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.


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.

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