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Beschreibung

An important component of the forest floor vegetation is the European blueberry Vaccinium myrtillus L. (Ericaceae), as it is a crucial food resource for many mammals, insects and birds. Adaptation actions of the German forestry for climate change could decrease the abundance of blueberry. Also, studies have shown that the reproduction of the blueberry is influenced by the sun exposition. To understand and predict future changes in the abundance of the blueberry, I gathered insights about the pollination biology and the influence of sun exposition on the flower, fruit and seed set of V. myrtillus. Further, I reviewed Traditional Ecological Knowledge regarding the effect of sun exposition on diameter and sugar content of blueberry fruits. The datasets were collected from April to July 2017 in the valley of Schönmünzach in the Black Forest National Park. The overstory of the site consisted mainly of Norway spruce (Picea abies). Five pollinating insects of three genera were found for the blueberry (Andrena, Bombus and Halictus). With its remote location, no honeybees were present. Bombus pascuorum and Bombus sylvestris were so far not described as visitors of V. myrtillus in Germany. Overall, flower and fruit set were higher on shrubs that were exposed to the sun. Fruits that developed in the shade had fewer seeds compared to fruits in semi-shade and sun. In the sun, the percentage of developed seeds was highest. This is probably linked to a higher pollinator activity on these microsites. With a higher solar irradiance, the probability of flower occurrence was higher. The results show the importance of sunny microsites for the sexual reproduction of the blueberry. With this, management plans of the capercaillie can benefit positively. The review of the TEK revealed that contrary to common belief, the fruits in this study were bigger and sweeter in the sun. However, through methodological issues and its strong local character, the TEK can neither be refuted nor confirmed.

Übergeordnete Objekte

Beendete Forschungsprojekte

Adressen

Ansprechpartner

Nationalpark Schwarzwald
FB2 Ökologisches Monitoring, Forschung und Artenschutz
Herr Dr. Jörn Buse

E-Mail joern.buse@nlp.bwl.de

Ansprechpartner

Universität Freiburg
Fakultät für Umwelt und Natürliche Ressourcen
Frau Dr. Gesine Pufal

Deutschland

E-Mail gesine.pufal@nature.uni-freiburg.de

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