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- Title
Salinity exacerbates oil contamination effects in mangroves.
- Authors
Naidoo, Gonasageran; Naidoo, Krishnaveni
- Abstract
The effects of salinity (10 and 50% seawater) and oil in combination on three mangroves, Avicennia marina, Bruguiera gymnorrhiza, and Rhizophora mucronata, were investigated. In all species, plant height, number of leaves, and CO2 exchange were generally higher in 10% than in 50% seawater. Salinity and oil decreased plant height, number of leaves, chlorophyll content, and CO2 exchange, with reductions being greater at the higher salinity. In a second experiment, the effects of salinity (0, 10, and 50% seawater) and oil on concentrations of ions, polycyclic aromatic hydrocarbons (PAHs), leaf ultrastructure, and salt secretion in A. marina were investigated. Salinity and oil in combination increased concentrations of Na+ but decreased those of K+, Ca2+, and Mg2+. PAHs caused damage to cell membranes, disrupted ion concentrations, and reduced salt secretion. This study demonstrated that increase in salinity reduces growth of mangroves and that salinity and oiling in combination exacerbate growth reduction. In A. marina, oil was absorbed and translocated to the leaves where it disrupted membranes, ion accumulation, and salt secretion.
- Subjects
MANGROVE plants; SALINITY; POLYCYCLIC aromatic hydrocarbons; VEGETABLE oils; CELL membranes
- Publication
Environmental Science & Pollution Research, 2021, Vol 28, Issue 48, p68398
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-021-15450-9