The Northern Giant Petrel spotted off the coast of Washington in 2019 and reported on by ACAP in January 2020, photograph by Zed Blue

The Northern Giant Petrel Macronectes halli is one of 16 birds the U.S. Fish and Wildlife Service (USFWS) is proposing to add to the list of birds protected by the Migratory Bird Treaty Act (MBTA).

The list reflects changes in taxonomy and accepted use, as well as new evidence regarding the natural occurrence or absence of species in the United States or U.S. territories. The inclusion of the Northern Giant Petrel is based on new distributional records documenting its occurrence in the United States or U.S. territories. 

In January of 2020, ACAP Latest News reported on the sighting of a Northern Giant Petrel from a fishing vessel off the coast of Washington, USA in the North Pacific on 8 December 2019. 

The proposal would add 16 species and remove three, bringing the total number of species protected by the MBTA to 1,106. Names changes would affect 30 other listings. 

Although the USA regularly attends and contributes to ACAP meetings, and despite repeated bipartisan efforts over the years to introduce enabling legislation to its House of Representatives, it is not yet a Party to the Agreement. ACAP and the National Audubon Society have previously reported on the efforts by the USA to become a Party to ACAP. 

The proposed Revised List of Migratory Birds made by the USFWS is available here, and comments can be submitted on the proposal through February 10, 2023.

21 December 2022

Common Diving Petrel in the hand on Marion Island, photograph by Stefan Schoombie

Maëlle Connan (Marine Apex Predator Research Unit, Institute for Coastal and Marine Research, Nelson Mandela University, Gqeberha, South Africa) and colleagues have published in Ostrich Journal of African Ornithology on the recent recolonisation of Marion Island by Common Diving Petrels Pelecanoides urinatrix, over two decades after the eradication of feral cats Felis catus in 1991.  The cats were introduced in 1948 and are thought to have caused the diving petrels’ extirpation soon afterwards.

Lead author Maëlle Connan writes to ACAP Latest News:  “further work is needed to understand the reasons for the low hatching success observed and whether predation by House Mice Mus musculus mice may be a contributing factor”.

At risk to mice?  Burrowscope photographs of a Common Diving Petrel adult alongside its egg (left) and a chick (right); by Stefan Schoombie

The paper’s abstract follows in English and French:

Nocturnal burrow-nesting seabirds are notoriously difficult to study and can go unnoticed for years in remote  areas. One of these species is the Common Diving Petrel Pelecanoides urinatrix, which has a circumpolar breeding distribution in the Southern Ocean, including at the sub-Antarctic Prince Edward Islands.  At Marion Island, the larger of the two islands, the species was extirpated by cats that were introduced in 1948.  The cats were eradicated by 1991, and Common Diving Petrels were discovered in burrows in coastal Poa cookii (Cook’s tussock grass) on a steep south-facing slope in Goodhope Bay during April 2015.  Subsequent surveys in October 2015 and February 2016 confirmed breeding over a 1-ha area.  In 2019/2020, breeding phenology and success was studied in 36 nests at the same site.  Birds called from their burrows from mid-September, laying started in early October, and the first chick was observed on 20 December.  Hatching peaked in early January and chicks fledged from the end of February to mid-March.  This breeding phenology is similar to that at the neighbouring Crozet Archipelago.  Overall nest survival was 46.4 ± 9.2% (mean ± SE; 95% CI: 29.5–64.1%), with most failures happening around hatching time.   Further monitoring is needed to assess whether introduced House Mice Mus musculus contributed to the low hatching success.  Common Diving Petrels were discovered breeding in other coastal areas, mostly in the south and east of the island. It is unlikely that breeding by this species was overlooked for three decades, suggesting that the elimination of cats allowed Common Diving Petrels to recolonise the island.”

Recolonisation naturelle de l’île subantarctique Marion par le Puffinure plongeur Pelecanoides urinatrix

Il est notoirement reconnu que les oiseaux de mer qui nichent la nuit dans des terriers sont difficiles à étudier et peuvent passer inaperçus pendant des années dans les régions éloignées. L’une de ces espèces est le Puffinure plongeur Pelecanoides urinatrix, qui a une distribution de reproduction circumpolaire dans l’océan austral, comprenant les îles subantarctiques du Prince-Edouard. Sur l’île de Marion, la plus grande des deux îles, cette espèce a été extirpée par des chats introduits en 1948. Les chats ont été complètement éradiqués en 1991 et au cours du mois d’avril 2015, des Puffinures plongeurs ont été découverts dans des terriers situés dans d’épaisses touffes d’herbes Poa cookii (tussock) de la zone côtière, sur une pente raide orientée au sud de la baie de Goodhope. Des recherches complémentaires menées en octobre 2015 et février 20216 ont confirmé la zone de reproduction sur une superficie d’environ 1 ha. La phénologie et le succès de reproduction de 36 nids localisés sur le même site ont été étudiés sur la période 2019-2020. Les oiseaux ont crié depuis leur terrier à partir de mi-septembre, la ponte a commencé début octobre et le premier poussin a été observé le 20 décembre. Le pic d’éclosion a eu lieu début janvier et les poussins se sont envolés de fin février à mi-mars. Cette phénologie de reproduction est similaire à celle observée sur l’archipel voisin de Crozet. Le taux de survie globale des nichées était de 46.4 ± 9.2% (σ; IC95%: 29.5–64.1%), la plupart des échecs se produisant autour de la période d’éclosion. Une surveillance complémentaire est nécessaire pour estimer si les souris domestiques Mus musculus introduites jouent un rôle dans le faible succès d’éclosion. Des zones de reproduction du Puffinure plongeur ont été découvertes dans d’autres zones côtières, principalement au sud et à l’est de l’île. Il est peu probable que la reproduction de cette espèce ait été négligée pendant trois décennies, ce qui laisse supposer que l’élimination des chats a permis au Puffinure plongeur de recoloniser l’île.

With thanks to Maëlle Connan and Stefan Schoombie..

Reference:

Connan, M., Schoombie, S., Schoombie, J., Dilley, B. & Ryan, P.G. 2022.  Natural recolonisation of sub-Antarctic Marion Island by Common Diving Petrels Pelecanoides urinatrix.  Ostrich doi.org/10.2989/00306525.2022.2150706.

John Cooper, ACAP News Correspondent, 20 December 2022

Light-mantled Albatrosses on Macquarie Island; photograph by Jaimie Cleeland

Long-term data analysis reveals species-specific responses to climate change between Black-browed Thalassarche melanophris and Light-mantled Phoebetria palpebrata albatrosses in the southwest Pacific Ocean according to new research.

The paper, “Multi-decadal changes in the at-sea distribution and abundance of black-browed and light-mantled sooty albatrosses in the southwest Pacific Ocean” by Milan Sojitra (Institute for Marine and Antarctic Studies, University of Tasmania, Australia) and colleagues, has been published open access in the journal ICES Journal of Marine Science.

Map of the study area. Red polygon represents the extent of the surveyed area over the study period. PF (Antarctic Polar Front), SAF (Subantarctic Front), and STF (Subtropical Front). Fronts are far more dynamic that these lines indicate. Here, they are shown as reference (mean representative). (Bathymetry data from ggOceanMapsData, Amante and Aakins, 2009, and Front data from Orsi and Harris, 2019).

The paper’s abstract follows:

“Many long-term studies have reported changes in seabird abundance and distribution in response to climate change and various anthropogenic activities. However, a greater understanding of how species are responding to change over large spatial and temporal scales are required—particularly at high latitudes such as the Southern Ocean. We examined black-browed Thalassarche melanophris (BBAL) and light-mantled sooty Phoebetria palpebrata albatross (LMSA) observations spanning over 50 years. Both species have a wide-ranging distribution in a rapidly changing Southern Ocean. We used generalized additive models (GAMs) to investigate environmental drivers of their abundance and occurrence. Our results show that climate indices, sea surface temperature and sea surface height are the main drivers influencing the distribution and abundance of both species. The abundance of BBAL southeast of Australia was observed to be decreased substantially whereas no significant change was observed in the abundance of LMSA. Both species demonstrated contrasting distributions along their latitudinal gradient with BBAL showing early stages of a southward range shift. Our analyses suggest that responses to climate change are species-specific. These rare, long-term data have provided an understanding of species’ responses to past changes in the marine environment and can provide critical information for future conservation and management.”

Reference:

Milan Sojitra, Eric J Woehler, Mary-Anne Lea, Simon Wotherspoon, Multi-decadal changes in the at-sea distribution and abundance of black-browed and light-mantled sooty albatrosses in the southwest Pacific Ocean, ICES Journal of Marine Science, Volume 79, Issue 10, December 2022, Pages 2630–2642, https://doi.org/10.1093/icesjms/fsac197

19 Decemebr 2022

The accompanying infographic to the Antarctic Climate Change and the Environment Decadal Synopsis (ACCE), illustrating key messages from the report

SCAR has collaborated with scientists across the globe to produce the Antarctic Climate Change and the Environment Decadal Synopsis (ACCE). The report summarises a decade’s worth of research, providing a concise compiled synopses of current understanding, explicit recommendations for actions to address change, and recommendations for additional research.

An animation (see below) and a set of illustrated infographics highlighting key messages from the report have been produced to accompany the report. The set of infographics to accompany the report are available from here.

The full report is available to download from the SCAR library. 

The report’s summary as follows: 

“Scientific evidence is abundantly clear and convincing that due to the current trajectory of human-derived emissions of CO2 and other greenhouse gases, the atmosphere and ocean will continue to warm, the ocean will continue to acidify, atmospheric and ocean circulation patterns will be altered, the cryosphere will continue to lose ice in all forms, and sea level will rise. 

While uncertainties remain about various aspects of the Earth System, what is known is beyond dispute. The trends, based on observations and confirmed by modelling, will accelerate if high rates of CO2 and other greenhouse gas emissions continue. 

The IPCC AR6 WGII Summary for Policymakers (SPM D.5.3) unambiguously emphasises this conclusion: The cumulative scientific evidence is unequivocal: Climate change is a threat to human well-being and planetary health. Any further delay in concerted anticipatory global action on adaptation and mitigation will miss a brief and rapidly closing window of opportunity to secure a liveable and sustainable future for all. 

Human influence on the climate is clear, with observed changes in the climate and in greenhouse gas concentrations unequivocally attributable to human activities. 

Human-induced climate change has caused extensive negative impacts, including losses to people and to nature, some of which are irreversible, such as the extinction of species. 

Climate change is increasingly exacerbating the impact of other human-caused effects on nature and human well-being, and the impacts are expected to grow with increasing climate change magnitude. 

Observations, modelling and global assessments describe significant changes in Antarctic physical and living systems, both marine and terrestrial. 

Changes in Antarctic and Southern Ocean environments are linked to and influence climate impact drivers globally. 

The most significant potential influence of Antarctica’s changes will be on global mean sea level change and its influence on society and nature in all coastal regions of the globe. 

Further global impacts influenced by Antarctic change include extreme climate and weather events, droughts, wildfires and floods, and ocean acidification. These impacts cause ecosystem disruption and loss of biodiversity beyond the Antarctic region. 

Under current projections, and without nations meeting the Nationally Determined Contributions of the Paris Climate Agreement, the rate of global change will outpace societal, political, and economic responses that will facilitate adaptation and strengthen resilience to the impacts of climate change. 

The agreements of the Antarctic Treaty System will not escape these influences. Rapidly changing Antarctic and Southern Ocean environments require similarly rapid environmental governance responses, including potential changes to agreements that have previously taken many years to reach. Impacts of climate change are also likely to challenge geopolitical relations in regions outside the Antarctic, in turn influencing relations within the Antarctic Treaty System. 

Past global arrangements and isolated responses have been ineffective in addressing cross-boundary challenges that require an Earth System approach. Research conducted in the Antarctic and Southern Ocean regions, and strong policies developed from its results, are critical for the development of an integrated Earth System approach and the discernment of a path to a sustainable future for the planet. 

Cooperative and coordinated international responses are required to address critical research needs in Antarctica and the Southern Ocean. In turn, receptive Antarctic governance is needed to use the knowledge generated by the research to create effective policy and decisions. Enhanced investment in science will provide policymakers and planners with more comprehensive and coherent sets of information over time to help put in place timely, scalable adaptation and mitigation strategies. Investment in new science and technology that provides updated information on the likelihood of major drivers of climate risk will more than repay itself. 

Science communication and education in partnership with other cultural and societal actors is essential to enable further appreciation of the value of Antarctica and the Southern Ocean for current and future human well-being, for biodiversity, and for the interdependence of humans and nature.

To limit further change, immediate and deep emissions reductions are required across all sectors. 

Effective action is now more urgent than it has ever been. “

Reference: 

Chown, S.L., Leihy, R.I., Naish, T.R., Brooks, C.M., Convey, P., Henley, B.J., Mackintosh, A.N., Phillips, L.M., Kennicutt, M.C. II & Grant, S.M. (Eds.) (2022) Antarctic Climate Change and the Environment: A Decadal Synopsis and Recommendations for Action. Scientific Committee on Antarctic Research, Cambridge, United Kingdom. www.scar.org

Friday 16 December 2022