Data

Locations and health of beachcast fragments of Posidonia in Botany Bay (NESP MaC 1.8)

Australian Ocean Data Network
Liddell, Bryce
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=http://catalogue-aodn.prod.aodn.org.au/geonetwork/srv/eng/search?uuid=15dca9a6-766a-46d9-8b1b-f9466e724c7a&rft.title=Locations and health of beachcast fragments of Posidonia in Botany Bay (NESP MaC 1.8)&rft.identifier=http://catalogue-aodn.prod.aodn.org.au/geonetwork/srv/eng/search?uuid=15dca9a6-766a-46d9-8b1b-f9466e724c7a&rft.description=Efforts to restore Posidonia seagrass meadows in NSW are reliant on collecting beachcast fragments as collection of donor material from extant beds is prohibited. However, to maximise the collection efforts it necessary to understand where to collect fragments from and what environmental conditions (e.g. wind direction, wind strength, tidal height) increase the availability of fragments and where to collect the most healthy fragments. This data set captures the abundance of fragments at 7 sites in Gamay (Botany Bay), an area of interest for restoration of Posidonia australis. It investigates how characteristics of wind (speed and direction), tidal height and swell (height, direction) influence the availability (abundance) and health (as determined by observations of necrosis) of shoots at sites throughout Botany Bay. The Excel data workbook is comprised of two sheets: Fragments_data sheet shows the number of P. australis fragments collected at different sites, when they were collected, and the environmental conditions at collection (see data attributes section). Shoot_data sheet shows the proportion of necrosis of shoots attached to collected fragments.Beach surveys were conducted to record number of Posidonia australis fragments. Surveys (n=39) were completed between 29/09/2021 and 7/11/2021. Dates and sites surveyed each day was dependent upon vessel availability and weather conditions as some sites are only accessible via vessel. The study surveyed 7 beaches in Gamay (Botany Bay). The beaches included Yarra Bay Beach, Frenchman’s Bay Beach, Congwong Beach, Brighton Le Sands Beach, Dolls Point Beach, Silver Beach, and Towra beach. As some of the beaches are large, it was not always feasible to walk the entire stretch of beach (these were termed ‘partial’ surveys). Sections of large beaches were identified as suitable to survey, taking beach access into consideration. Brighton Le Sands survey area was between (-33.969910 LAT , 151.153128 LNG) and (-33.979260 LAT , 151.149984 LNG). Silver Beach survey area was between (-34.005092 LAT , 151.217101 LNG) and (-34.008107 LAT , 151.204953 LNG). The entire beach was surveyed for all other sites. For each survey the surveyor recorded time, beach name, start and finish coordinates, as well as number of fragments found. Each fragment’s location was also recorded along with the number of shoots (leaves on each fragment) and necrosis percentage (visualised at areas of dead white tissue). Tide, wind (at time of survey and 3pm the day prior), and swell were recorded post survey. Wind speed and direction data was collected from the Bureau of Meteorology website (http://www.bom.gov.au/). Swell height and direction data was collected from Manly Hydraulics Lab website (https://www.mhl.nsw.gov.au/). Tide data sourced from ‘Willy Weather’ mobile app. All coordinates were obtained from ‘Google Earth’ on either mobile app or desktop.&rft.creator=Liddell, Bryce &rft.date=2015&rft.coverage=northlimit=-33.96991000000001; southlimit=-33.97926; westlimit=151.14998399999996; eastLimit=151.153128&rft.coverage=northlimit=-33.96991000000001; southlimit=-33.97926; westlimit=151.14998399999996; eastLimit=151.153128&rft.coverage=northlimit=-34.005092000000005; southlimit=-34.00810700000001; westlimit=151.204953; eastLimit=151.21710099999999&rft.coverage=northlimit=-34.005092000000005; southlimit=-34.00810700000001; westlimit=151.204953; eastLimit=151.21710099999999&rft.coverage=northlimit=-33.983067482231945; southlimit=-33.98783580859765; westlimit=151.22986089545108; eastLimit=151.2317920859419&rft.coverage=northlimit=-33.983067482231945; southlimit=-33.98783580859765; westlimit=151.22986089545108; eastLimit=151.2317920859419&rft.coverage=northlimit=-33.976270281268995; southlimit=-33.98182188552108; westlimit=151.22471105414246; eastLimit=151.22960340338568&rft.coverage=northlimit=-33.976270281268995; southlimit=-33.98182188552108; westlimit=151.22471105414246; eastLimit=151.22960340338568&rft.coverage=northlimit=-33.99306410231266; southlimit=-33.998187660426595; westlimit=151.1407134485934; eastLimit=151.14921068675247&rft.coverage=northlimit=-33.99306410231266; southlimit=-33.998187660426595; westlimit=151.1407134485934; eastLimit=151.14921068675247&rft.coverage=northlimit=-33.98895893204609; southlimit=-33.989350344767615; westlimit=151.23426174647543; eastLimit=151.2358066988679&rft.coverage=northlimit=-33.98895893204609; southlimit=-33.989350344767615; westlimit=151.23426174647543; eastLimit=151.2358066988679&rft.coverage=northlimit=-33.99970318636705; southlimit=-34.00646284314869; westlimit=151.1554494352293; eastLimit=151.17304472636695&rft.coverage=northlimit=-33.99970318636705; southlimit=-34.00646284314869; westlimit=151.1554494352293; eastLimit=151.17304472636695&rft_rights=Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0&rft_subject=biota&rft_subject=Botany Bay&rft_subject=Gamay&rft_subject=restoration&rft_subject=seagrass&rft_subject=shoot collection&rft_subject=Posidonia australis&rft_subject=SEAGRASS&rft_subject=EARTH SCIENCE&rft_subject=BIOLOGICAL CLASSIFICATION&rft_subject=PLANTS&rft_subject=ANGIOSPERMS (FLOWERING PLANTS)&rft_subject=MONOCOTS&rft_subject=RECLAMATION/REVEGETATION/RESTORATION&rft_subject=BIOSPHERE&rft_subject=VEGETATION&rft.type=dataset&rft.language=English Access the data

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Creative Commons Attribution 4.0 International License
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Brief description

Efforts to restore Posidonia seagrass meadows in NSW are reliant on collecting beachcast fragments as collection of donor material from extant beds is prohibited. However, to maximise the collection efforts it necessary to understand where to collect fragments from and what environmental conditions (e.g. wind direction, wind strength, tidal height) increase the availability of fragments and where to collect the most healthy fragments. This data set captures the abundance of fragments at 7 sites in Gamay (Botany Bay), an area of interest for restoration of Posidonia australis. It investigates how characteristics of wind (speed and direction), tidal height and swell (height, direction) influence the availability (abundance) and health (as determined by observations of necrosis) of shoots at sites throughout Botany Bay.

The Excel data workbook is comprised of two sheets:
Fragments_data sheet shows the number of P. australis fragments collected at different sites, when they were collected, and the environmental conditions at collection (see data attributes section).
Shoot_data sheet shows the proportion of necrosis of shoots attached to collected fragments.

Lineage

Beach surveys were conducted to record number of Posidonia australis fragments. Surveys (n=39) were completed between 29/09/2021 and 7/11/2021. Dates and sites surveyed each day was dependent upon vessel availability and weather conditions as some sites are only accessible via vessel.

The study surveyed 7 beaches in Gamay (Botany Bay). The beaches included Yarra Bay Beach, Frenchman’s Bay Beach, Congwong Beach, Brighton Le Sands Beach, Dolls Point Beach, Silver Beach, and Towra beach. As some of the beaches are large, it was not always feasible to walk the entire stretch of beach (these were termed ‘partial’ surveys). Sections of large beaches were identified as suitable to survey, taking beach access into consideration. Brighton Le Sands survey area was between (-33.969910 LAT , 151.153128 LNG) and (-33.979260 LAT , 151.149984 LNG). Silver Beach survey area was between (-34.005092 LAT , 151.217101 LNG) and (-34.008107 LAT , 151.204953 LNG). The entire beach was surveyed for all other sites.

For each survey the surveyor recorded time, beach name, start and finish coordinates, as well as number of fragments found. Each fragment’s location was also recorded along with the number of shoots (leaves on each fragment) and necrosis percentage (visualised at areas of dead white tissue). Tide, wind (at time of survey and 3pm the day prior), and swell were recorded post survey. Wind speed and direction data was collected from the Bureau of Meteorology website (http://www.bom.gov.au/). Swell height and direction data was collected from Manly Hydraulics Lab website (https://www.mhl.nsw.gov.au/). Tide data sourced from ‘Willy Weather’ mobile app. All coordinates were obtained from ‘Google Earth’ on either mobile app or desktop.

Notes

Credit
Research was funded by 'Wild Elements Foundation Wild Innovator Award' to Prof. Adriana Vergés.
Credit
National Environmental Science Program (NESP) Marine and Coastal Hub

Data time period: 2021-09-29 to 2021-11-07

This dataset is part of a larger collection

151.15313,-33.96991 151.15313,-33.97926 151.14998,-33.97926 151.14998,-33.96991 151.15313,-33.96991

151.151556,-33.974585

151.2171,-34.00509 151.2171,-34.00811 151.20495,-34.00811 151.20495,-34.00509 151.2171,-34.00509

151.211027,-34.0065995

151.23179,-33.98307 151.23179,-33.98784 151.22986,-33.98784 151.22986,-33.98307 151.23179,-33.98307

151.23082649069,-33.985451645415

151.2296,-33.97627 151.2296,-33.98182 151.22471,-33.98182 151.22471,-33.97627 151.2296,-33.97627

151.22715722877,-33.979046083395

151.14921,-33.99306 151.14921,-33.99819 151.14071,-33.99819 151.14071,-33.99306 151.14921,-33.99306

151.14496206767,-33.99562588137

151.23581,-33.98896 151.23581,-33.98935 151.23426,-33.98935 151.23426,-33.98896 151.23581,-33.98896

151.23503422267,-33.989154638407

151.17304,-33.9997 151.17304,-34.00646 151.15545,-34.00646 151.15545,-33.9997 151.17304,-33.9997

151.1642470808,-34.003083014758

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  • global : 15dca9a6-766a-46d9-8b1b-f9466e724c7a