No.19 2008

New measures for shellfish health

Colour clues to ocean productivity

Tidal creeks - important sinks for fine sediment

Gathering fishers' stories

Colour clues to ocean productivity

Colour clues to ocean productivity

Ocean colour measured by mean chlorophyll concentrations in phytoplankton, from the SeaWifs satellite ocean colour dataset 1997–2007.

The changing colour of the oceans has been captured by satellites over many years, and NIWA scientists are now analysing the images in a bid to understand ocean productivity.
Ocean colour varies through the seasons, according to the amount of phytoplankton (microscopic algae) at the ocean’s surface.

Tidal creeks - important sinks for fine sediment

Tidal creeks - important sinks for fine sediment

The silt-laden Mangemangeroa creek – taking sedimentation pressure off the Hauraki Gulf. (Photo: Andrew Swales, NIWA)

Tidal creeks that fringe many of our estuaries play an important role in trapping eroded catchment sediment. This is an unexpected finding of a three-year study in the Mangemangeroa Creek, one of many that connect catchments to the Hauraki Gulf.

Research subject: Oceans