New Zealand Journal of Marine and Freshwater Research abstracts
A preliminary survey for crassulacean acid metabolism (CAM) in submerged aquatic macrophytes in New Zealand
D. R. WEBB
M. R. RATTRAY
J. M. A. BROWN
Department of Botany
University of Auckland
Private Bag, Auckland, New Zealand
Abstract
This preliminary survey covered 13 aquatic macrophytes present at two sites in Lake Taupo and two sites in the Auckland region (northern half of the North Island, New Zealand). Three species previously unrecorded as CAM plants,
Isoetes kirkii A. Braun,
Lilaeopsis lacustris Hill, and
Vallisneria spiralis Graeb., exhibited diurnal fluctuations in titratable acidity and malic acid content. The changes in titratable acidity varied seasonally from 97 (Dec. 1985) to 46 (June 1986) microequivalents per gram fresh weight for /.
kirkii, and from 40 to 23 and 51 to 26 microequivalents per gram fresh weight for
L. lacustris and
V. spiralis, respectively. The absence of CAM both in other members of the low mixed community and in other hydrocharitacean species at the same sites suggests that CAM can not be unequivocally regarded as conferring an ecological advantage to a species.
Keywords crassulacean acid metabolism; CAM; Isoetes kirkii; Lilaeopsis lacustris; Vallisneris spiralis
Received 14 May 1987; accepted 28 September 1987
New Zealand Journal of Marine and Freshwater Research, 1988, Vol. 22 : 231-235 Received 14 May 1987; accepted 28 September 1987
PDF file of entire paper: medium quality (376K); (scanned from paper original: notes about this process)
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