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Non-consumptive effects of spiders on herbivore and carnivore prey


In trophic interactions, predator effects on prey populations through consumption are often exceeded by non-consumptive effects that predators elicit on prey behaviour. Spiders can elicit strong antipredator behaviour in both insects and other spiders. However, antipredator behaviour has only been investigated in a limited number of insect and spider species. We will investigate the occurrence and strength of antipredator behaviour across spider and insect species that cover a wide taxonomic range.
Ecological impact
Roman Bucher will investigate to what extent non-consumptive effects cascade down to lower trophic levels. Therefore series of lab and field experiments will be conducted to quantify plant choice and herbivory in relation to predation risk. Furthermore, we are interested in fitness consequences of antipredator behaviour on prey individuals. Measured antipredator behaviour will include both small-scale movement and the propensity for long-distance dispersal.
Mechanisms of detecting predation risk
Hellena Binz will use bioassays and analytical methods to investigate how the presence of spider predators is detected by prey species. Spider silk, faeces, chemical footprints, and airborne volatile cues will be distinguished as pathways for predation risk detection. Further, mechanical and chemical cues of spider silk will be separated. We will test if predation risk is detected via tactile senses, olfaction and/or contact chemoreception. Finally, the substances involved in risk detection will be identified using gas chromatography and mass spectrometry.

Date of news May 07, 2021 10:14 PM