Stefan Greif's research while affiliated with Tel Aviv University and other places

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Publications (5)

Fig. 1: Greater mouse-eared bats tagged on different nights show wide...
Fig. 2: Habitat influences foraging success of greater mouse-eared only...
Fig. 3: Ground prey is larger than aerial prey and sufficient to offset...
Echolocating bats prefer a high risk-high gain foraging strategy to increase prey profitability
Preprint
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  • Oct 2022
Most bats catch nocturnal prey during active flight guided by echolocation but some species depart from this ancestral behaviour to capture ground prey using passive listening. Here, we explore the costs and benefits of these hunting transitions by combining high-resolution biologging data and DNA metabarcoding to quantify the relative contribution...
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Tasks for prey localization
Acoustically eavesdropping predators take longer to capture prey signalling in aggregation
Article
Full-text available
  • Apr 2021
Prey signalling in aggregation become more conspicuous with increasing numbers and tend to attract more predators. Such grouping may, however, benefit prey by lowering the risk of being captured due to the predator's difficulty in targeting individuals. Previous studies have investigated anti-predatory benefits of prey aggregation using visual pred...
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Fig. 1. Bats adjust their vocalizations to receive unmasked prey echoes...
Fig. 2. Bats switch from a deliberate to a reactive sensorimotor mode...
Fig. 3. Hunting bats actively generate weak prey echoes from a large...
Fig. 4. Bats separate prey and clutter echo streams by acoustic gaze...
Hunting bats adjust their echolocation to receive weak prey echoes for clutter reduction
Article
Full-text available
  • Mar 2021
How animals extract information from their surroundings to guide motor patterns is central to their survival. Here, we use echo-recording tags to show how wild hunting bats adjust their sensory strategies to their prey and natural environment. When searching, bats maximize the chances of detecting small prey by using large sensory volumes. During p...
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Fig. 3. Predicted relative acoustic activity (estimate and SE) of M....
Fig. 4. Predicted relative acoustic activity of Rhinolophus spp., M....
The effect of cave illumination on bats
Article
Full-text available
  • Oct 2019
Artificial light at night has large impacts on nocturnal wildlife such as bats, yet its effect varies with wavelength of light, context, and across species involved. Here, we studied in two experiments how wild bats of cave-roosting species (Rhinolophus mehelyi, R. euryale, Myotis capaccinii and Miniopterus schreibersii) respond to LED lights of di...
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Citations

... Maintaining a continuous sing-along but extending their signaling for several hours also comes with its downsides, which require further adaptations in response to visual predators, as we will discuss later. Previous works have described how katydid aggregation in space can lower the effectiveness of bat captures (Prakash et al., 2021). Although we did not test the relationship between acoustic frequency and duration of the diel calling activity, our preliminary analysis suggests that species with lower dominant frequencies tend to call for shorter periods (e.g., Cricket1 vs Katydid5; Fig. S1). ...
Reference: Satellite remote sensing of environmental variables can predict acoustic activity of an orthopteran assemblage
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... The development of miniaturized bat-borne acoustic tags rectifies many of the limitations possessed by large microphone arrays as data are recorded from any habitat the bat moves in while wearing the tag (Cvikel et al., 2015;Stidsholt et al., 2019;Stidsholt, Greif, et al., 2021;. But bat-borne acoustic tags are also limited by recording off axis and by the carrying capacity of bats, currently limiting the use of tags to bats above 12 g at best (Egert-Berg et al., 2018;Stidsholt et al., 2019). ...
Reference: Drone exploration of bat echolocation: A UAV‐borne multimicrophone array to study bat echolocation
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... In some contexts, however, nocturnal color discrimination may not merit the attendant ecological costs. Recent studies show that amber light has a greater impact on the movement of bats (Straka et al. 2019) and sea turtles (Robertson et al. 2016) than does equally bright red light. Deichmann et al. (2021) have found that, compared to standard warm white LEDs, those that have had their blue wavelengths filtered out are less attractive to most insects but more attractive to bioluminescent click beetles and fungus gnats. ...
Reference: Costs and benefits of “insect friendly” artificial lights are taxon specific
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