Proceedings of the Biological Society of Washington 7
Proceedings of the Biological Society of Washington 7
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Sot., \V\8H., Vol.. VII, 1W>2.
Digitized by Google 58 Merriam — Geographic Distribution of Life.
In a communication already referred to (North American Fauna, No. 3, September, 1890) I stated the conclusion that the commonly accepted division of the United States into Eastern, Middle, and Western Provinces had no existence in nature, and that " the whole of extratropical North America [the Nearctic region of Sclater and Wallace] consists of but two primary life regions, a Boreal region, which i...s circumpolar ; and a Sonoran or Mexican Table-land region which is unique." The so-called East- ern Province is mainly of Sonoran derivation, comprising the humid divisions of the Lower Sonoran and Upper Sonoran Zones (Austroriparian and Carolinian faunas), and of the Transition or Neutral Belt commonly known among ornithologists as the Allcghanian fauna. It contains also a southward extension of the Boreal Region along the Appalachian mountain system — mainly in the form of isolated islands.
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To quickly assess the difficulty of the text, read a short excerpt:
Sot., \V\8H., Vol.. VII, 1W>2.
Digitized by Google 58 Merriam — Geographic Distribution of Life.
In a communication already referred to (North American Fauna, No. 3, September, 1890) I stated the conclusion that the commonly accepted division of the United States into Eastern, Middle, and Western Provinces had no existence in nature, and that " the whole of extratropical North America [the Nearctic region of Sclater and Wallace] consists of but two primary life regions, a Boreal region, which i...s circumpolar ; and a Sonoran or Mexican Table-land region which is unique." The so-called East- ern Province is mainly of Sonoran derivation, comprising the humid divisions of the Lower Sonoran and Upper Sonoran Zones (Austroriparian and Carolinian faunas), and of the Transition or Neutral Belt commonly known among ornithologists as the Allcghanian fauna. It contains also a southward extension of the Boreal Region along the Appalachian mountain system — mainly in the form of isolated islands.
What to read after Proceedings of the Biological Society of Washington 7?
You can find similar books in the "Read Also" column, or choose other free books by Biological Society of Washington to read onlineMoreLess
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