Dispersionsauslösende Proteine im Speichel mehrerer Schaben-Arten (Blattodea: Blattellidae, Blattidae, Blaberidae)
Fauldel, Michael; Fuchs, Manfred; Nagl, Walter
In regard to dispersion activity caused by proteinaceous substances in the saliva of Blattella germanica Linnaeus 1767 saliva of several cockroach species is studied concerning quantity, osmolality, pH-value and protein content. Mainly due to its low sodium content saliva turns out to be hypoosmotic against haemolymph. The pH-values are acidic in the saliva of German and American cockroaches, neutral or basic in the other species studies. The highest quantities of salivary proteins are found in B. germanica, further differentiated between sexes, nymphs and under defined stress conditions. The highest content is detected in the saliva of overcrowded ♀♀ carrying an ootheca. The stress of overcrowding rapidly increases the protein content to a threefold amount. According to literature, the saliva of overcrowded ♀♀ with ootheca acts as a dispersal. The communicative effect of salivary proteins is confirmed by the results herewith presented.