no, its not a typo, context is the differnce between animals in north and south Pakistan:
A gradual change in a character or feature across the distributional range of a species or population, usually correlated with an environmental or geographic transition.
[From Greek klīnein, to lean.]"http://www.answers.com/cline&r=67
Dorland's Illustarted Medical Dictionary:
"cline (cline) (klīn) [Gr. klinein to cause to slope] a continuous series of differences in structure or function exhibited by the members of a species along a line extending from one part of their range to another."http://www.mercksource.com/pp/us/cns/cns_hl_d...
As a non-native German speaker, I very tentatively offer "Klin"
"... verändern sich entlang eines horizontalen oder vertikalen geographischen Gradienten (=Klin., engl. cline) ..."http://www.nlu.unibas.ch/PDF/Tiergeographie/V...
needs to be confirmed by a native speaker