Abstract
The Niobrara River Valley of northern Nebraska contains numerous bryophyte, vascular plant, and animal species more typical of forests far to the east, north, and west than to other forests in the grasslands that surround the Valley. Some species are probably relicts of cooler glacial and early postglacial times, when much of what is now grassland was covered by boreal and cool-temperate forests. Others entered the Valley from the east in postglacial times, and some entered from the west as the climate became semi-arid. There is a steep decline in total number of vascular plant species from the mouth of the Missouri River up through the Niobrara Valley, suggesting an environmental gradient and differential migration and extirpation of species at various times since the Pleistocene.
Abstraktum
Das Niobrara Flusstal nördliches Nebraska enthält viele Laubmoose, Gefässpflanzen, und Tiere Arten, die mehr typisch für ostliche, nördliche, und westliche Wälder sind, als andere Wälder auf der umgebenden Wiesen. Manche Arten sind vielleicht Hinterbliebene von kühleren vergletscherten und frühe nach vergletscheten Zeiten. Andere eintraten ins Tal von Osten während nachvergletscherten Zeiten, und manche eintraten von Westen, während das Klima halb dürr wurde. Es gibt eine steile Neige in die Summe Gefässpflanzenarten von der Mündung des Missouri Fluss bis dem Niobrara Tal, die eine Umgebungsteigung und Unterscheidungswanderung und Ausrottung Arten um verschiedene Zeiten seitdem Pleistozän vorschlagen.
Resumen
El Valle del Rio Niobrara, en el norte de Nebraska, contiene un gran número de especies de briofitas, plantas vasculares, y animales que son tipicos de los bosques del este, norte, y oeste de Estado Unidos que de las praderas que rodean al Valle. Alqunas de estas son probablemente vestigios de peridos frios de glaciación y tempranos eventos pos-glaciales, cuando gran parte de lo que es hoy pradera estaba cubierto por bosques boreales y templados. Otras especies entraron al Valle del este en el periodo pos-glacial, y otras entraron del oeste segun el clima se torno semiárido. Hay un alto declive en el número total de plantas vasculares desde le boca del Rio Missouri atravesando el Valle Niobrara, sugiriendo un gradiente ambiental, migración diferencial y extirpación de especies en varias épocas desde el Pleistoceno.
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Kaul, R.B., Kantak, G.E. & Churchill, S.P. The Niobrara River Valley, a postglacial migration corridor and refugium of forest plants and animals in the grasslands of central North America. Bot. Rev 54, 44–81 (1988). https://doi.org/10.1007/BF02858518
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DOI: https://doi.org/10.1007/BF02858518