aquatica (Keeley, 1998b), and, like terrestrial CAM plants lacking this enzyme (Kelly et al.
Gas exchange patterns for aquatic CAM plants are more complex than for terrestrial CAM plants due to multiple carbon sources and dynamic diel changes in availability.
2] uptake in terrestrial CAM plants (Kluge & Ting, 1978)--a surprising conclusion since, collectively, aquatic plants have substantially lower photosynthetic rates than terrestrial plants (Bowes & Salvucci, 1989).
This explanation is supported by the fact that terrestrial CAM plants exhibit [CO.
Succulence is a characteristic typical of a great many terrestrial CAM plants but is not characteristic of aquatic CAM plants.
Consistent with the pattern in terrestrial CAM plants, [Delta] [sup.
2] availability (Broadmeadow & Griffiths, 1993), which may account for the odd occurrence of terrestrial CAM plants in these habitats.
Pools that develop along temporary stream courses or within large drainage basins also seldom are dominated by CAM plants.
Lacustrine habitats dominated by CAM plants are generally softwater oligotrophic lakes, which are common at high latitudes or, in lower latitudes, only at high elevations.
Preference for oligotrophic conditions by aquatic CAM plants is similar to the pattern observed for terrestrial CAM plants.
CAM plants dominate under carbon-limited conditions, and as trophic conditions improve and free [CO.
The cuticle, a feature uncommon in aquatic plants (Sculthorpe, 1967), is quite apparent in many aquatic CAM plants and may be an important resistance factor.