| biomonitoring heavy metals using the barn owl (tyto alba guttata): sources of variation especially relating to body condition. | the feasibility of using the barn owl (tyto alba guttata) to monitor environmental quality in the netherlands was investigated, using cd, cu, pb, mn, and fe as indicators for environmental contamination. throughout 1992, bird-watchers, volunteers, and officials submitted 53 birds. the age and geographical distribution of these birds, formed a representative sample of the population. the following interrelationships were investigated: cause of death, nutrient reserve, age, time of death, place of ... | 1995 | 7755402 |