Hair is used to determine trace elements exposure and status of pinnipeds because it is an excretory route
for many elements and can be collected non-lethally. Despite increased use, there have been few studies
on how sampling designs and procedures (e.g., hair type, collection site) affect results. The objective of
this study was to determine whether concentrations of an essential (selenium; Se) and non-essential element
(mercury; Hg) differed between hair samples collected from two body locations on harbor seals
(Phoca vitulina). Concentrations of Se and total Hg (THg) differed between mid-dorsal midline and neck
samples, and although the absolute differences were relatively small (Dabsolute Se = 0.69 lg g1, Dabsolute
THg = 2.86 lg g1), the relative differences were large (Drelative Se = 49%, Drelative THg = 17%). These differences
highlight the need to standardize the collection site for trace element determination in pinnipeds.
Hair is used to determine trace elements exposure and status of pinnipeds because it is an excretory routefor many elements and can be collected non-lethally. Despite increased use, there have been few studieson how sampling designs and procedures (e.g., hair type, collection site) affect results. The objective ofthis study was to determine whether concentrations of an essential (selenium; Se) and non-essential element(mercury; Hg) differed between hair samples collected from two body locations on harbor seals(Phoca vitulina). Concentrations of Se and total Hg (THg) differed between mid-dorsal midline and necksamples, and although the absolute differences were relatively small (Dabsolute Se = 0.69 lg g1, DabsoluteTHg = 2.86 lg g1), the relative differences were large (Drelative Se = 49%, Drelative THg = 17%). These differenceshighlight the need to standardize the collection site for trace element determination in pinnipeds.
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