Study

Environmental conditions of a backfilled pipeline canal four years after construction

  • Published source details Abernethy R.K. & Gosselink J.G. (1988) Environmental conditions of a backfilled pipeline canal four years after construction. Wetlands, 109-121.

Actions

This study is summarised as evidence for the following.

Action Category

Backfill canals or trenches: brackish/salt marshes

Action Link
Marsh and Swamp Conservation
  1. Backfill canals or trenches: brackish/salt marshes

    A paired, site comparison study in 1984 of a backfilled canal crossing predominantly brackish and saline marshes in Louisiana, USA (Abernethy & Gosselink 1988) reported that it developed coverage of emergent vegetation over four years, but that this remained lower than in natural marshes. Statistical significance was not assessed. In 65 of 83 sampled sections, emergent vegetation coverage was lower within the backfilled canal than in adjacent undisturbed marsh (data not clearly reported). Vegetation coverage in the backfilled canal varied with canal width, excavation method, substrate and coverage in the adjacent marsh (factors which were themselves correlated). The backfilled canal contained 2–10 submerged plant species, depending on salinity, with submerged vegetation present at 10–59% of sampling points (data not reported for undisturbed marsh). Methods: In 1979–1980, a canal dug for an oil pipeline was immediately but incompletely backfilled with spoil. The canal predominantly crossed brackish and saline marshes (94% of study area); data for freshwater marshes were combined with weakly brackish marshes. In August 1984, vegetation was surveyed in 83 sections of the canal (each 0.62 km long) and natural marsh adjacent to each section. Emergent vegetation coverage was estimated from aerial photographs. Submerged vegetation was sampled with a rake at 20 points/section.

    (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 18

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 Butterfly Conservation People trust for endangered species Vincet Wildlife Trust