In situ experimental study of the toxicity of crude oil and 2 additives to Rhizophora mangle seedlings

  • Published source details Scherrer P., Blasco F. & Imbert D. (1989) Etude experimentale in situ de la toxicite du petrole brut et de 2 additifs envers les plantules de Rhizophora mangle. Environmental Technology Letters, 10, 323-332.


This study is summarised as evidence for the following.

Action Category

Introduce tree/shrub seeds or propagules: brackish/saline wetlands

Action Link
Marsh and Swamp Conservation
  1. Introduce tree/shrub seeds or propagules: brackish/saline wetlands

    A replicated study in 1986–1987 in an experimentally degraded mangrove forest in Guadeloupe (Scherrer et al. 1989) reported >70% survival of planted red mangrove Rhizophora mangle propagules after approximately one year, and that the average height of saplings increased. Statistical significance was not assessed. Mangrove propagules were planted in oiled and non-oiled plots in March and July. After one year, the survival rate of propagules planted in oiled plots in July was 72–81% (data not reported for non-oiled plots). Across all treatments, healthy surviving saplings were 150–200 cm tall (vs 0 cm when planted as propagules). Saplings were 200–220 cm tall in non-oiled plots and 200–210 cm in plots sprayed with pure oil, compared to 150–180 cm in plots sprayed with oil and additives. Methods: In March and July 1986, mature, field-collected, red mangrove propagules were planted in four 2-m2 plots (72 propagules/plot) in a tidal mangrove forest that had been cleared for the study. Six plots (three plots/month) had been sprayed with 5L/m2 crude oil in early March. In four plots (two plots/month), the oil contained an additive (chemical dispersant, or a bioactivator to stimulate microbial activity). The height of healthy saplings (i.e. alive and not damaged by insects, crabs or falling branches) was measured every 50 days for approximately one year after planting.

    (Summarised by: Nigel Taylor)

Output references
What Works 2021 cover

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 20

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.

Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Bat Conservation InternationalPeople trust for endangered speciesVincet Wildlife Trust