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MORPHOLOGISCHE UNTERSUCHUNGEN AN POPULATIONEN AUS DEM FORMENKREIS UM NITZSCHIA FRUSTULUM (KÜTZING) GRUNOW

1990; Taylor & Francis; Volume: 5; Issue: 1 Linguagem: Inglês

10.1080/0269249x.1990.9705102

2159-8347

Susanne Wendker,

Marine Biology and Ecology Research

Populations of Nitzschia frustulum-like diatoms occurred in high relative frequencies in periphyton samples from the shore of the Schlei estuary (Schleswig-Holstein, FRG). The populations were examined by light and electron microscopy and analyzed with respect to variation in valve characters, such as length, breadth, fibula density, valve outline, velum structure, the presence of central raphe endings and doubling of the striae near the raphe. Correlations were sought between morphological variation and variation in certain chemical parameters of the environment. A taxonomic determination of the populations is given. The presence of central raphe endings is not always accompanied by a wider separation of the two central fibulae.