Marta Comerma

Universitat de Barcelona

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KŠ

Karel Šimek

Czech Academy of Sciences, Biology Centre

Juan Carlos García

University of California, Santa Cruz

Joan Armengol

Universitat de Barcelona

Joan Armengol

Institut Català de la Salut

María del Mar Romero

Universidad Complutense de Madrid

Rafael Marcé

Centre d'Estudis Avançats de Blanes

Jiřı́ Nedoma

Institute of Hydrobiology, Biology Centre, Academy of Sciences of the Czech Republic

Petra Kojecká

University of South Bohemia in České Budějovice

Moisès Guardiola

Universitat Autònoma de Barcelona

Núria Benaiges i Abril

Cooperative Institutions

Universitat de Barcelona

Institut Català de Ciències del Clima

Universitat Politècnica de Catalunya

Institute of Hydrobiology, Biology Centre, Academy of Sciences of the Czech Republic

University of South Bohemia in České Budějovice

Consejo Superior de Investigaciones Científicas

Czech Academy of Sciences

Czech Academy of Sciences, Biology Centre

Barcelona Institute for Global Health

Universitat Autònoma de Barcelona

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Factors que expliquen la distribució de la vegetació de ribera a la conca de la riera d'Argentona

Atzavara, L' (2003)

Moisès Guardiola Marta Comerma Francesc Sabater Josep Parera

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Citations (1)

Four years of CO2 and meteorological measurements in Mataró (Catalonia, Spain). An example of the CO2 diurnal cycles in a Mediterranean coastal city.

EGU General Assembly Conference Abstracts (2014)

Roger Curcoll Masanes Anna Font Marta Comerma Josep-Antón Morguí Alba Àgueda

Diurnal cycle

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El valor dels espais agraris periurbans: el cas de les Cinc Sènies-Mata-Valldeix de Mataró

Atzavara, L' (2008)

Francesc Sabater Jordi Corbera Immaculada Valls Núria Benaiges i Abril Moisès Guardiola

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Influence of phosphorus and irradiance on phytoplanktonic chlorophyll-a concentration and phosphorus contents at a diel scale in a Mediterranean reservoir

Limnetica (2008)

Claudia Feijoó Marta Comerma Rafael Marcé J. Carlos García David Balayla

Influence of phosphorus and irradiance on phytoplanktonic chlorophyll-a concentration and phosphorus contents at a diel scale in a Mediterranean reservoirPhosphorus concentration in the water is one of the main factors regulating phytoplankton biomass and productivity in inland water bodies.However, phosphorus uptake by algae could not cause immediate growth, because other factors (light and other nutrient availability) may limit production.Nonetheless, "luxurious" phosphorus uptake (i.e.phosphorus uptake beyond the algal requirements) has been observed, and it has been interpreted as storage to use in situations of low nutrient availability.Thus, the assessment of the effect of phosphorus supply on algal growth is not straightforward, especially at very short time scales.In this study, we analyze the relationships between environmental phosphorus levels and internal phosphorus and chlorophyll-a contents in phytoplankton at a diel scale in a Mediterranean reservoir, considering the different algal (intracellular and membrane-associated) and water phosphorus pools.We also evaluated the influence of light on these relationships by sampling at two water depths with different irradiance levels.Our hypothesis is that chlorophyll-a and intracellular phosphorus contents in phytoplankton are both influenced by ambient phosphorus and irradiance levels, which are complementary resources for algae as the nutrient-light hypothesis proposes.Phosphorus concentration and relative contribution of each phosphorus fraction was similar at both sampling depths.Total phosphorus concentration was dominated by the particulate pool (70 %), and dissolved inorganic phosphate represented only one third of the dissolved pool.Total phosphorus content and the relative contribution of the different pools in algal cells were similar at both sampling depths.Intracellular phosphorus pool was on average 77 % of the total nutrient content, while phosphorus associated to membranes represented the remaining of the total pool.Mean intracellular SRP concentration was 36 % of the intracellular phosphorus content.None of the algal phosphorus pools showed significant correlations with underwater light levels at both sampling depths.Total chlorophyll-a concentration showed no significant correlations with the several water phosphorus pools at both sampling depths, because each algal group responded differently to environmental phosphorus levels, and these responses also varied with depth.We found significant relationships between the intracellular phosphorus content and the different phosphorus pools in water, but this almost 'automatic' response of algae to phosphorus levels in water was not reflected in changes in the chlorophyll-a content, at least within the 3-day time frame of this study.A possible explanation is that processes associated to nutrient uptake and biomass construction operate over different time scales.The results of this work emphasize the complexity of the links between environmental phosphorus concentration and phytoplanktonic phosphorus content and biomass, and the importance of scale in analysing such relationships.

Diel vertical migration

10.23818/limn.27.26

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Extracellular phosphatases in a Mediterranean reservoir: seasonal, spatial and kinetic heterogeneity

Freshwater Biology (2006)

Jiřı́ Nedoma Juan Carlos García Marta Comerma Karel Šimek Jan Mateu Armengol

Summary 1. Epilimnetic alkaline phosphatase activity (APA) was measured in longitudinal profiles of the canyon‐shaped, eutrophic Sau Reservoir (Catalonia, Spain) during the autumn, winter and spring periods of 1997–2000. 2. The spatial pattern of APA depended on lake circulation. During periods of stable stratification, when the ratio of mixed to euphotic depth ( z mix / z eu < 1.7) was low and the Chlorophyll a (Chl a ) concentration high, APA was also comparatively high (0.5–3.4 μ mol L −1 h −1 ) and located mostly in the >2‐ μ m size‐fraction. APA increased towards the dam at the same time as the concentration of soluble reactive phosphorus (SRP) decreased. In periods of unstable stratification, deep mixing ( z mix / z eu > 2.4) and low Chl a concentration, APA was low (<0.1 μ mol L −1 h −1 ) and without longitudinal changes, consistent with a high and stable SRP concentration. 3. A high input of mostly dissolved (in the <0.2‐ μ m size‐fraction) phosphatases from the river Ter was found in 1997–98. At the river inflow, independently of season and despite a continuously high SRP concentration, APA was approximately 0.7 μ mol L −1 h −1 and decreased towards the dam within the inflowing, canyon‐like part of the reservoir. 4. Analysis of saturation kinetics revealed the kinetic heterogeneity of APA. Low‐affinity APA was localised in the >2‐ μ m (algal) size‐fraction while, in the <2‐ μ m (picoplankton, mainly bacteria + dissolved) size‐fraction, high‐affinity APA, or a mixture of both, was found. The presence of two kinetic components, whose substrate affinities (i.e. in Michaelis constants, K m ) differed, was confirmed statistically in 13 of 18 cases analysed. The range of K mH values of the high‐affinity component was 0.15–2.4 μ mol L −1 , K mL values of the low‐affinity component ranged from 18 to 275 μ mol L −1 .

Picoplankton

Hydrobiology

10.1111/j.1365-2427.2006.01566.x

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Citations (46)

The Effect of River Water Circulation on the Distribution and Functioning of Reservoir Microbial Communities as Determined by a Relative Distance Approach

Ecosystems (2010)

Karel Šimek Marta Comerma Juan-Carlos García Jiřı́ Nedoma Rafael Marcé

Epilimnion

10.1007/s10021-010-9388-4

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Citations (26)

Carbon flow dynamics in the pelagic community of the Sau Reservoir (Catalonia, NE Spain)

Hydrobiologia (2003)

Marta Comerma Juan Carlos García María del Mar Romero Joan Armengol Karel Šimek

Microbial food web

Microbial loop

Bacterioplankton

10.1023/b:hydr.0000008511.45153.aa

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Citations (20)

The thermal structure of Sau Reservoir (NE: Spain): a simulation approach

Ecological Modelling (2000)

Han Bo-ping Joan Armengol Juan Carlos García Marta Comerma Montse Roura

Inflow

Outflow

Stratification (seeds)

Thermal Stratification

10.1016/s0304-3800(99)00176-3

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Citations (109)

Ecological role and bacterial grazing of Halteria spp.: small freshwater oligotrichs as dominant pelagic ciliate bacterivores

Aquatic Microbial Ecology (2000)

Karel Šimek Klaus Jürgens J Nedoma Marta Comerma Joan Armengol

AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials AME 22:43-56 (2000) - doi:10.3354/ame022043 Ecological role and bacterial grazing of Halteria spp.: small freshwater oligotrichs as dominant pelagic ciliate bacterivores Karel Simek1,2,*, Klaus Jürgens3, Jirí Nedoma1, Marta Comerma4, Joan Armengol4 1Hydrobiological Institute of the Academy of Sciences of the Czech Republic, and 2Faculty of Biological Sciences, University of South Bohemia, Na sádkách 7, 37005 Ceské Budejovice, Czech Republic 3Max Planck Institute of Limnology, PO Box 165, 24302 Plön, Germany 4Department of Ecology, University of Barcelona, Av. Diagonal 645, 08028 Barcelona, Spain *E-mail: ksimek@hbu.cas.cz ABSTRACT: We conducted extensive studies on bacterivory and bacterial production over several seasons in 2 reservoirs: the meso-eutrophic Rímov Reservoir in the Czech Republic and the highly eutrophic Sau Reservoir in Spain. Based on abundance, seasonal dynamics, and cell-specific uptake rates of different ciliate taxa, as well as heterotrophic nanoflagellate bacterivory, we were able to quantify bacterivory by individual ciliate species, total ciliates, and aggregated protists in these systems. With increasing trophic status, a higher portion of bacterial production was consumed by protists, and there was a greater importance of ciliate grazing, accounting for 40 and 50% of the total protistan bacterivory in the epilimnion of the Rímov and Sau reservoirs, respectively. Increases were attributable to the oligotrichs of the genus Halteria that often numerically dominate freshwater pelagic ciliate communities. In both reservoirs, the most important ciliate bacterivores in order of importance were: oligotrichs, primarily the bacterivorous Halteria spp., peritrichs, and scuticociliates. We also examined food vacuole content in natural populations of Halteria spp. to estimate the proportion of cells that had ingested algae. Our results and a review of previous reports on the abundance of Halteria spp. suggest that small halteriids are ecologically important bacterial consumers in meso- to eutrophic freshwater systems due to: (1) efficient uptake of prey over a large size spectrum (approximately 0.4 to 5 μm), (2) high clearance rates on picoplankton-sized particles along with (3) high potential growth rate, and (4) lower vulnerability to metazooplankton predation compared to other common pelagic ciliates. Correspondingly, we suggest a revised concept of planktonic ciliate bacterivory, where the principal role is attributed to small omnivorous filter-feeding oligotrichous ciliates. KEY WORDS: Halteria cf. grandinella · Oligotrichous ciliates · Feeding rates · Feeding ecology · Ciliate bacterivory · Reservoirs · Lakes Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 22, No. 1. Online publication date: July 21, 2000 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2000 Inter-Research.

Bacterivore

Epilimnion

Lake ecosystem

10.3354/ame022043

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Citations (97)

Planktonic Food Web Structure along the Sau Reservoir (Spain) in Summer 1997

International Review of Hydrobiology (2001)

Marta Comerma Juan Carlos García Joan Armengol María del Mar Romero Karel Šimek

We studied the planktonic food web in eutrophic Sau Reservoir (Catalonia, NE Spain). Along the longitudinal axis from the Ter River downstream to the dam, we characterized a microbial succession of food web dominance of bacteria-HNF-ciliates. The Ter River transports a large load of organic material into the reservoir, with a bacterial density of ∼9 · 106 large cells per ml. While at the first lacustrine station of the Reservoir HNF were the dominant bacterial consumers, at the others, an oligotrich ciliate, Halteria grandinella, was the main protozoan bacterivore. Most of the bacterial production in the reservoir epilimnion was consumed by grazing. The spatial succession of the reservoir microbial food webs was followed downstream by maximum densities of their potential predators among zoo-plankters – rotifers, and early developmental stages of copepods.

Microbial food web

Epilimnion

Dominance (genetics)

10.1002/1522-2632(200104)86:2<195::aid-iroh195>3.0.co;2-m

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Citations (23)