Data

2022 Aerial survey data of southern right whales (Eubalaena australis) off southern Australia (NESP MaC 2.7)

University of Tasmania, Australia

Smith, Joshua ; Double, Michael

Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]

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The ‘western’ population of southern right whales in Australian waters is increasing in size (~5.3% per year based on female/calf pairs and a population estimate of 2675 whales) based on the long-term population trend data from the annual aerial surveys. This represents the majority of the Australian population given the very low numbers in the ‘eastern’ population. The 2022 surveys recorded the lowest number of unaccompanied animals (i.e. males and females without a calf) ever throughout the time-series of the annual aerial surveys since 1993 when survey coverage between Cape Leeuwin and Ceduna first began. Across this time series, there is a particularly notable decline in sightings of unaccompanied animals over the past five years. It is currently unclear what factors account for the decline in these sightings or may influence the variation in numbers of unaccompanied animals on the southern Australian coast. Lower than expected counts in the long-term data may provide evidence of a slowing population growth rate, which can only be assessed by continued annual population surveys to assess population trend data.Maintenance and Update Frequency: none-plannedStatement: Photo quality will be variable and requires assessment prior to assimilation into photo-identification catalogue.&rft.creator=Smith, Joshua &rft.creator=Double, Michael &rft.date=2023&rft.coverage=-31.969671999663042,115.83638800240442 -32.47875400019689,115.74526400003367 -32.68149400024788,115.60595999985412 -33.28812859995486,115.71151389964677 -33.63946580030637,115.36693740044075 -33.62349800013255,115.12199600021529 -33.63380000036966,115.02791600002344 -33.98682409955251,114.99030960040784 -34.30611200006871,115.16246400031343 -34.33392000000795,115.401211999834 -34.43045852454122,115.70035499118991 -34.83544459988832,116.12485720029963 -34.87731369966747,116.25545989995452 -34.939738199658166,116.37696490040992 -35.016237999783804,116.48214799983042 -35.00474799962046,116.53456980025611 -34.975111999918795,116.72545600009438 -34.97406162144666,117.15156893815607 -34.9657259996551,117.46448399983684 -35.01112481795593,117.69794926384746 -34.85991594506474,118.31393219121776 -34.63687575711044,118.52273997377085 -34.41610516841877,118.91599461785732 -34.40358569902077,119.20312374496494 -34.31518329966951,119.49961070017379 -34.14213599977654,119.58970200024714 -33.98384559979456,119.81651880030243 -33.92311549988038,120.04127240000128 -33.920847386297794,120.4228907035432 -33.77633295250371,121.19547945051625 -33.822604186034326,121.58177381770759 -33.88947399982521,121.82784200010826 -33.82815599959963,121.93467600029727 -33.81682166578718,122.0655118132197 -33.9972407057939,122.16376749427445 -33.91242079987996,122.36816380001937 -33.85612349969972,123.01993159966366 -33.90384599979302,123.13352170006645 -33.89549820028167,123.37146599975621 -33.81103878041535,123.63505019940726 -33.69529822023662,123.71509318090568 -33.557350000202305,123.97735000010243 -33.187101290192345,124.04570549391349 -32.9508733790032,124.27539404330048 -32.83983213354611,124.76261216781732 -32.27666014145233,125.900614504356 -32.2139435785333,126.22985701858657 -32.19768535489516,127.21060760915395 -31.80360878621645,128.65954242044643 -31.670947738047637,129.15125701849672 -31.540651703613207,130.40605009583533 -31.464052999646192,131.14290280012415 -31.570123853133282,131.56891010022105 -31.99210191976772,132.24952187203678 -31.906818934945882,132.54111905949708 -31.972822153919182,132.7833269739607 -32.157474522231375,133.16253097462481 -32.18275269598007,133.33268847309466 -32.12235813042332,133.471683577735 -32.085680000231775,133.61211400036086 -32.23479599963565,133.8223499998527 -32.390243999660804,133.95167000007052 -32.449121276725506,133.9124049673154 -32.48272809982189,134.18410730031178 -32.76867771660329,134.3634997147401 -34.27828249733933,133.22687474207578 -33.69680507119705,131.42973189631005 -33.41234080348523,130.80063625725757 -33.46469869898572,129.49896922165237 -34.03556830863051,127.68914146720499 -34.061897594698166,126.68528165272618 -34.451719737875585,125.85636061385128 -35.21501283137701,125.07601262508261 -35.59430267233039,124.40313053794398 -35.818637721253765,123.23227880082608 -35.705238039703715,121.0705866940208 -36.71385065158625,119.02885155855267 -36.90855617592673,118.29772736572545 -36.791022003362734,116.00978138929975 -36.44826551973791,114.99806459560466 -35.86640206680192,113.8996084091009 -35.17274449106538,113.14550978994487 -34.275506345941096,112.83138050770435 -33.04339969963638,112.93594424852836 -31.871073156201135,113.70455767369778 -31.969671999663042,115.83638800240442&rft_rights=Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/&rft_rights=Cite data as: Smith, J., & Double, M. (2023). 2022 Aerial survey data of southern right whales (Eubalaena australis) off southern Australia [Data set]. Institute for Marine and Antarctic Studies. https://doi.org/10.25959/27GD-VY37&rft_rights=This dataset is hosted by the University of Tasmania, on behalf of the Australian Antarctic Data Centre and NESP Marine and Coastal Hub Project 2.7.&rft_rights=Data was sourced from the NESP Marine and Coastal Hub – the Marine and Coastal Hub is supported through funding from the Australian Government’s National Environmental Science Program (NESP), administered by the Department of Climate Change, Energy, the Environment and Water.&rft_subject=biota&rft_subject=National Environmental Science Program (NESP) Marine and Coastal Hub&rft_subject=Southern right whale&rft_subject=Areal survey&rft_subject=Eubalaena australis&rft_subject=BALEEN WHALES&rft_subject=EARTH SCIENCE&rft_subject=BIOLOGICAL CLASSIFICATION&rft_subject=ANIMALS/VERTEBRATES&rft_subject=MAMMALS&rft_subject=CETACEANS&rft_subject=Global / Oceans | Global / Oceans | Southern Ocean&rft.type=dataset&rft.language=English Access the data

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Creative Commons Attribution 4.0 International License
http://creativecommons.org/licenses/by/4.0/

Cite data as: Smith, J., & Double, M. (2023). 2022 Aerial survey data of southern right whales (Eubalaena australis) off southern Australia [Data set]. Institute for Marine and Antarctic Studies. https://doi.org/10.25959/27GD-VY37

This dataset is hosted by the University of Tasmania, on behalf of the Australian Antarctic Data Centre and NESP Marine and Coastal Hub Project 2.7.

Data was sourced from the NESP Marine and Coastal Hub – the Marine and Coastal Hub is supported through funding from the Australian Government’s National Environmental Science Program (NESP), administered by the Department of Climate Change, Energy, the Environment and Water.

Access:

Open

Full description

Aerial surveys of southern right whales (Eubalaena australis) were undertaken off the southern Australian coast to monitor the recovery of this endangered species following extreme 19th and 20th Century commercial whaling. The aerial survey was undertaken in the coastal waters from Perth (Western Australia) to Ceduna (South Australia) between the 12th and 19th August 2022, to maintain the annual series of surveys and inform the long-term population trend. The survey resulted in a total 526 whales sighted, consisting of 247 cow-calf pairs, 31 unaccompanied adults and 1 yearling. The ‘western’ population of southern right whales in Australian waters is increasing in size (~5.3% per year based on female/calf pairs and a population estimate of 2675 whales) based on the long-term population trend data from the annual aerial surveys. This represents the majority of the Australian population given the very low numbers in the ‘eastern’ population. The 2022 surveys recorded the lowest number of unaccompanied animals (i.e. males and females without a calf) ever throughout the time-series of the annual aerial surveys since 1993 when survey coverage between Cape Leeuwin and Ceduna first began. Across this time series, there is a particularly notable decline in sightings of unaccompanied animals over the past five years. It is currently unclear what factors account for the decline in these sightings or may influence the variation in numbers of unaccompanied animals on the southern Australian coast. Lower than expected counts in the long-term data may provide evidence of a slowing population growth rate, which can only be assessed by continued annual population surveys to assess population trend data.

Lineage

Maintenance and Update Frequency: none-planned

Statement: Photo quality will be variable and requires assessment prior to assimilation into photo-identification catalogue.

Notes

Credit
The data collections described in this record are funded by the Australian Government Department of Climate Change, Energy, the Environment and Water (DCCEEW) through the NESP Marine and Coastal Hub. In addition to NESP (DCCEEW) funding, this project is matched by an equivalent amount of in-kind support and co-investment from project partners and collaborators.

Purpose
Assessing the status and trend of Australia's southern right whale populations

Data time period: 2022-08-12 to 2022-08-19

This dataset is part of a larger collection

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Subjects

User Contributed Tags

Other Information

(2022 field survey data [direct download])

url : https://data.imas.utas.edu.au/attachments/0e431de4-43c6-4101-8930-c7705f1522fc/2022_NESP_MAC_1.26_SRW_aerial_survey_field_data.xlsx External Link

global : 72e60dd3-f407-4be4-acb6-c611291fc912

local : 00r4sry34

local : 0000-0001-9912-422X

local : 05e89k615

local : 0000-0002-7820-9491

local : 00r4sry34

local : 0000-0001-9912-422X

NESP MaC Project 2.7 - Aerial survey of the Southern Right Whale 'western' sub-population off southern Australia, 2022-2023 (Murdoch Uni)

doi : 10.71676/6c66595b DOI Link

Identifiers

DOI : 10.25959/27GD-VY37
global : 0e431de4-43c6-4101-8930-c7705f1522fc