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Sexual segregation in European cyprinids: consequence of response to predation risk influenced by sexual size dimorphism
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SYSNO ASEP 0538493 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Sexual segregation in European cyprinids: consequence of response to predation risk influenced by sexual size dimorphism Author(s) Žák, Jakub (BC-A) RID, ORCID
Prchalová, Marie (BC-A) RID, ORCID
Šmejkal, Marek (BC-A) RID, ORCID
Blabolil, Petr (BC-A) RID, ORCID
Vašek, Mojmír (BC-A) RID, ORCID
Matěna, Josef (BC-A) RID
Říha, Milan (BC-A) RID, ORCID
Peterka, Jiří (BC-A) RID, ORCID
Seďa, Jaromír (BC-A) RID
Kubečka, Jan (BC-A) RID, ORCIDNumber of authors 10 Source Title Hydrobiologia. - : Springer - ISSN 0018-8158
Roč. 847, č. 6 (2020), s. 1439-1451Number of pages 13 s. Language eng - English Country NL - Netherlands Keywords Antipredator response ; Forage selection hypothesis ; Sex-specific behaviour ; Habitat segregation ; Rutilus rutilus Subject RIV DA - Hydrology ; Limnology OECD category Marine biology, freshwater biology, limnology R&D Projects EF16_025/0007417 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GPP505/12/P647 GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support BC-A - RVO:60077344 UT WOS 000513034800001 EID SCOPUS 85079501515 DOI 10.1007/s10750-020-04198-x Annotation Fish respond to predation threat by size/cohort-dependent presence in particular habitats and this may contribute to sexual segregation between habitats in species with sexual size dimorphism (SSD). The present study examines the validity of the 'predation risk hypothesis' and importance of SSD on habitat (pelagic/inshore) segregation and dietary differences between sexes in three cyprinids with various magnitudes of SSD-roach (Rutilus rutilus), freshwater bream (Abramis brama) and bleak (Alburnus alburnus). Fish were sampled using gillnets over five consecutive years in the imov Reservoir. Habitat segregation with female overrepresentation in the pelagic habitat was found in the most sexually dimorphic species with 26% bigger females-the roach. When analysis of habitat segregation was size-controlled, this segregation ceased to confirm the importance of SSD. Freshwater bream sexes (2% SSD) differed in diet but did not differ in habitat occupation. Bleak sexes were not segregated. Larger roach individuals (predominantly females) are less threatened by gape-limited predators and consequently they can occupy the risky but optimal (for zooplankton acquisition) pelagic habitat. Our results demonstrate that habitat segregation is present in the species with the most pronounced SSD. Workplace Biology Centre (since 2006) Contact Dana Hypšová, eje@eje.cz, Tel.: 387 775 214 Year of Publishing 2021 Electronic address https://doi.org/10.1007/s10750-020-04198-x
Number of the records: 1