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Pruszków, Poland

Goncharov A.A.,RAS Severtsov Institute of Ecology | Zalewski M.,Polish Academy of Sciences | Dudek-Godeau D.,Al. Armii Krajowej 32 19 | Godeau J.-F.,Cardinal Stefan Wyszynski University in Warsaw | And 3 more authors.
Pedobiologia | Year: 2015

Intersexual differences in food preferences and patterns of nutrient allocation are well known for a variety of animals, but this factor is not taken into account in the stable isotope-based studies of soil food webs. We used stable isotope composition of carbon and nitrogen (δ13C and δ15N values) to address the intersexual differences in the trophic niche of 27 species of ground beetles sampled in Northern Poland and Western Russia. Despite a high level of intra- and interspecies variation, males were, on average, enriched in 15N relative to females by 0.5±0.1‰. Observed enrichment was most pronounced among species with high δ15N values and among spring breeding species collected in June. We did not find significant sex-related differences in δ13C values. Our results indicate sex-specific patterns in resource allocation or foraging behavior of predatory Carabidae during the breeding season. © 2015. Source

Zalewski M.,Polish Academy of Sciences | Dudek-Godeau D.,Al. Armii Krajowej 32 19 | Tiunov A.V.,RAS A.N. Severtsov Institute of Ecology and Evolution | Godeau J.-F.,Cardinal Stefan Wyszynski University in Warsaw | And 4 more authors.
European Journal of Entomology | Year: 2015

As movement is expensive in terms of energy required, mobile animals might have to utilize more energy rich resources than less mobile animals. As mobile animals are possibly more effective foragers we hypothesize a positive correlation between mobility and trophic niche width. We address this link using information on the trophic level of 35 winged, wingless and wing dimorphic species of ground beetles studied on 18 lake islands and at two mainland sites in northern Poland. Trophic analyses using stable isotope values (δ15 N, δ13C) revealed that winged individuals of wing dimorphic species are characterized by broader isotopic niches than wingless individuals. Macropterous species are characterized by depleted 7δ13C values, which can be interpreted in terms of lipid-rich prey selection. Wing dimorphic species are characterized by higher trophic levels, as inferred from δ15 N values, than winged species. Numbers of islands colonized by particular species were not correlated with δ15 N values, δ13C values or isotopic niche width. Our results point to a relationship between diet and wing morphology in ground beetles. Source

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