Open Access

Margrit Vöge

• Messungen morphologischer Parameter an Potamogetón perfoliatus führten zu zahlreichen positiven Korrelationen wie bereits frühere Untersuchungen an Isoëtes lacustris. Es ergaben sich Übereinstim­mungen trotz unterschiedlicher Lebensgeschichte. Abweichungen spiegeln die unterschiedlichen Wachstumsstrategien wider, die die beiden Arten verfolgen. Weitere Korrelationen zeigen die Abhängig­keit der Blattentwicklung bei P. perfoliatus bzw. der Rosettenausbildung bei I. lacustris von Standortbedingungen. Ergänzende Messungen erwiesen, dass eine Reihe von Regressionsgleichungen für weitere 6 Laichkrautarten bzw. 9 Isoëtes-Taxa gültig ist. Ihre besondere Bedeutung haben die erhaltenen Regressi­onsgleichungen für die zerstörungsfreie Gewinnung von Daten für gefährdete Pflanzenarten und ihre Bestände, beispielsweise den Blattflächenindex; dafür werden Beispiele gegeben.
• Measurements showed numerous correlations among morphological characters of Potamogetón per­foliatus as were obtained earlier in Isoëtes Measurements showed numerous correlations among morphological characters of Potamogetón per­foliatus as were obtained earlier in Isoëtes lacustris. Though both species differ in life history they agree in several ways. Deviations reflect the different growth strategies which the species pursue. Further cor­relations demonstrate the dependence of leaf development in P. perfoliatus and of rosette structure in I. lacustris on site characteristics. Further measurements showed that several regressions established are valid for further 6 Potamogetón species and 9 Isoëtes taxa, respectively. Highly significant regression relationships obtained enable determination of important plant and population data, e.g. leaf area index, by non-destructive methods; some examples are given lacustris. Though both species differ in life history they agree in several ways. Deviations reflect the different growth strategies which the species pursue. Further cor­relations demonstrate the dependence of leaf development in P. perfoliatus and of rosette structure in I. lacustris on site characteristics. Further measurements showed that several regressions established are valid for further 6 Potamogetón species and 9 Isoëtes taxa, respectively. Highly significant regression relationships obtained enable determination of important plant and population data, e. g. leaf area index, by non-destructive methods; some examples are given.