Personality-dependent inter- and intraspecific foraging competition in the invasive round goby, Neogobius melanostomus

Philip Ericsson*, Anders Persson, Jane W. Behrens, Tomas Brodin, Philipp Emanuel Hirsch, Anna Sundelin, Mikael van Deurs, Lisa von Friesen, Anders P. Nilsson

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This study examines the impact of boldness on foraging competition of the highly invasive round goby Neogobius melanostomus Pallas 1815. Individual risk tolerance, or boldness, was measured as the time to resume movement after a simulated predation strike. Fish that resumed movement faster were categorized as “bold”, fish that took more time to resume movement were categorized as “shy”, and those who fell in between these two categories were determined to have “intermediate” boldness. Competitive impacts of boldness in N. melanostomus were determined in a laboratory foraging experiment in which interspecific (juvenile Atlantic cod Gadus morhua Linnaeus 1758) and intraspecific (intermediate N. melanostomus) individuals were exposed to either bold or shy N. melanostomus competitors. G. morhua consumed fewer prey when competing with bold N. melanostomus than when competing with shy N. melanostomus, whereas intermediately bold N. melanostomus foraging was not affected by competitor boldness. Bold and shy N. melanostomus consumed similar amounts of prey, and the number of interactions between paired fish did not vary depending on the personality of N. melanostomus individuals. Hence, intraspecific foraging competition was not found to be personality dependent. This study provides evidence that individual differences in boldness can mediate competitive interactions in N. melanostomus, however results also show that competition is also governed by other mechanisms which require further study.
Original languageEnglish
JournalJournal of Fish Biology
Volume98
Issue number5
Pages (from-to)1234-1241
Number of pages8
ISSN0022-1112
DOIs
Publication statusPublished - 2021

Keywords

  • Personality
  • Boldness
  • Behavioural syndrome
  • Competition
  • Neogobius melanostomus

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