Contribution of ecosystem analysis to investigating the effects of changes in fishing strategies in the South Brazil Bight coastal ecosystem

Gasalla, Maria A.; Rossi-Wongtschowski, Carmem Lúcia Del Bianco

doi:10.1016/j.ecolmodel.2003.09.012

Cited by 55 publications

(25 citation statements)

References 51 publications

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“…Lagoon eutrophication has been documented as an effect of human population growth in urban centers with a deficient domestic effluent treatment system, provoking environmental impacts including: anoxia and hypoxia (SMITH et al, 2000;RABALAIS et al, 2009RABALAIS et al, , 2010 proliferation of toxic algae and death of aquatic organisms (WITEK;PLINSKI, 2000;FAUST;GULLEDGE, 2002;HEILEMAN;ROSSI-WONGTSCHOWSKI, 2004;GLIBERT et al, 2005) loss of batheability and increased waterborne diseases (FREITAS DE MAGALHÃES et al, 2001;LORENZZETTI, 2001;RODRIGUES et al, 2016); reduction of biodiversity (BRICKER et al, 1999;CLOERN, 2001;GLIBERT et al, 2010). These impacts are found in various Brazilian lagoons (SMITH et al, 2000;SANTORO;ENRICH-PRAST, 2012;COTOVICZ, 2013), including Lagoa da Conceição as reported in the present study.…”

Section: Efects Of Eutrophication On the Biogeochemical Cyclesmentioning

confidence: 99%

“…Choked lagoons in particular are characterized by high residence time associated with low water renewal rates, which leads to the accumulation of nutrients, sediments and organic matter (KJERFVE, 1994;KJERFVE, 1999;MIRANDA;CASTRO;KJERFVE, 2002;EKAU;KNOPPERS, 2003;BIANCHI, 2006;). In these environments, the excessive discharge of nutrients causes changes that lead to increasing levels of eutrophication, resulting in a decline of biodiversity, changes in the food chains, harm to human health and economic and social losses that are difficult to measure (NIXON, 1995;ROSSI-WONGTSCHOWSKI, 2004;TUNDISI, 2003;RABALAIS et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Space time evolution of the trophic state of a subtropical lagoon: Lagoa da Conceição, Florianópolis Island of Santa Catarina, Brazil

Silva

Franco

Fonseca

et al. 2017

RBRH

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High levels of eutrophication in coastal lagoons due to human activity have been documented worldwide. Among the main impacts observed are anoxia, hypoxia, toxic algal blooms, fish kills, loss of biodiversity and loss of bathing. This study aimed to evaluate the evolution of the trophic state of Lagoa da Conceição, a subtropical lagoon located in an urbanized watershed on the island of Santa Catarina -Brazil. Spatio temporal patterns of stratification and eutrophication were investigated to understand the main biochemical changes over time. The water quality data were obtained from field campaigns supplemented with literature of the last 15 years. The vertical structure of the water column and the trophic state were evaluated by the stratification index and the TRIX index, respectively. Analyses of variance were performed in order to identify possible temporal variations in vertical stratification and trophic level. Eutrophication effects on biogeochemical cycles were verified through a multi-dimensional cluster analysis (MDS) and correlations between variables related to physical, chemical and biological processes were verified by principal component analysis (PCA). The results showed that the water column is homogeneous in all regions except in the central region of the lagoon, and the highest ammonia concentrations and lowest dissolved oxygen concentrations with periods of anoxia are observed in bottom waters. The study looked at the high trophic level of the lagoon and its inability to process the biogeochemical changes imposed by urban development.Keywords: TRIX; Coastal lagoons; Stratification; Hypoxia; Biogeochemical cycles. RESUMONíveis elevados de eutrofização em lagunas costeiras devido à atividade antrópica têm sido documentados no mundo inteiro. Dentre os impactos observados pode-se destacar anoxia, hipoxia, floração de algas tóxicas, mortalidade de peixes, redução da biodiversidade e perda da balneabilidade. O presente estudo teve por objetivo avaliar a evolução do estado trófico da Lagoa da Conceição, uma laguna subtropical localizada em uma bacia hidrográfica urbanizada na Ilha de Santa Catarina -Brasil. Para compreender as principais modificações biogeoquímicas ao longo do tempo foram investigados os padrões espaço-temporais da estratificação e da eutrofização. Os dados de qualidade da água foram obtidos a partir de campanhas de campo complementados com dados da literatura dos últimos 15 anos. A estrutura vertical da coluna da água e o estado trófico foram avaliados pelo o índice de estratificação e o índice TRIX, respectivamente. Análises de variância foram realizadas com o objetivo de identificar possíveis variações temporais na estratificação vertical e no nível trófico. Efeitos da eutrofização nos ciclos biogeoquímicos foram verificados através de uma análise de agrupamento multidimensional (MDS) e correlações entre as variáveis relacionadas a processos físico-químicos e biológicos foram verificadas através da análise de componentes principais (PCA). Os resultados mostraram que há hom...

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Section: Efects Of Eutrophication On the Biogeochemical Cyclesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Space time evolution of the trophic state of a subtropical lagoon: Lagoa da Conceição, Florianópolis Island of Santa Catarina, Brazil

Silva

Franco

Fonseca

et al. 2017

RBRH

View full text Add to dashboard Cite

show abstract

“…The occurrence of upwelling is known to drive the ichthyoplankton assemblages in the eastern boundary coastal systems (Olivar and Shelton, 1993;Landaeta et al, 2008) and in the SBB , although it is generally considered weaker than the previous systems. The intrusion of the SACW toward the coast in the bottom layer is a hydrographic feature that enhances regional primary productivity and consequently, the fisheries (Brandini, 1990;Gasalla and Rossi-Wongtschowski, 2004). Studies have shown the tendency of the peak spawning period for some small pelagic fish species, as sardine and rough scad, during the spring and summer, when the intrusion of SACW over the continental shelf becomes more frequent Katsuragawa et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Patterns in larval fish assemblages under the influence of the Brazil current

Katsuragawa

Dias

Harari

et al. 2014

Continental Shelf Research

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“…This general pattern seems recurrent in marine ecosystems of tropical and temperate regions worldwide (see for example, Gasalla and Rossi, 2004;.…”

Section: Trophic Model: Ecosystem Flows and Structurementioning

confidence: 98%

An ecosystem modelling approach to deriving viable harvest strategies for multispecies management of the Northern Gulf of California

Lercari

Arreguı́n-Sánchez

2008

Aquatic Conservation

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ABSTRACT1. An ecosystem analysis was developed focusing on resource exploitation and biodiversity conservation for the Northern Gulf of California. The main tools employed were a trophic ecosystem model and time dynamic simulations.2. The ecosystem was represented by an Ecopath model that included 34 functional groups, from primary producers to top predators. It included relevant species in the area such as commercially important shrimp (e.g. Litopenaeus stylirostris) and highly endangered species (Phocoena sinus and Totoaba macdonaldi).3. Temporal simulations of changing fishing effort allowed the evaluation of fishing impact on the ecosystem components and, particularly, on protected species. Formal optimization methods were applied with the purpose of searching viable temporal patterns of fishing effort that might minimize social, economic and conservationist conflicts in the area.4. The results of those simulations showed the capability of the model to represent reference temporal series of relative biomass. The search for viable fishing strategies resulted in effort allocation consistent with those proposed by other studies; that is, a decrease in the industrial shrimp fleet (35-65%), a decrease in the gillnet fishing fleet (52-57%), and an increase of the artisanal shrimp fishery (63-222%).5. The main conflicts in the Northern Gulf of California seem to take place between social and conservation interests, while the economic and ecological benefits seem to be relatively independent. The next steps towards conflict resolution and ecosystem management should consider the design and operation of MPAs already established in the region.

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Contribution of ecosystem analysis to investigating the effects of changes in fishing strategies in the South Brazil Bight coastal ecosystem

Cited by 55 publications

References 51 publications

Space time evolution of the trophic state of a subtropical lagoon: Lagoa da Conceição, Florianópolis Island of Santa Catarina, Brazil

Space time evolution of the trophic state of a subtropical lagoon: Lagoa da Conceição, Florianópolis Island of Santa Catarina, Brazil

Patterns in larval fish assemblages under the influence of the Brazil current

An ecosystem modelling approach to deriving viable harvest strategies for multispecies management of the Northern Gulf of California

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