Advanced search    

Search: authors:"Gerald Kastberger"

12 papers found.
Use AND, OR, NOT, +word, -word, "long phrase", (parentheses) to fine-tune your search.

Evidence for Ventilation through Collective Respiratory Movements in Giant Honeybee (Apis dorsata) Nests

The Asian giant honeybees (Apis dorsata) build single-comb nests in the open, which makes this species particularly susceptible to environmental strains. Long-term infrared (IR) records documented cool nest regions (CNR) at the bee curtain (nCNR = 207, nnests > 20) distinguished by marked negative gradients (ΔTCNR/d < -3°C / 5 cm) at their margins. CNRs develop and recede within...

Giant honeybees (Apis dorsata) mob wasps away from the nest by directed visual patterns

The open nesting behaviour of giant honeybees (Apis dorsata) accounts for the evolution of a series of defence strategies to protect the colonies from predation. In particular, the concerted action of shimmering behaviour is known to effectively confuse and repel predators. In shimmering, bees on the nest surface flip their abdomens in a highly coordinated manner to generate...

Social waves in giant honeybees (Apis dorsata) elicit nest vibrations

Gerald Kastberger 0 Frank Weihmann 0 Thomas Hoetzl 0 0 Communicated by: Sven Thatje Giant honeybees (Apis dorsata) nest in the open and have developed a wide array of strategies for colony defence

‘Special agents’ trigger social waves in giant honeybees (Apis dorsata)

Evelyn Schmelzer Gerald Kastberger 0 ) Institute of Zoology, University of Graz, Universittsplatz 2 , 8010 Graz, Austria Giant honeybees (Apis dorsata) nest in the open and have therefore evolved a

Speeding Up Social Waves. Propagation Mechanisms of Shimmering in Giant Honeybees

Shimmering is a defence behaviour in giant honeybees (Apis dorsata), whereby bees on the nest surface flip their abdomen upwards in a Mexican wave-like process. However, information spreads faster than can be ascribed to bucket bridging, which is the transfer of information from one individual to an adjacent one. We identified a saltatoric process that speeds up shimmering by the...

How to Join a Wave: Decision-Making Processes in Shimmering Behavior of Giant Honeybees (Apis dorsata)

Shimmering is a collective defence behaviour in Giant honeybees (Apis dorsata) whereby individual bees flip their abdomen upwards, producing Mexican wave-like patterns on the nest surface. Bucket bridging has been used to explain the spread of information in a chain of members including three testable concepts: first, linearity assumes that individual “agent bees” that...

Social Waves in Giant Honeybees Repel Hornets

Giant honeybees (Apis dorsata) nest in the open and have evolved a plethora of defence behaviors. Against predatory wasps, including hornets, they display highly coordinated Mexican wave-like cascades termed ‘shimmering’. Shimmering starts at distinct spots on the nest surface and then spreads across the nest within a split second whereby hundreds of individual bees flip their...

Infrared imaging technology and biological applications

GERALD KASTBERGER ) 0 1 2 0 We thank Helmut Kfer (Graz) for assistance with infrared record- ing from giant honeybees in Assam, epo-film (Vienna-Graz) for logis- tic help, and nbn Elektronik Graz for

Stereoscopic motion analysis in densely packed clusters: 3D analysis of the shimmering behaviour in Giant honey bees

Background The detailed interpretation of mass phenomena such as human escape panic or swarm behaviour in birds, fish and insects requires detailed analysis of the 3D movements of individual participants. Here, we describe the adaptation of a 3D stereoscopic imaging method to measure the positional coordinates of individual agents in densely packed clusters. The method was...

Aggressive and Docile Colony Defence Patterns in Apis mellifera. A Retreater–Releaser Concept

Colony defence in Apis mellifera involves a variety of traits ranging from ‘aggressive’ (e.g. entrance guarding, recruitment of flying guards) to ‘docile’ (e.g. retreating into the nest) expression. We tested 11 colonies of three subspecies (capensis, scutellata, carnica) regarding their defensiveness. Each colony was selected as reportedly ‘aggressive’, ‘intermediate’ or ‘docile...

Visualization of multiple influences on ocellar flight control in giant honeybees with the data-mining tool Viscovery SOMine

Neurobiology, Karl Franzens University , A80 I0 Graz, Austria ( 1 GERALD KASTBERGER Karl-Franzens University , Graz, Austria Viscovery SOMine is a software tool for advanced analysis and monitoring of numerical