Ulrich Sommer's Algen, Quallen, Wasserfloh: Die Welt des Planktons PDF

By Ulrich Sommer

ISBN-10: 3540603077

ISBN-13: 9783540603078

ISBN-10: 3642610331

ISBN-13: 9783642610332

Freunden der Natur, der noticeable und der Meere eröffnet dieses Buch einen Einblick in die oft mikroskopisch kleine Welt des Planktons.
Zahlreiche Zeichnungen und Farbtafeln geben einen Eindruck von der Schönheit und Formenvielfalt vieler Plankter. Beispiele aus vielen Gewässern der Erde zeigen, welch wichtige Rolle das Plankton in der Nahrungskette spielt und wie es die Stoffkreisläufe im Wasser und sogar die Atmosphäre beeinflußt.
Schließlich wird die Reaktion des Planktons auf die Gewässerversauerung und die Überdüngung gezeigt und erklärt, welches Gefährdungspotential von Giftalgen ausgehen kann.

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Additional resources for Algen, Quallen, Wasserfloh: Die Welt des Planktons

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Die hochsten Sauerstoffkonzentrationen treten daher dort auf, wo die Lichtverhiiltnisse optimal fur die Photosynthese der Phytoplankter sind. Andererseits verbraucht die Atmung aller im sauerstoffhaltigen Milieu lebenden (aeroben) Organismen Sauerstoff. Wo zu wenig Licht fUr die Photosynthese herrscht, sinkt also die Sauerstoffkonzentration abo Wenn das dunkle Tiefenwasser durch die vertikale 27 Sauerstoffsattigung [%] o 100 o 100 ~ ~~~~~~~~~~~t~~~~~~~~~~~~~l:: 1~~~uu~~~~~~nnn~r ~ :::::=:::::::::::::::::::::::::i::::: 1 1 1 1 1 1 1 1 1 1 1: t~- - - + -------..

Wahrend die Cryptophyceen also das »Gras des Planktons« sind, sind die Dinoflagellaten die »Disteln des Planktons«. Beispiele (Abb. 14) Gymnodinium ist eine in Meer und SuBwasser we it verbreitete Gattung. Die Zellwand ist nicht in panzerartige Platten gegliedert, sondern eine GeiBel lauft in einer Querfurche urn den Zellkorper, die andere lauft zunachst in einer Langskurve, ragt aber nach hinten uber den Korper hinaus. Peridinium hat einen Panzer aus regelmaBig angeordneten Zelluloseplatten. Die Anordnung der GeiBeln stimmt mit der des Gymnodinium uberein.

Dadurch kommt es zu einer Verarmung der gelosten Nahrelemente. Bei einigen Nahrelementen wie Kalzium, Kalium, Chlor und Schwefel sind die Konzentrationen im Wasser jedoch so hoch, daB sich die Zehrung durch das Phytoplankton kaum feststellen laBt. Einige Nahrelemente werden aber so stark gezehrt, daB 25 Konzentration oligotroph eutroph Abb. 5. Sommerliches Vertikalprofil der gelbsten Niihrstoffkonzentrationen in einem niihrstoffarmen (oligotrophen) und einem niihrstoffreichen (eutrophen) Gewiisser.

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Algen, Quallen, Wasserfloh: Die Welt des Planktons by Ulrich Sommer


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