Effects of sequential stressors on survival of young life stages of the bladder wrack Fucus vesiculosus L.

  • Over the last decades, Fucus vesiculosus, an ecologically important macroalga in the German Baltic Sea, has shown a massive retreat from the deeper zones of its former distribution presumably due to low light co-acting with other potential stressors such as high temperature, fouling, and grazing. Global warming may increase abiotic as well as biotic pressures and exacerbate environmental conditions in coastal ecosystems. The present study focussed on the effects of single or subsequently combined stressors on survival and palatability of juvenile F. vesiculosus. Fucoid offspring were exposed to high temperature and/ or feeding pressure. Feeding preference of Idotea baltica was quantified in a pellet assay calculated as an odds ratio. High temperature significantly impaired the survival of juvenile fucoids. Neither single nor combined stress considerably influenced the feeding preference of I. baltica. Surprisingly I. baltica strictly avoided pellets with juvenile F. vesiculosus compared to adult F. vesiculosus. Avoidance tended to be less pronounced in juvenile fucoids previously stressed by high temperature. Obviously grazing does not induce anti-herbivore defence, but rather the young plants appeared constitutively well-protected against isopod feeding. These results contradict the prevailing opinion that juvenile F. vesiculosus is more susceptible to herbivore grazing than adult F. vesiculosus.

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Metadaten
Verfasserangaben:Kerstin Maczassek
URN:urn:nbn:de:gbv:18-7-10560
Schriftenreihe (Bandnummer):RADOST-Berichtsreihe (25)
Dokumentart:Bericht
Sprache:Englisch
Datum der Veröffentlichung (online):27.04.2015
Jahr der Erstveröffentlichung:2014
Veröffentlichende Institution:Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky
Urhebende Körperschaft:Ecologic Institut
Datum der Freischaltung:15.06.2015
Freies Schlagwort / Tag:Vulnerabilität
Seitenzahl:28
Institute:RADOST
Zielgruppe:Wissenschaft
Klimawandelsignal:Durchschnittliche Veränderungen / Temperatur
Ressourcen:Gewässer
Handlungsfelder:Naturschutz und biologische Vielfalt
Natur- und Siedlungsraum:Küste und Meer
Region:Ostseeküste
Methodik:Experiment
Feldstudie
Lizenz (Deutsch):License LogoNutzungseinräumung

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