Ein neues ökomorphologisches Lebensformen-System der aquatischen Makrophyten tab: 2
[A new eco-morphological life-form system for the aquatic macrophytes]
After a preliminary critical examination of certain systems proposed for the aquatic macrophytes, an eco-morhpological life-form system is outlined based principally on the system of Du Rietz (1930). Especial attention is devoted to the criteria for distinguishing the life-forms, the plants being grouped by reference to nine morphological features, anatomical or organological, all of which are of established ecological validity. Initial categorization is based on the possession of emerged, floating or submerged leaves, with the remaining six characteristics providing a more specific classification. The system has been developed for the classification of the relatively varied macrophyte flora of Lake Kukkia, area 42 km2 in Southern Finland, into eight life-forms: helophytes, nymphaeids, isoetids, lemnids, elodeids, ceratophyllids, charids and bryids, all of which may be further sub-divided in one or more ways employing eco-morphological criteria which, although observed to be adequate, are judged to be of secondary importance in the case of the aquatic plants. Certain heteromorphic aquatic species, e.g. the heteroblastic species, develop forms which are distributed among a number of subclasses or even a number of major classes within the present system.