Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Том 107American Philosophical Society, 1963 |
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Сторінка 25
... areas of sympatry . Some confusion may occur when a Fee - bee - o uses a combination of pit followed by wee - 00 ( q.v. ) . Where courtship and sound are isolating mech- anisms , selection emphasizes distinctiveness in these ...
... areas of sympatry . Some confusion may occur when a Fee - bee - o uses a combination of pit followed by wee - 00 ( q.v. ) . Where courtship and sound are isolating mech- anisms , selection emphasizes distinctiveness in these ...
Сторінка 27
... areas or into areas where they are displacing the Fee - bee - os . The de- crease in forests in the east probably has con- tributed to this spread . Lack's ( 1947 ) suggestion that where the two forms come into contact , one may be ...
... areas or into areas where they are displacing the Fee - bee - os . The de- crease in forests in the east probably has con- tributed to this spread . Lack's ( 1947 ) suggestion that where the two forms come into contact , one may be ...
Сторінка 48
... areas , Fitz - bews along streams and lake edges in grassland areas . 13 ) Fitz - bews " prefer " willow and rose to other genera of shrubs as nesting sites , Fee - bee - os show no such selection . 14 ) Fee - bee - os build their nests ...
... areas , Fitz - bews along streams and lake edges in grassland areas . 13 ) Fitz - bews " prefer " willow and rose to other genera of shrubs as nesting sites , Fee - bee - os show no such selection . 14 ) Fee - bee - os build their nests ...
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Isolating Mechanisms Between Populations of Traills Flycatchers ROBERT CARRINGTON | 21 |
Spinoza in England 16651730 Rosalie L COLIE | 183 |
The Ideological Antecedents of the RollsRoyce Radiator ERWIN PANOFSKY | 273 |
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