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benthic invertebrates

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    An MS Access database on New Zealand and Antarctic Polychaeta taxonomy. It's linked to various other supporting databases including AllSeaBio.

  • This report describes data sets derived from benthic invertebrate samples collected during the Ocean Survey 20/20 Chatham-Challenger Hydrographic, Biodiversity and Seabed Habitats Project in 2007. Samples were collected from the Chatham Rise and the Challenger Plateau using several gear types: coarse mesh ‘seamounts’ epibenthic sled and beam trawl (sampling mega-epifauna); multicorer (meiofauna); fine mesh ‘Brenke’ epibenthic sled (macro-epifauna and hyperbenthic fauna); the still image camera of NIWA’s Deep Towed Imaging System (DTIS) (mega- and macro-epifauna, bioturbation, and substrate types), and the video camera of DTIS (mega-epifauna and substrate types). The report: (1) details the samples that were available for analysis, (2) describes the methods used to process and extract data from these samples, and (3) presents summaries of the final data sets.

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    Seabed sampling of the nearshore region of the STB was conducted during a 3-day field survey undertaken from the 28th February to the 2nd March 2013. Seabed habitats were characterised at 36 sites (26 nearshore sites and 10 cross-shelf sites), using underwater video footage and still images (photo-quadrats). Representative habitats were then sampled using a benthic grab for surficial sediments and a benthic dredge to collect surficial macrobenthic specimens. Ninety-two percent of the seabed along the nearshore region of the STB was characterised by extensive soft-sediments that supported few macrobenthic organisms. The remaining 8% of the seabed (five sites) comprised hard substratum in the form of either low to moderate relief hard rock (6%) or variable relief mudstone (2%) outcrops. In contrast to mudstone outcrops, which supported low or negligible amounts of macrobenthos, hard rock outcrops supported abundant and diverse assemblages, with the two dredges sampled at Site 5 and 6 accounting for more than 25% of all specimens and 61% of all species collected during the survey.