Ancient atmospheric CO2 and the timing of evolution of secondary endosymbioses

Autor:	Paul Kugrens, Robert Edward Lee
Rok vydání:	2000
Předmět:	Chloroplast Paleozoic Permian Algae biology Ecology Pennsylvanian Dissolved organic carbon Plant Science Aquatic Science Plastid Photosynthesis biology.organism_classification
Zdroj:	Phycologia. 39:167-172
ISSN:	2330-2968 0031-8884
DOI:	10.2216/i0031-8884-39-2-167.1
Popis:	We postulate that the evolutionary success of those diverse algal groups characterized by secondary endosymbiotic origin of plastids was directly connected to changing atmospheric CO2 in the late Palaeozoic. Atmospheric CO2 levels were reduced to historic lows, probably lower than today's atmosphere, during the Pennsylvanian and Permian periods. This most likely resulted in dissolved inorganic carbon (DIC) becoming the limiting factor in photosynthesis in these ancient oceans. Fossil and molecular data suggest that a number of algal groups with secondary endosymbioses evolved between 260 and 285 Ma during the minimum in atmospheric CO2. It has been hypothesized that these algae were able to more efficiently utilize DIC because their chloroplasts were contained within an acidic compartment where DIC was largely in the form of CO2. In this paper we postulate that secondary endosymbioses arose continuously from the time of evolution of the chloroplast (about 2000 Ma). However, these secondary endosy...
Databáze:	OpenAIRE
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