Response of the residential piscivorous fish community to introduction of a new predator type in a mesotrophic lake

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2006
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Schulze, Torsten
Baade, Ulrich
Dörner, Hendrik
Haertel-Borer, Susanne
Hölker, Franz
Mehner, Thomas
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Canadian journal of fisheries and aquatic sciences. 2006, 63(10), pp. 2202-2212. ISSN 0706-652X. eISSN 1205-7533. Available under: doi: 10.1139/f06-099
Zusammenfassung

Although the effects of introduced predators on prey populations in aquatic ecosystems have been studied frequently, less is known about the interactions between predators. We performed a whole-lake experiment by stocking a non-native top predator (pikeperch (Sander lucioperca)) to two residential piscivores (Eurasian perch) (Perca fluviatilis) and northern pike (Esox lucius)). By analyzing spatial distribution, diet composition, growth, and consumption rates of the piscivores before and after pikeperch introduction, we tested how both density-dependent and trait-mediated responses affected interactions between the three predators. Total piscivore biomass increased 1.5 times and annual consump- tion by the piscivores increased 1.7 times after stocking, attributable to the stocked pikeperch and increased northern pike abundances. Abundance, distri- bution, and consumption data indicated that northern pike was hardly affected by pikeperch stocking and even increased its biomass, whereas piscivorous perch shifted its habitat use towards the littoral lake areas in response to competition with pikeperch. Furthermore, all piscivores increasingly fed on small perch. The forced habitat shift of piscivorous perch in combination with increased predation on small perch led to a decreased abundance of large perch, attributable to the compensatory effects of intraguild predation and canni- balism.

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Fachgebiet (DDC)
570 Biowissenschaften, Biologie
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predator type, mesotrophic, piscivores, piscivorous
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ISO 690SCHULZE, Torsten, Ulrich BAADE, Hendrik DÖRNER, Reiner ECKMANN, Susanne HAERTEL-BORER, Franz HÖLKER, Thomas MEHNER, 2006. Response of the residential piscivorous fish community to introduction of a new predator type in a mesotrophic lake. In: Canadian journal of fisheries and aquatic sciences. 2006, 63(10), pp. 2202-2212. ISSN 0706-652X. eISSN 1205-7533. Available under: doi: 10.1139/f06-099
BibTex
@article{Schulze2006Respo-8029,
  year={2006},
  doi={10.1139/f06-099},
  title={Response of the residential piscivorous fish community to introduction of a new predator type in a mesotrophic lake},
  number={10},
  volume={63},
  issn={0706-652X},
  journal={Canadian journal of fisheries and aquatic sciences},
  pages={2202--2212},
  author={Schulze, Torsten and Baade, Ulrich and Dörner, Hendrik and Eckmann, Reiner and Haertel-Borer, Susanne and Hölker, Franz and Mehner, Thomas}
}
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