caa a22 4500 445892838 CHVBK 20180317145622.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10750-010-0582-3 doi (NATIONALLICENCE)springer-10.1007/s10750-010-0582-3 First feeding diet of young brown trout fry in a temperate area: disentangling constraints and food selection [Elektronische Daten] [Javier Sánchez-Hernández, Rufino Vieira-Lanero, María Servia, Fernando Cobo] Diet composition of newly emerged brown trout fry in natural areas remains poorly known, and foraging abilities at this early stage, although presumably reduced, are still under discussion. We have studied gut content composition of brown trout fry in a temperate area (Galicia, NW Spain) and compared it to the benthic macroinvertebrate community. Small prey such as chironomid larvae and baetid nymphs were the most important food items for newborns, some of them still presenting yolk remnants. However, the positive selection observed for Polycentropodidae and Simuliidae and the rejection of Elmidae and Leuctricidae suggest that other factors apart from size, such as locomotor abilities of fish or accessibility and antipredator behaviour of prey play an important role in feeding behaviour. Additionally, analysis of diet changes on the studied fry suggests a dramatic shift in niche breadth at the moment of complete yolk absorption, which might be related to the improvement of swimming and handling ability of fry for capturing and ingesting prey. The presence of aerial imagoes only in the stomachs of fry with no yolk provides further support to this hypothesis. Planning of restoration works on spawning grounds should then allow enough time for complete recolonization by benthic macroinvertebrates, including first instars, as searching for food in newborns is limited to the nest area due to mobility constraints. Springer Science+Business Media B.V., 2010 Brown trout nationallicence Fry nationallicence First feeding nationallicence Diet nationallicence Yolk resorption nationallicence Foraging abilities nationallicence Sánchez-Hernández Javier Departamento de Zoología y Antropología Física, Universidad de Santiago de Compostela, Campus Sur s/n, 15782, Santiago de Compostela, Spain aut Vieira-Lanero Rufino Estación de Hidrobiología "Encoro do Con”, Castroagudín s/n, 36617, Vilagarcía de Arousa, Pontevedra, Spain aut Servia María Departamento de Biología Animal, Biología Vegetal y Ecología, Facultad de Ciencias, Universidad de A Coruña, Campus da Zapateira s/n, 15008, A Coruña, Spain aut Cobo Fernando Departamento de Zoología y Antropología Física, Universidad de Santiago de Compostela, Campus Sur s/n, 15782, Santiago de Compostela, Spain aut Hydrobiologia Springer Netherlands 663/1(2011-03-01), 109-119 0018-8158 663:1<109 2011 663 10750 https://doi.org/10.1007/s10750-010-0582-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-010-0582-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sánchez-Hernández Javier Departamento de Zoología y Antropología Física, Universidad de Santiago de Compostela, Campus Sur s/n, 15782, Santiago de Compostela, Spain aut NATIONALLICENCE 700 1- Vieira-Lanero Rufino Estación de Hidrobiología "Encoro do Con”, Castroagudín s/n, 36617, Vilagarcía de Arousa, Pontevedra, Spain aut NATIONALLICENCE 700 1- Servia María Departamento de Biología Animal, Biología Vegetal y Ecología, Facultad de Ciencias, Universidad de A Coruña, Campus da Zapateira s/n, 15008, A Coruña, Spain aut NATIONALLICENCE 700 1- Cobo Fernando Departamento de Zoología y Antropología Física, Universidad de Santiago de Compostela, Campus Sur s/n, 15782, Santiago de Compostela, Spain aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 663/1(2011-03-01), 109-119 0018-8158 663:1<109 2011 663 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer