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From an ecosystem perspective, this fish species is interesting as it is known to feed on surface insects, thereby linking the terrestrial with the aquatic habitat. In a previous study, we demonstrated that this flux is intensified, and dietary contribution of terrestrial insects is higher in fish inhabiting sections of the Spree River, Germany, that are polluted from iron oxides occurring from former lignite mining activities, and thus are characterized by lower abundances of aquatic insects. As terrestrial insects can be considered as food of lower quality (measured as long\u2010chained polyunsaturated fatty acids, n\u20103 LC\u2010PUFAs) compared to aquatic prey, it is reasonable to assume that the higher contribution of terrestrial insects is related to a lower body condition in fish. In this study, we explore the trophic ecology of riverine <jats:italic>A<\/jats:italic>. <jats:italic>alburnus<\/jats:italic> and their fitness consequences of feeding on terrestrial insects. We therefore modeled a terrestrial index from stable isotopes of hydrogen (\u03b4<jats:sup>2<\/jats:sup>H) measured in the <jats:italic>A<\/jats:italic>. <jats:italic>alburnus<\/jats:italic> muscle tissue and compared individuals caught in locations upstream of a dam that were greatly influenced by iron oxides, with individuals caught in sections located downstream of a dam where passive remediation technologies are applied. The terrestrial index was significantly higher in <jats:italic>A<\/jats:italic>. <jats:italic>alburnus<\/jats:italic> caught in locations at high\u2010iron concentrations, characterized by low abundances of aquatic prey, compared to <jats:italic>A<\/jats:italic>. <jats:italic>alburnus<\/jats:italic> caught in unpolluted habitats at low\u2010iron concentrations. In contradiction to our hypothesis, the terrestrial index had no significant effect on the body condition of <jats:italic>A<\/jats:italic>. <jats:italic>alburnus<\/jats:italic> (measured as Fulton's condition factor <jats:italic>K<\/jats:italic>) in the sections downstream of the dam (i.e., at low\u2010iron concentrations) and a significant positive, albeit weak, effect in sections upstream of the dam (i.e., at high\u2010iron concentrations). However, the condition factor was generally lower in the high\u2010iron section, potentially related to more direct effects of the iron oxide. We conclude that in <jats:italic>A<\/jats:italic>. <jats:italic>alburnus<\/jats:italic>, terrestrial insects can be considered as the less\u2010favored food, unless the fish occur in environments where the aquatic food is of limited availability. Further research is needed to evaluate the direct and indirect effects, including the internal n\u20103 LC\u2010PUFA synthesis as an adaption toward low\u2010quality terrestrial prey on the fitness consequences of <jats:italic>A<\/jats:italic>. <jats:italic>alburnus<\/jats:italic>.<\/jats:p>","DOI":"10.1111\/jfb.15835","type":"journal-article","created":{"date-parts":[[2024,6,6]],"date-time":"2024-06-06T05:23:58Z","timestamp":1717651438000},"page":"1445-1454","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Influence of the dietary contribution of terrestrial insects to the condition factor of bleak <scp><i>Alburnus alburnus<\/i><\/scp> in a highly polluted lowland river"],"prefix":"10.1111","volume":"105","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2858-5947","authenticated-orcid":false,"given":"Kristin","family":"Scharnweber","sequence":"first","affiliation":[{"name":"Plant Ecology and Nature Conservation University of Potsdam  Potsdam Germany"},{"name":"Ecological Research Station University of Cologne  Rees Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stefania","family":"Milano","sequence":"additional","affiliation":[{"name":"Evolutionary Ecology  Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel","family":"H\u00fchn","sequence":"additional","affiliation":[{"name":"Potsdam Institute of Inland Fisheries  Potsdam Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,6,5]]},"reference":[{"key":"e_1_2_9_2_1","first-page":"34","article-title":"Experiments with brown trout (Salmo trutta L.) during spring in mountain streams at low pH and elevated levels of iron, manganese and aluminium","volume":"61","author":"Andersson P.","year":"1984","journal-title":"Report\u2010Institute of Freshwater Research, Drottningholm"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1139\/f02-166"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2427.2004.01328.x"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00015532"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1146\/annurev-ecolsys-102209-144726"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/ecy.2211"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/1365-2656.13142"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.est.6b01911"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1577\/1548-8659(1990)119<0673:GARSOC>2.3.CO;2"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00442-020-04668-y"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jhydrol.2023.129817"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1890\/06-1184"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1002\/lno.12500"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00767-020-00452-0"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.scitotenv.2020.143942"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1098\/rstb.2019.0638"},{"key":"e_1_2_9_18_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2427.1992.tb00524.x"},{"key":"e_1_2_9_19_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0145154"},{"key":"e_1_2_9_20_1","doi-asserted-by":"publisher","DOI":"10.1139\/f93-230"},{"key":"e_1_2_9_21_1","doi-asserted-by":"publisher","DOI":"10.1139\/er-2015-0029"},{"key":"e_1_2_9_22_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1095-8649.1978.tb03443.x"},{"key":"e_1_2_9_23_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0044-8486(01)00581-6"},{"key":"e_1_2_9_24_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.scitotenv.2022.155982"},{"key":"e_1_2_9_25_1","doi-asserted-by":"publisher","DOI":"10.4141\/cjss2010-063"},{"key":"e_1_2_9_26_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11160-023-09767-6"},{"key":"e_1_2_9_27_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2427.2011.02690.x"},{"key":"e_1_2_9_28_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1461-0248.2008.01235.x"},{"key":"e_1_2_9_29_1","doi-asserted-by":"publisher","DOI":"10.2307\/1468356"},{"key":"e_1_2_9_30_1","doi-asserted-by":"publisher","DOI":"10.4319\/lo.2005.50.6.2022"},{"key":"e_1_2_9_31_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cbpb.2014.11.003"},{"key":"e_1_2_9_32_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.98.1.166"},{"key":"e_1_2_9_33_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10641-004-1263-8"},{"key":"e_1_2_9_34_1","first-page":"189","article-title":"Trophic plasticity of omnivorous fishes in natural and human\u2010dominated landscapes","volume":"69","author":"Neves M. 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