Add cover other than mulch before/after planting trees/shrubs: brackish/saline wetlands

How is the evidence assessed?
  • Effectiveness
  • Certainty
  • Harms

Study locations

Key messages

  • One study evaluated the effects, on vegetation, of adding cover other than mulch to brackish/saline wetlands planted with trees/shrubs. The study was in Mexico.








  • Growth (1 study): One controlled study on a sandflat in Mexico reported that planted black mangrove Avicennia germinans seedlings grew more in height, over six months, when shaded with black mesh than when not shaded.

About key messages

Key messages provide a descriptive index to studies we have found that test this intervention.

Studies are not directly comparable or of equal value. When making decisions based on this evidence, you should consider factors such as study size, study design, reported metrics and relevance of the study to your situation, rather than simply counting the number of studies that support a particular interpretation.

Supporting evidence from individual studies

  1. A controlled study on a saltflat in western Mexico (Flores-Verdugo et al. 2015) reported that planted black mangrove Avicennia germinans seedlings grew faster when shaded than when exposed. Statistical significance was not assessed. Over six months, the height of seedlings planted in a partially-shaded area increased by 0.20 mm/day (from 7.1 cm when planted to 11.0 cm after six months. Meanwhile, the height of seedlings planted in unshaded areas increased by only 0.03–0.09 mm/day (from 6.5–7.2 cm when planted to 7.8–8.5 cm after six months). Methods: In August–September (year not reported), 600 nursery-reared black mangrove seedlings were planted alongside four excavated tidal channels on a bare saltflat. Seedlings were 50–100 cm apart. The 150 seedlings alongside one channel were shaded with black mesh, which blocked 50% of incoming light. The height of surviving seedlings was recorded for approximately six months.

    Study and other actions tested
Please cite as:

Taylor N.G., Grillas P., Smith R.K. & Sutherland W.J. (2021) Marsh and Swamp Conservation: Global Evidence for the Effects of Interventions to Conserve Marsh and Swamp Vegetation. Conservation Evidence Series Synopses. University of Cambridge, Cambridge, UK.

Where has this evidence come from?

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Marsh and Swamp Conservation

This Action forms part of the Action Synopsis:

Marsh and Swamp Conservation
Marsh and Swamp Conservation

Marsh and Swamp Conservation - Published 2021

Marsh and Swamp Synopsis

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