Biological Feedbacks as Cause and Demise of Neoproterozoic Icehouse: Astrobiological Prospects for Faster Evolution and Importance of Cold Conditions
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{"title"=>"Biological feedbacks as cause and demise of neoproterozoic icehouse: Astrobiological prospects for faster evolution and importance of cold conditions", "type"=>"journal", "authors"=>[{"first_name"=>"Pekka", "last_name"=>"Janhunen", "scopus_author_id"=>"13611296200"}, {"first_name"=>"Hermanni", "last_name"=>"Kaartokallio", "scopus_author_id"=>"6506770627"}, {"first_name"=>"Ilona", "last_name"=>"Oksanen", "scopus_author_id"=>"56176617900"}, {"first_name"=>"Kirsi", "last_name"=>"Lehto", "scopus_author_id"=>"7004040123"}, {"first_name"=>"Harry", "last_name"=>"Lehto", "scopus_author_id"=>"7003557802"}], "year"=>2007, "source"=>"PLoS ONE", "identifiers"=>{"pui"=>"352579766", "pmid"=>"17299594", "isbn"=>"19326203 (ISSN)", "issn"=>"19326203", "doi"=>"10.1371/journal.pone.0000214", "scopus"=>"2-s2.0-46149085334", "sgr"=>"46149085334"}, "id"=>"9f7470c3-bda2-38e6-b946-02a63c0eab0f", "abstract"=>"Several severe glaciations occurred during the Neoproterozoic eon, and especially near its end in the Cryogenian period (630-850 Ma). While the glacial periods themselves were probably related to the continental positions being appropriate for glaciation, the general coldness of the Neoproterozoic and Cryogenian as a whole lacks specific explanation. The Cryogenian was immediately followed by the Ediacaran biota and Cambrian Metazoan, thus understanding the climate-biosphere interactions around the Cryogenian period is central to understanding the development of complex multicellular life in general. Here we present a feedback mechanism between growth of eukaryotic algal phytoplankton and climate which explains how the Earth system gradually entered the Cryogenian icehouse from the warm Mesoproterozoic greenhouse. The more abrupt termination of the Cryogenian is explained by the increase in gaseous carbon release caused by the more complex planktonic and benthic foodwebs and enhanced by a diversification of metazoan zooplankton and benthic animals. The increased ecosystem complexity caused a decrease in organic carbon burial rate, breaking the algal-climatic feedback loop of the earlier Neoproterozoic eon. Prior to the Neoproterozoic eon, eukaryotic evolution took place in a slow timescale regulated by interior cooling of the Earth and solar brightening. Evolution could have proceeded faster had these geophysical processes been faster. Thus, complex life could theoretically also be found around stars that are more massive than the Sun and have main sequence life shorter than 10 Ga. We also suggest that snow and glaciers are, in a statistical sense, important markers for conditions that may possibly promote the development of complex life on extrasolar planets.", "link"=>"http://www.mendeley.com/research/biological-feedbacks-cause-demise-neoproterozoic-icehouse-astrobiological-prospects-faster-evolution", "reader_count"=>21, "reader_count_by_academic_status"=>{"Professor > Associate Professor"=>2, "Researcher"=>5, "Student > Ph. D. Student"=>6, "Student > Postgraduate"=>2, "Other"=>1, "Student > Master"=>2, "Student > Bachelor"=>1, "Professor"=>2}, "reader_count_by_user_role"=>{"Professor > Associate Professor"=>2, "Researcher"=>5, "Student > Ph. D. Student"=>6, "Student > Postgraduate"=>2, "Other"=>1, "Student > Master"=>2, "Student > Bachelor"=>1, "Professor"=>2}, "reader_count_by_subject_area"=>{"Environmental Science"=>1, "Biochemistry, Genetics and Molecular Biology"=>3, "Mathematics"=>1, "Agricultural and Biological Sciences"=>7, "Arts and Humanities"=>1, "Chemistry"=>1, "Computer Science"=>1, "Earth and Planetary Sciences"=>6}, "reader_count_by_subdiscipline"=>{"Chemistry"=>{"Chemistry"=>1}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>6}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>7}, "Computer Science"=>{"Computer Science"=>1}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>3}, "Mathematics"=>{"Mathematics"=>1}, "Environmental Science"=>{"Environmental Science"=>1}, "Arts and Humanities"=>{"Arts and Humanities"=>1}}, "reader_count_by_country"=>{"United States"=>2, "United Kingdom"=>1, "Mexico"=>1, "Spain"=>1}, "group_count"=>0}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/953031"], "description"=>"<p>(a) Line: Deviation of δ<sup>13</sup>C/<sup>12</sup>C ratio from its standard Peedee belemnite (PDB) value in marine carbonate sediments. Adapted from <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0000214#pone.0000214-Bartley1\" target=\"_blank\">[10]</a>. Shadings show glacial periods: light shading means any geologic evidence of glaciation and darker shading means severe (global?) ice age. (b) Acritarch diversity; most acritarchs likely represent unicellular phytoplankton groups. (c) The evolutionary rate of acritarchs. Number of first apperance (solid) and last appearance (dotted) species per Myrs per species. Source for b and c is <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0000214#pone.0000214-Knoll2\" target=\"_blank\">[30]</a>.</p>", "links"=>[], "tags"=>["evolutionary biology/evolutionary ecology", "evolutionary biology/paleontology", "physics/geophysics, astronomy, and astrophysics"], "article_id"=>623341, "categories"=>["Evolutionary Biology", "Astronomy, Astrophysics, Space Science"], "users"=>["Pekka Janhunen", "Hermanni Kaartokallio", "Ilona Oksanen", "Kirsi Lehto", "Harry Lehto"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0000214.g001", "stats"=>{"downloads"=>1, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Figure_1_/623341", "title"=>"Figure 1", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-21 12:49:23"}

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Relative Metric

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