Fluctuating asymmetry in diploid female and sterile triploid rainbow trout (Oncorhynchus mykiss) | Fluktuacijska asimetrija pri diploidnih in sterilnih triploidnih samicah kalifornijske postrvi (Oncorhynchus mykiss)

anglais. Viability of an organism and possibility to survive in natural environment could be judged by the magnitude of fluctuating asymmetry (FA) which is defined as random deviation from perfect symmetry of an organism. In order to estimate if there is the difference in FA between diploid female and sterile triploid rainbow trout (Oncorhynchus mykiss) the number of rays in pelvic and pectoral fins was determined on both sides of body in 150 individuals from two populations which were of the same genetic origin and were reared under same farm conditions. Units of asymmetry were determined as the absolute value of difference between counts on both sides of body. Results indicate that diploids exhibit larger FA than triploids in both traits; however the difference between both populations is statistically significant only if the number of units of asymmetry for both traits for each fish is summed up. The need to estimate the viability of these two populations on the basis of other traits is discussed and the necessity to use the metric traits to determine FA is stressed out.

slovène. Vitalnost nekega organizma in verjetnost, da preživi v naravi, je mogoče presojati na podlagi velikosti fluktuacijske asimetrije (FA). Ta je določena s tem, koliko telo določenega osebka odstopa od popolne simetrije. Da bi ocenili ali se samice in sterilni triploidni osebki kalifornijske postrvi (Oncorhynchus mykiss) med seboj razlikujejo v FA, smo pri 150 osebkih iz obeh populacij določili število plavutnic v prsnih in trebušnih plavutih na obeh straneh telesa. Kot mero za asimetrijo smo uporabili absolutno razliko v številu plavutnic v prsnih in trebušnih plavutih, na vsaki strani telesa. Rezultati kažejo, da je za obe lastnosti FA večja pri diploidnih osebkih; razlika med populacijama je dovolj velika, da jo lahko štejemo kot statistično značilno le, če obe lastnosti obravnavamo združeno. Delo problematizira možnost presojanja sposobnosti preživetja le na osnovi FA in poudarja, da bi bilo nujno za določanje FA uporabiti metrične lastnosti.