Influence of the Hydrological Cycle on the Bacterioplankton of an Impacted Clear Water Amazonian Lake

Anesio, Alexandre M.; Abreu, Paulo César; Esteves, Francisco de Assis

doi:10.1007/s002489900035

Cited by 34 publications

(45 citation statements)

References 12 publications

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“…Even though Cabiúnas Lagoon exhibited higher mean temperature and DOC (Table II), the lowest bacterial carbon production was measured in this lagoon. Bacterial production observed in this lagoon was comparable to those of temperate lakes during autumn (Tulonen 1993) and lower than observed in other brazilian aquatic ecosystems such as the Patos Lagoon (Abreu et al 1995) or the Amazonian Lake Batata (Anésio et al 1997). The higher content of humic substances in this brown-water tropical lagoon may inhibit decomposition (Qualls & Haines 1990).…”

Section: Resultsmentioning

confidence: 84%

“…For instance, tropical freshwater communities are mainly regulated by variations in the hydrological conditions rather than by temperature (Junk & Furch 1993, Anésio et al 1997, Gomes & Agostinho 1997. As the temperature varies seasonally in temperate regions, primary and secondary production reaches a maximum during the warm months (Lampert & Sommer 1993).…”

Section: Introductionmentioning

confidence: 99%

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Bacterioplankton abundance, biomass and production in a Brazilian coastal lagoon and in two German lakes

Furtado

Casper

Esteves

2001

An. Acad. Bras. Ciênc.

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The bacterioplanktonic abundance, biomass, and production within a tropical lagoon (Cabiúnas, Brazil) and two temperate lakes (Stechlin and Dagow, Germany) were compared. Bacterial abundance and production were significantly different among the three water bodies. The lowest bacterial production (0.8µg C l -1 d -1 ) was observed in the tropical Cabiúnas Lagoon despite its higher mean temperature and dissolved organic carbon concentration. Highest bacterioplankton abundance (2.6 × 10 9 cells l -1 ) and production (68.5µg C l -1 d -1 ) were measured in eutrophic Lake Dagow. In oligotrophic Lake Stechlin, the lowest bacterial biomass (48.05µg C l -1 ) was observed because of lower bacterial biovolume (0.248µm 3 ) and lower bacterial abundance. Bacterial populations in the temperate lakes show higher activity (production/biomass ratio) than in the tropical lagoon. The meaning of isotopic dilution and leucine incorporation by non-bacterial micro-organisms were evaluated in the oligotrophic temperate system. Leucine uptake by non-bacterial micro-organisms did not have significant influence on bacterial production.

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Section: Resultsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Bacterioplankton abundance, biomass and production in a Brazilian coastal lagoon and in two German lakes

Furtado

Casper

Esteves

2001

An. Acad. Bras. Ciênc.

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“…in contrast, thirteen other relatively unpolluted tropical coastal lagoons in rio de Janeiro state have an average of 3.65 µg chl a l -1 (Farjalla et al, 2001). the observed initial bacterial abundance (3.4 x 10 9 cells l -1 ), biomass (2.4 µm c), and secondary productivity (0.032 µm c h -1 ) are within the range of most tropical freshwater ecosystems (torréton et al, 1994;Benner et al, 1995;lindell & edling, 1996;Anesio et al, 1997;thomaz & esteves, 1997;Bouvy et al, 1998). direct disposal of sewage into imboassica lagoon, although stimulating phytoplankton growth (melo, 2001), has not resulted in higher bacterial abundance, biomass, and secondary productivity than that found in other, less impacted Brazilian tropical coastal lagoons (Farjalla et al, 2001;Farjalla et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

Bacterial growth and DOC consumption in a tropical coastal lagoon

Farjalla¹,

Enrich‐Prast²,

Esteves³

et al. 2006

Braz. J. Biol.

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The aims of this research were to determine the main limiting nutrient to bacterial growth in Imboassica lagoon, southeastern Brazil, to estimate the percentage of dissolved organic carbon (DOC) available for bacterial growth, and to determine the bacterial growth efficiency (BGE) of natural assemblages. Bacterial growth and DOC consumption were determined in batch culture experiments, in which water samples were supplemented with nitrogen and phosphorus together or separately, or incubated without nutrient additions. When added together, N and P stimulated higher bacterial growth rates and production, as well as higher DOC consumption. The BGEs and DOC consumption rates were strongly dependent on the method used to determine bacterial production. The BGE ranged from 11 to 72%. However, only a minor fraction of bulk DOC was consumed by the planktonic bacteria (from 0.7 to 3.4%). The results suggest that low availability of phosphorus and nitrogen coupled with excess organic carbon was the main factor responsible for the relatively low bacterial utilization of DOC in Imboassica lagoon.

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“…Higher abundances of planktonic bacteria in the surface during light period suggest the important role of dissolved organic matter (DOM) released by algae for bacteria. However, the dependency of bacteria upon phytoplankton in floodplain lakes may be more typical of low water periods when there is little contact between the shallow lake water and river channel (Anesio et al 1997). In fact, it seems that during high waters, bacteria are much more dependent upon DOM from the flooded habitats (Anesio et al 1997, Castillo 2000, Carvalho et al 2003.…”

Section: Total Number Of Bacteriamentioning

confidence: 99%

“…The degree to which decadent algal and river suspended particles collect in backwater shallow lakes is not well documented. However, it is clear that in response to bursts of nutrients from sediments, shallow floodplain lagoons can exhibit marked increases in phytoplankton during low waters Huszar 2000, Ward et al 1999), which can supply great amounts of organic carbon for bacteria (Castillo 2000, Anesio et al 1997.…”

Section: Introductionmentioning

confidence: 99%

Diel Variation Related to Thermal Mixing in a Subtropical and in a North-Temperate Shallow Floodplain Lake

Lemke¹,

Pagioro

Lemke

et al. 2010

Journal of Freshwater Ecology

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Shallow floodplain habitats connected to large rivers undergo seasonal flooding making them integral parts of large river ecosystems. In tropical and subtropical regions, water mixing in these habitats is described as polymictic, yet little description exists for other large river floodplain lakes. In this study, the effect of thermal input on die1 mixing was compared between subtropical Gargas Lake (GL)(1.2 m depth) connected to the Parana River, Brazil and temperate Crane Lake (CL)(0.5 m depth) connected to the lllinois River, USA. Physical, chemical, and microbial variables were measured at 3 h intervals on clear, nearly windless (avg. < 1.2 m i') days in summer (GL, 8-9 Jan 02; CL, 8-9 Aug 02). Nocturnal, convective mixing was evident for temperature (range: GL, 28-33 "C; CL, 23-32 "C) and oxygen (range GL: 23-196%; CL: 24-200%) in each system by nightfall (l930h) and correlated with differences in nitrate and ammonia. Although total bacterial density differed between surface and bottom water samples by afternoon, it was similar at both depths by evening (CL, 2230h) or early morning (GL, 430h). Diel mixing occurred in both systems and has important implications in nutrient cycling, coupling of oxic-anoxic processes, and distribution of microbiota. INTRODUCTIONLarge river ecosystems are characterized by many aquatic and aquatic-terrestrial transitional habitats (Junk et al. 1989) and by hydrologic interactions between the main channel of the river and the surrounding floodplain (Ward and Stanford 1995). Historically, intact large river systems flooded annually, providing a pdse of water that moved from the channel over the surrounding floodplain. Periodic flooding was not an ecological disturbance but a natural trait of the system enhancing habitat diversity , species richness (Sparks 1995), and productivity (Junk et al. 1989). Shallow floodplain lakes, typically less than 3 m in depth, have intense sediment-water interaction (Scheffer 1998). These lakes are seasonally connected to rivers, comprise a prominent part of floodplains, and are extremely important components of these systems since they are permanent waterbodies where aquatic organisms find refuge during low water periods. 'Present address:

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Influence of the Hydrological Cycle on the Bacterioplankton of an Impacted Clear Water Amazonian Lake

Cited by 34 publications

References 12 publications

Bacterioplankton abundance, biomass and production in a Brazilian coastal lagoon and in two German lakes

Bacterioplankton abundance, biomass and production in a Brazilian coastal lagoon and in two German lakes

Bacterial growth and DOC consumption in a tropical coastal lagoon

Diel Variation Related to Thermal Mixing in a Subtropical and in a North-Temperate Shallow Floodplain Lake

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