The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. n.d. Northern warm temperate Fauna. CUL-DAR50.E57. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 9.2021. RN1

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin.

[E57]

Northern warm temperate Fauna

N. Tropic

N. Tropical Fauna

During glacial period in Equatorial region, humidity & periodicity would be greatly affected; & these are highly important to Faunas; perhaps almost as much so as is Heat

Lat 10° N.

Preglacial Equatorial Fauna & Flora exterminated during glacial periods

Equator

& occupied after glacial period by the former Tropical Faunas

Lat 10° S.

S. Tropic

S. Tropical Fauna

During glacial period the N. & S. Tropical Fauna would mingle & dilute each other & leave places into which a few temperate products might intrude

(This only makes it worse for Tropical productions)

S. Warm temperate Fauna

after cold land gone this mingled Fauna very favourable for reselection of new species.

Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)