Investigations on Fucus vesiculosus and Fucus serratus at outer Kiel Fjord over one year (August 2012 - July 2013)

Macroalgae, especially perennial species, are exposed to a seasonally variable fouling pressure. It was hypothesized that macroalgae regulate their antifouling defense to fouling pressure. Over one year, the macrofouling pressure and the chemical anti-macrofouling defense strength of the brown algae Fucus vesiculosus and Fucus serratus were assessed with monthly evaluation. The anti-macrofouling defense was assessed by means of surface-extracted Fucus metabolites tested at near-natural concentrations in a novel in situ bioassay. Additionally, the mannitol content of both Fucus species was determined to assess resource availability for defense production. The surface chemistry of both Fucus species exhibited seasonal variability in attractiveness to Amphibalanus improvisus and Mytilus edulis. Of this variability, 50-60% is explained by a sinusoidal model. Only F. vesiculosus extracts originating from the spring and summer significantly deterred settlement of A. improvisus. The strength of macroalgal antifouling defense did not correlate either with in situ macrofouling pressure or with measured mannitol content, which, however, were never depleted.

Kur-Brandenburgs Anteil an den kaiserlichen Wahl-Kapitulationen von 1689 bis 1742.

Part I appeared as the author's inaugural dissertation, Göttingen, 1909 (viii, 62 p.)

Die romanischen Sprachen in ihrem Verhältnisse zum lateinischen von August Fuchs : nebst einer Karte des romanischer Sprachgebiets in Europa.

Edited after the author's death by L.G. Blanc.

August Lafontaine's Leben und Wirken /

Mode of access: Internet.

Die wahl des freiherrn von Wangenheim zum abgeordneten in die würtembergische ständeversammlung. Nebst einem anhange über den deutschen bund und die unmöglichkeit moderner freistaaten. Im april und mai 1832.

Mode of access: Internet.

Briefe des Herzogs Karl August von Sachsen-Weimar-Eisenach an Knebel und Herder.

Mode of access: Internet.

Calmuc Tartary; or, A journey from Sarepta to several Calmuc hordes of the Astracan government; from May 26 to August 21, 1823.

Translation of the author's "Reise von Sarepta", Leipzig, 1827.

Microfouling investigations on Fucus vesiculosus and Fucus serratus at outer Kiel Fjord over one year (August 2012 - July 2013)

The present microfouling and bioassay data were used to analyse whether microfouling control of F. vesiculosus and F. serratus against prokaryotes and pennate diatoms fluctuates with season and correlates with in situ microfouling pressure. The two perennial brown macroalgae Fucus vesiculosus and Fucus serratus were sampled monthly from mixed stands at a depth of 0.5 m under mid water level at Bülk, outer Kiel Fjord, Germany (54°27'21 N / 10°11'57 E) within a one-year filed study (August 2012 - July 2013). Microfouler recruitment on glass (reference surface, n = 9 per month) and on both Fucus species (n = 9 per month and Fucus species) was determined monthly. Microfouling control strength of Fucus surface metabolites was tested by an in situ bioassay approach (n = 6 per month and species). For details see related publication Rickert et al. 2016, DOI: 10.1007/s00227-016-2970-3.