Access Restriction

Author Bortolotti, G. R. ♦ Smits, J. E. G.
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Organochlorine Contamination ♦ Tree Swallow ♦ Nestling Tree Swallow ♦ Physiological Response ♦ Point Pelee National ♦ Many Bird ♦ Point Pelee National Park ♦ Southwestern Ontario ♦ Tachycineta Bicolor ♦ Vital Breeding Area ♦ Resident Specie ♦ Pcb Level ♦ Oconnor Associate Environmental ♦ Reproductive Success ♦ Detectable Physiologic Change ♦ Liver Size ♦ Protein Level ♦ Psedacris Crucifer ♦ Localized Area ♦ Major Migratory Route ♦ Important Migratory Route ♦ Persistent Contaminant ♦ Breeding Season ♦ High Residue ♦ Biologic Effect ♦ Limited Period ♦ Environmental Stress ♦ Insect Prey ♦ Pentoxyresorufin-o-dealkylase Enzyme Activity ♦ Food Web ♦ Park Boundary ♦ Oc Contamination ♦ Northern Spring Peeper ♦ Body Burden ♦ Tissue Oc Contaminant Level ♦ Hepatic Ethoxy
Abstract Abstract. Point Pelee National Park in southwestern Ontario, Canada—a major migratory route and vital breeding area for many birds—has localized areas of organochlorine (OC) contamination from the 1950s and 1960s. During 2002, we investigated the effect of tissue OC contaminant levels on the physiology and growth of nestling tree swallows (Tachycineta bicolor). Polychlorinated biphenyl (PCB) contamination in the nestlings positively correlated with hepatic ethoxy-, benzyl-oxy-, and pentoxyresorufin-o-dealkylase enzyme activities and liver size. Despite detectable physiologic changes associated with body burdens of PCBs, reproductive success of breeding pairs was not affected. Hatching date was negatively correlated with PCB levels, alkoxyresorufin-O-dealkylase (alkROD) activities, liver size, and serum protein levels. alkROD activ-ities were largely dependent on hatching date because insect prey contaminated with PCBs were only abundant during a limited period of time during the breeding season. Point Pelee National Park (PPNP) in southwestern Ontario, Canada is an important migratory route and vital breeding area for many birds. Within the park boundaries there are localized areas of organochlorine (OC) contamination from agrochem-icals used during the 1950s and 1960s (OConnor Associates Environmental 2001). OC contamination in the park was first recognized when high residues were detected in northern spring peepers (Psedacris crucifer) (Russell et al. 1995), but the impact on other resident species was not explored. During 2001 and 2002, the distribution of persistent contaminants in the food web was tracked using the tree swallow (Tachycineta bicolor) as a bioindicator (Smits et al. 2004). Tree swallows have been widely studied to document the biologic effects of anthropogenically imposed environmental stress (McCarty 2001; Custer et al. 2001a; Smits et al. 2000;
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Learning Resource Type Article
Publisher Date 2004-01-01