This study investigates the spatial and temporal dynamics of floral resources in the agricultural landscape of Triesdorf, Bavaria (southern Germany), during the 2024 vegetation period. While previous research has focused on landscape-wide or land-use-typespecific floral availability, this study provides a fine-scale analysis of the continuity and connectivity of floral resources at the plot level. Data collection happened fortnightly to tri-weekly on a plot-specific basis across the 1 km² study area. The present study focuses on flowers of the genus Ranunculus as well as those plant species that are particularly favoured by wild bees (high visitor richness species). Using Chelostoma florisomne as a model organism, the potential number of brood cells was estimated based on the availability of Ranunculus flowers as well as hypothetical nesting sites. Two indices (PXbm and Flux-Index) were used to assess resource availability and connectivity. Graphab software was used to model the habitat network. Temporal continuity was analysed using a hexagonal grid. The study shows that the availability of flowers in the Triesdorf study area is strongly dependent on land use, plot-specific management and landscape configuration. Linear structures play an important role in connecting floral patches and providing resources, especially in times of low availability of floral resources.
Zum Einfluss der Landnutzung auf die Vernetzung des Blütenangebots in der Agrarlandschaft - Erste Ergebnisse aus Mittelfranken (2024) Schriftenreihe der Bayerischen Landesanstalt für Landwirtschaft 2024 (5), S. 178-182.
In this study we analysed the connectivity of floral resources in the study area north of Triesdorf (1 km²) from May to June 2023. Via remote sensing the study area was divided into individual areas (patches) where the number of open blossoms per plant species was recorded fortnightly on 20 m2. A 75 m wide buffer was drawn around each patch with the presence of at least one key plant species in blossom to represent connectivity. The results show an increase in connected patches during the study period, with linear elements playing an important role for connectivity.
Land use determines the temporal and spatial patterns of flower resources in agricultural landscapes and has a considerable impact on insect populations. We studied the availability of floral resources throughout the year 2024 in two 1 km² study areas, that are organically farmed. The average flower density of selected plant species was quantified within a hexagonal raster (mesh size 100 m) over 14 time steps, based on flower counts. Grassland management is the most important factor for the availability of floral resources whereas arable land contributes very little. Linear structures such as strips along fields or paths are not important in terms of the number of flowers they provide, but they play an essential role in connecting patches with floral resources. Clover-herb mixtures can provide the same proportion of floral resources as grassland, especially in late summer.
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Larsia Irlbeck,
Sabine Brachmann,
Paula Lauterwasser,
Carmen Nebauer,
Sandra Riesch,
Sara Diana Leonhardt,
Peer Urbatzka,
Michael Rudner
Berechtigungen: Peer Reviewed
Einfluss der Bewirtschaftung auf das Blütenangebot im Jahresverlauf – Ergebnisse des Projekts APART (2026) Vortrag und Artikel im Tagungsband der 18. Wissenschaftstagung Ökologischer Landbau - WiTa 26 , S. 216: 1-4.
Land use determines the temporal and spatial patterns of flower resources in agricultural landscapes and has a considerable impact on insect populations. We studied the availability of floral resources throughout the year 2024 in two 1 km² study areas, that are organically farmed. The average flower density of selected plant species was quantified within a hexagonal raster (mesh size 100 m) over 14 time steps, based on flower counts. Grassland management is the most important factor for the availability of floral resources whereas arable land contributes very little. Linear structures such as strips along fields or paths are not important in terms of the number of flowers they provide, but they play an essential role in connecting patches with floral resources. Clover-herb mixtures can provide the same proportion of floral resources as grassland, especially in late summer.
Sandra Riesch,
Sabine Brachmann,
Larsia Irlbeck,
Carmen Nebauer,
Paula Lauterwasser,
Juliane Tanz,
Michael Rudner,
Sara Diana Leonhardt,
Peer Urbatzka
Berechtigungen: Peer Reviewed
Monitoring von Bestäubern durch automatisierte Kameras in landwirtschaftlichen geprägten Landschaften (2026) Posterpräsentation und Artikel im Tagungsband der 18. Wissenschaftstagung Ökologischer Landbau - WiTa26 , S. 227: 1-4.
Pollinators play an important role in agricultural systems. They enhance crop productivity and help maintain biodiversity. Understanding their abundance and diversity is essential for sustainable farming practices. We used an innovative approach to studying pollinators in agricultural landscapes using automated camera traps and artificial intelligence. Our study conducts a continuous assessment of different habitat structures to evaluate their impact on the abundance and taxonomic richness of key pollinator groups. The goal is to evaluate how changes throughout the year influence the abundance and diversity of pollinator groups in different habitats. The results emphasize the importance of diverse habitats, especially field margins, for maintaining pollinator diversity and activity during the vegetation period. AI correctly assigned over 90% of hoverflies, wasps, and honeybees to the correct taxa, while wild bees, butterflies, and bumblebees were identified less accurately. The camera-trap system shows potential for standardized pollinator monitoring in agricultural environments.
Sabine Brachmann,
Larsia Irlbeck,
Sara Diana Leonhardt,
Carmen Nebauer,
Sandra Riesch,
Michael Rudner,
Peer Urbatzka
APART – Agrarpflanzen für Bestäuber (2025) AgoMissionHub – Show and Tell, Weihenstephan .
Vorträge
Larsia Irlbeck
Blütenangebot in der Landschaft - Rolle der Linienstrukturen (2025) Symposium Linienstrukturen in der Landschaft - Biodiversität im Straßenbegleitgrün, an Wegrändern und Feldrainen .
Larsia Irlbeck,
Michael Rudner
Ressourcenangebot für Bestäuber in der Agrarlandschaft - Projekt APART (2025) Vortrag, Jahrestagung der Reinhold-Tüxen-Gesellschaft .
Larsia Irlbeck,
Michael Rudner
Blütenangebot in der Agrarlandschaft - Projekt APART (2025) Vortrag, FORUM Triesdorf am 28.01.2025 .
Transferveranstaltungen
Andrea Früh-Müller,
Larsia Irlbeck,
Michael Rudner
Beim Symposium haben wir uns unter anderem diesen Fragen zugewandt: §Welche Kriterien sind für eine nachhaltige, biodiversitäts- fördernde Bewirtschaftung der Linienstrukturen relevant? §Welche Bewirtschaftung lässt sich tatsächlich umsetzen? §Wie können wir die Akzeptanz für diese Maßnahmen fördern? Es gab zwei Blöcke mit Impulsvorträgen zu den verschiedenen thematischen Aspekten. Dabei kamen Gruppen von Akteuren zu Wort. Das Symposium wurde mit einer Podiumsdiskussion abgeschlossen.
Der zu konzipierende Classic vhb Kurs „Biodiversität und Ökosystemleistungen“ ist als Wahlpflichtmodul angelegt und für Masterstudierende mit Vorkenntnissen in Umweltwissenschaften, Biologie, …
Ermittlung der Bedeutung einzelner Pflanzenarten hinsichtlich Qualität und Eignung für Bestäuber mit unterschiedlichen Ansprüchen an Ressourcenmenge und Nahrungsqualität.
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