828f9006-2944-4616-96ab-03de34197382 eng Data curator NIWA curator@niwa.co.nz 2012-08-20T12:03:23 ISO 19115:2003/19139 1.0 SEAMOUNT RECOVERY PROGRAMME Clark, M.R.; Rowden, A.A. (2009). Effect of deepwater trawling on the macro-invertebrate assemblages of seamounts on the Chatham Rise, New Zealand. Deep-Sea Research I 56: 1540–1544. Clark, M.R.; Bowden, D.A.; Baird, S.J.; Stewart, R. (2010). Effects of fishing on the benthic biodiversity of seamounts of the “Graveyard” complex, northern Chatham Rise. New Zealand Aquatic Environment and Biodiversity Report No. 46. 40 p. Williams, A.; Schlacher, T.A.; Rowden, A.A.; Althaus, F.; Clark, M.R.; Bowden, D.A.; Stewart, R.; Bax, N.J.; Consalvey, M.; Kloser, R.J. (2010) Seamount megabenthic assemblages fail to recover from trawling impacts. Marine Ecology 31(suppl. 1): 183–199 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. Ministry for Primary Industries; Ministry of Businesss, Innovation, and Employment; National Institute of Water & Atmospheric Research Malcolm Clark National Institute of Water & Atmospheric Research Programme leader +64 4 386 0300 +64 4 386 0574 301 Evans Bay Parade, Hataitai Wellington 6021 New Zealand malcolm.clark@niwa.co.nz ocean benthic hard ecological video photograph seamount MEMP Permission required from NIWA for use of data. eng oceans Graveyard Seamount Complex, northern Chatham Rise 179.984 -179.836 -42.806 -42.696 2001-04-23T12:04:00 https://dc.niwa.co.nz/niwa_dc/srv/metadata/828f9006-2944-4616-96ab-03de34197382 WWW:LINK-1.0-http--metadata-URL Point of truth URL of this metadata record