Data

Condition of rocky reef communities around Tasmania: invertebrate surveys

University of Tasmania, Australia
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=https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/9aee213b-ab23-4321-9994-f7db2f6b2e78&rft.title=Condition of rocky reef communities around Tasmania: invertebrate surveys&rft.identifier=https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/9aee213b-ab23-4321-9994-f7db2f6b2e78&rft.description=The data is the quantitative abundance of megafaunal invertebrates 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 fish 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.Maintenance and Update Frequency: irregularStatement: 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 macroinvertebrate abundance: MACROINVERTEBRATES:-A diver searched the seabed for a 1 m wide lane along the transect line for cryptic fishes and macroinvertebrates (i.e. 50 m x 1 m). Four 1 m x 50 m transects were surveyed at each site. Algae were swept away from the transect to obtain a clear view of the substratum. Mobile invertebrates (including rock lobsters, abalone, sea urchins, octopus etc) were counted, as were cryptic fishes (also estimated for size). The maximum shell length of abalone and the carapace length of rock lobsters were measured underwater using vernier callipers whenever possible. 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.coverage=westlimit=144.50; southlimit=-44.00; eastlimit=148.50; northlimit=-39.50&rft.coverage=westlimit=144.50; southlimit=-44.00; eastlimit=148.50; northlimit=-39.50&rft.coverage=uplimit=10; downlimit=5&rft.coverage=uplimit=10; downlimit=5&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_rights= http://creativecommons.org/licenses/by/2.5/au/&rft_rights=http://i.creativecommons.org/l/by/2.5/au/88x31.png&rft_rights=WWW:LINK-1.0-http--related&rft_rights=License Graphic&rft_rights=Creative Commons Attribution 2.5 Australia License&rft_rights=http://creativecommons.org/international/au/&rft_rights=WWW:LINK-1.0-http--related&rft_rights=WWW:LINK-1.0-http--related&rft_rights=License Text&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=Creative Commons Attribution 2.5 Australia License http://creativecommons.org/licenses/by/2.5/au&rft_subject=biota&rft_subject=BENTHIC HABITAT&rft_subject=EARTH SCIENCE&rft_subject=BIOSPHERE&rft_subject=AQUATIC ECOSYSTEMS&rft_subject=REEF HABITAT&rft_subject=COMMUNITY STRUCTURE&rft_subject=ECOLOGICAL DYNAMICS&rft_subject=COMMUNITY DYNAMICS&rft_subject=ANIMALS/INVERTEBRATES&rft_subject=BIOLOGICAL CLASSIFICATION&rft_subject=Temperate Reef&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_subject=diver&rft_subject=Abundance of biota&rft_subject=Biotic taxonomic identification&rft_subject=Shell length - abalone&rft_subject=Carapace length - rock lobster&rft_subject=Percentage cover algal species&rft.type=dataset&rft.language=English Access the data

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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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Brief description

The data is the quantitative abundance of megafaunal invertebrates 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 fish 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

Maintenance and Update Frequency: irregular
Statement: 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 macroinvertebrate abundance: MACROINVERTEBRATES:-A diver searched the seabed for a 1 m wide lane along the transect line for cryptic fishes and macroinvertebrates (i.e. 50 m x 1 m). Four 1 m x 50 m transects were surveyed at each site. Algae were swept away from the transect to obtain a clear view of the substratum. Mobile invertebrates (including rock lobsters, abalone, sea urchins, octopus etc) were counted, as were cryptic fishes (also estimated for size). The maximum shell length of abalone and the carapace length of rock lobsters were measured underwater using vernier callipers whenever possible. 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.

Notes

Credit
Natural Resource Management (NRM)
Credit
National Heritage Trust (NHT)
Credit
Stuart-Smith, Rick, Dr
Credit
Frusher, Stewart, Assoc/Prof
Credit
Schaap, Alex
Purpose
Description of biogeographical patterns on an Australia wide scale, for understanding natural variability over time, detecting changes associated with climate change (range extensions), quantifying impacts of introduced species (e.g. Undaria); understanding and describing ecosystem effects of fishing, and describing the influence of reef based fisheries at the decade scale. The initial survey provided a detailed census of marine life for each site, and by re-examining these sites the aim is to enhance our understanding of how reef species vary over a 12-13 year time scale. These data will allow better management of rocky reef resources from increased knowledge of changes in these systems through natural and human induced events, such as introduced species outbreaks, increased fishing pressure, climate change and disturbance of marine health.

Created: 07 06 2015

Data time period: 1992 to 31 01 1995

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

This dataset is part of a larger collection

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

146.5,-41.75

text: westlimit=144.50; southlimit=-44.00; eastlimit=148.50; northlimit=-39.50

text: uplimit=10; downlimit=5

Other Information
(ASSOCIATED PUBLICATION - Short term monitoring of biotic change in Tasmanian marine reserves (DOI: 10.1016/S0022-0981(96)02769-4))

doi : http://dx.doi.org/10.1016/S0022-0981(96)02769-4

(ASSOCIATED PUBLICATION - The conservation-related benefits of a systematic marine biological sampling programme: The Tasmanian reef bioregionalisation as a case study (DOI: S0006-3207(96)00095-X))

doi : http://dx.doi.org/10.1016/S0006-3207(96)00095-X

(ASSOCIATED PUBLICATION - Spatial patterns in impacts of fishing on temperate rocky reefs: Are fish abundance and mean size related to proximity to fisher access points? (DOI: 10.1016/j.jembe.2008.08.002))

doi : http://dx.doi.org/10.1016/j.jembe.2008.08.002

(ASSOCIATED PUBLICATION - Stability in temperate reef communities over a decadal time scale despite concurrent ocean warming (DOI: 10.1111/j.1365-2486.2009.01955.x))

doi : http://dx.doi.org/10.1111/j.1365-2486.2009.01955.x

global : 29c481ab-e1b7-4eab-92df-3cfb20240255

Identifiers
  • global : 9aee213b-ab23-4321-9994-f7db2f6b2e78