Antarctic polar ice cap is 33.6 million years old

Escrito por

64519 The Antarctic continental ice cap came into existence some 33.6 million years ago, according to new data from an international expedition.

The expedition was led by the Andalusian Institute of Earth Sciences (IACT) – a Spanish National Research Council-University of Granada joint centre.

Before the ice covered Antarctica, Earth was a warm place with a tropical climate. In this region, plankton diversity was high until glaciation reduced the populations leaving only those capable of surviving in the new climate.

The Integrated Ocean Drilling Programme international expedition obtained this information from the paleoclimatic history preserved in sediment strata in the Antarctic depths.

«The fossil record of dinoflagellate cyst communities reflects the substantial reduction and specialisation of these species that took place when the ice cap became established and, with it, marked seasonal ice-pack formation and melting began,» said Carlota Escutia, IACT researcher who led the expedition.

The appearance of the Antarctic polar icecap marks the beginning of plankton communities that are still functioning today.

This ice-cap is associated with the ice-pack, the frozen part that disappears and reappears as a function of seasonal climate changes.

When the ice-pack melts as the Antarctic summer approaches, this marks the increase in primary productivity of endemic plankton communities, researchers found.

When it melts, the ice frees the nutrients it has accumulated and these are used by the plankton. Escutia said «this phenomenon influences the dynamics of global primary productivity.»

Since ice first expanded across Antarctica and caused the dinoflagellate communities to specialise, these species have been undergoing constant change and evolution.

However, Escutia believes «the great change came when the species simplified their form and found they were forced to adapt to the new climatic conditions.»

Pre-glaciation sediment contained highly varied dinoflagellate communities, with star-shaped morphologies. When the ice appeared 33.6 million years ago, this diversity was limited and their activity subjected to the new seasonal climate.

The study was published in the journal Science.

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Antarctic polar ice cap is 33.6 million years old

Escrito por

64519 The Antarctic continental ice cap came into existence some 33.6 million years ago, according to new data from an international expedition.

The expedition was led by the Andalusian Institute of Earth Sciences (IACT) – a Spanish National Research Council-University of Granada joint centre.

Before the ice covered Antarctica, Earth was a warm place with a tropical climate. In this region, plankton diversity was high until glaciation reduced the populations leaving only those capable of surviving in the new climate.

The Integrated Ocean Drilling Programme international expedition obtained this information from the paleoclimatic history preserved in sediment strata in the Antarctic depths.

«The fossil record of dinoflagellate cyst communities reflects the substantial reduction and specialisation of these species that took place when the ice cap became established and, with it, marked seasonal ice-pack formation and melting began,» said Carlota Escutia, IACT researcher who led the expedition.

The appearance of the Antarctic polar icecap marks the beginning of plankton communities that are still functioning today.

This ice-cap is associated with the ice-pack, the frozen part that disappears and reappears as a function of seasonal climate changes.

When the ice-pack melts as the Antarctic summer approaches, this marks the increase in primary productivity of endemic plankton communities, researchers found.

When it melts, the ice frees the nutrients it has accumulated and these are used by the plankton. Escutia said «this phenomenon influences the dynamics of global primary productivity.»

Since ice first expanded across Antarctica and caused the dinoflagellate communities to specialise, these species have been undergoing constant change and evolution.

However, Escutia believes «the great change came when the species simplified their form and found they were forced to adapt to the new climatic conditions.»

Pre-glaciation sediment contained highly varied dinoflagellate communities, with star-shaped morphologies. When the ice appeared 33.6 million years ago, this diversity was limited and their activity subjected to the new seasonal climate.

The study was published in the journal Science.

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Antarctica Ice Cap Came Into Existence 3.6 Million Years Ago: Study

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64519 An interesting finding reveals that the ice cap of Antarctica came into existence some 3.6 million years ago during the Oligocene epoch, according to a news release.

The discovery was based on data retrieved from an international expedition led by the Andalusian Institute of Earth Sciences (IACT), a Spanish National Research Council-University of Granada joint center. Researchers came up with the findings after analyzing information contained in the ice sediments from various depths.

The study states that the Earth was a warm place with a tropical climate before the ice covered Antarctica. The region was rich in plankton diversity. However, their population suffered and dropped in number during the glacial period. Those that managed to adapt to the new climate were the ones that survived.

«The fossil record of dinoflagellate cyst communities reflects the substantial reduction and specialization of these species that took place when the ice cap became established and, with it, marked seasonal ice-pack formation and melting began,» says IACT researcher Carlota Escutia, who led the expedition.

The phytoplanktons that are visible today are the ones that appeared during the formation of the ice caps at Antarctica, and have survived the changes. The ice cover at Antarctica is extremely seasonal: during summer, there is very little ice, as the ice caps melt. The melting of the ice caps increases the production of the plankton community that resides in the region. The melted ice reappears and the frozen ice expands to an area equal to that of Antarctica during the winter. When the ice melts, the trapped nutrients are freed and are used by the plankton. This event influences the dynamics of global primary productivity.

Ever since the ice first expanded across Antarctica and supported the community of dinoflagellate to survive, these species have been exposed to constant change and evolution.

«The great change came when the species simplified their form and found they were forced to adapt to the new climatic conditions,» says Dr. Escutia.

The details of the findings have been published in the journal Science.

Descargar

Antarctica Ice Cap Came Into Existence 3.6 Million Years Ago: Study

Escrito por

64519 An interesting finding reveals that the ice cap of Antarctica came into existence some 3.6 million years ago during the Oligocene epoch, according to a news release.

The discovery was based on data retrieved from an international expedition led by the Andalusian Institute of Earth Sciences (IACT), a Spanish National Research Council-University of Granada joint center. Researchers came up with the findings after analyzing information contained in the ice sediments from various depths.

The study states that the Earth was a warm place with a tropical climate before the ice covered Antarctica. The region was rich in plankton diversity. However, their population suffered and dropped in number during the glacial period. Those that managed to adapt to the new climate were the ones that survived.

«The fossil record of dinoflagellate cyst communities reflects the substantial reduction and specialization of these species that took place when the ice cap became established and, with it, marked seasonal ice-pack formation and melting began,» says IACT researcher Carlota Escutia, who led the expedition.

The phytoplanktons that are visible today are the ones that appeared during the formation of the ice caps at Antarctica, and have survived the changes. The ice cover at Antarctica is extremely seasonal: during summer, there is very little ice, as the ice caps melt. The melting of the ice caps increases the production of the plankton community that resides in the region. The melted ice reappears and the frozen ice expands to an area equal to that of Antarctica during the winter. When the ice melts, the trapped nutrients are freed and are used by the plankton. This event influences the dynamics of global primary productivity.

Ever since the ice first expanded across Antarctica and supported the community of dinoflagellate to survive, these species have been exposed to constant change and evolution.

«The great change came when the species simplified their form and found they were forced to adapt to the new climatic conditions,» says Dr. Escutia.

The details of the findings have been published in the journal Science.

Descargar

Antarctic polar icecap formed ‘33.6 million years ago

Escrito por

64519 The Antarctic continental ice cap came into existence during the Oligocene epoch, some 33.6 million years ago, according to data from an international expedition. 

These findings were based on information contained in ice sediments from different depths.

The expedition led by the Andalusian Institute of Earth Sciences (IACT)-a Spanish National Research Council-University of Granada joint centre.

Before the ice covered Antarctica, the Earth was a warm place with a tropical climate. In this region, plankton diversity was high until glaciation reduced the populations leaving only those capable of surviving in the new climate.

The Integrated Ocean Drilling Program international expedition has obtained this information from the paleoclimatic history preserved in sediment strata in the Antarctic depths.

IACT researcher Carlota Escutia, who led the expedition, explained that «the fossil record of dinoflagellate cyst communities reflects the substantial reduction and specialization of these species that took place when the ice cap became established and, with it, marked seasonal ice-pack formation and melting began».

The appearance of the Antarctic polar icecap marks the beginning of plankton communities that are still functioning today. This ice-cap is associated with the ice-pack, the frozen part that disappears and reappears as a function of seasonal climate changes.

The researchers explained that when the ice-pack melts as the Antarctic summer approaches, this marks the increase in primary productivity of endemic plankton communities. When it melts, the ice frees the nutrients it has accumulated and these are used by the plankton.

Dr Escutia said that «this phenomenon influences the dynamics of global primary productivity».

Since ice first expanded across Antarctica and caused the dinoflagellate communities to specialize, these species have been undergoing constant change and evolution. However, the IACT researcher thinks «the great change came when the species simplified their form and found they were forced to adapt to the new climatic conditions».

Pre- glaciation sediment contained highly varied dinoflagellate communities, with star-shaped morphologies. When the ice appeared 33.6 million years ago, this diversity was limited and their activity subjected to the new seasonal climate.

The results have recently been published in the journal Science.

Descargar

Antarctic polar icecap formed ‘33.6 million years ago

Escrito por

64519 The Antarctic continental ice cap came into existence during the Oligocene epoch, some 33.6 million years ago, according to data from an international expedition. 

These findings were based on information contained in ice sediments from different depths.

The expedition led by the Andalusian Institute of Earth Sciences (IACT)-a Spanish National Research Council-University of Granada joint centre.

Before the ice covered Antarctica, the Earth was a warm place with a tropical climate. In this region, plankton diversity was high until glaciation reduced the populations leaving only those capable of surviving in the new climate.

The Integrated Ocean Drilling Program international expedition has obtained this information from the paleoclimatic history preserved in sediment strata in the Antarctic depths.

IACT researcher Carlota Escutia, who led the expedition, explained that «the fossil record of dinoflagellate cyst communities reflects the substantial reduction and specialization of these species that took place when the ice cap became established and, with it, marked seasonal ice-pack formation and melting began».

The appearance of the Antarctic polar icecap marks the beginning of plankton communities that are still functioning today. This ice-cap is associated with the ice-pack, the frozen part that disappears and reappears as a function of seasonal climate changes.

The researchers explained that when the ice-pack melts as the Antarctic summer approaches, this marks the increase in primary productivity of endemic plankton communities. When it melts, the ice frees the nutrients it has accumulated and these are used by the plankton.

Dr Escutia said that «this phenomenon influences the dynamics of global primary productivity».

Since ice first expanded across Antarctica and caused the dinoflagellate communities to specialize, these species have been undergoing constant change and evolution. However, the IACT researcher thinks «the great change came when the species simplified their form and found they were forced to adapt to the new climatic conditions».

Pre- glaciation sediment contained highly varied dinoflagellate communities, with star-shaped morphologies. When the ice appeared 33.6 million years ago, this diversity was limited and their activity subjected to the new seasonal climate.

The results have recently been published in the journal Science.

Descargar

Los encuentros de Franco con los líderes árabes y musulmanes, objeto de estudio de una revista de la UGR

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«El pasado no es suficiente: temáticas y conflictos en los encuentros de Franco con los líderes árabes y musulmanes» es el título del estudio publicado por la profesora de la Universidad Carlos III de Madrid, Matilde Eiroa San Francisco, en el volumen 62 de la revista «Miscelánea de Estudios Árabes y Hebraicos» (sección Árabe-Islam) de la Universidad de Granada. 

La autora analiza en su artículo la política exterior de España con el mundo araboislámico desde la perspectiva de los encuentros personales de Franco con los dirigentes de dicha región. Según la profesora Matilde Eiroa, «estas reuniones son indicadoras de las relaciones públicas internacionales y del grado de afinidad y apoyo recíproco que se ofrecen los Estados participantes. Los objetivos fueron variados, pero, sobre todo, sirvieron como herramienta propagandística de gran valor para la imagen del Régimen».

La acción exterior española se volcó, a partir de 1945, hacia nuevos Estados debido a la soledad del Régimen y a la necesidad de buscar nuevas uniones para derribar la potente muralla que Occidente había alzado frente a España. «Franco encontró en los árabes –afirma la investigadora de la Universidad Carlos III– a interlocutores aceptables y descubrió en la Historia y en su propia biografía argumentos lícitos para coordinar una campaña que le allanara el camino hacia el estrechamiento de lazos. Estos elementos, sumados a la coincidencia del final del régimen colonial, la voluntad árabe de tener una presencia internacional y el bloqueo diplomático efectuado a España, funcionaron como factores determinantes para la aproximación a esta región».

La dimensión araboislámica de la política exterior pudo proporcionar a España grandes oportunidades para tomar parte en decisiones internacionales de gran trascendencia. La coyuntura excepcional de esta relación con el gobierno más anticomunista de Europa obedece al temor de algunos países como Jordania, Arabia Saudí o Egipto de caer en el ámbito de la URSS. De hecho, en los años cincuenta coincidieron un conjunto de acontecimientos en el Próximo y Medio Oriente, que amenazaban con bascular la balanza del lado soviético. «El triunfo de Naser en Egipto y la creación de la República Árabe Unida precedieron a la revolución en Líbano, la instauración de la república en Irak, un golpe de estado en Argelia, y mucha conflictividad en toda la región. Los monarcas de Jordania, Arabia Saudí, Marruecos e Irán fueron los únicos supervivientes de los cambios en las formas de Estado que se registraron en estos años».

Otros estudios

Además, este número 52 de la revista de la UGR cuenta con los estudios: «Acercamiento a la población de Churriana de la Vega (Granada) a través de su primer libro sacramental», de María José Collado Ruiz; «Fuentes andalusíes en el Kitab ‘umdat al-tabib de Abú l-Jayr al-Isbili: problemas en su identificación», de Mariam Gracia Mechbal; «Los límites entre la semántica y la pragmática según la teoría del esquema básico de la referencia», de Abeer Hussein Abid; «Cartas y noticias de ambos lados del estrecho: el universo jatibiano a través de la Nufadat al-yirab», de Laila Miriam Jreis Navarro; «Los Hada’iq al-azahir de Abu Bakr Ibn ‘Asim al-Garnati: una obra humorística en la Granada Nazarí», de Desirée López Bernal; «De Ibn Jaldún al reconocimiento del árabe marroquí como una lengua nativa viva y creativa», de Francisco Moscoso García; «La imagen poética de la mujer andalusí árabe y hebrea en el espacio privado», de Nadia Safi; «Abd Allah b. Buluqqin, semblanza y fin del último sultán Zirí a través de la Ihata de Ibn al-Jatib», de Bilal Sarr.

En su apartado de «Varios», la revista publica el trabajo «Existencialismo y anarquismo: dimensión política y fundamento filosófico. Traducción crítica de un artículo de Muhammad Sabila», de Juan A. Macías Amoretti; y «El Código bahreiní de estatuto personal», de Caridad Ruiz-Almodóvar.

Finalmente, la revista cuenta con sus habituales apartados de «Recensiones» y «Noticias». La revista «Miscelánea de Estudios Árabes y Hebraicos» (sección Árabe-Islám), de periodicidad anual, está dirigida por la profesora de la UGR Celia del Moral Molina, y tiene su Redacción en el Área de Estudios Árabes e Islámicos de la Facultad de Filosofía y Letras de la Universidad de Granada.

http://www.ugr.es/~estsemi/miscelanea_a.html

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Los encuentros de Franco con los líderes árabes y musulmanes, objeto de estudio de una revista de la UGR

Escrito por

«El pasado no es suficiente: temáticas y conflictos en los encuentros de Franco con los líderes árabes y musulmanes» es el título del estudio publicado por la profesora de la Universidad Carlos III de Madrid, Matilde Eiroa San Francisco, en el volumen 62 de la revista «Miscelánea de Estudios Árabes y Hebraicos» (sección Árabe-Islam) de la Universidad de Granada. 

La autora analiza en su artículo la política exterior de España con el mundo araboislámico desde la perspectiva de los encuentros personales de Franco con los dirigentes de dicha región. Según la profesora Matilde Eiroa, «estas reuniones son indicadoras de las relaciones públicas internacionales y del grado de afinidad y apoyo recíproco que se ofrecen los Estados participantes. Los objetivos fueron variados, pero, sobre todo, sirvieron como herramienta propagandística de gran valor para la imagen del Régimen».

La acción exterior española se volcó, a partir de 1945, hacia nuevos Estados debido a la soledad del Régimen y a la necesidad de buscar nuevas uniones para derribar la potente muralla que Occidente había alzado frente a España. «Franco encontró en los árabes –afirma la investigadora de la Universidad Carlos III– a interlocutores aceptables y descubrió en la Historia y en su propia biografía argumentos lícitos para coordinar una campaña que le allanara el camino hacia el estrechamiento de lazos. Estos elementos, sumados a la coincidencia del final del régimen colonial, la voluntad árabe de tener una presencia internacional y el bloqueo diplomático efectuado a España, funcionaron como factores determinantes para la aproximación a esta región».

La dimensión araboislámica de la política exterior pudo proporcionar a España grandes oportunidades para tomar parte en decisiones internacionales de gran trascendencia. La coyuntura excepcional de esta relación con el gobierno más anticomunista de Europa obedece al temor de algunos países como Jordania, Arabia Saudí o Egipto de caer en el ámbito de la URSS. De hecho, en los años cincuenta coincidieron un conjunto de acontecimientos en el Próximo y Medio Oriente, que amenazaban con bascular la balanza del lado soviético. «El triunfo de Naser en Egipto y la creación de la República Árabe Unida precedieron a la revolución en Líbano, la instauración de la república en Irak, un golpe de estado en Argelia, y mucha conflictividad en toda la región. Los monarcas de Jordania, Arabia Saudí, Marruecos e Irán fueron los únicos supervivientes de los cambios en las formas de Estado que se registraron en estos años».

Otros estudios

Además, este número 52 de la revista de la UGR cuenta con los estudios: «Acercamiento a la población de Churriana de la Vega (Granada) a través de su primer libro sacramental», de María José Collado Ruiz; «Fuentes andalusíes en el Kitab ‘umdat al-tabib de Abú l-Jayr al-Isbili: problemas en su identificación», de Mariam Gracia Mechbal; «Los límites entre la semántica y la pragmática según la teoría del esquema básico de la referencia», de Abeer Hussein Abid; «Cartas y noticias de ambos lados del estrecho: el universo jatibiano a través de la Nufadat al-yirab», de Laila Miriam Jreis Navarro; «Los Hada’iq al-azahir de Abu Bakr Ibn ‘Asim al-Garnati: una obra humorística en la Granada Nazarí», de Desirée López Bernal; «De Ibn Jaldún al reconocimiento del árabe marroquí como una lengua nativa viva y creativa», de Francisco Moscoso García; «La imagen poética de la mujer andalusí árabe y hebrea en el espacio privado», de Nadia Safi; «Abd Allah b. Buluqqin, semblanza y fin del último sultán Zirí a través de la Ihata de Ibn al-Jatib», de Bilal Sarr.

En su apartado de «Varios», la revista publica el trabajo «Existencialismo y anarquismo: dimensión política y fundamento filosófico. Traducción crítica de un artículo de Muhammad Sabila», de Juan A. Macías Amoretti; y «El Código bahreiní de estatuto personal», de Caridad Ruiz-Almodóvar.

Finalmente, la revista cuenta con sus habituales apartados de «Recensiones» y «Noticias». La revista «Miscelánea de Estudios Árabes y Hebraicos» (sección Árabe-Islám), de periodicidad anual, está dirigida por la profesora de la UGR Celia del Moral Molina, y tiene su Redacción en el Área de Estudios Árabes e Islámicos de la Facultad de Filosofía y Letras de la Universidad de Granada.

http://www.ugr.es/~estsemi/miscelanea_a.html

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Study hints at age of Antarctic polar ice cap

Escrito por

64519 London: According to a recent study, the Antarctic continental ice cap came into existence some 33.6 million years ago.
The postulate was made following an expedition led by the Andalusian Institute of Earth Sciences (IACT) – a Spanish National Research Council-University of Granada joint centre. 

Before the ice covered Antarctica, Earth was a warm place with a tropical climate. In this region, plankton diversity was high until glaciation reduced the populations leaving only those capable of surviving in the new climate. 

The Integrated Ocean Drilling Programme international expedition obtained this information from the paleoclimatic history preserved in sediment strata in the Antarctic depths. 

«The fossil record of dinoflagellate cyst communities reflects the substantial reduction and specialisation of these species that took place when the ice cap became established and, with it, marked seasonal ice-pack formation and melting began,» said Carlota Escutia, IACT researcher who led the expedition. 

The study was published in the journal, Science.
Descargar

Study hints at age of Antarctic polar ice cap

Escrito por

64519 London: According to a recent study, the Antarctic continental ice cap came into existence some 33.6 million years ago.
The postulate was made following an expedition led by the Andalusian Institute of Earth Sciences (IACT) – a Spanish National Research Council-University of Granada joint centre. 

Before the ice covered Antarctica, Earth was a warm place with a tropical climate. In this region, plankton diversity was high until glaciation reduced the populations leaving only those capable of surviving in the new climate. 

The Integrated Ocean Drilling Programme international expedition obtained this information from the paleoclimatic history preserved in sediment strata in the Antarctic depths. 

«The fossil record of dinoflagellate cyst communities reflects the substantial reduction and specialisation of these species that took place when the ice cap became established and, with it, marked seasonal ice-pack formation and melting began,» said Carlota Escutia, IACT researcher who led the expedition. 

The study was published in the journal, Science.
Descargar

Antarctic polar ice cap is 33.6 million years old

Escrito por

64519 he Antarctic continental ice cap came into existence some 33.6 million years ago, according to new data from an international expedition.

The expedition was led by the Andalusian Institute of Earth Sciences (IACT) – a Spanish National Research Council-University of Granada joint centre.

Before the ice covered Antarctica, Earth was a warm place with a tropical climate. In this region, plankton diversity was high until glaciation reduced the populations leaving only those capable of surviving in the new climate.

The Integrated Ocean Drilling Programme international expedition obtained this information from the paleoclimatic history preserved in sediment strata in the Antarctic depths.

«The fossil record of dinoflagellate cyst communities reflects the substantial reduction and specialisation of these species that took place when the ice cap became established and, with it, marked seasonal ice-pack formation and melting began,» said Carlota Escutia, IACT researcher who led the expedition.

The appearance of the Antarctic polar icecap marks the beginning of plankton communities that are still functioning today.

This ice-cap is associated with the ice-pack, the frozen part that disappears and reappears as a function of seasonal climate changes.

When the ice-pack melts as the Antarctic summer approaches, this marks the increase in primary productivity of endemic plankton communities, researchers found.

When it melts, the ice frees the nutrients it has accumulated and these are used by the plankton. Escutia said «this phenomenon influences the dynamics of global primary productivity.»

Since ice first expanded across Antarctica and caused the dinoflagellate communities to specialise, these species have been undergoing constant change and evolution.

However, Escutia believes «the great change came when the species simplified their form and found they were forced to adapt to the new climatic conditions.»

Pre-glaciation sediment contained highly varied dinoflagellate communities, with star-shaped morphologies.

When the ice appeared 33.6 million years ago, this diversity was limited and their activity subjected to the new seasonal climate.
The study was published in the journal Science.

Descargar

Antarctic polar ice cap is 33.6 million years old

Escrito por

64519 he Antarctic continental ice cap came into existence some 33.6 million years ago, according to new data from an international expedition.

The expedition was led by the Andalusian Institute of Earth Sciences (IACT) – a Spanish National Research Council-University of Granada joint centre.

Before the ice covered Antarctica, Earth was a warm place with a tropical climate. In this region, plankton diversity was high until glaciation reduced the populations leaving only those capable of surviving in the new climate.

The Integrated Ocean Drilling Programme international expedition obtained this information from the paleoclimatic history preserved in sediment strata in the Antarctic depths.

«The fossil record of dinoflagellate cyst communities reflects the substantial reduction and specialisation of these species that took place when the ice cap became established and, with it, marked seasonal ice-pack formation and melting began,» said Carlota Escutia, IACT researcher who led the expedition.

The appearance of the Antarctic polar icecap marks the beginning of plankton communities that are still functioning today.

This ice-cap is associated with the ice-pack, the frozen part that disappears and reappears as a function of seasonal climate changes.

When the ice-pack melts as the Antarctic summer approaches, this marks the increase in primary productivity of endemic plankton communities, researchers found.

When it melts, the ice frees the nutrients it has accumulated and these are used by the plankton. Escutia said «this phenomenon influences the dynamics of global primary productivity.»

Since ice first expanded across Antarctica and caused the dinoflagellate communities to specialise, these species have been undergoing constant change and evolution.

However, Escutia believes «the great change came when the species simplified their form and found they were forced to adapt to the new climatic conditions.»

Pre-glaciation sediment contained highly varied dinoflagellate communities, with star-shaped morphologies.

When the ice appeared 33.6 million years ago, this diversity was limited and their activity subjected to the new seasonal climate.
The study was published in the journal Science.

Descargar