Testing the relationship between primary production and Acartia tonsa grazing pressure in an estuarine lagoon

Calliari, Danilo; Britos, A.; Conde, Daniel

doi:10.1093/plankt/fbp049

Cited by 18 publications

(8 citation statements)

References 46 publications

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“…2, Figure 6C; Piccini et al, 2006). The difference between sites can mostly be explained by higher concentrations of nutrients and biomass of primary producers in the northern zone (Conde et al, 1999, 2000; Calliari et al, 2009), which in turn would fuel bacterial production (Cole et al, 1982). …”

Section: Discussionmentioning

confidence: 99%

“…In Phase I (homogeneous oligohaline brackish situation) high phytoplankton production and terrestrial input are expected across the whole lagoon as discharge proceeds from the watershed (Conde et al, 1999, 2000; Calliari et al, 2009). This situation would imply high system-wide DOC concentrations, which in turn will be similarly affected by UV radiation, as the optical characteristics of the lagoon are homogeneous (Conde et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

“…The hydrological cycle in Laguna de Rocha exerts a strong effect on different planktonic communities (Bonilla et al, 2005; Calliari et al, 2009; Britos, 2010), including the bacterioplankton. The pelagic microbial assemblages of the lagoon exhibit high abundances, productivity and diversity (Piccini et al, 2006; Thompson et al, 2011), and all these parameters are affected by the changes in environmental conditions during the different phases of the hydrological cycle (Piccini et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Environmental Dynamics as a Structuring Factor for Microbial Carbon Utilization in a Subtropical Coastal Lagoon

Alonso¹,

Piccini²,

Unrein³

et al. 2013

Front. Microbio.

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Laguna de Rocha belongs to a series of shallow coastal lagoons located along South America. It is periodically connected to the sea through a sand bar, exhibiting a hydrological cycle where physicochemical and biological gradients are rapidly established and destroyed. Its most frequent state is the separation of a Northern zone with low salinity, high turbidity and nutrient load, and extensive macrophyte growth, and a Southern zone with higher salinity and light penetration, and low nutrient content and macrophyte biomass. This zonation is reflected in microbial assemblages with contrasting abundance, activity, and community composition. The physicochemical conditions exerted a strong influence on community composition, and transplanted assemblages rapidly transformed to resembling the community of the recipient environment. Moreover, the major bacterial groups responded differently to their passage between the zones, being either stimulated or inhibited by the environmental changes, and exhibiting contrasting sensitivities to gradients. Addition of allochthonous carbon sources induced pronounced shifts in the bacterial communities, which in turn affected the microbial trophic web by stimulating heterotrophic flagellates and virus production. By contrast, addition of organic and inorganic nutrient sources (P or N) did not have significant effects. Altogether, our results suggest that (i) the planktonic microbial assemblage of this lagoon is predominantly carbon-limited, (ii) different bacterial groups cope differently with this constraint, and (iii) the hydrological cycle of the lagoon plays a key role for the alleviation or aggravation of bacterial carbon limitation. Based on these findings we propose a model of how hydrology affects the composition of bacterioplankton and of carbon processing in Laguna de Rocha. This might serve as a starting hypothesis for further studies about the microbial ecology of this lagoon, and of comparable transitional systems.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Environmental Dynamics as a Structuring Factor for Microbial Carbon Utilization in a Subtropical Coastal Lagoon

Alonso¹,

Piccini²,

Unrein³

et al. 2013

Front. Microbio.

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“…Concomitantly, a regular decrease in dissolved inorganic nitrogen forms, especially NH 4 + , has been detected in the water column between 1987 and 2003 . In fact, concentrations have ranged from 14 μM to undetectable levels (<0.1 μM) over time and there is apparently no clear temporal trend in the observed concentrations (Calliari et al, 2009). The inorganic nitrogen depletion in this system could be attributed to a nitrification-denitrification coupling taking place at the sediment level.…”

Section: Introductionmentioning

confidence: 75%

Incidence of phytoplankton and environmental conditions on the bacterial ammonium uptake in a subtropical coastal lagoon

et al. 2014

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“…Phytoplankton is an important food resource to many copepod species, to other pelagic microzooplankton (heterotrophic flagellates, dinoflagellates and ciliates) is the main food item (Calliari et al 2009). Whether phytoplankton or microzooplankton is the food base for copepods, the abundance of these organisms can be expected to decline with increasing distance from the mouth.…”

Section: Discussionmentioning

confidence: 99%

Seasonal and spatial distribution of mesozooplankton in a tropical estuary, Nha Phu, South Central Viet Nam

et al. 2013

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This study provides a description of mesozooplankton (holo-and meroplankton) abundance, biomass and diversity patterns inside and outside a tropical estuary (Nha Phu Estuary, Khanh Hoa, Viet Nam). In total 185 zooplankton species have been recorded during the study period (2009)(2010), copepods contribute with the largest share of species (more than 100), Tunicata with 20, Cnidaria with 17 and Chaetognatha with 9 species. At the most species rich site the number of zooplankton species varies between 55 and 123. The number of species and the annual variation in numbers declines towards the head of the estuary (14-37 species). In contrast, the highest numbers of individuals occur in the inner part of NPE. Calanoids that are the most abundant group of the copepods occur in densities up to 28.2 ind. L −1 (Aug. 9). At 'Outer NPE' and 'Outside NPE' the maximum density of calanoids is 5.8 and 10.7 ind. L −1 , respectively. The declining diversity of zooplankton towards the head of the estuary is also supported by various indices (Shannon's index, Margalef's index). A cluster analysis on similarity of species supports a clustering of the inner NPE sites vs the other sites. There is a general separation between the dominant copepod species in the inner (Bestiola sp., Acartia pacifica, Pseudodiaptomus incisus) and outer (Paracalanus gracilis, Acrocalanus gibber, Subeucalanus subcrassus, Oithona rigida, Corycaeus andrewsi, Oithona plumifera) part of the estuary though a few species are common in both areas (Paracalanus crassirostris and Euterpina acutifrons). The zooplankton community at the inner NPE is subjected to more variable hydrographic conditions (salinity in particular) than the communities at the other sites where more stable conditions prevail. A short residence time in the inner part of the estuary due to the tide is supposed to impede a strong horizontal structuring of the zooplankton community.

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Testing the relationship between primary production and Acartia tonsa grazing pressure in an estuarine lagoon

Cited by 18 publications

References 46 publications

Environmental Dynamics as a Structuring Factor for Microbial Carbon Utilization in a Subtropical Coastal Lagoon

Environmental Dynamics as a Structuring Factor for Microbial Carbon Utilization in a Subtropical Coastal Lagoon

Incidence of phytoplankton and environmental conditions on the bacterial ammonium uptake in a subtropical coastal lagoon

Seasonal and spatial distribution of mesozooplankton in a tropical estuary, Nha Phu, South Central Viet Nam

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