Abstract
Parasites that are transmitted through predator–prey interactions may be used as indicators of trophic relationships between organisms. Yet, they are rarely used as such in the construction of topological (predator–prey) food webs. We constructed food webs of vertebrate trophic interactions using observed diet alone, trophically transmitted parasites alone, and the combination of the two based on data from 31 species of fish from the Bothnian Bay, Finland. The fish food web contained 530 links derived from observed diet, 724 links inferred from parasitism, and 1,058 links calculated from a combination of both stomach contents and parasites. This sub-web constructed from stomach contents had a mean of 17.1 links per fish species, while that using parasites had 23.4 links per fish. Combining the two diet indicators yielded 34.1 links per fish species, illustrating the complementarity of the two methods. Mean number of prey species per fish species was 12.5 using observed diet items, 15.8 using parasites, and 24.5 using both measures together. Mean number of predators per fish species was 7.4 using observed diet, 11.7 using parasites and 15.0 using both. A positive correlation was found between the mean number of parasites and the number of prey taxa in the diet among the fishes. Omnivorous fish had the highest diversity of both parasite species and prey items, while benthophagous fish had among the lowest. Mean total abundance and mean total prevalence of parasites correlated positively with fish size, with piscivores being the largest with the highest abundance and prevalence, while planktivores and benthivores had the lowest. Trophically transmitted parasites may be used to help construct vertebrate sub-webs and derive information about food web processes. Parasites alone provided equivalent if not more information than observed diet. However, resolution is improved by using parasites and observed diet together.
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Acknowledgments
The senior author benefitted from many discussions on the composition of the free-living fauna of the Bothnian Bay with Kalevi Kuusela, Pertti Tikkanen, Jukka Särkkä, Jukka Jokela, Eino Merilä, Jyrki Mäkelä and Tapani Valtonen. This study is a contribution of the Working Group on Parasites and Food Webs of the National Center for Ecological Analysis and Synthesis, of which D. J. M. is a participant. Treatment of animals complies with the laws of Finland. We thank Jenny Cook for proofreading the manuscript and Dr Teija Hakalahti-Siren and Mr Tobias Halfar for technical help with figures. Lastly, we gratefully acknowledge the comments of four anonymous reviewers, and one in particular who clarified a number of pertinent food web issues, that substantially improved the manuscript.
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Communicated by Ulrich Sommer.
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Valtonen, E.T., Marcogliese, D.J. & Julkunen, M. Vertebrate diets derived from trophically transmitted fish parasites in the Bothnian Bay. Oecologia 162, 139–152 (2010). https://doi.org/10.1007/s00442-009-1451-5
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DOI: https://doi.org/10.1007/s00442-009-1451-5