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Underwater Surveys (acquisition and/or analysis)

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  • The fish fauna of the edge of coral reefs in Torres Strait was investigated by underwater visual transects at 276 sites on 41 reefs between August 1995 and January 1996. The fish community contained most common families of tropical Indo-Pacific coral reefs. Acanthurids, Chaetodontids, Pomacentrids and Labrids were the most widespread and speciose families observed. The relative abundance of each species at each site was used to classify sites with multi-dimensional scaling (MDS). The species composition varied strongly across the region with sites classifying into four distinct groups. These represented groups of fish species most abundant on (1) the eastern outer ribbon reefs; (2) the mid- shelf reefs; (3) central Warrior reef complex and (4) the western reefs north of Moa Island. These patterns in fish community structure were related to changes in the relative proportions of the major benthic habitats in each area. Many species tended to be abundant either in areas of high coral cover (eastern outer ribbon reefs) or high algal cover (central and western reefs). Other factors that were correlated with fish species composition included the distance from sources of terrestrial runoff in Papua New Guinea and Cape York, northern Australia. This effect is likely to be indirect, through the influence of runoff of benthic habitats. These results show that fish communities in Torres Strait are strongly structured and influenced by the benthic habitats. The distribution of benthic habitats are in turn heavily influenced by the regional physical processes that occur because of the location of Torres Strait between Australia and Papua New Guinea. Refer to the published report: Milton DA and Long BG. (1997) Influence of Coastal Processes on Large Scale Patterns in Reef Fish Communities of Torres Strait, Australia. Final Report June 1997 (MR-GIS 97/6). CSIRO Marine Research, Cleveland. 14pp.

  • Dive surveys were conducted in 2015 and 2016 to establish a baseline and monitor the status of the critically endangered spotted handfish (Brachionichthys hirsutus) population. This dataset contains track records of variable length, GPS tracked underwater visual census transects conducted within 11 sites across the Derwent Estuary (n=9) and D'Entrecasteaux Channel (n=2). Records illustrated search effort (transect length, swathed area) and total fish sighted along each transect. Data were also presented in a standardised unit, with density estimates (fish per hectare [Ha]) extrapolated for each transect. In addition, this dataset also included information for each sighting of individual fish. This dataset contains size measurement (total length) and location (depth, latitude, longitude) records for each sighted fish.

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    A population survey of all sea cucumber species was carried out in east Torres Strait in January 2005. The survey was designed to provide information on the stock status of fished species and recovery of depleted species. Habitat data for comparison with previous years was also collected.

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    From April 2007 to June 2009, six field trips were undertaken to investigate the elasmobranch faunal composition of the Ningaloo Marine Park (NMP), determine the distribution and abundance of species, and examine the habitat utilisation, movement patterns and activity space of selected key species. Dive and longline surveys, passive acoustic telemetry and satellite tracking were used to collect data. Of interest to management, was whether existing sanctuary zones were effective for elasmobranchs as well as the location and timing of aggregation sites reported for some species. Satellite tagging data: Two types of platform transmitter terminals (PTTs) were used, Wildlife Computers (Redmond, USA) smart position or temperature transmitting tag (SPOT4 or SPOT5) and SPLASH tags. Longline survey data Longline fishing was used to survey elasmobranchs outside the reef and was carried out from the Western Australia Fishery Department vessel RV 'Naturaliste'. A total of 111 longline sets were made between Three Mile Camp towards the southern extremity of the Marine Park, to northeast of the Muiron Islands outside the northern limits of the Park; the distribution of these sets are shown in the thumbnail. Of these 111 sets, 17 were in sanctuary zones and 94 in non-sanctuary zones (in the thumbnail picture the hatched areas are sanctuary zones). Lagoon and reef edge dive survey data Snorkel and SCUBA underwater visual surveys were conducted as part of four field trips to Ningaloo in April and June 2007 and August and December 2008. The June and August surveys were restricted to the reef edge on SCUBA, while the April and December surveys were mainly on snorkel and in the lagoon. While the original intention was to provide coverage through the different seasons, poor weather conditions coincided with most of the planned fieldwork (including cyclone 'Nicholas') resulting in re-scheduling of some trips. A total of 137 sites were surveyed between Vlaming Head on the northeast of the Cape to Gnaraloo in the southern part of the Marine Park (see thumbnail picture). Of these surveys, 89 were in sanctuary zones and 48 in non-sanctuary zones (sanctuary zones are shown as hatched in the picture). Acoustic data Elasmobranchs were tagged with acoustic tags and subsequently monitored with acoustic receivers (Vemco VR2, VR2W and VR3) moored on the seabed that constitute the Ningaloo Reef Ecosystem Tracking Array (NRETA). This array is part of the nationwide network of marine acoustic monitoring, the Australian Acoustic Tagging and Monitoring System (AATAMS). A total of 96 acoustic receivers are deployed at Ningaloo Reef between Coral Bay and Tantabiddi. A total of 56 acoustic tags were deployed on six species of sharks and three species of rays in the Ningaloo Marine Park in February 2008. Data is accessible through the IMOS AATAMS website 11 Nervous Sharks (Carcharhinus cautus) 10 Giant Shovelnose Rays (Glaucostegus typus) 9 Blacktip Reef Sharks (Carcharhinus melanopterus) 9 Grey Reef Sharks (Carcharhinus amblyrhynchos) 8 Cowtail Stingrays (Pastinachus atrus) 4 Porcupine Rays (Urogymnus asperrimus) 4 Lemon Sharks (Negaprion acutidens) 1 Tiger Shark (Galeocerdo cuvier) 1 Whitetip Reef Shark (Triaenodon obesus)

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    The Ningaloo Marine Park (State Waters) Plan 1989 was designated A class in 1990. A review of the Management Plan began in 2000; this resulted in a revised Management Plan being approved by the Minister in January 2005. Changes in the current Management Plan include extending the Marine Park southwards to incorporate the full extent of the reef, increasing the number and extent of Sanctuary Zones, introducing Special Purpose Benthic Protection and shore-based line fishing zones. The purpose of this project is to assess the effectiveness of 1989 Management Plan and also provide what will become the first data point in a long-term data set. These data will become an integral part of several sections of the NRP, evaluating the effectiveness of zoning for biodiversity conservation, assessing the implications of zoning for fish populations and for fishing outside sanctuary zones. The surveys will provide data not only for newly established zones, but also for those zones already established within the park under previous zoning provisions. Where possible the survey will build on existing data sets, though these are limited in scope and spatial extent. Objectives For fish taxa targeted by anglers (e.g. labridae, lethrinidae, lutjanidae, serranidae, carangidae): - Measure the distribution, abundance and size-structure of key fish populations at Ningaloo - Provide data that will allow a quantitative comparison of these parameters to be made across Ningaloo Marine Park zones (pre-2005 sanctuary zones, new sanctuary zones, benthic protection zones, recreational zones and general use zones). - Provide data that will form the basis for being able to: - Measure the rate and magnitude of any changes in fish population size or structure related to changes in marine park zoning - Determine how responses of fish populations may vary with respect to factors such as size of reserve, type of reserve, distance from boundary and fish life-history - Parameterize and test spatially-explicit models of fish populations.

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    This record describes the collections of sediments (and their derived data) from one Marine National Facility charter voyage conducted under Project 4 - Benthic biota of volcanic seamounts, seeps and canyons of the GAB - of the Great Australian Bight Deepwater Marine Program (GABDMP): IN2015_C01. A key objective for which is to characterise the composition, abundance and distributions of benthic fauna (seabed animals) associated with volcanic seamounts, canyon and seep zone habitats in in ~1000-5000 m depth, within and adjacent to the Chevron lease areas in the GAB. Sediment samples were taken at 6 potential seep, 5 volcanic seamount, and 3 deep outcropping rock sites using the Integrated Coring Platform (ICP) and the Smith-MacIntyre grab. The Integrated Coring Platform ( ICP) combines a number of technologies to maximise sampling in a single deployment. The ICP is built around a 6 barrel corer (KC, Denmark) and together with its central electronics module integrates cameras (cable, seafloor and corer views), CTD (SBE37IDO), altimeter, 120KHz scientific echo-sounders, Niskin bottles and hydrocarbon sensor suite. Sensor data is delivered in real time to the surface via fibre optic deployment cable. The Smith-MacIntyre grab is a comparatively simple tool collecting sediments. Sediment samples were analysed for grain-size composition, nutrients (total organic and inorganic carbon and nitrogen content) as well as macrofauna collected by elutriation (data from the macro-fauna analyses are described with the other benthic biota collections (GABDMP - Benthic Biota).

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    This dataset contains seagrass distribution and density data from Marmion Lagoon, Perth, Western Australia. Every 6 months from 1979 until January 1998, two transects a north south and an east west (370 m and 330 m long) in 4 m of water were conducted. Any species or density changes along the transects were recorded.

  • Presentation Abstract: Submerged sand banks in the northwest of Torres Strait typically have smaller dunes superimposed upon them. Survey work undertaken as part of the Torres Strait CRC measured the rates of sand dune migration on these banks in an effort to gauge their potential impact on local seagrass communities. Marine surveys at the end of the monsoon and trade wind seasons measured very similar hydrodynamic conditions but substantially different patterns of dune migration. At the end of the monsoon season migration rates of up to 17 meters were measured over a 14 day period, at the end of the trade wind season migration rates of up to 4 meters were measured over a similar time period. Wind data acquired for the two weeks before and during the monsoon season survey indicated the onset of the trade wind season during this time. As a result, the elevated levels of dune migration observed at the end monsoon season are probably the result of wind driven-currents, changing from predominantly eastwards during the monsoon season to predominantly westwards with the onset of the trade wind season. Dunes that were influenced by wind-driven currents during the monsoon season were east facing at the start of the trade wind season but these dunes then became hydrodynamically unstable under the influence of the westward-directed wind-driven currents and experienced accelerated levels of migration to the west. By comparison, the lower rates of sand dune migration observed during the trade wind season survey are considered to be representative of dunes that are hydrodynamically stable. The main conclusions from this research are that the dunes in the study area have been observed to move rapidly in response to seasonal changes in hydrodynamics however the typical rates of dune migration suggest that only seagrass communities in close proximity to the sandbanks are likely to be threatened by dune migration.

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    This project now supports in part Australia's first permanent acoustic listening station array on Ningaloo Reef - the Ningaloo Reef Ecosystem Tracking Array (NRETA) which has been established to answer major questions about the trophic structure, function and management of this environment, especially in terms of movement and migration patterns of key organisms within this ecosystem. NRETA has connected Australian acoustic telemetry science with the Census of Marine Life's (CoML) Pacific Ocean Shelf Tracking (POST) project in North America and the $35 million worldwide acoustic tracking initiative proposed by R O'Dor - Ocean Shelf Tracking and Physics Array (OSTAPA). NRETA will be a key factor in the development of shelf tracking arrays within Australia as part of AATAMS and will place Australia in a good position to take a leading role as this technology continues to expand worldwide. This project will add important data management and analysis tools to this array, essentially ensuring that the ability to process and understand data and keep pace with our ability to collect it.

  • CMAR has conducted a number of stock assessment surveys for finfish, beche-de-mer and trochus on the reefs of Torres Strait. During the course of the suveys, habitat data was also collected albeit at a coarser level of taxonomic resolution. The primary objective of this study was to characterise the reefs of Torres Strait in terms of the biological and habitat data collected during these surveys and to relate the nature of the reefs to the available physical data. Information collated for this study included comprehensive datasets on reef fish, beche-de-mer and seagrass; most of which was identified to species level. Information on corals and algae was based on visual estimates of percentage cover morphotypes. Little data on the other reef biota was collected. SOURCE_DATASET CRUISE_ID CRUISE_NAME CRUISE_YEAR RRI1 HE01 Reef Resource Inventory HE01 1995 RRI2 HE02 Reef Resource Inventory HE02 1995 WR95 WRS Warrior survey 1995 1995 RRI3 JK01 Reef Resource Inventory JK01 1996 RRI4 JK02 Reef Resource Inventory JK02 1996 WR96 WRS Warrior survey 1996 1996 WR98 WRS Warrior survey 1998 1998 WR00 WRS Warrior survey 2000 2000 ETS2 ETS2 East Torres Strait 2002 2002 WE02 WRS Warrior survey 2002 2002 WR04 WRS Warrior survey 2004 2004 ETS5 ETS5 East Torres Strait 2005 2005