Predator-prey interactions in aquatic food webs depend on the sizes of both predator and prey. In the present study, size-dependent interactions between >70 mm total length pikeperch Sander lucioperca (L.) and four different prey species in the biomanipulated Bautzen Reservoir were investigated. Gape widths of 597 pikeperch were measured, and the stomach contents of 806 specimens were analysed. Additionally, total lengths (TL) and body depths of 1448 prey fish were determined. The highest prey length to predator length ratio (PPR) was 0.63. Total lengths of piscivorous pikeperch and total lengths of prey fish [pikeperch, ruffe Gymnocephalus cernuus (L.) and roach Rutilus rutilus (L.)] were positively and linearly related. This was not the case for prey perch (Perca fluviatilis L.) as all size groups of pikeperch fed strongly on age-0 perch. This study coupled with results of previous studies suggests that predation by pikeperch can have a major impact on the population dynamics of especially perch.
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Ecology of freshwater fish
卷
16
期
3
页码
307
- 314
ISSN
0906-6691
出版者
Basel : SP Birkhäuser Verlag Basel
其它主题
Gymnocephalus cernua; Predator-prey relationships; Predator to prey ratio; Predator-prey interactions; Aquatic food webs
语言
英语
类型
Text; Journal Article
2024-02-28
MODS