The History and Present Vegetation of the Macrophyte Swamp at Pukepuke Lagoon
- Department of Botany and Zoology, Massey University, Palmerston North, New Zealand
- Wildlife Service, Department of Internal Affairs, Private Bag, Wellington, New Zealand
- Present address: Department of Botany, Auckland University, Auckland, New Zealand.
Pukepuke Lagoon is one of a series of shallow dune-lakes in the Manawatu district of New Zealand. Its open water area has been reduced by about 90% during the last century by sand drift from adjacent dunes, man-made changes to the local drainage, and the spread of macrophytes) especially Typha, Superimposed upon these changes are others due to the influx of exotic plants and animals.
The vegetation of the macrophyte swamp is described in terms of the supposed sequence of hydroseral development. A reciprocal average ordination is used to describe the extensive Typha stands. The first axis of the stand ordination correlates with water depth, pH and the depth of the underlying organic matter. The second axis probably reflects stand disturbance. A species list is presented.