Tag: Antarctica

Ancient Penguin Fossils Offer New Window into Antarctica’s Changing Climate

A team of palaeontologists studying penguin fossils from Seymour Island have demonstrated how ancient bird bones can act as chemical archives of past climate change.

A team of palaeontologists from China University of Geosciences (Beijing) studying penguin fossils from Seymour Island off the Antarctic Peninsula have demonstrated how ancient bird bones can act as chemical archives of past climate change.

The researchers used non-destructive X-ray mapping to examine the elemental composition of penguin remains spanning millions of years. As such, they uncovered key insights into how Antarctica shifted from a warm and humid environment to a cooler world.

“Penguins are among the most iconic animals of Antarctica and represent one of the most distinctive groups of birds, having completely lost the ability to fly and instead using their flipper-like wings for swimming.

Seymour Island preserves one of the world’s richest and most stratigraphically continuous records of Eocene penguin fossils. These fossils span an important interval of Antarctic climate evolution, from the relatively warm and humid conditions of the early Eocene to the cooler climate of the middle and late Eocene.”
The Research Team

Sampling area – Tertiary Eocene La Meseta Formation on Seymour Island. Image credit: Boyang Xia et al.
Sampling area – Submeseta Formation on Seymour Island. Image credit: Boyang Xia et al.

To study the rare fossils without damaging them, the researchers used micro-X-ray fluorescence scanning to map chemical elements across the surface of the bones. The scans revealed clear differences in the chemical composition of bones from different geological periods.

Older fossils dating back roughly 55 million years contained significantly higher levels of titanium, silicon and potassium. The team linked these chemical patterns to intense land-based weathering and heavy runoff during an ancient warm period, whereas younger fossils from cooler periods showed much lower elemental signals.

“The most surprising result was that the early Eocene fossil showed substantially higher titanium, silicon and potassium signals.

Based on the stratigraphic, sedimentological and palaeoclimatic evidence, we interpret this pattern as being consistent with stronger continental weathering and terrestrial material input under the warm and humid conditions of the early Eocene.”

Analysing millions-of-years-old fossils presented distinct practical challenges:

“One of the main challenges was obtaining reliable elemental information without damaging the fossils.

The irregular shapes and curved surfaces of the fossil bones created practical difficulties during scanning. To minimise the influence of variations in surface height, we positioned the bones as horizontally as possible and maintained a relatively constant distance between the scanning head and the bone surface.”

Overview of the fossil specimens and the µ-XRF scanning area. Image credit: Boyang Xia et al.

Beyond tracking weather conditions on land, the scanning method also detected iron, manganese and sulphur patterns trapped within the bones, reflecting local chemical changes in the marine sediment as the fossils were buried over time.

The team additionally highlights that studying bone geochemistry offers a valuable tool for understanding historical Earth systems alongside traditional techniques such as marine sediment drilling and microfossil analysis.

“An important finding for us was that the elemental information preserved in penguin bones may record not only how external materials entered the bones, but also differences in weathering input, depositional conditions and early diagenetic environments.

We believe that fossils can provide an important complementary source of information for studying palaeoenvironmental changes on the Antarctic Peninsula.”

The study, published in the open-access journal Fossil Record, demonstrates how combining non-destructive chemical scanning with established geological context can unlock valuable environmental data from fossil collections, thus broadening the scope of future polar research.

Original source:

Xia B, Wu H, Li Q (2026) Eocene penguin fossils as archives of Antarctic weathering and climate change: insights from micro-X-ray fluorescence elemental mapping. Fossil Record 29(2): 575-587. https://doi.org/10.3897/fr.29.192319

For more articles on palaeontology, visit the Fossil Record website and follow the journal on BlueSky and Facebook.

Tag team: a tale of two Antarctic blue whales

For the first time, the satellite tracks of two Antarctic blue whales, tagged a decade ago, have been published in the open-access Biodiversity Data Journal.

Ten years ago, Dr Virginia Andrews-Goff was riding the bowsprit of a six-metre boat, as a 30-metre, 120-tonne Antarctic blue whale surfaced alongside.

That day in the Southern Ocean, she became the first and, so far, the only person, to deploy satellite tags on two of these critically endangered and rarely sighted giants.

Scientists approach a 30 metre blue whale in their six metre boat. **©Kylie Owens/Australian Antarctic Division**

At the time, her success added weight to a case in the United Nations International Court of Justice, demonstrating that scientific research on whales could be conducted without killing them.

Dr Andrews-Goff and her colleagues at the Australian Antarctic Division have now published the two satellite tracks generated by that 2013 work, in the open-access Biodiversity Data Journal.

This is a unique data set that was incredibly challenging to get.
Dr Virginia Andrews-Goff

The tracks give an insight into the animals’ movement and behaviour on their feeding grounds, and illustrate the significant logistical challenges needed to successfully locate, tag, and track Antarctic blue whales.

“This is a unique data set that was incredibly challenging to get, and, unfortunately, for 10 years no-one has been able to generate more data,” Dr Andrews-Goff said.

“We know very little about the movement and distribution of Antarctic blue whales, where they migrate, where they forage and breed, and we don’t understand the threats they might face as they recover from whaling.”

Two satellite tagged Antarctic blue whales have provided the first insights into the movement and behaviour of these critically endangered ocean giants on their feeding grounds. **©Australian Antarctic Division**

Part of the issue is that the animals are incredibly difficult to find. Commercial whaling in the 1960s and ‘70s killed about 290,000 Antarctic blue whales, accounting for 90% of the population. By the late 1990s, the world’s population of Antarctic blue whales was estimated at 2280 animals.

Back in 2013, the research team used novel acoustic tracking techniques to detect blue whale calls and hone in on their location from up to 1000 kilometres away. Once the whales were in sight (in two separate locations), an expert crew manoeuvred close to their fast-moving targets.

The satellite tags showed that the whales travelled 1390 kilometres in 13 days and 5550 kilometres in 74 days, with an average distance of more than 100 kilometres per day.

“The two whales did entirely different things, but what became obvious is that these animals can travel really quickly,” Dr Andrews-Goff said.

“If you consider how far and fast these animals moved, protecting the broader population against potential threats will be tricky because they could potentially circumnavigate Antarctica within a single feeding season.”

his map shows the movement of two satellite tagged Antarctic blue whales. The track on the bottom right are the movements of one whale over 13 days. The other three tracks capture segments of movement by the second whale over 74 days. The tag for this second whale did not transmit data consistently, resulting in data gaps throughout the tracking period.
The blue portions of track show where the whales were moving quickly and directly, suggesting they were in transit, while the orange locations show where they slowed down and appeared to be searching or foraging. ©Australian Antarctic Division

Since the tracks were obtained, new analytical methods have added some behavioural context to the data.

Two movement rates were observed – a faster ‘in transit’ speed averaging 4.2 km/hr and a slower speed of 2.5 km/hr, thought to correspond with searching or foraging.

“It looks like the whales might hang around in one area to feed and then move quickly to another area and hang around there for another feed,” Dr Andrews-Goff said.

“There may be certain areas that are better feeding grounds than others. From a management perspective, it would be good to understand what is it that makes these areas important?”

Even at a sample size of two, Dr Andrews-Goff said the satellite tracks will assist the International Whaling Commission’s management of Antarctic blue whales, by providing initial insights into blue whale foraging ecology, habitat preferences, distribution, movement rates, and feeding. These will inform an in-depth assessment of Antarctic blue whales due to begin in 2024.

Original source:

Andrews-Goff V, Bell EM, Miller BS, Wotherspoon SJ, Double MC (2022). Satellite tag derived data from two Antarctic blue whales (Balaenoptera musculus intermedia) tagged in the east Antarctic sector of the Southern Ocean. Biodviersity Data Journal 10: e94228 https://doi.org/10.3897/BDJ.10.e94228

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American scientists discover the first Antarctic ground beetle

Fossilised forewings from two individuals, discovered on the Beardmore Glacier, revealed the first ground beetle known from the southernmost continent. It is also the second beetle for the Antarctic insect fauna with living descendants. The new species, which for now is also the sole representative of a new genus, is to be commonly known as Ball’s Antarctic Tundra Beetle. Scientists Dr Allan Ashworth, North Dakota State University, and Dr Terry Erwin, Smithsonian Institution, published their findings in the open access journal ZooKeys.

The insect fauna in Antarctica is so poor that today it consists of only three species of flightless midges, with one of them having been probably introduced from the subantarctic island of South Georgia. The absence of biodiversity is considered to be a result of lack of moisture, vegetation and low temperatures.

Following their study, the authors conclude that the beetle must have inhabited the sparsely-vegetated sand and gravel banks of a meltwater-fed stream that was once part of an outwash plain at the head of a fjord in the Transantarctic Mountains. Plants associated with the extinct beetle include southern beech, buttercup, moss mats, and cushion plants, all typical for a tundra ecosystem. The species may or may not have been able to fly.

The closest modern relatives to the extinct species live in South America, the Falkland Islands, South Georgia, Tasmania and Australia. Tracking the ancient lineage of this group of beetles, known as the carabid beetle tribe Trechini, confirms that they were once widely distributed in Gondwana, the supercontinent that used to unite what today we recognise as Antarctica, South America, Africa, Madagascar, Australia, the Arabian Peninsula and the Indian Subcontinent. Ball’s Antarctic Tundra Beetle is also an evidence that even after Gondwana broke apart, the tundra ecosystem persevered in Antarctica for millions of years.

“The conflicting signals both in anatomical attributes and biogeography, and in ecological setting as well, leave open the question of relationships, thus giving us no alternative but to flag the species represented by fossil evidence through erection of new genus status, hence drawing attention to it and the need for further paleontological studies in Antarctica,” speak of their discovery the authors.

The new Ball’s Antarctic Tundra Beetle is scientifically identified as Antarctotrechus balli, where the genus name (Antarctotrechus) refers to its being related to the tribe Trechini, and the species name (balli) honours distinct expert of ground beetles Dr. George E. Ball, who celebrated his 90th birthday on 26th September, 2016.

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Original source:

Ashworth AC, Erwin TL (2016) Antarctotrechus balli sp. n. (Carabidae, Trechini): the first ground beetle from Antarctica. ZooKeys 635: 109-122. https://doi.org/10.3897/zookeys.635.10535