Population ecology ofPimelodella kronei, troglobitic catfish from Southeastern Brazil (Siluriformes, Pimelodiae)

摘要: Pimelodella kronei, a cave derivative of the pimelodid catfishP. transitoria, has been found in five caves Ribeira River valley, SE Brazil. I investigated ecology most conspicuous population, that from Areias Caves, by capture-mark-recapture. During two-year study, 170 specimens ofP. kronei were marked, 81 recaptured at least once, multiple recaptures frequent. These blind catfishes tended to be same site where they suggesting sedentary life and possibly territoriality. The home range was 200 m along stream, or more food scarcer.P. population size 800 permanent stream 150–200 individuals.P. transitoria also inhabits cave, density ten times lower. growth rate less than 0.1 cm × month−1, longevity 10–15 years. data, evidences an infrequent reproduction, indicate K-selected cycle, probably as consequence scarcity.