The authors underline the importance of small, apparently unattractive habitat enclaves. They believe that a complete inventory of all such habitats in Poland should be done in the near future, and at least some of them should be placed under protection. The law on nature conservation provides for protection of such enclaves in the form of so-called ecological grounds. The example of small, 52-hectare Bugaj water reservoir, located in the Piotrków Trybunalski area, is given as an example which supports such a standpoint.