Monday 3 April 2017

New Zealand wetland and its motorway - Mixed messages on managing traffic in the 21st Century



Welcome to the Midnight Collective Broadsheet 135
Actively supporting NZ’s endangered wetland birds

Paradise duck and Grey Teal flocking over the recently opened M2PP expressway
The expressway was opened in a fanfare of self-congratulation but after an initial outbreak of universal happiness… (families, we can here reveal, have been traveling from Wellington (60km), to try out the new highway, whilst fighting over who is going to drive!!!)… reality is beginning to sink in.

Instead of clearing the traffic jam into Wellington each morning the expressway has doubled commuting time to an hour and a half, with jams recorded as far back as Porirua (23km). This follows the experience of all major motorway initiatives that simply shift jams to other areas as our roads fill with more and more and more traffic. (Most of our neighbours run two cars, with one having four parked up on the lawn).

In the meantime retail shops are recording significant drops in their monthly takings as the bypass takes effect.

The wetland areas opened up however, continue to provide a very positive story. This area had been designed to drain dry, and this fueled our initial pessimism about the future of the area, but though the area has been completely remade, we are continually surprised by what is going on down here. 
Dunelake prior to expressway excavation
Dunelake from google, prior to excavation
Excavations underway showing greatly enlarged areas. The green paddocks on the upper right are now a metre or more above the brown areas in the centre.
This area is usually dry between late January and early April but we now have water all year round. Because of the very wet summer (and now autumn), it is too early to predict this will be permanent, but in talking to one of the managers on site, it is clear the NZTA is also surprised by the permanence of the wetland area  opened  up. Their theory is that the area has been excavated below the local water table and if so, then this is likely to be permanent. The settling of the rear areas also appears to be aiding this with back flow occurring (outside the floods). 

The birdlife is showing its appreciation and appears not to be affected by the traffic flows close by. We now have wetland either side of the new road and while the original dune lake could host up to seventy birds, we have been sighting double this number, though their species variety has changed.
Paradise duck roosting- Western side of x/way
Paradise duck (up to 40) have settled permanently here since January, then mallard and parera-cross  ducks (50). Another prominent waterbird is the introduced Canadian goose, but what we are most delighted with is the colony of grey teal which were previously rare visitors.
Grey Teal roosting - west side
Around  twenty teal seemed to have found a base  here and they flock at times, mixed in with the paradise ducks (Putangitangi). Up to four pairs of pied stilt have also been resident over this summer. They have bred well  this year and  all going well, we should see more pairs of these elegant waders next year. 
anxious pied stilt parent investigates the photographer - x/way to left
One royal spoonbill seems to visit regularly but we still haven’t seen the rarer birds – scaup, shoveller, white faced heron and then the dabchick, while the local frog population has completely disappeared; though perhaps these will also return over time.           
Plantings on the east - mid December 
Same view a month later
The area has been replanted with local native species and here major problems are developing with weeds. This dune area provides extreme conditions with a swampy winter/spring and then drought-prone summers. We remain sceptical about the success of these plantings though they are off to a great start with the wet weather. However the weeds are making an even better start and here’s the evidence, above and below.
Dunelake west - rear mid December
Same spot a month later - weeded up
The NZTA are committed to a four year programme of weed control, when the natives should have developed a canopy to inhibit weed growth. We have experience in managing weed control programmes however and the moment you stop consistent  work on them is the moment  all your hard work slides into reverse. There are signs of weeding and spraying going on but it isn’t making much impact on the weeds in the lower reaches, although in this photo (below), the native rushes can be seen making a comeback and helping out. They should grow to dominate this area.
This channel appears to be draining the wrong way with wildling native rushes back taking over  
Meantime, here is another sign that the seasons are out of joint – a wary black swan female with her cygnets in mid-March (autumn over here), at Ratanui wetland. The father is out of the picture.
black swan family - Ratanui
Track we’ve been listening too while posting this? Well, we’ve been falling for Little Richard, all over again, because isn’t he adorable…  
Well, I saw Uncle John with long tall Sally
He saw Aunt Mary comin' and he ducked back in the alley 
oh baby 
Yeah baby, woo baby
Havin' me some fun tonight, yeah, 
Havin' some fun tonite.


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