Study

Impact of partial removal of the invasive macrophyte Lagarosiphon major (hydrocharitaceae) on invertebrates and fish

  • Published source details Bickel T.O. & Closs G.P. (2009) Impact of partial removal of the invasive macrophyte Lagarosiphon major (hydrocharitaceae) on invertebrates and fish. River Research and Applications, 25, 734-744.

Summary

Action: Use cutting/mowing to control problematic plants

A replicated, randomized, paired, controlled, before-and-after study in 2004–2005 in a lake in Otago, New Zealand (Bickel & Closs 2009) found that cutting strips into beds of invasive curly waterweed Lagarosiphon major facilitated colonization of native submerged macrophytes in some plots, but had no significant effect on the biomass of algae growing on plants. After four months, cut plots had lower cover of curly waterweed (75%) than uncut plots (100%). Native macrophytes were present in 4 of 10 cut plots, although cover was ≤5%. There were no native macrophytes in uncut plots. The biomass (ash free dry mass) of algae growing on macrophytes was statistically similar in cut plots (0.015 mg algae/g plant) and uncut plots (0.012 mg algae/g plant). Methods: Ten pairs of plots were established near the shore of Lake Dunstan (water depth <3 m), in patches of curly waterweed (100% cover). In October 2004, macrophytes were manually cut and removed from three strips (2 m wide, 5 m apart) in one random plot/pair. No macrophytes were cut in the other plots. A diver surveyed the vegetation in February 2005. This included collection of three random plants/plot; algae were washed off these in the laboratory.

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