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Cambrian explosion triggered by geosphere‐biosphere feedbacks
Author(s) -
von Bloh Werner,
Bounama Christine,
Franck Siegfried
Publication year - 2003
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2003gl017928
Subject(s) - multicellular organism , biosphere , weathering , astrobiology , earth science , geology , carbon cycle , paleozoic , earth (classical element) , extraterrestrial life , abiogenesis , environmental science , paleontology , ecology , biology , ecosystem , biochemistry , physics , gene , mathematical physics
A new hypothesis for the cause of the Cambrian explosion is presented. For that the evolution of the planet Earth is described by the co‐evolution of the geosphere‐biosphere system. Here we specify our previously published Earth system model for the long‐term carbon cycle by introducing three different types of biosphere: procaryotes, eucaryotes, and complex multicellular life. They are characterized by different global temperature tolerance windows. The biotic enhancement of silicate weathering by complex multicellular life adds an additional feedback to the system and triggers the Cambrian explosion. The Cambrian explosion is characterized by a sudden increase of biomass and a rapid cooling, which amplified the spread of complex multicellular life. Cooling events in the Neoproterozoic, however, could force a premature appearance of complex multicellular life.