I have been helping Forest & Bird campaign for the Sea Change – Tai Timu Tai Pari marine spatial plan. I talk about some of the work I am doing in the Gulf here.
I have been working with Northern New Zealand dotterel (NNZD) for nearly five years now. I know this bird really well but I had to look a lot closer when I decided to try and make a decoy. Southern New Zealand dotterel (SNZD) are in big trouble with a small and declining population. I decided to see if a decoy would work to help capture SNZD which have been difficult to catch outside of breeding season. A well placed decoy could help position one or more birds near a leg-hold noose-mat trap or in position for a canon net.
I put the decoy about 20m away from some NNZD at Point England and on both occasions each NNZD walked over to the decoy (with head bobs) in less than two minutes. They stayed just less than 1M away for two minutes before I removed the decoy.
I need to refine the plumage and add spikes to the removable legs but so far it looks promising.
I have been 3d printing New Zealand fairy tern decoys. It’s been a great challenge and a very worthwhile project. With help I have documented the why’s and hows on the Gulf Journal.
The population of any given species needs to be strong enough to handle destructive natural and made made events. Without this resilience one event can wipe a species of the face of the planet forever. In New Zealand our rarest endemic breeding bird is the New Zealand fairy tern. With a population of only 40 birds this is the breakdown for the 2017-18 season.
It’s a fragile population with too many males (1:2 ratio). The other major concern is that during breeding season 80% of the population is on the same 40km stretch of coast. Here is where the breeding happened in 2017-18:
The fragility is particularly exposed when we think about the threat of an oil spill from the RMS Niagara. This wreck is a time bomb just off the coast from this critical breeding habitat. Even a small amount of the submerged oil could easily cover the fairy terns breeding grounds for weeks, starving the birds to death in a matter of days.
I made iNaturalists observation of the week. Read about leaf-veined slugs here.
New Zealand has two praying mantises, the invasive South African praying mantis and the native New Zealand praying mantis. The easiest way to tell the two species apart is the shape of the head. The thorax (bit that connects their heads to their abdomens) is much wider on a New Zealand mantis so by comparison the South Africans look like hammerheads.
I have started work helping New Zealanders keep their Parks and Reserves. Building and Construction Minister Dr Nick Smith says that we have to “choose between using land for houses or cows”. This is ridiculous – saying our reserves are for cows is like saying Eden park is for lawn mowers!
Smil, V. 2003. The Earth’s Biosphere: Evolution, Dynamics, and Change, MIT Press