Study

Vegetation change in created emergent wetlands (1988–1996) in Connecticut (USA)

  • Published source details Moore H.H., Niering W.A., Marsicano L.J. & Dowdell M. (1999) Vegetation change in created emergent wetlands (1988–1996) in Connecticut (USA). Wetlands Ecology and Management, 7, 1988-1996.

Actions

This study is summarised as evidence for the following.

Action Category

Reprofile/relandscape: freshwater marshes

Action Link
Marsh and Swamp Conservation
  1. Reprofile/relandscape: freshwater marshes

    A replicated, site comparison study in 1996 of seven freshwater marshes in Connecticut, USA (Moore et al. 1999) reported that created marshes had similar wetland plant richness, overall vegetation cover and woody plant cover to natural marshes, but greater cover of common reed Phragmites australis and cattails Typha spp. Statistical significance was not assessed. After 12–13 years, excavated marshes contained 25–53 wetland plant species (vs natural: 38–46 species) and had 80–123% total vegetation cover (natural: 90–130%). Key species with greater cover in created marshes included common reed (three of three comparisons; created: 2–29%; natural: <1%), narrowleaf cattail Typha angustifolia (three of three comparisons; <1–19%; natural: 0–11%) and broadleaf cattail Typha latifolia (two of three comparisons, for which created: 5–8%; natural: <1%). Woody plants had grown in both created marshes (10% cover) and natural marshes (16% cover). The study also reported data from 4–5 years after excavation (see original paper). Methods: In summer 1988 and 1996, vegetation was surveyed in four created marshes (excavated in 1983–1984) and three nearby natural marshes. All marshes were <1 ha, and the summer water table was 30 cm below to 22 cm above ground surface on average. Plant species and their cover were recorded in at least forty 1-m2 quadrats within vegetated areas of each marsh. This study used a subset of the marshes in (2).

    (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