Spatial structuring of submerged aquatic vegetation in an estuarine habitat of the Gulf of Mexico

Burgos‐León, A.; Valdés, David; Vega, Ma. Eugenia; Defeo, Omar

doi:10.1017/s0025315412000677

Cited by 9 publications

(1 citation statement)

References 35 publications

(45 reference statements)

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“…In order to understand the spatial distribution of copper throughout the Guarapiranga ELU, a kriging interpolation method was implemented using Geovisual v. 5.0 software, following the procedure of Yamamoto and Landim (2015). This technique has been used in other similar studies (Smal, 2015;Batista, 2011;Alcantara, 2008;Burgos-León et al, 2012), and it has been shown to be an excellent tool for spatial analysis (Cressie, 1993;Camargo et al, 1999Camargo et al, , 2001Machado et al, 2004).…”

Section: Copper Spatial Interpolation and Spatial Analysismentioning

confidence: 99%

Impact of copper sulfate application at an urban Brazilian reservoir: A geostatistical and ecotoxicological approach

Leal

Moschini‐Carlos

López-Doval

et al. 2018

Science of The Total Environment

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A landscape ecotoxicology approach was used to assess the spatial distribution of copper in the recent bottom sediment (surficial sediment) of a Brazilian subtropical reservoir (the Guarapiranga reservoir) and its potential ecotoxicological impacts on the reservoir ecosystem and the local society. We discuss the policies and procedures that have been employed for the management of this reservoir over the past four decades. Spatial heterogeneity in the reservoir was evaluated by means of sampling design and statistical analysis based on kriging spatial interpolation. The sediment copper concentrations have been converted into qualitative categories in order to interpret the reservoir quality and the impacts of management policies. This conversion followed the Canadian Water Framework Directive (WFD) ecotoxicological concentration levels approach, employing sediment quality guidelines (SQGs). The SQG values were applied as the copper concentration thresholds for quantitative-qualitative conversion of data for the surficial sediment of the Guarapiranga. The SQGs used were as follows: a) interim sediment quality guideline (ISQG), b) probable effect level (PEL), and c) regional reference value (RRV). The quantitative results showed that the spatial distribution of copper in the recent bottom sediment reflected the reservoir's management policy and the copper application protocol, and that the copper concentrations varied considerably, ranging from virtually-zero to in excess of 3g/kg. The qualitative results demonstrated that the recent bottom sediment was predominantly in a bad or very bad condition, and could therefore have impacts on the local society and the ecosystem. It could be concluded that the management policy for this reservoir was mainly determined by the desire to minimize short-term costs, disregarding long-term socioeconomic and environmental consequences.

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Section: Copper Spatial Interpolation and Spatial Analysismentioning

confidence: 99%

Impact of copper sulfate application at an urban Brazilian reservoir: A geostatistical and ecotoxicological approach

Leal

Moschini‐Carlos

López-Doval

et al. 2018

Science of The Total Environment

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Evidence of rapid evolution of an invasive poaceae in response to salinity

2020

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Do interspecific competition and salinity explain plant zonation in a tropical estuary?

Nunes

Camargo

2016

Hydrobiologia

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Environmental gradients and competition influence aquatic macrophyte distribution in estuaries. The competition-to-stress hypothesis states that some species are excluded from lower estuaries (high salinity) due to abiotic stress and others from upper estuaries (low salinity) by competition. The growth of Crinum americanum L. and Spartina alterniflora Loisel. in monoculture (10:0/0:10) and mixed culture (5:5) under different salinity levels (4/12/26) was analysed by a laboratory experiment (3 cultures 9 3 sediment types 9 3 replicate) to understand the role of competition and salinity on the distribution of these species in a tropical estuary as well as to verify whether the competition-to-stress hypothesis explains their zonation. We tested the hypothesis that S. alterniflora is not established in the upper estuary due to the effect of competition with C. americanum, whereas the latter presents restrictions to high salinity and has greater competitive ability in the upper estuary. Our data confirm the competition-to-stress hypothesis but not as proposed originally. We conclude that abiotic stress (low nutrient availability) is responsible for the absence of S. alterniflora in the upper estuary and that the competition between the two species is responsible for the absence of C. americanum in the lower estuary.

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Spatial structuring of submerged aquatic vegetation in an estuarine habitat of the Gulf of Mexico

Cited by 9 publications

References 35 publications

Impact of copper sulfate application at an urban Brazilian reservoir: A geostatistical and ecotoxicological approach

Impact of copper sulfate application at an urban Brazilian reservoir: A geostatistical and ecotoxicological approach

Evidence of rapid evolution of an invasive poaceae in response to salinity

Do interspecific competition and salinity explain plant zonation in a tropical estuary?

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