Water erodes the steep hill surfaces of much of the catchment and scours the banks of the many streams that flow into the Harbour.

1

How does algae support life of the stream?

2

What does sediment consist of?

3

What can rural land owners do to improve the quality of their streams?

4

How do wetlands protect the harbour?

6

How do councils work with rural land owners to protect waterways?

Tb1_jan_recreation
January

Recreation

Tb2_feb_fish
February

Fishing

Tb3_mar_shages
March

Shags

Tb4_april_pollution
April

Pollution

Tb5_may_tides
May

Tides

Tb6_june
June

Urban Catchment

Tb7_july
July

Pauatahanui Reserve

Tb_aug_sediment
August

Sediment

Tb_sept
September

Creatures Great & Small

Tb_oct1
October

The Rural Catchment

Tb11_nov
November

Industrial Catchment

Tb
December

The Future

Episode information

What is a podocarp forest?

A podocarp forest is an ancient coniferous forest consisting of large trees which have been present in New Zealand since Gondwanaland.    There is a good description at www.doc.govt.nz.

What is a catchment?

A catchment is an area from which precipitation drains into the harbour.   News about the harbour and catchment is available at the Porirua City Council website:  http://pcc.govt.nz.

What are Carbon Credits?

The government website www.climatechange.govt.nz describes New Zealand’s emissions trading scheme.

Tell me about the shrimps in the Horokiri Stream.

According to the NZ Native Freshwater Life website:

“New Zealand has only a single species of decapod freshwater shrimp; Family Atyidae: Paratya curvirostris, in the entire country. It is the southernmost member of its family the Atyidae whose distribution includes the western edge of the Pacific Ocean from Siberia, through Asia, Indonesia and Australasia. P. curvirostris is found only in New Zealand (i.e. it is endemic) and has been found all the way from Northland to Stewart Island, and on the Chatham Islands. As its distribution moves south its upper altitudinal limit decreases suggesting temperature is an important factor limiting this distribution.”  See more at http://nzfreshwater.org/shrimp.html.