Tomales bay metabolism: CNP stoichiometry and ecosystem heterotrophy at the land-sea interface

Smith, Stephen V.; Hollibaugh, James T.; Dollar, Steven J.; Vink, Sue

doi:10.1016/0272-7714(91)90055-g

Cited by 143 publications

(90 citation statements)

References 38 publications

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“…Although this assumption can be realistic in plankton-dominated systems (Smith et al 1991), biomass production and mineralization may not be well represented by this ratio in sites affected by benthic organisms such as seagrasses, microphytobenthos or salt marsh plants. Hillebrand & Sommer (1999) proposed a benthic algae C:P ratio of 159:1.…”

Section: Comparison and Evaluation Of The Different Approachesmentioning

confidence: 99%

Net ecosystem metabolism in a micro-tidal estuary (Randers Fjord, Denmark): evaluation of methods

Gazeau¹,

Borges²,

Barrón³

et al. 2005

Mar. Ecol. Prog. Ser.

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The metabolic status, the difference between organic matter production and consumption of an estuary (Randers Fjord, Denmark) has been assessed based on 2 field cruises in April and August 2001 and a number of approaches: (1) the oxygen (O 2 ) incubation method, (2) dissolved inorganic carbon (DIC) budgets, (3) the response surface difference (RSD) method based on diel O 2 changes and (4) land -ocean interaction in the coastal zone (LOICZ) budgets based on dissolved inorganic phosphorus (DIP). Although each method has its own associated limitations and uncertainties, the above approaches converged most of the time in consistent metabolic estimates, both in sign and magnitude, and revealed that this system was near metabolic balance in spring (net ecosystem production: NEP ~ 0) and net heterotrophic in summer (NEP ~ -50 mmol C m -2 d -1). In this shallow estuary (mean depth = 1.6 m), the benthic compartment was very active and represented 70 and 30% of the total gross primary production in April and August, respectively. NEP rates measured during this study are in the range of previously reported rates in estuaries.

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Section: Comparison and Evaluation Of The Different Approachesmentioning

confidence: 99%

Net ecosystem metabolism in a micro-tidal estuary (Randers Fjord, Denmark): evaluation of methods

Gazeau¹,

Borges²,

Barrón³

et al. 2005

Mar. Ecol. Prog. Ser.

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“…This autoctonous mineralization and alloctonous organic matter inputs turns the balance of autotrophic and heterotrophic processes to net heterotrophy (Hopkinson, 1985;Rowe et al, 1986;Smith et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

Short-term changes and longitudinal distribution of carbon metabolism in the Piauí River estuary (Sergipe, Brazil)

Souza

Couto

1999

Rev. Bras. Biol.

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Net pelagic metabolism (NPM) and net ecosystem metabolism (NEM) were assessed by ΣCO 2 changes in three sampling stations along Piauí River estuary. At the upper estuary station, sampling was carried out over 48 h. Samples exhibited high DIN:DIP ratios. Chlorophyll-a ranged from 0.2 to 2.5 µg.l . Bottom ressuspension due to microphytobenthic flotation and a high turbidity plume inside de estuary reflected in negative metabolic rates (mineralization). Benthic metabolism was inferred by net system minus pelagic metabolism. Microphytobenthic community seems to be the main responsible for system metabolism, specially in the upper estuary, although the anthropogenic inputs exert strong long term influence.Key words: estuary, short-term changes, primary production, mineralization, microphytobenthos. RESUMO

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“…Despite the considerable body of transported to the ocean or adjacent areas. Smith et al (1991) point out that the uptake or release of phosphorus can be interpreted to follow the general trend of nutrient uptake or release during oxidation of organic matter. However, the phosphorus transformation on aquatic ecosystems may suffer potential interference of abiotic reactions, such as adsorption-desorption or co-precipitation.…”

Section: The Functioning Process and Services Of Nclmentioning

confidence: 99%

“…However, it is actually more complex because of N 2 fixation and denitrification processes. Smith et al (1991) suggested, based on mass balance analysis, that these two processes could dominate the net nonconservative flux of nitrogen in coastal lagoons. Results that are consistent with smaller scale biochemical assays have been conducted in coastal lagoons (Seitzinger 1988).…”

Section: The Functioning Process and Services Of Nclmentioning

confidence: 99%

Neotropical coastal lagoons: an appraisal of their biodiversity, functioning, threats and conservation management

et al. 2008

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Neotropical coastal lagoons (NCL) are human-dominated ecosystems. Their distribution along densely populated coastal areas of developing countries makes these systems among the most threatened in the world. Here, we summarize some aspects of the causes and consequences of NCL biodiversity, their functioning, their importance to the surrounding populations, their fragility, and their responses to local and global anthropogenic impacts and the challenges that Neotropical countries face in conserving these systems. Although still scarce and geographically concentrated, a growing body of studies has shown that NCLs are physiographically diversified systems, which harbor a considerable and particular proportion of the Neotropical inland aquatic biodiversity. Despite the fact that coastal lagoons are ecotones that are intricately connected to surrounding environments, they develop mechanisms for structural and functional regulation, which confer to these systems higher productivity and carrying capacities than surrounding ecosystems. Such traits attract residential developments and subsidize local traditional populations with important economic and aesthetic ecosystem revenues such as fisheries and scenic beauty. However, the disorganized human occupation around NCLs are causing profound impacts such as eutrophication, salinization, exotic species introduction, as well as other effects, which are ultimately imposing major habitat degradations and biodiversity extirpations in NCLs. We argue that interdisciplinary conservation strategies, which integrate scientific expertise, government officials, private companies and the general public, are the most likely to overcome the geographic and economic obstacles to NCL conservation.Keywords: coastal ecosystems, ecosystem management, shallow lakes, human impacts, tropical limnology.Lagoas costeiras neotropicais: Uma apreciação sobre sua biodiversidade, funcionamento, principais ameaças e estratégias de conservação ResumoAs lagoas costeiras neotropicais (LCN) estão inseridas em um ambiente antropogênico. Sua localização em regiões costeiras densamente povoadas de países em desenvolvimento coloca estes ecossistemas entre os mais impactados do mundo. Neste trabalho, resumimos vários aspectos relacionados às causas e conseqüências da sua biodiversidade, seu funcionamento e os bens proporcionados à população do seu entorno. Sua fragilidade e as respostas a impactos humanos locais e globais, assim como os desafios para a sua conservação por países neotropicais, também são abordados. Apesar de escassos e geograficamente concentrados, um número crescente de estudos tem mostrado que as LCN são sistemas fisiograficamente diversificados, abrigando uma proporção considerável da biodiversidade dos ambientes aquáticos continentais neotropicais. Apesar de as lagoas costeiras representarem ecótonos bastante conectados ao ambiente adjacente, elas desenvolveram mecanismos próprios de regulação funcional e estrutural, conferindo uma maior produtividade e capacidade de suporte em relação...

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Tomales bay metabolism: CNP stoichiometry and ecosystem heterotrophy at the land-sea interface

Cited by 143 publications

References 38 publications

Net ecosystem metabolism in a micro-tidal estuary (Randers Fjord, Denmark): evaluation of methods

Net ecosystem metabolism in a micro-tidal estuary (Randers Fjord, Denmark): evaluation of methods

Short-term changes and longitudinal distribution of carbon metabolism in the Piauí River estuary (Sergipe, Brazil)

Neotropical coastal lagoons: an appraisal of their biodiversity, functioning, threats and conservation management

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