NIWA - Metadata Catalogue
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dataset
1190 record(s)
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The location and extent of Benthic protection areas designated in the exclusive economic zone.
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Physical, chemical and biological monitoring of water quality in estuaries within the Northland region for Northland Regional Council. Sampling sites are currently located in the Whangarei Harbour (WH), Bay of Islands (BOI) and Kaipara Harbour (KH), past data includes Hokianaga and Whangaroa Harours. Sampling frequency = 2monthly + 3 event driven sampling each year following heavy rainfall (WH, BOI), monthly (KH). Sampling began in 1986 (WH, BOI) and 2009 (KH) and is ongoing. Number of sites = 41 total currently. Since the start of the programme some sites have been dropped and some new sites have been added. Number of replicates = 1 per site. Measured variables = Water quality: salinity, DO%, DOmg/l, temp (YSI meter), Enterococci, faecal coliforms (Internal lab), TP, DRP, NNN, NH4, Turbidity (External lab), secchi, water depth (recorded in field). Sampling protocol & QA = Internal field monitoring manual and QA procedures. Water samples taken from top 0.5m of water column and sampling conducted at random tidal states, giving a more representative picture of water quality over time (WH, BIO) or high water (KH).
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Chemical monitoring of sediments in estuaries within the Northland region for Northland Regional Council. Sampling sites are located in the Whangarei Harbour and Bay of Islands, and include tidal creeks, mid-channel and open water locations. Sampling frequency = 2yearly (autumn). Sampling began in 2010 and is ongoing (at 2-yearly intervals). Number of sites = 32 total. Extent of site = 1800m2 (60m x 30m). Number of replicates = 5 per site. Measured variables = Sediment characteristics (grain size, TOC, TP, nitrogen, lead, zinc and copper). Sampling protocol & QA = Internal protocol and QA procedures. Sediment analysis external (Malvern Particle Analyser).
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Located in the Waikato Conservancy, this marine reserve was established in 1992. An initial baseline habitat survey was completed. Monitoring at this reserve targets subtidal reef benthic communities and key species (abundance and population size structure of mobile invertebrates, sessile invertebrates, algal communities and other selected key species (e.g. paua, kina) occurring on rocky reefs, boulder reefs, biogenic reefs); subtidal fish species associated with rocky reefs, boulder reefs, biogenic reefs; and targeted rock lobster monitoring surveys. Sampling frequency = irregular. Depths sampled: 0-20 m Methods used to collect data:UVC, BUV, photograph, Pot
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Temperature data between the surface and 850m deep from expendable probes (XBTs) dropped from container ships. See: http://www-hrx.ucsd.edu/
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Database for recording the samples, typically of invertebrate bycatch, including corals, but also fish, received from the Ministry for Primary Industries (MPI), formerly the Ministry of Fisheries, observers on commercial fishing vessels.
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Products of multi-beam surveys undertaken during the NIWA IPY-CAML using Tangaroa in January-March 2008. Kongsberg SIMRAD EM300 multi-beam data, processed, cleaned on board Tangaroa during the cruise. All data were converted to ESRI grid format and GeoTiff format for colour shaded relief.
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GeoTIFF of an interpolated surface to represent sediment and shell data. Spatial reference: GCS_WGS_1984
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The Graveyard seamount complex on the northern flanks of the Chatham Rise has several seamounts that have been managed as part of the seamount closures in 2001. The depths at which these seamounts exist are: 750-1250 m for peaks, and 1050-1600 m for seamount base. As part of this management, a directed survey was undertaken to map the distribution of fauna between seamounts with various levels of fishing effort. Images taken using NIWAs Deep Towed Imaging System (DTIS) provided the main data source. Surveys have been conducted on 3 occasions to collect image data of the benthic fauna/habitats to monitor changes over time: • seamounts open to fishing; • two unfished seamounts, now closed; and • one previously fished, now closed. This "natural experimental area" allows an evaluation of whether impacted habitat can recover over time following cessation of fishing, and the form the recovery may take. Measured variables: benthic mega epifauna Epibenthic sled: cod-end mesh size 25mm. Year of sampling: seafloor imagery with seamounts camera in 2001; NIWAs Deep Towed Image System (DTIS) in 2006 and 2009. Sampling frequency: 4 seamounts were sampled each survey, with up to 7 in 2006. The following seamounts were sampled each survey: Graveyard, Morgue, Gothic, and Diabolical. Temporal resolution of individual samples: continuous video, still images every 1 minute (2001), 30 secs (2006), 15 secs (2009). Sampling locations: at least 4 complete video transects on each seamount, with up to 8 transects on Morgue. Each transect was from the summit to the base of the seamount. Repear transects were made. Number of records: 2001 survey, 220 images; 2006 survey, 5097 images; 2009 survey, 8164 images. Still images generally showed 6-8 sq.m of seafloor. Other sampling method: epibenthic sled Positional accuracy: depth, latitude,and longitude are measured by a device (HPR) attached to the camera system deployed from NIWAs research vessel Tangaroa. Minimum size recorded: smallest megafauna 2-3 cm. Sampling protocols and quality assurance was imposed on the methods. There were checks between recorders and one person examined all the images. Data analysis: ongoing for a full comparison of the three surveys. Completed reports describing the surveys are listed above.
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Public presentation on sediment rates and sources of the Bay of Islands system. This presentation was given in the Bay of Islands, 13-14 July 2010, and described the methods and analyses undertaken during the BOI Oceans Survey 20/20 project.