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Caribbean ecosystem reconstructed prior to human settlement
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Caribbean ecosystem reconstructed prior to human settlement
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Desiree
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Posts: 3882
Caribbean ecosystem reconstructed prior to human settlement
«
on:
February 26, 2014, 05:57:31 pm »
Abaco Island in the northern Bahamas. Image: Chip Gallent (Flickr, used under a CC BY 3.0)
Caribbean ecosystem reconstructed prior to human settlement
Article created on Sunday, February 23, 2014
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Assembling a picture of past environments involves a great deal of forensic detective work. However, the result gives a clearer understanding of how natural and human forces have changed environments in the past, allowing insights into the reasons modern-day changes take place.
Working with elusive evidence, Janet Franklin, Arizona State University (ASU) professor of geography, took part in a project to understand the profound changes in plant and animal life that occurred on the islands of the West Indies from the end of the last Ice Age over 12,000 years ago and how humans impacted on the environment.
Intriguing fossils
A paper published by Franklin and her colleagues reports on an intriguing fossil deposit discovered on Abaco Island in the Northern Bahamas in 2009. The fossils are embedded in a layer of peat – organic soil – that is buried under beach sand and is only exposed a few days a year, during extremely low tides.
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Desiree
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Posts: 3882
Re: Caribbean ecosystem reconstructed prior to human settlement
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Reply #1
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February 26, 2014, 05:58:49 pm »
The site was first discovered by Perry Maillis, a land owner in South Abaco and an avid beach comber. This find would lead to evidence of the first inhabitants of The Bahamas and the species that became extinct because of their impact on the islands. The bones were from an extinct large tortoise (Albury’s tortoise) which was radiocarbon dated to over 900 years old.
Collecting samples
In the years since the peaty sediment was first discovered, Franklin and her colleagues, along with the owner of the area, have taken advantage of brief low-tide periods to collect samples of the peat and extract further remains. Their finds now also include the near vanished Cuban crocodile (no longer found anywhere except a small region of Cuba) to small fragments of plants and molluscs.
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This power came forth out of the Atlantic Ocean. But afterwards there occurred violent earthquakes and floods; and in a single day and night of misfortune all your warlike men in a body sank into the earth, and the island of Atlantis in like manner disappeared in the depths of the sea.
Desiree
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Posts: 3882
Re: Caribbean ecosystem reconstructed prior to human settlement
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Reply #2
on:
February 26, 2014, 06:01:19 pm »
First settlers
Radiocarbon dating shows the peat and its fossils to be 900-950 years old, which coincides with the first arrival of people on Abaco. These first settlers were Lucayan Taino Amerindians – the first peoples encountered by Christopher Columbus in the New World, 500 years later.
The charcoal-rich sediments suggest that the peat was deposited very quickly when this agricultural based culture first colonized the island and began to clear land for their crops by burning. This also points to the species recovered from the peat deposit in Gilpin Point to represent a snapshot of animal and plant life at the time of first human presence.
Of the 17 identified species of amphibians, reptiles, birds and mammals, the researchers found only 10 still live on Abaco – a major change in the animal life on the island. Unhealed bite marks on the inside of the thick carapaces of the green turtle show that they were scavenged by Cuban crocodiles after being butchered by humans.
The concentrated remains of large, edible animals suggest that this was an Amerindian kitchen midden. Frustratingly, the researchers initially found almost no cultural artefacts in the peat deposit. The most direct evidence of humans eventually discovered was one tiny polished shell bead. However, the deposit is only occasionally exposed and so in time, more artefacts may appear.
Janet Franklin is a professor in the School of Geographical Sciences and Urban Planning, an academic unit of the College of Liberal Arts and Sciences, as well as a senior sustainability scientist in the Global Institute of Sustainability.
Source: ASU
More Information
David W Steadman, Nancy A Albury, Perry Maillis, Jim I Mead, John Slapcinsky, Kenneth L Krysko, Hayley M Singleton, and Janet Franklin.” Late-Holocene faunal and landscape change in the Bahamas.” The Holocene February 2014 24: 220-230, first published on January 7, 2014 DOI: 10.1177/0959683613516819
Cite this article
ASU. Caribbean ecosystem reconstructed prior to human settlement. Past Horizons. February 23, 2014, from
http://www.pasthorizonspr.com/index.php/archives/02/2014/caribbean-ecosystem-reconstructed-prior-to-human-settlement
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Karissa Oleyanin
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Re: Caribbean ecosystem reconstructed prior to human settlement
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Reply #3
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February 27, 2014, 03:08:21 am »
What ecosystem greeted the first human settlers in the northern Caribbean?
Feb 14, 2014 by Barbara Trapido-Lurie
What ecosystem greeted the first human settlers in the northern Caribbean?
The Gilpin Point peat, Abaco Island, The Bahamas, is only exposed during extremely low tides. Credit: Nancy Albury
(Phys.org) —Assembling a picture of past environments always involves detective work. The reward is a clearer understanding of how natural and human forces have changed environments in the past, giving insights to how modern-day environmental changes take place.
Working with especially elusive evidence, Janet Franklin, ASU professor of geography, is participating in an effort to understand the profound changes in plant and animal life that occurred on the oceanic islands of the West Indies since the end of the last ice age.
A paper recently published by Franklin and her colleagues – scientists from University of Florida (including lead author David Steadman), the Commonwealth of the Bahamas and Eastern Tennessee State University – reports on an intriguing fossil deposit discovered on Abaco Island in the northern Bahamas in 2009. The fossils are embedded in a layer of peat – organic soil – that is buried under beach sand and is only exposed a few days a year, during extremely low tides.
In the years since the peaty sediment was first discovered, Franklin and her colleagues, along with the owner of the area, have taken advantage of brief low-tide periods to collect samples of the peat and extract fossils. Their finds range from remains of an extinct large tortoise (Albury's tortoise) to the extirpated Cuban crocodile (no longer found anywhere except a small region of Cuba), to small fragments of plants and mollusks.
Radiocarbon dating shows the peat and its fossils to be 900-950 years old, which coincides with the first arrival of people on Abaco. (These first settlers were Lucayan Taino Amerindians – the first peoples encountered by Christopher Columbus in the New World, 500 years later.)
The charcoal-rich sediments suggest that the peat was deposited very quickly when these agricultural people first colonized the island and began to clear land for their crops by burning. Thus, fossils retrieved from this peat deposit in Gilpin Point, Abaco, represent animal life at the time of first human presence.
Of the 17 identified species of amphibians, reptiles, birds and mammals the researchers found, only 10 still live on Abaco – a major change in the animal life on the island. Unhealed bite marks on the inside of the thick carapaces of the green turtle show that they were scavenged by Cuban crocodiles after being butchered by humans.
The concentrated remains of large, edible animals suggest that this was an Amerindian kitchen midden. Frustratingly, the researchers initially found almost no cultural artifacts in the peat deposit. The most direct evidence of humans eventually discovered was one tiny polished shell bead. However, the deposit is only occasionally exposed and, undoubtedly, it has a large extent that is yet to be observed, much less studied.
Landowner Perry Maillis is a keen observer, and with his help and careful oversight from Nancy Albury, a vertebrate paleontologist with The Bahamas Antiquities, Museums and Monuments Corporation (AMMC), the team hopes to recover more material from this unique site in the future in order to learn about the fascinating prehistory of animals, plants and people in the northern Bahamas.
Explore further: The Vikings were not the first colonizers of the Faroe Islands
More information: David W Steadman, Nancy A Albury, Perry Maillis, Jim I Mead, John Slapcinsky, Kenneth L Krysko, Hayley M Singleton, and Janet Franklin." Late-Holocene faunal and landscape change in the Bahamas." The Holocene February 2014 24: 220-230, first published on January 7, 2014 DOI: 10.1177/0959683613516819
http://phys.org/news/2014-02-ecosystem-human-settlers-northern-caribbean.html
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