| Autor: |
Carravieri A; School of Environmental Sciences, University of Liverpool, Liverpool L69 3GP, U.K., Burthe SJ; UK Centre for Ecology & Hydrology, Bush Estate, Penicuik EH26 0QB, U.K., de la Vega C; School of Environmental Sciences, University of Liverpool, Liverpool L69 3GP, U.K., Yonehara Y; Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Chiba 277-8564, Japan., Daunt F; UK Centre for Ecology & Hydrology, Bush Estate, Penicuik EH26 0QB, U.K., Newell MA; UK Centre for Ecology & Hydrology, Bush Estate, Penicuik EH26 0QB, U.K., Jeffreys RM; School of Environmental Sciences, University of Liverpool, Liverpool L69 3GP, U.K., Lawlor AJ; UK Centre for Ecology & Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, Lancaster LA1 4AP, U.K., Hunt A; UK Centre for Ecology & Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, Lancaster LA1 4AP, U.K., Shore RF; UK Centre for Ecology & Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, Lancaster LA1 4AP, U.K., Pereira MG; UK Centre for Ecology & Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, Lancaster LA1 4AP, U.K., Green JA; School of Environmental Sciences, University of Liverpool, Liverpool L69 3GP, U.K. |
| Abstrakt: |
Environmental contaminants and parasites are ubiquitous stressors that can affect animal physiology and derive from similar dietary sources (co-exposure). To unravel their interactions in wildlife, it is thus essential to quantify their concurring drivers. Here, the relationship between blood contaminant residues (11 trace elements and 17 perfluoroalkyl substances) and nonlethally quantified gastrointestinal parasite loads was tested while accounting for intrinsic (sex, age, and mass) and extrinsic factors (trophic ecology inferred from stable isotope analyses and biologging) in European shags Phalacrocorax aristotelis . Shags had high mercury (range 0.65-3.21 μg g -1 wet weight, ww) and extremely high perfluorooctanoic acid (PFOA) and perfluorononanoic acid (PFNA) residues (3.46-53 and 4.48-44 ng g -1 ww, respectively). Males had higher concentrations of arsenic, mercury, PFOA, and PFNA than females, while the opposite was true for selenium, perfluorododecanoic acid (PFDoA), and perfluooctane sulfonic acid (PFOS). Individual parasite loads ( Contracaecum rudolphii ) were higher in males than in females. Females targeted pelagic-feeding prey, while males relied on both pelagic- and benthic-feeding organisms. Parasite loads were not related to trophic ecology in either sex, suggesting no substantial dietary co-exposure with contaminants. In females, parasite loads increased strongly with decreasing selenium:mercury molar ratios. Females may be more susceptible to the interactive effects of contaminants and parasites on physiology, with potential fitness consequences. |
