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Title of article :
Seasonality, montane beta diversity, and Eocene insects: Testing Janzenʹs dispersal hypothesis in an equable world
Author/Authors :
Archibald، نويسنده , , S. Bruce and Greenwood، نويسنده , , David R. and Mathewes، نويسنده , , Rolf W.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
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Abstract :
We test Janzenʹs (1967) hypothesis that the low temperature seasonality in the modern tropics accounts for increased local species turnover (beta diversity) across montane landscapes relative to those of the more seasonal Temperate Zone. In the Eocene, low seasonality extended beyond the hot tropics to Polar Regions, therefore, its effects on montane dispersal ability should have been decoupled from low latitude. We sampled fossil insect communities across the Okanagan Highlands: a thousand kilometer transect of temperate, low temperature seasonality, higher mid-latitude Eocene uplands of far-western North America. We find high species turnover, supporting a prime role of temperature fluctuation in controlling montane beta diversity. This high upper mid-latitude montane endemism is consistent with greater Eocene global biodiversity.
Keywords :
Beta diversity , Eocene , Fossil insects , Paleoentomology , Okanagan Highlands
Journal title :
Palaeogeography, Palaeoclimatology, Palaeoecology
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