Project 1097: Blank CE. 2013. Origin and early evolution of photosynthetic eukaryotes in freshwater environments – reinterpreting proterozoic paleobiology and biogeochemical processes in light of trait evolution. Journal of Phycology. 49 (6):1040-1055.
Specimen: Cylindrospermum (unvouchered)

Abstract

Phylogenetic analyses were performed on concatenated datasets of 31 genes and 11,789 unambiguously alignable characters from 37 cyanobacterial and 35 chloroplast genomes. The plastid lineage emerged somewhat early in the cyanobacterial tree, at a time when Cyanobacteria were likely unicellular and restricted to freshwater ecosystems. Using relaxed molecular clocks and 22 age constraints spanning cyanobacterial and eukaryote nodes, the common ancestor to the photosynthetic eukayotes was predicted to have also inhabited freshwater environments around the time that oxygen appeared in the atmosphere (2.0-2.3 Ga). Early diversifications within each of the three major plastid clades were also inferred to have occurred in freshwater environments, through the late Paleoproterozoic and into the middle Mesoproterozoic. The colonization of marine environments by photosynthetic eukaryotes may not have occurred until after middle Mesoproterozoic (1.2-1.5 Ga). The evolutionary hypotheses proposed here predict that early photosynthetic eukaryotes may have never experienced the widespread anoxia or euxinia suggested to have characterized marine environments in the Paleoproterozoic to early Mesoproterozoic. It also proposes that earliest acritarchs (1.5-1.7 Ga) may have been produced by freshwater taxa. This study highlights how the early evolution of habitat preference in photosynthetic eukaryotes, along with Cyanobacteria, could have contributed to changing biogeochemical conditions on the early Earth.

This Project has a time tree, and a character matrix, in the form of a nexus/Mesquite file. This file can be downloaded under the Documents tab.



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Project DOI: 10.7934/P1097, http://dx.doi.org/10.7934/P1097
This project containsMatrices
  • 3 Media
  • 1 Matrix
  • 1 Document
  • 67 Taxa
  • 1 Specimen
  • 1 Character
Total size of project's media files: 2 MB

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Total scored cells: 71
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 1
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 4
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:0/1
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MorphoBank Project 1097

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    Carrine Blank
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    Taxonomic Overview for Matrix 'M2412' (66 Taxa)

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    [1] Acaryochloris marina mbic11017
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    01100003
    [2] Anabaena variabilis atcc29413
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    [3] Aneura mirabilis
    Last Modified in 12/17/13
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    [4] Angiopteris evecta
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    [5] Anthoceros formosae
    Last Modified in 12/17/13
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    [6] Arthrospira maxima cs-328
    Last Modified in 12/17/13
    10000003
    [7] Chara vulgaris
    Last Modified in 12/17/13
    03100003
    [8] Chlamydomonas reinhardtii
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    [9] Chlorokybus atmophyticus
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    [10] Crocosphaera watsonii wh8501
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    [11] Cyanidioschyzon merolae strain 10d
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    [12] Cyanidium caldarium
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    [13] Cyanobium sp. pcc7001
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    [14] Cyanophora paradoxa
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    [15] Cycas taitungensis
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    [16] Gloeobacter violaceus pcc7421
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    [17] Gracilaria tenuistipitata var. liui
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    [18] Heterosigma akashiwo
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    [19] Lyngbya sp. pcc8106
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    [20] Marchantia polymorpha
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    [21] Mesostigma viride
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    [22] Micromonas sp. rcc299
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    [23] Monomastix sp. oke-1
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    [24] Nodularia spumigena ccy9414
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    [25] Nostoc punctiforme pcc73102
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    [26] Nostoc sp. pcc7120
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    [27] Odontella sinensis
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    [28] Oedogonium cardiacum
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    [29] Oltmannsiellopsis viridis
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    [30] Ostreococcus tauri
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    [31] Phaeodactylum tricornutum
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    [32] Physcomitrella patens patens
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    [33] Pinus contorta
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    [34] Porphyra purpurea
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    [35] Porphyra yezoensis
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    [36] Prochlorococcus marinus mit9211
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    [37] Prochlorococcus marinus mit9312
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    [38] Prochlorococcus marinus mit9313
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    [39] Prochlorococcus marinus natl2a
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    [40] Prochlorococcus marinus ccmp1375
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    [41] Prochlorococcus marinus ccmp1986
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    [42] Pseudendoclonium akinetum
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    [43] Psilotum nudum
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    [44] Pyramimonas parkeae
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    [45] Ranunculus macranthus
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    [46] Scenedesmus obliquus
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    [47] Sorghum bicolor
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    [48] Spinacia oleracea
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    [49] Staurastrum punctulatum
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    [50] Stigeoclonium helveticum
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    [51] Synechococcus sp. cc9311
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    [52] Synechococcus sp. ja-2-3b'a(2-13)
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    [53] Synechococcus sp. ja-3-3ab
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    [54] Synechococcus.sp.PCC7002
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    [55] Synechococcus.sp.RS9916
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    [56] Synechococcus.sp.WH5701
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    [57] Synechococcus.sp.WH7803
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    [58] Synechococcus.sp.WH7805
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    [59] Synechococcus.sp.WH8102
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    [60] Synechocystis sp. pcc6803
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    [61] Syntrichia ruralis
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    [62] Thalassiosira pseudonana
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    [63] Thermosynechococcus elongatus bp-1
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    [64] Trichodesmium erythraeum ims101
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    [65] Vaucheria litorea
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    [66] Zygnema circumcarinatum
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