Comprises over 2,000 invasive plant survey results held by the Department of Conservation, New Zealand herbaria, and regional councils. The Pest Status and Aquatic Weed Risk Assessment Ranking of invasive plant species are also recorded.

Ocean acidification data from 14 sites from coastal New Zealand. Parameters include measured alkalinity, DIC, temperature and salinity, and calculated pH, carbonate ion concentration and aragonite saturation state. Data are available via the NIWA marine data portal website:https://marinedata.niwa.co.nz/nzoa-on?stage=Stage

These samples were collected from three locations in the Waimakariri River as part of a biodiversity survey. Subsamples were examined at x400 and an assessment made of the relative abundance of the main taxa present, on a scale of 1 (rare) to 8 (dominant). Identifications are to genus level, and to species level for some of the diatoms.

Over the past 20+ years the Cawthron Institute has accumulated a large store of information on the nation-wide distribution of freshwater invertebrates and algae. This dataset covers 20 years worth of macoinvertebrate and algal samples processed by Cawthron for regional councils State of the Environment monitoring, funded research work, resource compliance monitoring surveys, and assessments of environmental effects.

Samples were collected in a visiting scientist project (W. Vyverman, K. Saabe; University of Ghent, Belgium), within the FRST-funded freshwater biodiversity programme, in early 2001. All samples were benthic grab samples (composites of several subsamples). A comprehensive suite of environmental data (including water chemistry) was collected at the same time. Identifications were done at the University of Ghent, to genus level except for some probably endemic taxa. Voucher slides of each sample are held in the NIWA diatom collection (slide numbers are the same as the siteID).

These data incorporate the results of water quality monitoring carried out for the purpose of creating a calibration data set for establishing diatom species optima with regard to key water quality parameters

Macroinvertebrate abundance data from the littoral zone of a number of large New Zealand lakes

These data incorporate the results of water quality monitoring of lakes in the Rotorua region by Environment Bay of Plenty for the purpose of state of the environment reporting

Nine replicate quantitative samples were collected from 3 sites in the lower Waiau River as part of Meridian Energy's consent conditions, and 9 samples from a comparison site in the Mararoa River above the Manapouri Diversion. Samples have been collected annually (roughly) since 1997. A fourth site in the Lower Waiau (Weir) was surveyed up until 2002, after which the Mararoa site was added. Average abundance (9 samples pooled) of each taxon encounted at each site / date combination is reported on a 1 (rare) to 5 (abundant) scale.

These data are derived from diatom samples collected from throughout New Zealand from 1997 to 2004, from a broad range of freshwater habitats, as part of investigations into diversity patterns in freshwater diatoms