Physical Ecology of Fluid Flow Sensing in Arthropods

Casas, Jérôme; Dangles, Olivier

doi:10.1146/annurev-ento-112408-085342

Cited by 77 publications

(63 citation statements)

References 79 publications

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“…Air-puffs detected by the cercal system of crickets and other insects elicit at least 14 distinct reactions including evasion, flight, offensive reactions, scanning and freezing, and the response depends on the behavioral state and environmental context of the individual concerned (Baba and Shimozawa, 1997;Casas and Dangles, 2010). This implies that cercal-mediated behavior can be modulated by additional sensory information from other modalities.…”

Section: Elevation Of the Response Thresholdmentioning

confidence: 99%

Auditory modulation of wind-elicited walking behavior in the cricket, Gryllus bimaculatus

Fukutomi

Someya

Ogawa

2015

Journal of Experimental Biology

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Animals flexibly change their locomotion triggered by an identical stimulus depending on the environmental context and behavioral state. This indicates that additional sensory inputs in different modality from the stimulus triggering the escape response affect the neuronal circuit governing that behavior. However, how the spatio-temporal relationships between these two stimuli effect a behavioral change remains unknown. We studied this question, using crickets, which respond to a short air-puff by oriented walking activity mediated by the cercal sensory system. In addition, an acoustic stimulus, such as conspecific 'song' received by the tympanal organ, elicits a distinct oriented locomotion termed phonotaxis. In this study, we examined the cross-modal effects on wind-elicited walking when an acoustic stimulus was preceded by an air-puff and tested whether the auditory modulation depends on the coincidence of the direction of both stimuli. A preceding 10 kHz pure tone biased the wind-elicited walking in a backward direction and elevated a threshold of the windelicited response, whereas other movement parameters, including turn angle, reaction time, walking speed and distance were unaffected. The auditory modulations, however, did not depend on the coincidence of the stimulus directions. A preceding sound consistently altered the wind-elicited walking direction and response probability throughout the experimental sessions, meaning that the auditory modulation did not result from previous experience or associative learning. These results suggest that the cricket nervous system is able to integrate auditory and air-puff stimuli, and modulate the wind-elicited escape behavior depending on the acoustic context.

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Section: Elevation Of the Response Thresholdmentioning

confidence: 99%

Auditory modulation of wind-elicited walking behavior in the cricket, Gryllus bimaculatus

Fukutomi

Someya

Ogawa

2015

Journal of Experimental Biology

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“…Also, it has been assumed that the directionality of the signal remains constant between the source and the receiver. However, the presence of an object in a flow, be it a receiver or the organism itself, can change the amplitude and direction of the signal as viscous forces become dominant in a layer around the object (Casas and Dangles, 2010;Schlichting, 1979).…”

Section: Introductionmentioning

confidence: 99%

“…The effects due to the presence of such boundary layers are usually a well-known phenomenon in fluid dynamics and have been studied in biological systems such as swimming (Anderson et al, 2001;Nauen and Lauder, 2001), olfaction (Cox, 2008;Koehl, 2006) and fluid sensing in both air and water (for a review, see Casas and Dangles, 2010). However, the biological contexts in which boundary layer effects are considered usually concern bulk air flow and sensing by arrays of hairs.…”

Section: Introductionmentioning

confidence: 99%

Directional cues inDrosophila melanogasteraudition: structure of acoustic flow and inter-antennal velocity differences

Morley

Steinmann

Casas

et al. 2012

Journal of Experimental Biology

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SUMMARYDrosophila melanogaster have bilateral antisymmetric antennae that receive the particle velocity component of an acoustic stimulus. Acoustic communication is important in their courtship, which takes place in the acoustic near-field. Here, the small size of the dipole sound source (the male wing) and the rapid attenuation rate of particle velocity produce a spatially divergent sound field with highly variable magnitude. Also, male and female D. melanogaster are not usually stationary during courtship, resulting in a variable directionality of the acoustic stimulus. Using both particle image velocimetry and laser Doppler vibrometry, we examined the stimulus flow around the head of D. melanogaster to identify the actual geometry of the acoustic input to the antennae and its directional response. We reveal that the stimulus changes in both magnitude and direction as a function of its angle of incidence. Remarkably, directionality is substantial, with inter-antennal velocity differences of 25dB at 140Hz. For an organism whose auditory receivers are separated by only 660±51m (mean ± s.d.), this inter-antennal velocity difference is far greater than differences in intensity observed between tympanal ears for organisms of similar scale. Further, the mechanical sensitivity of the antennae changes as a function of the angle of incidence of the acoustic stimulus, with peak responses along axes at 45 and 315deg relative to the longitudinal body axis. This work indicates not only that the flies are able to detect differential cues in signal direction, but also that the male song structure may not be the sole determinant of mating success; his spatial positioning is also crucial to female sound reception and therefore also perhaps to her decision making.

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“…Cell wall fragments, extracellular DNA, and extracellular ATP are generalized cues of physical damage that elicit responses in both plants and animals [16 ]. Crickets sense speed of predator [73] Glandular trichomes…”

Section: Plant Cues Provide Information About Herbivoresmentioning

confidence: 99%