IMAS Metadata Catalogue
Southern right whale
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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 17th August 2021, to maintain the annual series of surveys and inform the long-term population trend. The maximum whale counts for each leg of the survey flights between Cape Leeuwin and Ceduna, and consisted of a total 643 southern right whales sighted across the survey area (270 cow-calf pairs and 103 unaccompanied whales). The subsequent population estimate for the Australian ‘south-western’ population is 2,549 whales, which represents the majority of the Australian population given the very low numbers in the ‘south-eastern’ subpopulation. The population long-term trend data is indicating recent years (from 2007) are showing greater inter-annual variation in whale counts. To evaluate the recovery of the southern right whale population, it will be critical to collect long-term data on the annual variability in whale numbers related to the non-annual female breeding cycle and identify possible impacts on this by short-term climate dynamics, longer-term climate change and/or anthropogenic threats.
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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.
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This record provides an overview of the scope and research output of the NESP Marine Biodiversity Hub project "Estimation of population abundance and mixing of southern right whales in the Australian and New Zealand regions". For specific data outputs from this project, please see child records associated with this metadata. -------------------- A comprehensive understanding of the population abundance and degree of spatial connectivity of southern right whales (Eubalaena australis) in Australian waters is currently lacking. This limits assessments of the species recovery and understanding of the nature and degree of difference between the south-eastern and south-western Australian populations. This project brought together existing photo-identification datasets, including records held in the Australian Right Whale Photo-Identification Catalogue (ARWPIC), to support a national assessment of southern right whale population dynamics and connectivity. It estimated total Australian population abundance, investigated links between whales using breeding areas along the eastern, southern and western coasts of Australia, and assessed future data collection needs for ongoing monitoring. The project supported evaluation of progress against the Conservation Management Plan for southern right whales and contributed to more coordinated conservation planning for the species at regional and national scales.
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This record provides an overview of the NESP Marine and Coastal Hub Research Plan 2023 project "Monitoring, aggregation areas and approaches to improve data effectiveness for southern right whale conservation". For specific data outputs from this project, please see child records associated with this metadata. -------------------- Southern right whales are listed as Endangered under the EPBC Act and are recovering slowly from historical whaling. In Australia, recovery differs between the growing western population and the more poorly understood eastern population, where available data are largely opportunistic. Improved abundance estimates, photo-identification workflows, aggregation-area assessment, and understanding of connectivity are needed to support conservation management. This project delivered priority information for southern right whale conservation through four linked components: (1) long-term aerial surveys of the western population; (2) expansion and integration of photo-identification datasets within the Australian Right Whale Photo-Identification Catalogue (ARWPIC); (3) development of statistical approaches to combine opportunistic and systematic observations; and (4) collection of movement and genomic data to assess connectivity between eastern and western subpopulations. The project continued annual aerial surveys from Perth to Ceduna to update abundance trends and reproductive parameters for the western population. Photo-identification images and metadata were collated from archived, targeted, and opportunistic sources across eastern and western aggregation areas, supporting matching of individual whales, assessment of reproductive areas, and estimation of population parameters. The project also developed methods to expand the use of opportunistic sightings data alongside systematically collected observations, improving capacity to estimate population size, trends, recovery rates, residency, site fidelity, and connectivity. Movement, photo-identification, and genomic data collected near the boundary of the eastern and western subpopulations, particularly around Encounter Bay and adjacent waters, supported assessment of population structure, whale movements, habitat use, and potential exposure to human activities. The outputs of this project support updates to the national Southern Right Whale Conservation Management Plan, Biologically Important Area (BIA) mapping, marine park management, and risk assessments for marine industries and tourism. Consultation and engagement with Indigenous groups in South Australia and Western Australia enabled communication of research goals and findings, supported knowledge sharing, and identified opportunities for collaboration and capacity building linked to southern right whale conservation. Outputs • Individual whale photo-identifications in aggregation areas [ARWPIC image catalogue] • Aerial survey data for 2023, 2024, 2026 [dataset] • Exposure to single and cumulative threats [dataset] • Whale tracking tracking, behaviour, and dive data [dataset] • Final project report [written]
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This project developed an interim Population Consequence of Disturbance (iPCoD) model for blue whales (Balaenoptera musculus) and southern right whales (Eubalaena australis) to document a methodology for assessing population-level impacts of one, or multiple, wind farm developments off the southern Australian coast. The iPCoD model was developed in Europe to quantify how disturbances of individuals caused by physiological injury or changes in behaviour can have population-level consequences in data poor marine mammal populations. This model was adapted to suit Australian marine mammal species, highlighting key data gaps for locally threatened populations that overlap in range with the declared offshore wind areas in Australia. Due to the lack of baseline data currently available, this study documented a framework that can be updated as more information becomes available. We outlined how to leverage simulation-based population modelling as a tool for policymakers, industry and management authorities, to aid in environmental impact assessments, with a specific focus on data poor marine mammal populations.