Contribution to the characteristic of Cladium mariscus (L.) Pohl population in the initial zone of floating mat on an oligo-humotrophic lake in north-eastern Poland

Abstract

In the initial phase of growth in an oligo-humotrophic lake, Cladium mariscus forms a dense and tall sawgrass bed invading the open water in the form of a floating mat. High densities of submerged evergreen perennial stems of C. mariscus, over two metres high and abundantly fruiting, ensure its persistence, and form a natural barrier to the invasion of other species. Dense mats of sawgrass are formed as a result of clonal and rhizome growth. Although diaspore production is abundant under natural conditions, only vegetative propagation of stems was observed. In different variants of the experiment only seeds wintering on stems of mother plants were capable of germinating. Hard seed coats had an important effect on the germination capacity of seeds.

Rich fen development in CE Europe, resilience to climate change and human impact over the last ca. 3500 years

“…mariscus occurrence in Central Europe has decreased in recent centuries due to human activity (drainage), the oligotrophication of habitats and the lack of access to carbonate sediments (Salmina, 2004;Gałka and Tobolski, 2012). Presently C. mariscus is still occurs mainly around outflow depressions, where there is good supply of carbonate ions from the dissolution of the carbonate bedrock (Buczek, 2005), or around lakes as an emerged plant (Namura-Ochalska, 2005;Karcz, 2008;Gałka and Tobolski, 2012) where Ca 2+ ions are supplied from dissolution of carbonates in glacial sediments.…”