oglašanje škržata
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Ponavadi dobim na tem forumu vse možne odgovore, zato poskušam tudi tokrat.
Zanima me, če veste kako povzročajo glas žuželke – škržati, ki jih ponavadi srečamo v toplih krajih, na morju.
Kot se jaz spomnim, smo vedno govorili, da si drgnejo nogice, sedaj pa sva s sodelavko stavili – ona trdi, da tako globoko dihajo, da se s tem hladijo.
Mogoče kdo ve?
http://en.wikipedia.org/wiki/Cicada
Cicada song
Male cicadas have loud noisemakers called “timbals” on the sides of the abdominal base. Their “singing” is not the stridulation (where two structures are rubbed against one another) of many other familiar sound-producing insects like crickets: the timbals are regions of the exoskeleton that are modified to form a complex membrane with thin, membranous portions and thickened “ribs”. Contracting the internal timbal muscles produces a clicking sound as the timbals buckle inwards. As these muscles relax, the timbals return to their original position producing another click. The interior of the male abdomen is substantially hollow to amplify the resonance of the sound. A cicada rapidly vibrates these membranes, and enlarged chambers derived from the tracheae make its body serve as a resonance chamber, greatly amplifying the sound. They modulate their noise by wiggling their abdomens toward and away from the tree that they are on. Additionally, each species has its own distinctive song.[1]
Jasno, google ve.KRatkop povedano: glede na stavek spodaj nobena nima prav.
Na strani http://www.cicadasong.eu/ piše: “As it is well known, in singing cicadas only males have characteristic sound producing organs – tymbals and are able to produce loud and species specific sound signals.”
Hja … s stridulacijo (drgnjenjem), kot jo poznamo pri čričkih in kobilicah zagotovo ne. Pa tudi globoko ne more dihat, ker nima pljuč, temveč so škržati insekti, ti pa dihajo prek vzdušnic – trahej.
Ni mi čisto jasen sistem, vendar zvok proizvajajo z membranami, traheje pa jim služijo za resonančni prostor.
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