Odsjek za biologiju Prirodno-matematičkog fakulteta Univerziteta u Sarajevu
Zmaja od Bosne 33-35, 71.000 Sarajevo, Bosna i Hercegovina
Kašić-Lelo, M., Lelo, S.: Basic sexual characteristics and sex ratio in some Bosnian-Herzegovinian local populations of species Oxythyrea funesta Poda, 1761 (Coleoptera: Scarabaeidae, Cetoniinae). Prilozi fauni Bosne i Hercegovine, 1: 17-24. In this paper we examined male and female specimens of two chosen populations of Oxythyrea funesta Poda, 1761 from Sarajevo and Neum, Bosnia and Herzegovina.
Key words: Coleoptera, Cetoniidae, Cetoniinae, Oxythyrea, funesta, sex+ratio, evolucija, genetika
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Generally spoken, mechanism of genetic sex determination depends on existance of certain chromosome, which is present, both individual or as a pair, in majority of biparental organisms. By Coleoptera there has been detected six types of inheritance of sexes. The largest number of representatives include homogametic females and males that have only one X chromosome (♀♀ – XX, ♂♂ – X0). Standard drosophila type of inheritance comprises even four types of sexes inheritance, meaning heterogametic males, which are distinguished with unusual Y chromosome and its unique behaviour, for each of them, during meiosis. The most unusual is the last – sixth type of inheritance, quite often by representatives of suborder Adephaga, where one can find more than one sex chromosome.
Examination of the collected material has proved existance of clear morphological differences between sexes of species Oxythyrea funesta Poda, mainly on the ventral side of abdomen and development’s level of coges on first pair of legs.
On the basis of ahead said, we have came to the conclusion that analysis of forming and distribution of gonosomes in the gamets of parental generation, clearly affirms formation of exactly the same number of both male and female specimens in the F1 generation, which is 1:1 ratio.
Material analysis, of O. funesta Poda specimens, has proved that in its local populations from Sarajevo and Neum, as well as in whole sample, of course, prevalent were males. Precisely, in the sample from Sarajevo that has contained 1105 specimens, were detected following numerical values: 604 ♂♂ and 501 ♀♀, which is – 54,67% ♂♂ and 45,33% ♀♀, in the sample from Neum there were detected 80 ♂♂ and 30 ♀♀ or 72,73% ♂♂ and 27,27% ♀♀, meaning that total number of caught specimens was 1215, of which 684 were males or 56,30% and were 531 females or 43,70%.
Afore said leads us to the conclusion that sex ratio of species O. funesta Poda in the sample from southern Bosnia and Herzegovina is 1,29 : 1 in the benfit of males, meaning that sex ratio per analysed local populations amounts: Sarajevo – 1,21:1 and Neum – 2,67:1.
By comparing of perceived values for males and females with a method of hi-square (c2) test, it was established very high values of c2 = 9,60 for Sarajevo and for Neum c2 = 22,73, for whole sample c2 = 19,27, which proves that spotted differences between distribution’s frequences of males and females have statistical importance in every of three cases (Sarajevo 0,01>p>0,001, Neum p<0,001, total p<0,001).
Because of high statistical importance of spotted differences between males and females in local population from Neum, it was undertaken short analysis of certain morphological characteristics ( total length of the body, length of the right elitre, colour of the upper side of the body ) in the mentioned subsamples. It was established that females were, till some extent, larger than males, but that the range of variation of all attributes was equal, meaning that comparation for each attribute didn’t have statistical importance :
total length of the body – ♂♂ 9,00-11,20-13,00 mm, ♀♀ 9,50-11,70-13,00 mm,
length of the right elitre – ♂♂ 6,00-7,40-8,00 mm, ♀♀ 6,00-7,50-8,00 mm,
colour of the upper side of the body – ♂♂ 1,00-3,10-4,00, ♀♀ 1,00-2,10-4,00.