Evaluating the relationships between bacterial (BP) and phytoplankton production (PP) is a fi rst step to understand carbon fl uxes through pelagic food webs. In the present study, BP and PP were compared at two tropical coastal systems infl uenced by distinct eutrophication processes in order to assess the main regulating factors of particulate organic carbon (POC) production rates. The waters of Cabo Frio region (23 o 00'S; 42 o 00'W) present high nitrate (N-NO 3 ) levels and low temperatures resulting from the upwelling of deep water masses -thus, a natural eutrophication process -while the waters in Guanabara Bay (22 o 54'S; 43 o 09'W) present high temperatures and levels of dissolved organic carbon (DOC), nitrogen (DON) and nutrients (other than nitrate), resulting from anthropogenic eutrophication, mainly because of sewage wastes. Dissolved organic matter (DOM) elemental composition indicates lower autochthonous contribution in Cabo Frio (C:N ~ 42), probably due to lower phytoplankton production. The elevated temperatures in Guanabara Bay yielded higher PP rates, increasing the phytoplankton contribution to the DOM pool which improved BP. No coupling between BP and PP was observed, and POC production was mainly due to phytoplankton in both systems. Keywords: Guanabara Bay, Cabo Frio, upwelling, carbon cycling. RESUMO PRODUÇÃO BACTERIANA E FITOPLANCTÔNICA EM DOIS SISTEMAS COSTEIROS INFLUENCIADOS POR PROCESSOS DISTINTOS DE EUTROFIZAÇÃO.A avaliação das relações entre produção bacteriana (PB) e fi toplanctônica (PF) consiste em um primeiro passo para o entendimento dos fl uxos de carbono através das teias trófi cas pelágicas. No presente estudo, PB e PF foram comparadas em dois sistemas costeiros tropicais infl uenciados por processos distintos de eutrofi zação a fi m de se estimar os principais fatores reguladores das taxas de produção de carbono orgânico particulado (COP). A região de Cabo Frio (23 o 00'S; 42 o 00'W) apresenta altos teores de nitrato (N-NO 3 ) e baixas temperaturas devido à ressurgência de massas de água profundas -um processo de eutrofi zação natural, enquanto que a Baía de Guanabara (22 o 54'S; 43 o 09'W) apresenta altas temperaturas e altos teores de nutrientes (com exceção do nitrato), carbono e nitrogênio orgânicos dissolvidos (COD e NOD) resultantes de um avançado processo de eutrofi zação antrópica, principalmente através do lançamento de esgotos. A composição elementar da matéria orgânica dissolvida (MOD) indica menor contribuição de fontes autóctones em Cabo Frio (C:N ~ 42), provavelmente devido à menor produção fi toplanctônica. As altas temperaturas na Baía de Guanabara proporcionaram maiores taxas de PF, aumentando a contribuição do fi toplâncton para a MOD como um todo, o que resultou em um incremento da PB. Não foi observado acoplamento entre PB e PF e a produção de COP dos dois sistemas deveu-se principalmente ao fi toplâncton. Palavras-chave: Baía de Guanabara, Cabo Frio, ressurgência, ciclagem de carbono

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Weak coupling of bacterial and algal production in a heterotrophic ecosystem: The Hudson River estuary

Cited by 211 publications

References 30 publications

Distribution patterns of bacterioplankton and chlorophyll-a in the German Wadden Sea

Distribution patterns of bacterioplankton and chlorophyll-a in the German Wadden Sea

Factors related to heterotrophic bacterial and flagellate abundance in temperate rivers

Bacterial and Phytoplankton Production in Two Coastal Systems Influenced by Distinct Eutrophication Processes

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