00351nas a2200109 4500008004100000245006200041210006200103300001200165490000700177100001600184856004100200 1982 eng d00aAcoustic communication and baffling behaviors of crickets0 aAcoustic communication and baffling behaviors of crickets a33–440 v651 aForrest, TG uhttps://bio.acousti.ca/it/node/5314202433nas a2200193 4500008004100000245012400041210006900165300001400234490000800248520178300256653001502039653002402054653002902078653002302107653002502130100001902155700002402174856004102198 1986 eng d00aInsect hearing in the field II. Male spacing behaviour and correlated acoustic cues in the bushcricket Mygalopsis marki0 aInsect hearing in the field II Male spacing behaviour and correl a627–6380 v1593 a

1. Distances between calling maleMygalopsis marki Bailey (Orthoptera: Tettigoniidae) were measured in two geographically distinct populations. Mean intermale distances differed significantly in the two habitats (6.2 m and 11.5 m), but the sound pressure level of the nearest neighbour, measured at each focal male, was close to 65 dB SPL in both populations (Figs. 4, 6).

2. Using the response of an identified auditory interneuron as a ‘biological microphone’, the maximum hearing distance of males was tested. It was found to be affected by the size of the calling male, its posture, perch height and the vegetation density. Perch height alone influenced the maximum broadcast area of males by some 100%. Nearest neighbour distances were less than half the maximum hearing distances, confirming by neurophysiological methods that males do not space on threshold sensitivity to the complete call (Fig. 5).

3. The ability of the bushcricket to perceive the temporal characteristic of the call was also tested with the auditory interneuron over increasing distances from a signaller. The temporal integrity of the song was found to be maintained over the whole broadcasting area (Fig. 9).

4. The call has two energy peaks at 10 kHz and 20 kHz. The intensity of each peak attenuated differentially with increasing distance from the signaller; the low frequency component had a low variance at the nearest neighbour distance (SD: +4 dB/−6 dB) compared to the high frequency component (SD: +5 dB/−12.5 dB) (Fig. 8). The importance of the total sound pressure level and the relative intensity of the major frequency components of the song are discussed in relation to likely cues available to the male for maintaining spacing.

10aFocal Male10aFrequency Component10aHigh Frequency Component10aNeighbour Distance10aSound Pressure Level1 aRömer, Heiner1 aBailey, Winston, J. uhttps://bio.acousti.ca/it/node/5313501309nas a2200145 4500008004100000245013900041210006900180260001600249300001400265490000700279520077300286100002001059700002401079856006001103 1985 eng d00aMale Agonistic Behaviour of the Bushcricket Mygalopsis marki Bailey in Response to Conspecific Song (Orthoptera: Tettigoniidae)0 aMale Agonistic Behaviour of the Bushcricket iMygalopsis markii B cDec-01-1985 a320 - 3300 v703 a

Experiments were conducted on Mygalopsis marki Bailey to determine the response of calling males to singing intruders. By increasing the density of natural aggregations of singing males we were able to observe the behavioural responses of individuals. In high density situations, males sang from lower perches in their plant and this effect was correlated with each male's proximity to other calling males. Furthermore, to examine if resident males were affected by conspecific song, a playback technique was employed using tape recordings of M. marki song. The design of the experiment was such that when confronted with an intruder, steadily increasing the intensity of its song, resident males moved to a lower position in the plant and ceased singing.

1 aDadour, Ian, R.1 aBailey, Winston, J. uhttp://doi.wiley.com/10.1111/j.1439-0310.1985.tb00521.x01113nas a2200157 4500008004100000022001400041245009700055210006900152260001600221300001400237490000600251520061000257100001500867700002400882856004900906 1980 eng d a1442-998500aThe function of sound in male spacing behaviour in bush-crickets (Tettigoniidae, Orthoptera)0 afunction of sound in male spacing behaviour in bushcrickets Tett cJan-09-1980 a275 - 2860 v53 a

This paper examines the spatial dynamics of an aggregation of singing male bush‐crickets (Tettigoniidae) in respect to the degree of regularity between males. Our results establish that singing males of the genus Mygalopsis are regularly spaced within aggregations and that sound is involved in spacing. Attention is focussed on the male strategy of regular spacing within a widely dispersed aggregation in order to attract females reaching sexual maturity within the confines of that population. This is seen as an alternate to male aggregations attracting females from outside their boundary.

1 aThiele, D.1 aBailey, Winston, J. uhttp://www.blackwell-synergy.com/toc/aec/5/301362nas a2200157 4500008004100000022001300041245012000054210006900174260001600243300001400259490000700273520080800280100002401088700002101112856007101133 1983 eng d a0001727200aMechanisms of Defensive Stridulation in the Bushcricket Mygalopsis marki Bailey (Copiphorini, Tettigoniidae)0 aMechanisms of Defensive Stridulation in the Bushcricket iMygalop cJan-06-1983 a117 - 1220 v643 a

The copiphorine tettigoniid Mygalopsis marki uses two acoustic defensive displays which are quite distinct from the tegminal stridulatory mechanism. Both adults and nymphs utilise a stridulation produced within the head capsule. Observation and simple experiment reveal that this sound is produced in conjunction with the passage of air into the buccal cavity. There are large trachea beneath the frons which may be associated as amplifiers of these noises. The hind wings of the adults have small downward projecting spines set in open membranous areas of the wings. When the insect is excited, these spines engage a highly specialised area of the cuticle on the dorsal terga. The production of the noise requires only slight movement of the abdomen. Its role in defense is discussed.

1 aBailey, Winston, J.1 aSandow, John, D. uhttp://blackwell-synergy.com/doi/abs/10.1111/azo.1983.64.issue-2-3