Spolni dimorfizem in določitev spola na osnovi morfometričnih meritev pri lokalno prilagojeni muškatni raci (Cairina moschata) v Nigeriji

Abel Olusegun OGUNTUNJI, Kolawole Luke AYORINDE

Povzetek


Spolni dimorfizem telesne velikosti (SDTV) je splošen pojav pri večini vrst sesalcev in perutnine. To študijo smo zasnovali z namenom, da bi proučili SDTV pri doslej neopisani, na lokalne razmere prilagojeni muškatni raci v Nigeriji s pomočjo opisne analize, indeksa spolnega dimorfizma (ISD), indeksa spolnega dimorfizma telesne velkosti (ISDTV) in analize glavnih komponent variance morfoloških lastnosti. Poskušali smo tudi določiti morfološke lastnosti z največjo napovedno vrednostjo za določitev spola z večstopenjsko diskriminantno analizo. Podatke o desetih morfoloških lastnostih: telesna masa, obseg telesa, dolžina telesa, dolžina krill, dolžina goleni, obseg goleni, dolžina stegna, dolžina noge, dolžina kljuna in širina kljuna, smo zbrali pri 1.020 muškatnih racah iz ekstenzivne reje, med katerimi je bilo 287 samcev in 733 samic. Ptice smo vzorčili naključno v agro-ekoloških conah deževnega gozda, degradirane in gvinejske savane v Nigeriji. Spol statistično značilno (p < 0,001) vpliva na morfometrične lastnosti. Analiza relativnega doprinosa posameznih morfoloških lastnosti k SDTV preko ISD in ISDTV je pokazala, da se telesna masa in lastnosti povezane s telesnim okvirjem (dolžina telesa in dolžina kril) najbolj razlikujejo med spoloma. Za vsak spol smo izbrali tri glavne komponente, ki pojasnjujejo največji delež variance pri moških in ženskih živalih. Upoštevaje ISD in ISDTV je večstopenjska diskriminantna analiza pokazala telesno maso kot lastnost z najboljšo napovedno vrednostjo za spol pri odraslih muškatnih racah, sledita pa dolžina telesa in dolžina krill, na osnovi katerih lahko z 98,5 % gotovostjo napovemo spol živali. Sistem za presojo spolnega dimorfizma telesne velikosti, ki smo ga vzpostavili v tej študiji, je primeren za uporabo v selekcijskih programih za izboljšanje lastnosti muškatne race.

Ključne besede


race; muškatna raca; Cairina moschata; spol; velikost; dimorfizem; morfometrične lastnosti; Nigerija

Celotno besedilo:

PDF (English)

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DOI: http://dx.doi.org/10.14720/aas.2014.104.1.2

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