There are lots of different waterways in Christchurch. Some are natural and some are artificial. Here is a natural one: the Otakaro River.
Ground water connects to springs because the water pops out of the ground and becomes a waterway. Springs are connected to waterways because the springs pop out of the ground and make a stream or river.
Our Local River Ecosystems
In a river ecosystem different creatures rely on other habits to survive. For example, the pukeko rely on vegetation because they can eat it. The shade from vegetation connects to the water temperature because certain invertebrates like the water cooler, rather than warmer.
There are lots of different interactors that show whether a river ecosystem is healthy or not.
It depends on the number and type of macro invertebrates. In a healthy river there would be good macro invertebrates like a mayfly larvae or stone fly or damselfly. In a unhealthy river there would be only snails and slugs and worms. Water temperature is another indicator. In a healthy river, the water temperature would be under 15 degrees. In a unhealthy river the water temperature would be over 15 degrees. Algae is another indicator. A good layer of algae would be very thin and a unhealthy layer would be very thick.
Testing our streams
In class we visited different streams, creeks, lakes and ponds. We tested the health of the river ecosystem. We used a clarity tube to see how clear the water was and if it has bad stuff in the river. We also used a trd which is also known as a sieve on a stick we used it to get the invertebrates and check what kind of invertebrates were in the river to check if the river healthy or not. We used a riparian habitat survey to find out the health of the river by assessing the streamflow, how stable the stream bank is and how much algae and a few other things.
We found that Dudley Creek wasn't excellent but it was good. The shade over the stream was a fair amount because only about a quarter of the stream has shade on it . The algae in the river is very thin because a very thin layer of algae is good and it provides food to invertebrates. The stream flow is fair because it is not too fast or not flowing it is just flowing medium. And the stream bank is fair, because there is only some plants to stop erosion.
The validity of this test is affected by the fact that people had different results on the river some people got poor fair good very good excellent.
Suggested changes :
- It could be better and we could plant some plants for more shade
- Or we could get some wood and make the stream bank more stable
- Get some more stones for rapids and riffles
Kaitiakitanga is a maori way of saying keep the stream and and environment clean for future generations because there is rubbish every where and it is bad for the environment.