來自 Hong Kong
I lost some of my paper when my labtop was broken. But this two papers along with the paper I shared before are the most important one. |
A major contribution of Cambrian Radiation is due to oxygen level increase in the ocean during "Snowball Earth" period because of low oxygen consumption in the community, higher oxygen solubility, and ice sheet preventing oceanic oxygen escaping to the atmosphere. As a result, higher oxygen concentration allow higher energy foraging activity such as active predation when the climate was warming right after snowball earth period. Predation also trigger creation of armoue and other animal defense strategy in turns to promote radiation when opportunity available. That is the reason why the first evidence of predation and hard tissue such as armour only appear after cambrian radiation because both predation and building hard structure is energy expensive and it does not make sense to use that amount of energy when organism metabolism was low before cambrian explosion. It is worth to note that not all animal phyla appear at the cambrian radiation. Some phyla may appear earlier such as cnidarian, nematode and possibly mollusk which may date back in ediacaran period or even possibly a billion years ago for nematode. Some phyla may appear after cambrian such as bryozoa (Ordovician) and I remember there was a phylum appear in Jurassic period (I am not quite sure if it is tardigrade, water bear or something else).
[ 本帖最後由 Dinosaurprince 於 2017-1-8 11:42 AM 編輯 ]
Curr Biol 2014 Ghisalberti.pdf (2017-1-8 11:42 AM, 893.28 K)
Parfrey_Lahr_multicellularity_2013.pdf (2017-1-8 11:42 AM, 314.84 K)