Eutrophication processes and trophic interactions in a shallow estuary: Preliminary results based on stable isotope analysis (δ13C and δ15N)

Abreu, Paulo César; Costa, César Serra Bonifácio; Bemvenuti, Carlos Emílio; Odebrecht, Clarisse; Granéli, Wilhelm; Anesio, Alexandre M.

doi:10.1007/bf02781996

Cited by 57 publications

(30 citation statements)

References 24 publications

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“…Dominant floating and emergent macrophytes were collected by hand. Our d 13 C data for plants (including some previously published by Garcia et al, 2007) was complemented with information reported by Abreu et al (2006) for Patos Lagoon (Table 2).…”

Section: Regional Description and Study Sitesmentioning

confidence: 98%

“…Submerged aquatic vegetation abundance is from Costa et al (1997) and Rosa-Filho et al (2004). Mean d 13 C values from this study, Garcia et al (2007), and Abreu et al (2006) ground to a fine powder with a mortar and pestle and stored in clean glass vials. Sub-samples were weighed to the nearest 0.01 mg, and pressed into Ultra-Pure tin capsules (Costech Analytical, Valencia, California), and sent to the Analytical Chemistry Laboratory of the Institute of Ecology, University of Georgia, for analysis of carbon and nitrogen isotope ratios.…”

Section: Regional Description and Study Sitesmentioning

confidence: 99%

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Estuary hydrogeomorphology affects carbon sources supporting aquatic consumers within and among ecological guilds

et al. 2011

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The relative importance of carbon sources supporting aquatic food webs within and among estuaries may be influenced by factors that affect relative availability of autotrophic carbon sources, as well as movement of individuals among marine, estuarine and freshwater zones. We used stable isotopes of carbon and nitrogen to examine (1) the relative importance of carbon sources supporting estuarine consumers among estuaries with different hydrogeomorphic characteristics, (2) stable isotope signatures of consumer ecological guilds defined by dependence on estuarine habitats and residence time, and (3) if patterns in stable isotope signatures of ecological guilds repeat across estuaries with distinct hydrogeomorphological features. At the assemblage level, consumer carbon isotope signatures reflected the consumption of locally abundant primary production sources and differed across estuary types (choked lagoon, coastal river). Consumer ecological guilds differed in d 13 C within sites, and the same trend repeated across sites but with differing magnitudes. This variation is attributed to movement and residence patterns in addition to differences in the relative abundances of autotrophic sources across sites. Although within-estuary variation in consumer resource use is to be expected, estuarine food webs may be broadly classified according to landscapescale hydrogeomorphic factors that allow an initial prediction of the relative importance of carbon sources to secondary production. Predictions may be refined at the species level using knowledge of habitat use and residence time. Such predictions are useful as a starting point for poorly studied regions such as ours in southern Brazil, as well as for globalscale analyses of patterns in estuarine food webs.

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Section: Regional Description and Study Sitesmentioning

confidence: 98%

Section: Regional Description and Study Sitesmentioning

confidence: 99%

Estuary hydrogeomorphology affects carbon sources supporting aquatic consumers within and among ecological guilds

et al. 2011

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“…Indeed, excessive nutrient loading and eutrophication are stressing coastal marine environments throughout the world (Levin et al, 2015). The overabundance of nitrogen in particular the (nutrient usually limiting production (Herbert, 1999;Howarth and Marino, 2006)) causes changes in biomass, structure, and functioning of coastal communities and food webs (Abreu et al, 2006;Howarth et al, 2011;Rabalais et al, 2014). Yet, despite being of paramount importance to global environmental wellbeing, nutrient processing in soft sediments is still poorly understood and response to perturbations are rarely tested experimentally in situ.…”

Section: Introductionmentioning

confidence: 99%

In situ soft sediment nutrient enrichment: A unified approach to eutrophication field experiments

Douglas

Pilditch

Hines

et al. 2016

Marine Pollution Bulletin

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Adding fertiliser to sediments is an established way of studying the effects of eutrophication but a lack of consistent methodology, reporting on enrichment levels, or guidance on application rates precludes rigorous synthesis and meta-analysis. We developed a simple enrichment technique then applied it to 28 sites across an intertidal sandflat. Fertiliser application rates of 150 and 600 g N m −2 resulted in pore water ammonium concentrations respectively 1-110 and 4-580 × ambient, with greater elevations observed in deeper (5-7 cm) than surface (0-2 cm) sediments. These enrichment levels were similar to eutrophic estuaries and were maintained for at least seven weeks. The high between-site variability could be partially explained by the sedimentary environment and macrofaunal community (42%), but only at the high application rate. We suggest future enrichment studies should be conducted in situ across large environmental gradients to incorporate real world complexity and increase generality of conclusions.

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“…Este ecossistema oferece abrigo e hábitats para várias espécies de animais estuarinos e costeiros, sendo sua produção primária um importante componente da teia trófica na região estuarina , Costa 1998, Bemvenuti 1998, Seeliger 2001, Abreu et al 2006. …”

Section: Introductionunclassified

Diagnóstico ambiental das marismas no estuário da Lagoa dos Patos - RS

Marangoni¹,

Costa²

2009

Atlântica

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RESUMOAs marismas no estuário da Lagoa dos Patos vem sendo suprimidas desde o século XIX pela expansão urbana, portuária e industrial, entretanto, nos últimos 53 anos perdas de área foram causadas principalmente por processo natural (erosão). As atividades antrópicas no entorno das marismas vem causando modificações na cobertura vegetal, afetando processos biológicos e ecológicos. Este estudo visou identificar e quantificar os efeitos adversos das perturbações de origem antrópica (pastejo, fogo, corte da vegetação, lixo, construção de aterros e canais de drenagem) e de origem natural (erosão) sobre as marismas. As perturbações antrópicas e erosão foram quantificadas em intensidade e extensão, avaliadas através de transeções aleatórias. As marismas no estuário da Lagoa dos Patos apresentam algum tipo de perturbação que afetam a vegetação com baixa intensidade e moderada extensão (10-50 m). Das 23 unidades de marismas avaliadas foi possível detectar 4 grupos de unidades sob dominância de perturbações causadas pela agropecuária (11 unidades-pastejo), atividade urbana (5 unidades-lixo), fogo (4 unidades) e erosão (3 unidades). As marismas demonstram uma boa taxa de recuperação da cobertura vegetal (3 anos) após as perturbações, fazendo com que este ecossistema seja resiliente frente aos impactos ambientais avaliados (pastejo, fogo, lixo e corte da vegetação). PALAVRAS-CHAVE:Marismas, diagnóstico ambiental, atividades antrópicas, erosão ABSTRACT Environmental Assessment of saltmarshes at Patos Lagoon Estuary -RS Saltmarshes in Patos Lagoon Estuary have been converted since XIX century due to urban, port and industrial expansion, however in the last 53 years losses of saltmarshes were caused mainly by natural process (erosion). Biological and ecological processes in saltmarshes have been modified by anthropogenic activities, so this study aimed to identify and quantify the anthropogenic (grazing, fire, harvesting, litter, embankments, and man-made channels) and natural disturbances (erosion) on saltmarshes. Anthropogenic disturbances and erosion were quantified in intensity and spatial extension, evaluated through random transects. Saltmarshes showed some types of disturbance (anthropogenic and/or erosion) with low intensity and moderate extension (10-50 m). There are 23 saltmarsh units at Patos Lagoon Estuary, and it was possible to detect 4 main groups of units under different disturbances, caused by farming and ranching (11 unit-grazing), urban activities (5 unit-litter), fire (4 units), and erosion (3 units). Saltmarsh plants have showed good resilience by fast recovering (3 years) after anthropogenic disturbances (grazing, fire, litter and harvesting). KEY-WORDS:Saltmarshes, environmental assessment, anthropogenic activities, erosion INTRODUÇÃOAs marismas ocupam 70km 2 de áreas entremarés nas margens e ilhas no estuário da Lagoa dos Patos (RS) (Costa & Davy 1992, Nogueira & Costa 2003, Marangoni 2008. Este ecossistema oferece abrigo e hábitats para várias espécies de animais estuarinos e costeiros, sendo sua prod...

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Eutrophication processes and trophic interactions in a shallow estuary: Preliminary results based on stable isotope analysis (δ13C and δ15N)

Cited by 57 publications

References 24 publications

Estuary hydrogeomorphology affects carbon sources supporting aquatic consumers within and among ecological guilds

Estuary hydrogeomorphology affects carbon sources supporting aquatic consumers within and among ecological guilds

In situ soft sediment nutrient enrichment: A unified approach to eutrophication field experiments

Diagnóstico ambiental das marismas no estuário da Lagoa dos Patos - RS

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