Browsing by Subject "EVOLUTION"
Now showing items 1-20 of 29
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A baseline paleoecological study for the Santa Cruz Formation (late–early Miocene) at the Atlantic coast of Patagonia, Argentina
(Palaeogeography, Palaeoclimatology, Palaeoecology, 2010-06)Coastal exposures of the Santa Cruz Formation (late-early Miocene, southern Patagonia, Argentina) between the Coyle and Gallegos rivers have been a fertile ground for recovery of Miocene vertebrates for more than 100 years. ... -
A classification for extant ferns
(Taxon, 2006-01-01)We present a revised classification for extant ferns, with emphasis on ordinal and familial ranks, and a synopsis of included genera. Our classification reflects recently published phylogenetic hypotheses based ... -
A molecular phylogeny of scaly tree ferns (Cyatheaceae).
(American journal of botany, 2007-05)Tree ferns recently were identified as the closest sister group to the hyperdiverse clade of ferns, the polypods. Although most of the 600 species of tree ferns are arborescent, the group encompasses a wide range of morphological ... -
A plastid phylogeny of the cosmopolitan fern family cystopteridaceae (Polypodiopsida)
(Systematic Botany, 2013-06-01)Among the novel results of recent molecular phylogenetic analyses are the unexpectedly close evolutionary relationships of the genera Acystopteris, Cystopteris, and Gymnocarpium, and the phylogenetic isolation of these genera ... -
A revised generic classification of vittarioid ferns (Pteridaceae) based on molecular, micromorphological, and geographic data
(Taxon, 2016-08-01)© International Association for Plant Taxonomy (IAPT) 2016. Vittarioid ferns compose a well-supported clade of 100-130 species of highly simplified epiphytes in the family Pteridaceae. Generic circumscriptions within the ... -
Assessing phylogenetic relationships in extant heterosporous ferns (Salviniales), with a focus on Pilularia and Salvinia
(Botanical Journal of the Linnean Society, 2008-08-01)Heterosporous ferns (Salviniales) are a group of approximately 70 species that produce two types of spores (megaspores and microspores). Earlier broad-scale phylogenetic studies on the order typically focused on one or, ... -
Associations Between Nutrition, Gut Microbiome, and Health in A Novel Nonhuman Primate Model.
(Scientific reports, 2018-07-24)Red-shanked doucs (Pygathrix nemaeus) are endangered, foregut-fermenting colobine primates which are difficult to maintain in captivity. There are critical gaps in our understanding of their natural lifestyle, including ... -
Boom and Bust: The Effect of Entrepreneurial Inertia on Organizational Populations
(Advances in Strategic Management, 2006)Although recent public attention has focused on boom-and-bust cycles in industries and financial markets, organizational theorists have made only limited contributions to our understanding of this issue. In this chapter, ... -
Comparative morphology of reproductive structures in heterosporous water ferns and a reevaluation of the sporocarp
(International Journal of Plant Sciences, 2006-07-01)Heterosporous water ferns (Marsileaceae and Salviniaceae) are the only extant group of plants to have evolved heterospory since the Paleozoic. These ferns possess unusual reproductive structures traditionally termed "sporocarps." ... -
Credit and Classification: The Impact of Industry Boundaries in 19th Century America
(Administrative Science Quarterly, 2009)In this article, we examine how issues of multi-category membership (hybridity) were handled during the evolution of one of the first general systems of industrial classification in the United States, the credit rating schema ... -
Deciphering the origins of apomictic polyploids in the Cheilanthes yavapensis complex (Pteridaceae).
(American journal of botany, 2009-09)Deciphering species relationships and hybrid origins in polyploid agamic species complexes is notoriously difficult. In this study of cheilanthoid ferns, we demonstrate increased resolving power for clarifying the origins ... -
Designing a network of critical zone observatories to explore the living skin of the terrestrial Earth
(Earth Surface Dynamics, 2017-12-18)The critical zone (CZ), the dynamic living skin of the Earth, extends from the top of the vegetative canopy through the soil and down to fresh bedrock and the bottom of the groundwater. All humans live in and depend on the ... -
DNA barcoding exposes a case of mistaken identity in the fern horticultural trade.
(Molecular ecology resources, 2010-11)Using cheilanthoid ferns, we provide an example of how DNA barcoding approaches can be useful to the horticultural community for keeping plants in the trade accurately identified. We use plastid rbcL, atpA, and trnG-R sequence ... -
Hydro-geomorphic perturbations on the soil-atmosphere CO2exchange: How (un)certain are our balances?
(Water Resources Research, 2017-02) -
Isozymic and Chromosomal Evidence for the Allotetraploid Origin of Gymnocarpium dryopteris (Dryopteridaceae)
(Systematic Botany, 1993-01) -
Modifications of 2:1 clay minerals in a kaolinite-dominated Ultisol under changing land-use regimes
(Clays and Clay Minerals, 2018-02-01)© 2018, Clay Minerals Society. All rights reserved. Chemical denudation and chemical weathering rates vary under climatic, bedrock, biotic, and topographic conditions. Constraints for landscape evolution models must consider ... -
Origins of the endemic scaly tree ferns on the galápagos and Cocos Islands
(International Journal of Plant Sciences, 2015-11-01)© 2015 by The University of Chicago. All rights reserved. Premise of research. Successful long-distance dispersal is rarely observed in scaly tree ferns (Cyatheaceae). Nevertheless, recent molecular evidence has suggested ... -
Patterns of diversification in the xeric-adapted fern genus myriopteris (Pteridaceae)
(Systematic Botany, 2014-01-01)Strong selective pressures imposed by drought-prone habitats have contributed to extensive morphological convergence among the 400 + species of cheilanthoid ferns (Pteridaceae). As a result, generic circumscriptions based ... -
Phylogenetic Relationships of Extant Ferns Based on Evidence from Morphology and rbcL Sequences
(American Fern Journal, 1995-10) -
Phylogeny and relationships of the neotropical Adiantum raddianum group (Pteridaceae)
(Taxon, 2016-12-01)© International Association for Plant Taxonomy (IAPT) 2016. With more than 200 species, the maidenhair fern genus Adiantum is among the top ten most diverse fern genera. Adiantum is pantropical in distribution and, due to ...
