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dunelands of the Manawatu are certainly distinctive and some of
the most representative of these can be reached via Scotts Ferry,
about 19 kilometres south-west of Bulls. These dunes are among
the most exacting environments to be found anywhere in this country,
with dessicating winds and temperatures, drifting sands, and low
nutrient levels.
In response to duneland conditions, a small group
of highly specialised plants has evolved, of which pingao, an
endemic sedge, and spinifex, a grass, are the most widespread.
Spinifex is found on most beaches in the North Island and in the
top half of the South Island, while pingao extends from North
Cape to Stewart Island and the Chathams. Pingao's graceful orange-green
leaves make it one of the dunelands' most colourful plants and
it was much used by the Maori for weaving. Despite its range,
pingao is now under threat from the planting of exotic plants
such as marram grass and tree lupin, both of which consolidate
sand and destroy the shifting sands pingao favours. Other duneland
plants are less common and some of them are becoming scarce. Among
these are the shore milkweed, the sand daphne and two ranunculi.
Any developed areas of the dune country are home
to a surprisingly wide range of fauna, both native and exotic.
Even the kereru relishes the protein-rich leaves of the nitrogen-fixing
legumes. Swamps, lakes, scrub and open pastureland are all found
here, along with sizeable stands of trees, and each of these habitats
supports its own particular communities. Exotic birds flourish
as do their enemies - rats, stoats and weasels.
In the winter great flocks of finches inhabit
the dunelands and feast on seeds. It is not altogether surprising
that the decline of the kakariki and the extinction of the native
quail (koreke), was accelerated by the introduction of these birds
and their competition for food. The native insect-eaters are doing
better against the foreign competition with large populations
of warblers, fantails, kingfishers, pipits and even fembirds to
be seen.
Waterbirds are in their element in the chain
of lakes and ponds in the hinterland of the dunes. Dabchicks and
a wide range of ducks, including the scarce grey teals, can be
found, together with herons, rails and a number of waders. Brown
teal were once found here as well but have now disappeared, possibly
because their habit of walking from the ponds or streams to their
nesting sites left clear tracks for predators to follow.