Persistent organic pollutants in river food webs: influence of trophic position and degree of heterotrophy

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Abstract:

We investigated how the degree of autotrophy/heterotrophy and organism trophic position influenced the bioaccumulation of polychlorinated biphenyls (PCBs) in 10 benthic river food webs consisting of terrestrial detritus, periphyton, invertebrates, and age-0 brown trout (Salmo trutta) in southern Sweden. Concentrations of PCBs increased with trophic position, estimated from 15N and 13C, on a dry weight basis (ng·g–1 dry weight) but not on a lipid weight basis (ng·g–1 lipid). PCB biomagnification factors between the first and second trophic levels (invertebrates/ periphyton and invertebrates/detritus) ranged between 0.3 and 2.3 and between the second and third levels (trout/invertebrates) between 0.3 and 2.0 on a lipid weight basis. The mean proportion of carbon ultimately derived from terrestrial sources, α, was 0.82 ± 0.19 for invertebrates and 0.67 ± 0.28 for trout. Contrary to our hypothesis, PCB concentrations in trout were positively related to α (r2 = 0.58–0.77, p < 0.05). As α and the periphyton density (g C·m–2) in the rivers was positively related (r2 = 0.88, p < 0.01), we propose that this relationship was due to an increased retention and exposure of PCBs to trout in rivers with low grazing pressure and high periphyton density.

Nous avons déterminé dans quelle mesure le degré d'autotrophie/hétérotrophie et la position trophique des organismes influencent la bioconcentration des biphényls polychlorés (BPC) dans 10 réseaux alimentaires benthiques de rivière comprenant le détritus terrestre, le périphyton, les invertébrés et les truites brunes (Salmo trutta) d'âge 0 dans le sud de la Suède. Les concentrations de BPC augmentent en fonction de la position trophique lorsqu'elles sont estimées à partir de 15N et de 13C en masse sèche (ng·g–1 de masse sèche), mais pas en masse lipidique (ng·g–1 de lipides). Les facteurs de bioamplification (BMF) entre les premier et second niveaux trophiques (invertébrés/périphyton et invertébrés/détritus) varient de 0,3 à 2,3 et entre les second et troisième niveaux (truite/invertébrés) de 0,3 à 2,0 sur la base de la masse lipidique. La proportion moyenne de carbone dérivée en fin de compte des sources terrestres, α, est de 0,82 ± 0,19 chez les invertébrés et de 0,67 ± 0,28 chez les truites. Contrairement à notre hypothèse, les concentrations de BPC chez la truite sont en corrélation positive avec α (r2 = 0,58–0,77, p < 0,05). Comme α est relié directement (r2 = 0,88, p < 0,01) à la densité du périphyton (g C·m–2) dans les rivières, nous croyons que cette relation est due à une rétention accrue et une exposition plus grande des BPC chez les truites dans les rivières à faible pression de broutage et à forte densité de périphyton.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: September 1, 2005

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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