All fulmar dissections were performed in
the laboratory following a standard protocol.37 ,38 During the dissections, the depth of the subcutaneous fat layer
between the pectoral muscle and the skin was measured at its deepest
with the depth rod of a vernier caliper. For this, the fat tissue
was separated from the muscle tissue and kept attached to the skin
on the side where it was measured. The gastrointestinal tracts (GITs)
were dissected from the esophagus to the anus, along with several
tissue samples for ecotoxicological research (not presented in this
paper). New scalpel blades and gloves were used for each bird, and
the tools were rinsed using soap, Milli-Q water, and ethanol.
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