Anthropogenic nutrient pollution of coral reefs in Southern Bahia, Brazil

Costa, Ozeas S.

doi:10.1590/s1679-87592007000400004

Cited by 18 publications

(9 citation statements)

References 44 publications

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“…It also showed a significant positive correlation with turbidity (r=0.63), indicating fluvial source, with higher values near the mouth of the river, decreasing towards the East. The values obtained in this study were similar to those observed by Koening and Macêdo (1999), with a variation of 1.42 µmol L -1 to 10.71 µmol L -1 in Itamaracá (State of Pernambuco), and those observed by of Costa (2007) that showed a variation from 2.13 µmol L -1 to 11.47 µmol L -1 in Porto Seguro (State of Bahia). They also noted a decrease in nutrient concentrations, increasing with the distance from the coast.…”

Section: T (°C)supporting

confidence: 89%

Different silicon forms sinalize an input of urbanized river and indicate the presence of phytoplankton with silicon structures in the tropical coastal area of Recife (PE-Brazil)

Bastos

Braga

2018

Braz. j. oceanogr.

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The urbanized areas mark its presence in the hydrological systems with some biogeochemical signs including silicon inputs. Natural influence of leaching and erosion is done by silicate contribution and sometimes, the agriculturally soil contains microphytoliths and contributes with biogenic silica. Once in the hydrological system, the silicon can integrate the biogeochemical cycles showing a balance or not between inorganic and biological forms that reveals a tendency of processes that occur in each sector of the estuarine-marine interface. This study aims to evaluate the impact of a heavily polluted/urbanized river, whose input can be evidenced by the contribution of different forms of silicon that can evidence the terrestrial contribution, erosion process, the presence of phytoplankton species with siliceous structures, mainly associated to diatoms and also, to study the river plume spreading on the coastal area by undertaking silicon profiles in the region adjacent to the river mouth. The coastal region of Recife is under influence of fluvial inputs from Capibaribe and Beberibe rivers verified by observed low salinity (min. 33.93). The distribution of silicon forms showed sectorial variation, and the maximum values were dissimilar. Dissolved silicate reached 14.40 µmol L-1, lithogenic silicon (LSi) maximum of 25.76 µmol L-1 and biogenic silica (BSi) reaching 7.39 µmol L-1 near the river mouth toward the sea, evidencing the river influence coming from the west, achieving the port barrier at the end and propagating in the sea toward northeast. Due to higher nutrient availability in the stations nearest to the coast, primary production was encouraged with evidencing by high values of chlorophyll-a associated to silicate (r=0.71) and to BSi (r=0.44). In the stations more distant to the coast, the forms of silicon showed very low concentrations and BSi/Chlorophyll-a showed negative correlation associated with chlorophyll-a concentrations evidencing the participation of non-silicon actors in the primary production in medium depth in oligotrophic tropical waters.

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Section: T (°C)supporting

confidence: 89%

Different silicon forms sinalize an input of urbanized river and indicate the presence of phytoplankton with silicon structures in the tropical coastal area of Recife (PE-Brazil)

Bastos

Braga

2018

Braz. j. oceanogr.

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“…2008), nutrification of coastal environments (Costa et al. 2000, 2008; Costa 2007), competition with aggressive exotic species (Paula & Creed 2004, 2005; Creed 2006) and other human impacts (Leão et al. 1994; Leão & Kikuchi 2005).…”

Section: Discussionmentioning

confidence: 99%

Implications of isolation and low genetic diversity in peripheral populations of an amphi‐Atlantic coral

2009

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Limited dispersal and connectivity in marine organisms can have negative fitness effects in populations that are small and isolated, but reduced genetic exchange may also promote the potential for local adaptation. Here, we compare the levels of genetic diversity and connectivity in the coral Montastraea cavernosa among both central and peripheral populations throughout its range in the Atlantic. Genetic data from one mitochondrial and two nuclear loci in 191 individuals show that M. cavernosa is subdivided into three genetically distinct regions in the Atlantic: Caribbean-North Atlantic, Western South Atlantic (Brazil) and Eastern Tropical Atlantic (West Africa). Within each region, populations have similar allele frequencies and levels of genetic diversity; indeed, no significant differentiation was found between populations separated by as much as 3000 km, suggesting that this coral species has the ability to disperse over large distances. Gene flow within regions does not, however, translate into connectivity across the entire Atlantic. Instead, substantial differences in allele frequencies across regions suggest that genetic exchange is infrequent between the Caribbean, Brazil and West Africa. Furthermore, markedly lower levels of genetic diversity are observed in the Brazilian and West African populations. Genetic diversity and connectivity may contribute to the resilience of a coral population to disturbance. Isolated peripheral populations may be more vulnerable to human impacts, disease or climate change relative to those in the genetically diverse Caribbean-North Atlantic region.

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“…Reduction in fresh SGD and the unpredictable location of reduction could result in significant social consequences to its users (Moosdorf & Oehler, 2017) and aquatic species dependent on either the associated reduced salinity or nutrient delivery. Reduced nutrient fluxes would be disadvantageous in oligotrophic systems (e.g., Kim et al, 2011;Rodellas et al, 2015) but could also have a positive impact in eutrophic environments (e.g., Costa, 2007;Prouty et al, 2017;Redding et al, 2013).…”

Section: Implications For Offshore Fresh Groundwater Exploitationmentioning

confidence: 99%

Offshore Pumping Impacts Onshore Groundwater Resources and Land Subsidence

Michael

2019

Geophysical Research Letters

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Freshened groundwater exists offshore along many coastlines worldwide. Pumping of these offshore resources has been proposed for more efficient oil production as well as drinking and agriculture. Although pumping can occur tens to hundreds of kilometers offshore, these activities may threaten connected onshore aquifer systems. We conducted numerical simulations of variable‐density groundwater flow and salt transport in coastal aquifers with different geologic structure subject to offshore pumping to assess potential impacts. Results show that offshore pumping can diminish both onshore groundwater availability and submarine groundwater discharge and can cause widespread land subsidence. Heterogeneity increases water resource vulnerability relative to equivalent homogeneous and layered systems and exacerbates the magnitude of land subsidence. More continuous geologic structure causes propagation of maximum subsidence farther landward. This work suggests that coastal aquifers may be vulnerable to offshore pumping activities and that these effects should be considered in feasibility assessments for offshore drilling.

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Anthropogenic nutrient pollution of coral reefs in Southern Bahia, Brazil

Cited by 18 publications

References 44 publications

Different silicon forms sinalize an input of urbanized river and indicate the presence of phytoplankton with silicon structures in the tropical coastal area of Recife (PE-Brazil)

Different silicon forms sinalize an input of urbanized river and indicate the presence of phytoplankton with silicon structures in the tropical coastal area of Recife (PE-Brazil)

Implications of isolation and low genetic diversity in peripheral populations of an amphi‐Atlantic coral

Offshore Pumping Impacts Onshore Groundwater Resources and Land Subsidence

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