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Evidence for coal forest refugia in the seasonally dry Pennsylvanian tropical lowlands of the Illinois Basin, USA.
PeerJ 2014; 2:e630P

Abstract

The Moscovian plant macroflora at Cottage Grove southeastern Illinois, USA, is a key example of Pennsylvanian (323-299 Million years ago) dryland vegetation. There is currently no palynological data from the same stratigraphic horizons as the plant macrofossils, leaves and other vegetative and reproductive structures, at this locality. Consequently, reconstructions of the standing vegetation at Cottage Grove from these sediments lack the complementary information and a more regional perspective that can be provided by sporomorphs (prepollen, pollen, megaspores and spores). In order to provide this, we have analysed the composition of fossil sporomorph assemblages in two rock samples taken from macrofossil-bearing inter-coal shale at Cottage Grove. Our palynological data differ considerably in composition and in the dominance-diversity profile from the macrofossil vegetation at this locality. Walchian conifers and pteridosperms are common elements in the macroflora, but are absent in the sporomorph assemblages. Reversely, the sporomorph assemblages at Cottage Grove comprise 17 spore taxa (∼16% and ∼63% of the total assemblages) that are known from the lycopsid orders Isoetales, Lepidodendrales and Selaginallales, while Cottage Grove's macrofloral record fails to capture evidence of a considerable population of coal forest lycopsids. We interpret our results as evidence that the Pennsylvanian dryland glacial landscape at Cottage Grove included fragmented populations of wetland plants living in refugia.

Authors+Show Affiliations

Department of Integrative Biology and Museum of Paleontology, University of California , Berkeley, CA , USA.Department of Integrative Biology, University of California , Berkeley, CA , USA.TNO-Geobiology , Utrecht , The Netherlands.College of Life and Environmental Sciences, University of Exeter , Exeter, Devon , UK.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

25392752

Citation

Looy, Cindy V., et al. "Evidence for Coal Forest Refugia in the Seasonally Dry Pennsylvanian Tropical Lowlands of the Illinois Basin, USA." PeerJ, vol. 2, 2014, pp. e630.
Looy CV, Stevenson RA, Van Hoof TB, et al. Evidence for coal forest refugia in the seasonally dry Pennsylvanian tropical lowlands of the Illinois Basin, USA. PeerJ. 2014;2:e630.
Looy, C. V., Stevenson, R. A., Van Hoof, T. B., & Mander, L. (2014). Evidence for coal forest refugia in the seasonally dry Pennsylvanian tropical lowlands of the Illinois Basin, USA. PeerJ, 2, pp. e630. doi:10.7717/peerj.630.
Looy CV, et al. Evidence for Coal Forest Refugia in the Seasonally Dry Pennsylvanian Tropical Lowlands of the Illinois Basin, USA. PeerJ. 2014;2:e630. PubMed PMID: 25392752.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Evidence for coal forest refugia in the seasonally dry Pennsylvanian tropical lowlands of the Illinois Basin, USA. AU - Looy,Cindy V, AU - Stevenson,Robert A, AU - Van Hoof,Thomas B, AU - Mander,Luke, Y1 - 2014/11/04/ PY - 2014/09/16/received PY - 2014/09/30/accepted PY - 2014/11/14/entrez PY - 2014/11/14/pubmed PY - 2014/11/14/medline KW - Paleoecology KW - Pennsylvanian KW - Refugia KW - Vegetation reconstruction SP - e630 EP - e630 JF - PeerJ JO - PeerJ VL - 2 N2 - The Moscovian plant macroflora at Cottage Grove southeastern Illinois, USA, is a key example of Pennsylvanian (323-299 Million years ago) dryland vegetation. There is currently no palynological data from the same stratigraphic horizons as the plant macrofossils, leaves and other vegetative and reproductive structures, at this locality. Consequently, reconstructions of the standing vegetation at Cottage Grove from these sediments lack the complementary information and a more regional perspective that can be provided by sporomorphs (prepollen, pollen, megaspores and spores). In order to provide this, we have analysed the composition of fossil sporomorph assemblages in two rock samples taken from macrofossil-bearing inter-coal shale at Cottage Grove. Our palynological data differ considerably in composition and in the dominance-diversity profile from the macrofossil vegetation at this locality. Walchian conifers and pteridosperms are common elements in the macroflora, but are absent in the sporomorph assemblages. Reversely, the sporomorph assemblages at Cottage Grove comprise 17 spore taxa (∼16% and ∼63% of the total assemblages) that are known from the lycopsid orders Isoetales, Lepidodendrales and Selaginallales, while Cottage Grove's macrofloral record fails to capture evidence of a considerable population of coal forest lycopsids. We interpret our results as evidence that the Pennsylvanian dryland glacial landscape at Cottage Grove included fragmented populations of wetland plants living in refugia. SN - 2167-8359 UR - https://www.unboundmedicine.com/medline/citation/25392752/Evidence_for_coal_forest_refugia_in_the_seasonally_dry_Pennsylvanian_tropical_lowlands_of_the_Illinois_Basin,_USA L2 - https://doi.org/10.7717/peerj.630 DB - PRIME DP - Unbound Medicine ER -