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

Bickel, T.O. and Closs, G.P. (2009) Impact of partial removal of the invasive macrophyte Lagarosiphon major (hydrocharitaceae) on invertebrates and fish. River Research and Applications, 25 (6). pp. 734-744.

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Article Link(s): http://dx.doi.org/10.1002/rra.1187

Publisher URL: http://onlinelibrary.wiley.com

Abstract

Invasive macrophyte species are a threat to native biodiversity and often grow to nuisance levels, therefore, making control options necessary. Macrophyte control can have pronounced impacts on littoral fish by reducing habitat heterogeneity and the loss of profitable (high density of invertebrates) foraging areas. Yet, there is little known about the impacts of macrophyte removal on invertebrates themselves. We conducted a macrophyte removal experiment, that is the cutting of channels into dense macrophyte beds, to investigate the impact of mechanical macrophyte control on invertebrate and fish communities in a littoral zone dominated by the invasive macrophyte Lagarosiphon major. The effect of macrophyte removal had only a temporary effect on macrophyte areal cover (4 months). Nevertheless, the treatment increased light penetration significantly. However, we could not detect any difference in epiphyton biomass. Invertebrate biomass increased in macrophyte stands 4 months after treatment and there was a shift in the invertebrate community composition. Mechanical control had no effect on invertebrate biodiversity. The higher invertebrate biomass did not translate into a higher fish density in the treated areas. The results of this study indicated that partial mechanical removal is a suitable option to control unwanted macrophyte stands.

Item Type:Article
Business groups:Biosecurity Queensland
Additional Information:© 2008 John Wiley & Sons, Ltd.
Keywords:Lagarosiphon major; invasive species; macrophyte control; invertebrates; littoral fish.
Subjects:Aquaculture and Fisheries
Science > Invasive Species > Animals
Deposited On:24 Jul 2012 05:40
Last Modified:24 Jul 2012 05:40

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