Study

Regeneration of submerged macrophyte populations in a disturbed Lake Ontario coastal marsh

  • Published source details Lundholm J.T. & Len S.W. (1999) Regeneration of submerged macrophyte populations in a disturbed Lake Ontario coastal marsh. Journal of Great Lakes Research, 25, 395-400.

Summary

Action: Exclude wild vertebrates

A before-and-after study in 1996–1997 of a freshwater marsh in Ontario, Canada (Lundholm & Simser 1999) reported that after excluding large common carp Cyprinus carpio, the richness and density of submerged macrophytes increased. Statistical significance was not assessed. Approximately three months after carp exclusion, the marsh contained 11 submerged macrophyte species (vs before: 8 species). After carp exclusion, 11 of 12 transects supported submerged macrophyte at a density of 50–5,430 stems/ha (vs before: 3 of 12 transects; density: 5–420 stems/ha). Methods:  From spring 1997, a barrier system was used to prevent large carp (>40 cm long) from migrating into Cootes Paradaise Marsh from an adjacent lake (same study site as Smith et al. 2001). Submerged macrophytes were surveyed along 12 permanent transects, before (June 1996) and after (June 1997) operation of the fish barrier. Surveys only included macrophytes within 5 cm of the water surface, in open water areas.

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