New Zealand Journal of Marine and Freshwater Research abstracts

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Re-establishment of native macrophytes in Lake Parkinson following weed control by grass carp

CHRIS C. TANNER
ROHAN D.S. WELLS

Ruakura Agricultural Centre Ministry of Agriculture and Fisheries Private Bag, Hamilton, New Zealand

CHARLES P. MITCHELL

Fisheries Research Centre Ministry of Agriculture and Fisheries P.O. Box 6016 Rotorua, New Zealand

Abstract The macrophyte communities present in Lake Parkinson (37°19'S 174°41'E), a 1.9 ha eutrophic sand-dune lake, are described 5 years after removal of grass carp (Ctenopharyngodon idella Val; 218 kg ha"¹)- Eradication of the adventive submerged species Egeria densa Planchon (depen-dentonvegetau'vereproduction from stem fragments) as a result of grass carp stocking led to the re-establishment ofapredominantlynative macrophyte association from seeds, spores, and buried rhizomes after grass carp removal. Emergent Eleocharis sphacelata R. Br. re-established around the lake margins and throughout the lake's shallow southwestern arm, whereas submerged communities domin ated by Potamogeton ochreatus Raoul and Nitella hookeri A. Br. grew to a maximum depth of 5 m.

Keywords grass carp; aquatic macrophytes; revegetation; eradication; weed control; native plants

New Zealand Journal of Marine and Freshwater Research, 1990, Vol. 24:181-186 Gown copyright 1990
Received 25 September 1989; accepted 27 March 1990

PDF file of entire paper: medium quality (473K); (scanned from paper original: notes about this process)

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