New Zealand Journal of Marine and Freshwater Research abstracts

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Aboveground biomass and productivity of submerged macrophytes in Lake Alexandrina, New Zealand

JONET C. WARD

JOY M. TALBOT

IAN D. STEWART

Centre for Resource Management Lincoln College Canterbury, New Zealand

Abstract Values for aboveground biomass (standing crop) from December 1982 to December 1985 at two sites in Lake Alexandrina (South Island, New Zealand) are reported. Weak seasonality was apparent for Chara fibrosa at 1.8 m, Elodea canadensis, Isoetes alpinus, and Chara globularis. The biomass of other species did not appear to be directly related to annual changes in solar radiation and water temperature. Annual growth for six species was estimated from annual changes in above-ground biomass and ranged from 296 mg C m^-2day^-1 (for E. canadensis) to 17 mg C m^-2 day^-1 (for Chara corallina). The growth of two species was also determined using short-term measurements of stem and branch length and gave estimates of 177 and 545 mg C m^-2 day^-1 for E. canadensis at two sites and 97 mg Cm^-2 day^-1 for Myriophyllum triphyllum.

Keywords Lake Alexandrina; aquatic macro-phyte; biomass; productivity; zonation; Characeae; Elodea; littoral zone

New Zealand Journal of Marine and Freshwater Research, 1987, Vol. 21: 215-221 0028-8330/87/2102-0215$2.50/0 © Crown copyright 1987 Received 28 July 1986; accepted 9 December 1986

PDF file of entire paper: medium quality (558K); (scanned from paper original: notes about this process)

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