โ Scribed by Elly P. H. Best
No coin nor oath required. For personal study only.
The macrophytic species compositions in Lake Vechten of 1963 and 1979-80 were compared and showed a considerable change . The main vegetation types were mapped in 1973, 1978, 1979 and 1980 . All macrophytic communities, i .e . submerged, floating-leaved and emergent vegetation types, declined mainly due to increasing water turbidity, increasing tree-shading and, from 1978 onwards, grazing and trampling by cattle .
Production rates, derived from different combinations of measurement and calculation, were compared . The macrophytes contributed only about 7% to the total lake production in 1980 .
๐ SIMILAR VOLUMES
## Abstract Species composition, abundance, and spatial distribution of rotifer and crustacean zooplankton were studied in Lake Ziway from late April to early July 2004. A total of 49 rotifer species was recorded, with __Anuraeopsis fissa, Brachionus angularis, Filinia novaezealandiae,__ and __Tri
The concentration of nutrients in Nymphoides indica (L.) 0. Kuntze, Pontederia cordata L., Andropogon bicornis L. and Utricularia breviscapa Griseb was analyzed at monthly intervals from January 1980 through February 198 1. The macrophytes strongly influenced the organic nitrogen and phosphorus conc