3.9 Article

Effects of automotive diesel oil on germination of Avicennia germinans and Laguncularia racemosa mangrove propagules

Journal

ACTA AMAZONICA
Volume 53, Issue 3, Pages 264-270

Publisher

INST NACIONAL PESQUISAS AMAZONIA
DOI: 10.1590/1809-4392202202342

Keywords

hydrocarbons; environmental tensors; Brazilian Equatorial margin; ecophysiological responses

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The study found that mangrove species differ in their sensitivity to diesel oil contamination, with Laguncularia racemosa being more susceptible than Avicennia germinans. This highlights the importance of considering species-specific responses when assessing the impact of oil spills on mangrove ecosystems.
Mangrove ecosystems are sensitive to oil, as spills can impair developmental processes of mangrove vegetation. Since the 2010s, the Brazilian equatorial margin, more specifically the Para-Maranhao Basin and the mouth of the Amazonas River, has been affected by oil runoff from urban activities and the increased risk from exploratory deepwater drilling for oil extraction. Dispersal of mangrove propagules occurs during the tidal cycles, when the presence of tensors in the water can affect germination. We analyzed the effects of diesel oil on the germination of propagules of the two most common mangrove species in the region, Laguncularia racemosa and Avicennia germinans, in six treatments of diesel oil in the water (0.5%, 1%, 1.5%, 2%, 3% and 4%) and a diesel-free control. The response variables were germinability (G%), mean germination time, mean germination speed and the germination speed index (GSI). G% and GSI in L. racemosa propagules differed significantly between the control and all treatments (G% and GSI < 10% in the 3% treatment). Propagules of A. germinans were more resistant, and the physiological variables did not differ significantly among treatments and control (G% > 90% in all treatments). Our results indicate that, at the germination stage, L. racemosa was more susceptible than A. germinans to contamination by automotive diesel oil.

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