Abstract
Median levels of Coproporphyrin III (Copro III) in fecal samples of river otters ( Lontra canadensis) collected from an oiled area in Prince William Sound, Alaska, USA, during 1990 were significantly higher than in samples collected from the same oiled area during 1996 ( p=0.011, one way analysis of variance), a nonoiled reference area in Prince William Sound during 1996 ( p=0.002) and a reference area in southeast Alaska during 1998 ( p=0.004). An overall test of significance that combined probabilities from the statistical analysis of this porphyrin study with those from other biomarker studies revealed a significant difference in physiological response of river otters between oiled and nonoiled areas of the Sound for 1990 ( p < 0.01). We demonstrated that changes in levels of fecal porphyrins may serve as a biomarker that may contribute to a health assessment of wild river otters.
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