Respiration rate and respiratory electron transport system (ETS) activity of chironomid larvae from mountain lakes (NW Slovenia) | Stopnja dihanja in aktivnost dihalnega elektronskega transportnega sistema (ETS) pri licinkah trzac iz gorskih jezer (SZ Slovenija)

English. Respiration rate (R) and electron transport system (ETS) activity were measured in larvae of four chironomid species, Chironomus thummi (Kieffer), Paratanytarsus austriacus (Kieffer), Procladius (Holotanypus) spp., and Zavrelimyia barbatipes (Kieffer) from three mountain lakes. ETS activity and res­ piration rate, measured at a standard temperature of 20 °C, differed significantly between species (ANOVA: p<0.001). ETS activity ranged from 10.3 µL 02 mg-1 DW h-1 for Zavrelimyia to 27.6 µL 02 mg1DW h-1 for Paratanytarsus. The lowest respiration rate was observed for Procladius (4.0 µL 02 mg·1DW h-1) and the high­ est for Paratanytarsus (12.4 µL 02 mg·1DW h-1). ETS activity and respiration rate of chironomids decreased with increasing size of the animals (p<0.001); b values for ETS activity and respiration rate were 0.82 and 0.66, respectively. Respiration rate correlated significantly with ETS activity for all four species investigated. This study revealed that the ETS/R ratio differed between species (ANOVA: p<0.001). A low ratio (0.98) was determined for Zavrelimyia, while Procladius showed the highest value (3.88). The differences can be explained by body size, and the eco­ logical preference and tolerance of each chironomid species.

Slovenian. Stopnjo dihanja in aktivnost elektronskega transportnega sistema (ETS) smo dolocali pri licinkah stirih razlicnih vrst trzac, Chironomus thummi (Kieffer), Paratanytarsus austriacus (Kieffer), Procladius (Holotanypus) spp., in Zavrelimyia barbatipes (Kieffer), ki smo jih nalovili v treh gorskihjezerih. Aktivnost ETS in stopnja dihanja, ki smo ju merili pri standardni temperaturi 20 °C, sta se znacilno razlikovali med vrstarni (ANOVA: p<0.001). Aktivnost ETS se je gibala med 10.3 µL 02 mg·1DW h·1 pri licinkah Zavrelimyia in 27.6 µL 02 mg-I DW h·1 pri licinkah Paratanytarsus. Najnizjo stopnjo dihanja smo dolocili pri licinkah Procladius (4.0 µL 02 µL 02 mg·1DW h-1), najvisjo pa pri licinkah Paratanytarsus (12.4 µL µL 02 mg·1DW h-1). Aktivnost ETS in stopnja dihanja licink sta se zmanjsevali z narascajoco velikostjo zivali (p<0.001); vrednosti b sta znasali 0.82 za aktivnost ETS in 0.66 za dihanje. Opazili smo pozitivno korelacijo med stopnjo dihanja in aktivnos­ tjo ETS pri vseh stirih vrstah. Raziskava je pokazala znacilne razlike v razmerju ETS/R med vrsta­ mi (ANOVA: p<0.001). Nizko razmerje (0.98) je bilo doloceno pri licinkah 'Zavrelimyia, medtem ko je bilo pri licinkah Procladius doloceno najvisje razmerje (3.88). Razlicna razmerja so posledica raz­ lik v vrstno-specificni telesni velikosti ter razlicne ekoloske preference in tolerance pri posamezni vrsti trzac.