Size-dependent prey selection in piscivorous pikeperch Sander lucioperca and Volga pikeperch Sander volgensis shaped by bimodal prey size distribution

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13 Citations (Scopus)

Abstract

Prey size and species selection of pikeperch Sander lucioperca and Volga pikeperch Sander volgensis were investigated in relation to predator size in the shallow Lake Balaton, Hungary. Although their gape sizes were similar, S. lucioperca shifted to piscivory earlier and consumed fewer, but larger, prey than S. volgensis. Prey species preference of the two piscivores also differed. A bimodal prey size distribution resulted in a reclining sigmoid curve for the life span predator size to prey size relationship with inflexion points between 266 and 284 mm predator standard length (L S) in S. lucioperca. In S. volgensis, as well as in S. lucioperca L S≤ 350 mm, prey size increased monotonically with predator L S, following a power trend for all prey size variables. Prey depth to predator L S relationship varied significantly with prey species and prey number in both piscivores, and prey depth tended to be smaller in predators consuming more than one prey. Both predator species characteristically selected less active, benthic prey fishes in spite of their spiny fin rays, and small- and mid-sized predators selected for small prey. Relatively large prey were also eaten, however, especially by the smallest and largest S. lucioperca.

Original languageEnglish
Pages (from-to)1895-1917
Number of pages23
JournalJournal of Fish Biology
Volume79
Issue number7
DOIs
Publication statusPublished - Dec 2011

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prey selection
Sander lucioperca
prey size
predator
predators
piscivore
piscivory
Sander volgensis
Hungary
fins
lakes
lake
fish

Keywords

  • Diet ontogeny
  • Diet shift
  • Gape-limited predator
  • Lake Balaton
  • Prey to predator size ratio

ASJC Scopus subject areas

  • Aquatic Science
  • Ecology, Evolution, Behavior and Systematics

Cite this

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title = "Size-dependent prey selection in piscivorous pikeperch Sander lucioperca and Volga pikeperch Sander volgensis shaped by bimodal prey size distribution",
abstract = "Prey size and species selection of pikeperch Sander lucioperca and Volga pikeperch Sander volgensis were investigated in relation to predator size in the shallow Lake Balaton, Hungary. Although their gape sizes were similar, S. lucioperca shifted to piscivory earlier and consumed fewer, but larger, prey than S. volgensis. Prey species preference of the two piscivores also differed. A bimodal prey size distribution resulted in a reclining sigmoid curve for the life span predator size to prey size relationship with inflexion points between 266 and 284 mm predator standard length (L S) in S. lucioperca. In S. volgensis, as well as in S. lucioperca L S≤ 350 mm, prey size increased monotonically with predator L S, following a power trend for all prey size variables. Prey depth to predator L S relationship varied significantly with prey species and prey number in both piscivores, and prey depth tended to be smaller in predators consuming more than one prey. Both predator species characteristically selected less active, benthic prey fishes in spite of their spiny fin rays, and small- and mid-sized predators selected for small prey. Relatively large prey were also eaten, however, especially by the smallest and largest S. lucioperca.",
keywords = "Diet ontogeny, Diet shift, Gape-limited predator, Lake Balaton, Prey to predator size ratio",
author = "A. Speczi{\'a}r",
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AB - Prey size and species selection of pikeperch Sander lucioperca and Volga pikeperch Sander volgensis were investigated in relation to predator size in the shallow Lake Balaton, Hungary. Although their gape sizes were similar, S. lucioperca shifted to piscivory earlier and consumed fewer, but larger, prey than S. volgensis. Prey species preference of the two piscivores also differed. A bimodal prey size distribution resulted in a reclining sigmoid curve for the life span predator size to prey size relationship with inflexion points between 266 and 284 mm predator standard length (L S) in S. lucioperca. In S. volgensis, as well as in S. lucioperca L S≤ 350 mm, prey size increased monotonically with predator L S, following a power trend for all prey size variables. Prey depth to predator L S relationship varied significantly with prey species and prey number in both piscivores, and prey depth tended to be smaller in predators consuming more than one prey. Both predator species characteristically selected less active, benthic prey fishes in spite of their spiny fin rays, and small- and mid-sized predators selected for small prey. Relatively large prey were also eaten, however, especially by the smallest and largest S. lucioperca.

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KW - Prey to predator size ratio

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