Evidence of habitat fragmentation affecting fish movement between the Patos and Mirim coastal lagoons in southern Brazil

Burns, Marcelo D. M.; Garcia, Alexandre; Vieira, João Paes; Bemvenuti, Marlise A.; Marques, David da Motta; Condini, Mário V.

doi:10.1590/s1679-62252006000100006

Cited by 42 publications

(29 citation statements)

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“…In addition, this approach confirms the physiological and ionoregulatory mechanisms reported for fish found in estuarine regions (Elliott & Dewailly, 1995;Prodócimo & Freire, 2001;Garcia et al, 2003aGarcia et al, , 2003bGarcia et al, , 2004Burns et al, 2006;Freire & Prodócimo, 2007;Martinho et al, 2007;Da Rocha et al, 2009). Our findings also confirm results from earlier studies regarding the environments used by these fish species for feeding, reproduction and nursery grounds (Chao et al, 1985;Vieira & Castello, 1996;Garcia et al, 2003aGarcia et al, , 2003bGarcia et al, , 2004Burns et al, 2006).…”

Section: Discussionsupporting

confidence: 91%

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Plasma ion levels of freshwater and marine/estuarine teleosts from Southern Brazil

et al. 2011

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The purpose of this study was to investigate Na , and Mg 2+ levels in the plasma of freshwater and marine/ estuarine teleosts collected at different salinities (0 to 34) from the estuarine and freshwater portions of the São Gonçalo channel in Southern Brazil. Any relationship between plasma ion levels and salinity and the capacity of ionic regulation of teleosts found at three or more different salinities (Genidens barbus and Micropogonias furnieri) was also investigated. Results showed no relationship between plasma ion levels and salinity when considering all species together, but the two species collected from three or more different salinities showed a significant positive relationship between plasma ion levels and salinity, indicating that G. barbus and M. furnieri have a high capacity to regulate plasma ion levels at both low and high salinities.A proposta deste estudo foi investigar os níveis de Na , and Mg 2+ no plasma de teleósteos de água doce e marinhos/estuarinos coletados em diferentes salinidades (0 a 34) nas porções de água doce e estuarinas do Canal São Gonçalo, sul do Brasil. Uma possível relação entre os níveis iônicos plasmáticos e a salinidade também foi investigada bem como a capacidade de regulação iônica dos teleósteos coletados em três ou mais salinidades (Genidens barbus e Micropogonias furnieri). Os resultados mostraram que não houve relação entre os níveis iônicos no plasma com a salinidade quando considerando todas as espécies juntas, mas as duas espécies coletadas em três ou mais salinidades mostraram uma relação significativamente positiva entre níveis iônicos no plasma e salinidade, mostrando que G. barbus e M. furnieri apresentaram uma grande capacidade para regular os íons do plasma em baixas e altas salinidades.

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Section: Discussionsupporting

confidence: 91%

“…This natural channel is 75 km long, 200-500 m wide, 6 m deep, and is obstructed by the São Gonçalo dam to prevent salt water intrusion into the Mirim Lagoon during the dry season (Burns et al, 2006;Da Rocha et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Plasma ion levels of freshwater and marine/estuarine teleosts from Southern Brazil

et al. 2011

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“…This species has been caught in the Mirim Lagoon (Fig. 1), despite more than 30 years of isolation from estuarine waters (Burns et al, 2006). The Patos-Mirim Lagoon complex is an oligohaline-freshwater ecosystem and its southern area experiences the high variability of salinity characteristic of estuarine waters (Seeliger, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…Since then, the Mirim Lagoon has been characterized as a freshwater environment. Salinity variability of the Patos Lagoon estuary and Mirim Lagoon has been presented by Burns et al (2006).…”

Section: Introductionmentioning

confidence: 99%

Whitemouth croaker, Micropogonias furnieri, trapped in a freshwater coastal lagoon: a natural comparison of freshwater and marine influences on otolith chemistry

2010

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Strontium and barium incorporation into otoliths was compared between whitemouth croaker, Micropogonias furnieri, collected from an entrapped freshwater population (Mirim Lagoon) and a normal marine/estuarine population in southern Brazil. Chemical analysis was performed using LA-ICPMS with the objective of validating the effects of marine and freshwater environments on Sr and Ba incorporation as a basis for further investigation of marine and freshwater connectivity of M. furnieri. The freshwater population was dominated by older fish with mean ±SD age of 34±1 y, whereas the coastal samples were dominated by younger fish of 14±7 y. Comparison of strontium and barium incorporation among otolith life-history profiles indicated significantly higher barium and lower strontium for the freshwater population compared to the marine population. Furthermore, comparison of otolith material deposited in the freshwater, estuarine and marine life-history phases demonstrated clear differences among these environments. Mean concentrations of strontium and barium in otoliths of M. furnieri were respectively 710 and 112 μg g -1 for freshwater, 2069 and 16.7 μg g -1 for estuarine, and 2990 and 2.7 μg g -1 for marine life-history phases. Barium concentrations in otoliths from the freshwater population of M. furnieri appeared high relative to other freshwater species. Strontium levels across life-history profiles of marine fish increased with age from 2000 to 2900 μg g -1 , possibly indicating more time spent in marine than estuarine waters with age. In contrast, for the freshwater population, strontium levels decreased during the first year of life approximately to 700 μg g -1 , and remained low and stable thereafter, consistent with the early life-history occurring in an estuarine environment prior to entrapment in Mirim Lagoon. The results confirm the strong and opposite effects of marine and freshwater environments on incorporation of barium and strontium into otoliths, and indicate that the population of M. furnieri in Mirim Lagoon represents an isolated population that does not reproduce and is therefore likely to become extinct.Estrôncio e bário foram determinados em otólitos de corvina Micropogonias furnieri coletados em habitats de água doce (lagoa Mirim) e costeiros no Sul Brasil. As análises foram realizadas utilizando-se LA-ICPMS, com o objetivo de estabelecer assinaturas químicas específicas para os diferentes habitats e avaliar a aplicabilidade da química de otólitos para o estudo de mudanças de habitat na espécie em questão para futuros estudos sobre conectividade de populações. Os animais coletados na lagoa Mirim apresentaram idade média de 34±1 anos, não sendo observados adultos jovens ou juvenis. Foi verificada uma variação significativa nas concentrações de Sr e Ba em otólitos para áreas marinhas e de água doce. Para ambientes marinhos, a idade média foi de 14±7 anos. Os valores médios de Sr e Ba foram estimados, respectivamente, em 710 e 112 μg g -1 para água doce, 2069 e 16,7 μg g -1 para água estuarina e 2990 ...

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“…Por outro lado o prolongamento dos pontais são formações de bancos arenosos chamados de baixios (Vieira & Rangel, 1988). Estas interações físico-químicas levam ao "efeito remanso" que são áreas de acúmulo de nitrogênio, baixa profundidade e baixa turbulência (Menegheti, 2010 a lagoa é habitada por pelo menos 50 espécies de peixes (Sobrinho, 2009;Burns et al, 2006a;Garcia et al, 2006). A influência dos invertebrados nativos na riqueza de peixes está representada na Figura 3.…”

Section: Entidadesunclassified

Modelagem dos impactos ecológicos do projeto hidroviário da Lagoa Mirim (Brasil-Uruguai), baseada em Raciocínio Qualitativo

Goulart

Saito

2012

Braz. J. Aquat. Sci. Technol.

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This study is an application of the scientific mediation process through modeling the physical, chemical and biological impacts of a waterway construction in Mirim Lagoon. Qualitative modelling process, based on Qualitative Reasoning, was conduced to better understand the ecological impact on water environment. The qualitative reasoning simulation show clear trends towards a loss of the physiochemical natural characteristics of the lagoon ("backwater effect") and a decline of macrophyte, invertebrate, water birds and fish species. Furthermore, the simulation showed the spreading of the golden mussel (Limnoperma fortunei), which is an invasive species.

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Evidence of habitat fragmentation affecting fish movement between the Patos and Mirim coastal lagoons in southern Brazil

Cited by 42 publications

References 3 publications

Plasma ion levels of freshwater and marine/estuarine teleosts from Southern Brazil

Plasma ion levels of freshwater and marine/estuarine teleosts from Southern Brazil

Whitemouth croaker, Micropogonias furnieri, trapped in a freshwater coastal lagoon: a natural comparison of freshwater and marine influences on otolith chemistry

Modelagem dos impactos ecológicos do projeto hidroviário da Lagoa Mirim (Brasil-Uruguai), baseada em Raciocínio Qualitativo

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