Tag Archives: datenbank aquaMaps

Die Wiege der Fische

By Nature, , , , ,

Kalte Ozeane bringen doppelt so schnell neue Arten hervor wie tropische Meere

Die Freiburger Biologin Dr. Kristin Kaschner, der Evolutionsbiologe Dr. Daniel Rabosky von der University of Michigan/USA und die Biologin Cristina Garilao vom Geomar – Helmholtz-Zentrum für Ozeanforschung Kiel haben zusammen mit einem internationalen Forschungsteam in einer Studie die evolutionäre Beziehung von mehr als 30.000 Fischarten analysiert. (more…)

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Lack of oxygen delayed the appearance of animals on Earth

By Environment, , , , , , , , , , , , , , , , , , ,

Geologists are letting the air out of a nagging mystery about the development of animal life on Earth.

Scientists have long speculated as to why animal species didn’t flourish sooner, once sufficient oxygen covered the Earth’s surface. Animals began to prosper at the end of the Proterozoic period, about 800 million years ago — but what about the billion-year stretch before that, when most researchers think there also was plenty of oxygen? (more…)

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