Assessing Decomposition Rates of Rhizophora mangle and Laguncularia racemosa Leaves in a Tropical Mangrove

Oliveira, Alexandra Bomfim de; Rizzo, Alexandra Elaine; Couto, Erminda da Conceição Guerreiro

doi:10.1007/s12237-013-9627-y

Cited by 12 publications

(13 citation statements)

References 21 publications

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“…However, we found similar values during the winter, but they were lower than the summer values for R. mangle that were obtained by Aké-Castillo et al (2006) in the Gulf of Mexico, Juman (2005) in the Tobago, and also other studies in south and southeastern Brazil (Adaime, 1985;Panitz, 1986;Sessegolo and Lana, 1991;Silva et al, 1998;Barroso-Matos et al, 2012). On the other hand, when comparing our decay rates for R. mangle to those of the warmer regions in northeastern Brazil, higher values have been recorded in other studies (Oliveira et al, 2013;Table 4). This suggested increased photosynthetic production and a preferential use of this resource for the ecosystem food web (Vannote et al, 1980;Gessner et al, 1999).…”

Section: Regression Tree Of Abiotic Parameters On the Remaining Mass Of Leavessupporting

confidence: 69%

The effects of abiotic variables on detritus decomposition in Brazilian subtropical mangroves

et al. 2013

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AIM: The objective of this study was to determine the rate of decomposition of two dominant arboreal species (Rhizophora mangle and Avicennia schaueriana) in two Brazilian subtropical mangroves (Ratones and Itacorubi) and their relationship with abiotic factors during two periods of the year (winter and summer). METHODS: Senescent leaves (4 ± 0.1 g dry weight) were placed into litter bags (20 × 25 cm with 1 cm mesh size) and submersed in mangrove forests during a winter and a summer sampling period. Replicates (n = 4) of each detritus sample were obtained from the mangroves after 7, 15, 30, 60, 90 and 120 days of incubation during both time periods. During each period, in situ measurements were taken to obtain the temperature, electrical conductivity, pH, and dissolved oxygen in the water column. RESULTS: The species R. mangle and A. schaueriana exhibited slow rates of decomposition at Itacorubi and intermediate rates at Ratones during the winter, while quick rates were observed at both sites during the summer; this result suggested that water temperature is an influential factor. There was no difference in the loss of mass between the sites during the winter, but in the summer, the highest values were observed for R. mangle in Ratones site. The highest summer temperatures were negatively associated with mass loss, suggesting that the temperature is an influential factor. During the winter, remaining mass was associated negatively with electrical conductivity, possibly because of a greater resource available to decomposing communities, and it was also positively associated with oxygen, revealing a pattern opposite to that observed in the literature. CONCLUSIONS: Our results showed that decomposition accelerated with higher temperatures and that electrical conductivity decelerated with increased dissolved oxygen, confirming the effects of abiotic factors on both detritus decomposition and mangrove functioning.

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Section: Regression Tree Of Abiotic Parameters On the Remaining Mass Of Leavessupporting

confidence: 69%

The effects of abiotic variables on detritus decomposition in Brazilian subtropical mangroves

et al. 2013

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“…The CRE is a typical tropical estuary dominated by mangroves, which cover an area of approximately 13 km 2 of vegetation in shrub and semi-shrub stages and a restinga vegetation strip with trees and undergrowth vegetation over sandy deposits of Quaternary origin (Barbosa and Domingues 1996). The decomposition of Rhizophora mangle and Laguncularia racemosa leaves acts as a natural source of organic matter (OM) in the estuary (Oliveira et al 2013). The mangroves have been suffering serious damage from landfills, domestic and industrial effluent discharges, and the removal of sand from the river to meet construction demand (Fidelman 2005).…”

Section: Study Areamentioning

confidence: 99%

“…1 Sample stations in the Cachoeira River Estuary, the location of the sewage treatment plant (STP), the airport, the port of Ilhéus, and the Itacanoeira and Santana rivers. The dotted line delimits the upper and lower estuary (Lucio 2010;Oliveira et al 2013). This condition is made worse during periods of drought due to lower fluvial discharge (Lucio 2010).…”

Section: Study Areamentioning

confidence: 99%

Benthic Foraminiferal Response to Trace Elements in a Tropical Mesotidal Brazilian Estuary

Raposo

Frontalini

Clemente

et al. 2022

Estuaries and Coasts

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Living benthic foraminifera have been widely used as ecological indicators in coastal ecosystems. There is, however, a lack of studies on their response to trace element pollution in tropical estuarine systems. Here we analyze the living assemblages of benthic foraminifera, collected in 2016, in the Cachoeira River Estuary (CRE) in northeastern Brazil, to understand their response to natural and anthropogenic stressors, including trace element pollution. Some species were good bioindicators of specific environmental conditions, such as the agglutinant Paratrochammina clossi which preferred mangrove areas and anoxic conditions. In addition, the calcareous Ammonia tepida and Cribroelphidium excavatum, dominant within the whole system disregarding organic or trace element pollution, seem to resist even in the areas most polluted by trace elements. Interestingly, C. excavatum showed a particular positive relationship with trace element pollution (specifically by Cu and Pb), outnumbering the opportunistic A. tepida in the areas with higher pollution of these metals. However, for other species, it is still difficult to constrain to which parameters they respond (i.e., Haynesina germanica and Elphidium gunteri, which in the present study seem to respond to natural conditions, whereas in the literature they are regarded as indicators of trace element and organic pollution, respectively). Therefore, our findings shed light on the response of benthic foraminiferal species in a highly polluted and highly mixed tropical estuarine system and highlight the need to understand the complexity of these environments when applying foraminiferal biological indexes to avoid imprecise conclusions.

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“…Este fato pode estar associado a mudanças na energia da região entre margem-calha-margem que são evidenciadas pelos resultados da granulometria, e/ou pelo despejo pontual de resíduos antrópicos (Fidelman 2005;Silva, Souza & Abreu 2015;Souza et al 2005Souza et al , 2009). Como resultado da presença de vegetação de manguezal em quase todo o entorno do estuário, era esperado a grande concentração de MO nas estações amostradas (Oliveira, Rizzo & Couto 2013). Entretanto, os valores bem expressivos, acima de 40%, apontam para regiões que recebem diretamente grandes volumes de esgoto sem tratamento adequado, sejam elas por fontes difusas como na estação CH06-B, ou pontuais como na região de influência da ETE (CH09-C e CH10-C) que é caracterizada por fornecer apenas tratamento primário dos efluentes.…”

Section: Granulometria E Matéria Orgânicaunclassified

“…Pinho (2001), por sua vez, relatou evidências de eutrofização na porção mais interna do estuário, e Fidelman (2005) alertou sobre a deposição de esgotos não tratados e resíduos sólidos ao longo do estuário e no manguezal. Além dos efluentes antrópicos, o ERC recebe uma grande contribuição de MO do manguezal através da decomposição da vegetação principalmente de Rhizophora mangle (mangue-vermelho) e Laguncularia racemosa (mangue-branco) (Oliveira, Rizzo & Couto 2013).…”

Section: Introduçãounclassified

Indicadores Geoquímicos e Biodisponibilidade de Elementos-traço em Sedimentos do Estuário do Rio Cachoeira, Ilhéus - BA, Brasil

et al. 2021

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ResumoO estuário do rio Cachoeira (ERC) é maior estuário do sul da Bahia e recebe efluentes domésticos, agrícolas e industriais de treze municípios nos quais são potenciais fontes de matéria orgânica (MO) e de elementos-traço. Os estudos de caracterização ambiental realizados do ERC não contemplam a avaliação e caracterização de elementos-traços biodisponíveis no sedimento e sua relação com parâmetros ambientais e hidrodinâmicos. Este estudo teve como objetivo fazer a primeira avaliação da distribuição da fração biodisponível de elementos-traço no sedimento de fundo do ERC, a fim de reconhecer compartimentos ambientais e sedimentológicos associados ao grau de poluição e/ou de degradação ambiental. A amostragem foi realizada em novembro de 2016 ao longo de 30 estações pré-estabelecidas onde foram medidos em campo os parâmetros físico-químicos da coluna d'água e separado amostras destinadas as análises granulométrica e geoquímica. O estuário do rio Cachoeira mostrou grande heterogeneidade espacial das variáveis ambientais que é resultado tanto de ordem natural quanto antrópica. A influência marinha foi evidenciada por alto valores de salinidade e pH que se estende até 11 km da foz. A influência antrópica foi perceptível no aumento expressivo do percentual de MO nas estações próximas a estação de tratamento de esgoto e nas proximidades aos rios Itacanoeira e Santana. Altas concentrações de elementostraço biodisponíveis foram encontradas no sedimento, com destaque para o As, Cu, Hg, Ni, Pb e Zn que estavam em concentrações superiores aos limites estabelecidos por agência de proteção ambiental. A alta concentração de elementos-traço na fase biodisponível no ERC é resultado da alta hidrodinâmica local que é a característica de estuários de meso-maré bem misturados.

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Assessing Decomposition Rates of Rhizophora mangle and Laguncularia racemosa Leaves in a Tropical Mangrove

Cited by 12 publications

References 21 publications

The effects of abiotic variables on detritus decomposition in Brazilian subtropical mangroves

The effects of abiotic variables on detritus decomposition in Brazilian subtropical mangroves

Benthic Foraminiferal Response to Trace Elements in a Tropical Mesotidal Brazilian Estuary

Indicadores Geoquímicos e Biodisponibilidade de Elementos-traço em Sedimentos do Estuário do Rio Cachoeira, Ilhéus - BA, Brasil

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