The physical habitat with its biological community; a term which refers to the combination of the physical environment (habitat) and its distinctive assemblage of conspicuous species. So, a biotope combines the concepts of habitat and community for defining geographical units.
- Lincoln R., Boxshall G. and Clark P. (1998). A Dictionary of Ecology, Evolution and Systematics (2nd Ed). Cambridge University Press: Cambridge, (England). 361pp.
- Martin E. and Hine R.S. (2000). Oxford Dictionary of Biology (4th Ed). Oxford University Press: New York, (USA). 641pp.