Data

Condition of rocky reef communities around Tasmania: fish surveys

Australian Ocean Data Network
Barrett, Neville, Dr ; Edgar, Graham, Assoc/Prof
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doidoi:10.4226/77/57216dec5940d&rft.title=Condition of rocky reef communities around Tasmania: fish surveys&rft.identifier=doi:10.4226/77/57216dec5940d&rft.publisher=Institute for Marine and Antarctic Studies, University of Tasmania&rft.description=The data is the quantitative abundance of fish derived from underwater visual census methods involving transect counts at rocky reef sites around Tasmania. This data forms part of a larger dataset that also surveyed megafaunal invertebrate abundance and algal cover for the area. The aggregated dataset allows examination of changes in Tasmanian shallow reef floral and faunal communities over a decadal scale - initial surveys were conducted in 1992-1995, and again at the same sites in 2006-2007. There are plans for ongoing surveys. An additional component was added in the latter study - a boat ramp study looking at the proximity of boat ramps and their effects of fishing. We analysed underwater visual census data on fishes and macroinvertebrates (abalone and rock lobsters) at 133 shallow rocky reef sites around Tasmania that ranged from 0.6 - 131 km from the nearest boat ramp. These sites were not all the same as those used for the comparison of 1994 and 2006 reef communities. The subset of 133 sites examined in this component consisted of only those sites that were characterized by the two major algal (kelp) types (laminarian or fucoid dominated). Sites with atypical algal assemblages were omitted from the 196 sites surveyed in 2006. This study aimed to examine reef community data for changes at the community level, changes in species richness and introduced species populations, and changes that may have resulted from ocean warming and fishing. The methods are described in detail in Edgar and Barrett (1997). Primarily the data are derived from transects at 5 m depth and/or 10 m depth at each site surveyed. The underwater visual census (UVC) methodology used to survey rocky reef communities was designed to maximise detection of (i) changes in population numbers and size-structure (ii) cascading ecosystem effects associated with disturbances such as fishing, (iii) long term change and variability in reef assemblages.The underwater visual census (UVC) methodology used to survey rocky reef communities involved quantitative diver-based surveys of fishes, large mobile invertebrates and macroalgae (see below for more detail; also described by Edgar & Barrett, 1997 and Edgar et al., 1997). A total of 136 sites from 8 bioregions around Tasmania were surveyed in both 1992-1995 and 2006-2007. An additional 60 sites were either resurveyed (from sites first surveyed in 1999) or surveyed for the first time in 2006. At each site, 4 x 50m transects were laid at the 5m or 10m depth contour, and fishes, invertebrates (> 2.5 cm) and algae were recorded separately by a team of 2 - 3 divers. Details of each site, including the date and GPS location, were recorded and are available at IMAS. The methods below describe the specific survey technique for measuring fish abundance: FISHES:-The density and estimated size-class of fish species within 5 m either side of the 50 m transect line were recorded by a diver (i.e. 50 m x 10 m). This was done by swimming parallel to the transect line (2.5 m away) and recording fish within a 5 m wide lane, on each side of the transect. Size-classes of total fish length were categorised as 25, 50, 75, 100, 125, 150, 200, 250, 300, 350, 375, 400, 500, 625, 750, 875 and 1000+ mm. Lengths of fish >1000 mm length were individually estimated. For the boat ramp component, the UVC methods described above were used to record abundance and size structure of fishes and mobile benthic macroinvertebrates at 133 shallow reef sites around the Tasmanian coastline.&rft.creator=Barrett, Neville, Dr &rft.creator=Edgar, Graham, Assoc/Prof &rft.date=2015&rft.relation=http://dx.doi.org/10.1016/S0022-0981(96)02769-4&rft.relation=http://dx.doi.org/10.1016/S0006-3207(96)00095-X&rft.relation=http://dx.doi.org/10.1016/j.jembe.2008.08.002&rft.relation=http://dx.doi.org/10.1111/j.1365-2486.2009.01955.x&rft.coverage=northlimit=-39.5; southlimit=-44; westlimit=144.5; eastLimit=148.5&rft_rights=Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/&rft_rights=Please contact the researchers when accessing the data, and please consult researchers before usage of the data, in reference to authorship.&rft_rights=The data described in this record are the intellectual property of the University of Tasmania through the Institute for Marine and Antarctic Studies.&rft_subject=biota&rft_subject=EARTH SCIENCE | BIOSPHERE | ECOSYSTEMS | MARINE ECOSYSTEMS | BENTHIC&rft_subject=EARTH SCIENCE | BIOSPHERE | ECOSYSTEMS | MARINE ECOSYSTEMS | REEF&rft_subject=COMMUNITY STRUCTURE&rft_subject=EARTH SCIENCE&rft_subject=BIOSPHERE&rft_subject=ECOLOGICAL DYNAMICS&rft_subject=COMMUNITY DYNAMICS&rft_subject=FISH&rft_subject=BIOLOGICAL CLASSIFICATION&rft_subject=ANIMALS/VERTEBRATES&rft_subject=Temperate Reef&rft_subject=TASMANIA&rft_subject=Marine and Estuarine Ecology (incl. Marine Ichthyology)&rft_subject=BIOLOGICAL SCIENCES&rft_subject=ECOLOGY&rft_subject=Community Ecology&rft_subject=Natural Resource Management&rft_subject=ENVIRONMENTAL SCIENCES&rft_subject=ENVIRONMENTAL SCIENCE AND MANAGEMENT&rft.type=dataset&rft.language=English Access the data

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Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/

Please contact the researchers when accessing the data, and please consult researchers before usage of the data, in reference to authorship.

The data described in this record are the intellectual property of the University of Tasmania through the Institute for Marine and Antarctic Studies.

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Full description

The data is the quantitative abundance of fish derived from underwater visual census methods involving transect counts at rocky reef sites around Tasmania. This data forms part of a larger dataset that also surveyed megafaunal invertebrate abundance and algal cover for the area. The aggregated dataset allows examination of changes in Tasmanian shallow reef floral and faunal communities over a decadal scale - initial surveys were conducted in 1992-1995, and again at the same sites in 2006-2007. There are plans for ongoing surveys. An additional component was added in the latter study - a boat ramp study looking at the proximity of boat ramps and their effects of fishing. We analysed underwater visual census data on fishes and macroinvertebrates (abalone and rock lobsters) at 133 shallow rocky reef sites around Tasmania that ranged from 0.6 - 131 km from the nearest boat ramp. These sites were not all the same as those used for the comparison of 1994 and 2006 reef communities. The subset of 133 sites examined in this component consisted of only those sites that were characterized by the two major algal (kelp) types (laminarian or fucoid dominated). Sites with atypical algal assemblages were omitted from the 196 sites surveyed in 2006. This study aimed to examine reef community data for changes at the community level, changes in species richness and introduced species populations, and changes that may have resulted from ocean warming and fishing. The methods are described in detail in Edgar and Barrett (1997). Primarily the data are derived from transects at 5 m depth and/or 10 m depth at each site surveyed. The underwater visual census (UVC) methodology used to survey rocky reef communities was designed to maximise detection of (i) changes in population numbers and size-structure (ii) cascading ecosystem effects associated with disturbances such as fishing, (iii) long term change and variability in reef assemblages.

Lineage

The underwater visual census (UVC) methodology used to survey rocky reef communities involved quantitative diver-based surveys of fishes, large mobile invertebrates and macroalgae (see below for more detail; also described by Edgar & Barrett, 1997 and Edgar et al., 1997).

A total of 136 sites from 8 bioregions around Tasmania were surveyed in both 1992-1995 and 2006-2007. An additional 60 sites were either resurveyed (from sites first surveyed in 1999) or surveyed for the first time in 2006.

At each site, 4 x 50m transects were laid at the 5m or 10m depth contour, and fishes, invertebrates (> 2.5 cm) and algae were recorded separately by a team of 2 - 3 divers. Details of each site, including the date and GPS location, were recorded and are available at IMAS. The methods below describe the specific survey technique for measuring fish abundance:

FISHES:-The density and estimated size-class of fish species within 5 m either side of the 50 m transect line were recorded by a diver (i.e. 50 m x 10 m). This was done by swimming parallel to the transect line (2.5 m away) and recording fish within a 5 m wide lane, on each side of the transect. Size-classes of total fish length were categorised as 25, 50, 75, 100, 125, 150, 200, 250, 300, 350, 375, 400, 500, 625, 750, 875 and 1000+ mm. Lengths of fish >1000 mm length were individually estimated.

For the boat ramp component, the UVC methods described above were used to record abundance and size structure of fishes and mobile benthic macroinvertebrates at 133 shallow reef sites around the Tasmanian coastline.

Created: 2015-06-07

Data time period: 1992-01-01 to 1995-01-31

Data time period: 2006-03-01 to 2007-06-26

Click to explore relationships graph

148.5,-39.5 148.5,-44 144.5,-44 144.5,-39.5 148.5,-39.5

146.5,-41.75

Other Information
DATA ACCESS - all fish surveys [direct download]

uri : https://geoserver.imas.utas.edu.au/geoserver/wfs

URI : https://geoserver.imas.utas.edu.au/geoserver/wfs?version=1.0.0&request=GetFeature&typeName=imas:MB_EXTRACT_SAMPLE_FISH_ALL_DATA&outputFormat=csv

MAP - Condition of rocky reef communities around Tasmania: fish surveys (imas:MB_EXTRACT_SAMPLE_FISH_ALL_MAP)

uri : https://geoserver.imas.utas.edu.au/geoserver/wms

This OCG WFS service returns the data (fish surveys) for download in multiple formats, including CSV (imas:MB_EXTRACT_SAMPLE_FISH_ALL_DATA)

uri : https://geoserver.imas.utas.edu.au/geoserver/wfs

View and download this data through the interactive IMAS Data Portal.

uri : https://data.imas.utas.edu.au/portal/home

URI : https://data.imas.utas.edu.au/portal/home?uuid=caf7220a-19e0-4a7f-9af6-eade6c79a47a