In:
Environmental Toxicology and Chemistry, Wiley, Vol. 26, No. 7 ( 2007-07), p. 1386-1398
Abstract:
The great horned owl (GHO; Bubo virginianus ) was used in a multiple lines of evidence study of polychlorinated biphenyls (PCBs) and p,p ′‐dichlorodiphenyltrichloroethane (DDT) exposures at the Kalamazoo River Superfund Site (KRSS), Kalamazoo, Michigan, USA. The study examined risks from total PCBs, including 2,3,7,8‐tetrachlorodibenzo‐ p ‐dioxin equivalents (TEQ World Health Organization [WHo‐Avian Toxicity Equivalency Factor [TEF] , and total DDTs (sum of DDT, dichlorodiphenyldichloroethylene [DDE], and dichlorodiphenyldichloroethane [DDD] ; ΣDDT) by measuring concentrations in eggs and nestling blood plasma in two regions of the KRSS (upper, lower) and an upstream reference area (RA). An ecological risk assessment compared concentrations of the contaminants of concern (COCs) in eggs or plasma to toxicity reference values. Productivity and relative abundance measures for KRSS GHOs were compared with other GHO populations. Egg shell thickness was measured to assess effects of p,p ′‐DDE. The concentrations of PCBs in eggs were as great as 4.7 × 10 2 and 4.0 × 10 4 ng PCB/g, wet weight at the RA and combined KRSS sites, respectively. Egg TEQ WHo‐Avian calculated from aryl hydrocarbon receptor–active PCB congeners and WHO TEFs ranged to 8.0 and 1.9 × 10 2 pg TEQ WHO‐Avian /g, (wet wt) at the RA and combined KRSS, respectively. Egg ΣDDT concentrations were as great as 4.2 × 10 2 and 5.0 × 10 3 ng ΣDDT/g (wet wt) at the RA and combined KRSS, respectively. Hazard quotients (HQs) for the upper 95% confidence interval (UCI) (geometric mean) and least observable adverse effect concentration (LOAEC) for COCs in eggs were ≤1.0 for all sites. Hazard quotient values based on the no observable adverse effect concentration (NOAEC) 95% UCI in eggs were ≤1.0, except at the LKRSS (PCB HQ = 3.1; TEQ WHO‐Avian HQ = 1.3). Productivity and relative abundance measures indicated no population level effects in the UKRSS.
Type of Medium:
Online Resource
ISSN:
0730-7268
,
1552-8618
Language:
English
Publisher:
Wiley
Publication Date:
2007
detail.hit.zdb_id:
2027441-5
SSG:
12
Bookmarklink