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[Biologie] Communicatie krekels


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#1

Mukkie

    Mukkie


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Geplaatst op 17 december 2007 - 21:30

Zoals de topictitel al zegt, ben ik op zoek naar info over krekels.

Ik zou graag willen weten :
o) Hoe reageren volwassen mannetjes op het tsjirpen van een ander mannetje? en hoe reageren ze op getsjirp uit een micofoon?
o) Hoe reageren volwassen mannetjes op het zien van een ander mannetje?

Alvast bedankt voor de moeite. ( google is niet in een goede bui )

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#2

Klintersaas

    Klintersaas


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Geplaatst op 21 juli 2008 - 19:55

Over krekels en nagebootst getsjirp:

The chirp rate in a territorial male cricket can be increased by playing chirps from a tape recorder. The increase is independent of the cricket's chirp rate before stimulation as long as the highest possible chirp rates are not yet reached (Figs. 5, 6, 8), but the size of the increase depends on the chirp rate of the stimulus used. After the end of stimulation the chirp rate returns exponentially to its previous level with a half Me of about 20 seconds.
A momentarily silent cricket is more likely to start chirping at the beginning of stimulation and less so after a few minutes of stimulation than would be expected without stimulation. The chirp rate reached in these cases is higher the sooner the cricket starts chirping during stimulation (Figs. 9, 10, 11). These regularities can easily be deduced by allowing the chirp activity to have negative values if no chirps occur (see discussion).

HEILIGENBERG, W., 'The stimulation of territorial singing in house crickets (Acheta domesticus)'. Journal of Comparative Physiology A: Neuroethology, Sensory, Neural, and Behavioral Physiology, vol. 53, nr. 2, juni 1966, blz. 114-129.

The following phenomena were found when chirps were played to a territorial male cricket:

  • A stimulus chirp not coinciding with a chirp of the cricket inhibits chirping from the 40th to the 180th msec following the onset of the stimulus.
  • It additively increases the chirp rate of the cricket by approximately 0.3 chirps/sec.
  • About 99% of this additive increment decays with a half life period of approximately 2 sec (phasic effect), the rest decays with a half life period of approximately 140 sec (tonic effect).
  • The effects of successive stimulus chirps are superimposed, however neither the phasic nor the tonic total increment ever passes a particular upper limit. If the total tonic increment becomes large enough, a previously silent cricket will start to chirp.
  • If chirps are played at a sufficiently high rate, the cricket tries to chirp in alternation.

HEILIGENBERG, W., 'The effect of stimulus chirps on a cricket's chirping (Acheta domesticus)'. Journal of Comparative Physiology A: Neuroethology, Sensory, Neural, and Behavioral Physiology, vol. 65, nr. 1, maart 1969, blz. 70-97.

The effect of acoustic signals on the control of chirp production has been investigated using the insect's own chirp to trigger artificial sound signals (100 msec, 7odB, 12 or 15 kHz) at predetermined phases of the chirp cycle. The signals appear to reset the phase of the chirp rhythm generator, and signals given late in the cycle are followed by the greatest phase shifts. The signals may also have excitatory after-effects which are usually small, but can summate to give a slow, longer lasting increase in chirp rate. This appears to happen during alternation with a natural or artificial partner.

JONES, M.D.R., 'The effect of acoustic signals on the chirp rhythm in the bush cricket Pholidoptera griseoaptera'. Journal of Experimental Biology, vol. 61, februari 1974, blz. 345-355.

Ik neem aan dat er geen verschil bestaat tussen nagebootst getsjirp en getsjirp van echte mannetjes. Mocht deze informatie voor een werkstuk zijn geweest, dan is dit antwoord uiteraard rijkelijk te laat, maar niettemin interessant als naslag.

Geloof niet alles wat je leest.

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