Ancient Sheldachthacks Settled the Chatham Islands 390,000 Years Ago

A collaborative team of paleontologists from New Zealand and Australia has identified a new, extinct species of Shelduck from Holocene fossil bone deposits located in the Likov Chatham Islands.



The artistic reconstruction of rēkohu Shelduck (Tadnarekov) highlights the dark feathers typical of island-dwelling birds. Image credit: Sasha Votyakova/Te Papa.

The rēkohushelduck (Tadnarekov) is a newly described species that inhabited the Chatham Islands, a remote archipelago situated 785 km east of the New Zealand mainland.

“The archipelago comprises Chatham Island, Rangihautepit, Mangere, Tapua, and various smaller islands,” explained the researchers.

“These islands were completely submerged during the late Miocene and early Pliocene epochs.”

“Subsequent geological activities resulted in their re-emergence roughly three million years ago.”

According to the research team, the ancestors of the Rēkohu Shelduck reached the Chatham Islands around 390,000 years ago, during the late Pleistocene.

“While this may seem like a brief period, it’s long enough to influence species development,” Dr. Lawrence noted.

“At that time, the Rēkohu Shelduck exhibited shorter, more robust wings and longer leg bones, adaptations that impacted flight capability.”

“These evolutionary changes resulted from various factors, such as ample food availability, a lack of ground predators, and windy conditions, making flight less necessary.”

“If you don’t use them, you lose them; wings start to diminish,” remarked Dr. Pascare Lube from University of Otago.

“Flying is energy-efficient, so if it’s not essential, why expend the effort?”

“More robust leg bones support increased muscle mass and strength for takeoff, which is crucial when wings are small.”

The researchers utilized ancient DNA analysis and bone morphology to characterize the rēkohushelduck, a cousin of the Paradise Shelduck (Tadorna variegata) native to New Zealand.

Rēkohu Shelduck spent a majority of its time on the ground and became extinct prior to the 19th century.

“The discovery of rēkohushelduck bones in early Moriori Midden deposits indicates that hunting likely contributed to its extinction prior to European contact and the subsequent Māori settlements in the 19th century,” the scientists reported.

Their study was published in the July 2025 issue of The Linnaean Society’s Journal of Zoology.

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Nicholas J. Lawrence et al. 2025. Ancient DNA and morphometrics reveal a new species of Shelduck, an extinct island inhabitant from the Rēkohu Chatham Islands. The Linnaean Society’s Journal of Zoology 204 (3): ZLAF069; doi: 10.1093/zoolinnean/zlaf069

Source: www.sci.news

Cyprus settled by hunter-gatherers much earlier than previously believed

With persistent stories of isolation, inaccessibility, and unattractiveness, one of the eastern Mediterranean islands was first populated by an influx of agricultural populations from the mainland under demographic pressures. It is generally considered to be a Neolithic phenomenon that began with. New research led by Professor Corey Bradshaw from Flinders University shows Cyprus may have been settled by hunter-gatherers by about 14,000 to 13,000 years ago, earlier than previously recognized. . This process must have involved a small number of large-scale migration events (hundreds to thousands of people), which infers the intentions and organization of these early humans.



Bradshaw uses the latest archaeological data, afterthought climate projections, and demographic models of age structure to other. They demonstrate evidence of an early arrival on Cyprus (14,257-13,182 years ago), within two to three major events occurring within 100 years, to ensure the risk of extinction is low. They expected a large group (1,000 to 1,375 people) to arrive.Image credit: Bradshaw other., doi: 10.1073/pnas.2318293121.

In researching when Cyprus was first occupied by humans, Professor Bradshaw and his colleagues discovered that the large Mediterranean islands were an attractive and preferred destination for Paleolithic people.

Their findings contradict previous research that suggested Mediterranean islands would have been inaccessible and inhospitable for Pleistocene hunter-gatherer societies.

Archaeologists used archaeological data, climate estimates, and demographic modeling to uncover Cyprus's early people.

Analysis of archaeological dating from the 10 oldest sites across Cyprus suggests that first human habitation dates between 14,257 and 13,182 years ago, which is longer than previously thought. It is also much older.

“The islands were then rapidly settled. Climate modeling shows that this early hominin population was able to survive in tandem with increases in temperature, precipitation, and environmental productivity sufficient to sustain large hunter-gatherer populations. “We show that this is the case,” the researchers said.

Based on demographic models, we believe that large groups of hundreds to thousands of people arrived in Cyprus over two or three major migration events within 100 years.

“This settlement pattern suggests systematic planning and the use of advanced vessels,” Professor Bradshaw said.

Within 300 years, or 11 generations, Cyprus' population grew to a median of 4,000 to 5,000 people.

Dr Theodora Muzio, an archaeologist at James Cook University and the University of Cyprus, said: “This result suggests that Cyprus, and perhaps other Mediterranean islands, were more likely to be inhospitable places for Paleolithic hunter-gatherer societies. “This suggests that it would have been an attractive destination.”

“The dispersal and settlement of humans in Cyprus and other eastern Mediterranean islands was due to rapid climate change, with coastal regions inundated by post-ice age sea level rise and farmers forced to move to new locations. , it is argued that this is due to demographic pressures on the mainland, an area of ​​necessity rather than choice.”

“This interpretation has arisen as a result of significant gaps in the archaeological record of Cyprus, resulting from differences in the preservation of archaeological materials, bias in preservation, uncertainties associated with dating, and limited DNA evidence. '' said Australian Museum of Archaeology's archaeologist Dr Christian Liebmeyer. Australian Biodiversity and Heritage Research Council Center of Excellence, German Institute of Archaeology, and James Cook University.

“Our research, based on more archaeological evidence and advanced modeling techniques, changes that.”

“New findings highlight the need to reconsider the question of early human migration in the Mediterranean and test the validity of the perceived early settlement dates in the light of new technologies, field survey methods and data. ' said Professor Bradshaw.

Regarding this research, paper Published in Proceedings of the National Academy of Sciences.

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Corey J.A. Bradshaw other. 2024. Demographic models predict the onset of the late Pleistocene and rapid expansion of pre-agro-pastoralism in Cyprus. PNAS 121 (21): e2318293121; doi: 10.1073/pnas.2318293121

Source: www.sci.news