Males are quicker to adjust aggression towards heterospecific intruders in a cichlid fish

Topi Lehtonen, Bob Wong

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)

Abstract

To manage the costs of aggression, territory holders confronted by intruders commonly adjust their aggression according to the perceived level of threat. Yet, we currently know surprisingly little about heterospecific interactions or sex differences with regard to adjustment of aggression, particularly in the context of the ‘dear enemy’ phenomenon, in which familiar individuals are treated less aggressively than unfamiliar ones. To address these knowledge gaps, we experimentally manipulated territorial intrusions in a biparental cichlid fish, the moga, Hypsophrys nicaraguensis, in their natural habitat. We found that aggression by both females and males decreased quicker when the focal fish was sequentially presented with the same heterospecific intruder stimulus than when it was presented on each round with a different stimulus. We also found a significant sex difference: the decrease in aggression over subsequent encounters was quicker in males. Such patterns of adjustment in aggression can have important ecological implications by affecting the territory-holding success of the interacting individuals, and, in the case of heterospecific interactions, patterns of species coexistence at the community level.

Original languageEnglish
Pages (from-to)145-151
Number of pages7
JournalAnimal Behaviour
Volume124
DOIs
Publication statusPublished - 1 Feb 2017

Keywords

  • aggression
  • dear enemy
  • habituation
  • heterospecific
  • Hypsophrys nicaraguensis
  • parental care
  • sex role
  • territory
  • visual signal

Cite this

@article{a13a1955e6884a14b3133113aeb9641a,
title = "Males are quicker to adjust aggression towards heterospecific intruders in a cichlid fish",
abstract = "To manage the costs of aggression, territory holders confronted by intruders commonly adjust their aggression according to the perceived level of threat. Yet, we currently know surprisingly little about heterospecific interactions or sex differences with regard to adjustment of aggression, particularly in the context of the ‘dear enemy’ phenomenon, in which familiar individuals are treated less aggressively than unfamiliar ones. To address these knowledge gaps, we experimentally manipulated territorial intrusions in a biparental cichlid fish, the moga, Hypsophrys nicaraguensis, in their natural habitat. We found that aggression by both females and males decreased quicker when the focal fish was sequentially presented with the same heterospecific intruder stimulus than when it was presented on each round with a different stimulus. We also found a significant sex difference: the decrease in aggression over subsequent encounters was quicker in males. Such patterns of adjustment in aggression can have important ecological implications by affecting the territory-holding success of the interacting individuals, and, in the case of heterospecific interactions, patterns of species coexistence at the community level.",
keywords = "aggression, dear enemy, habituation, heterospecific, Hypsophrys nicaraguensis, parental care, sex role, territory, visual signal",
author = "Topi Lehtonen and Bob Wong",
year = "2017",
month = "2",
day = "1",
doi = "10.1016/j.anbehav.2016.12.013",
language = "English",
volume = "124",
pages = "145--151",
journal = "Animal Behaviour",
issn = "0003-3472",
publisher = "Elsevier",

}

Males are quicker to adjust aggression towards heterospecific intruders in a cichlid fish. / Lehtonen, Topi; Wong, Bob.

In: Animal Behaviour, Vol. 124, 01.02.2017, p. 145-151.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Males are quicker to adjust aggression towards heterospecific intruders in a cichlid fish

AU - Lehtonen, Topi

AU - Wong, Bob

PY - 2017/2/1

Y1 - 2017/2/1

N2 - To manage the costs of aggression, territory holders confronted by intruders commonly adjust their aggression according to the perceived level of threat. Yet, we currently know surprisingly little about heterospecific interactions or sex differences with regard to adjustment of aggression, particularly in the context of the ‘dear enemy’ phenomenon, in which familiar individuals are treated less aggressively than unfamiliar ones. To address these knowledge gaps, we experimentally manipulated territorial intrusions in a biparental cichlid fish, the moga, Hypsophrys nicaraguensis, in their natural habitat. We found that aggression by both females and males decreased quicker when the focal fish was sequentially presented with the same heterospecific intruder stimulus than when it was presented on each round with a different stimulus. We also found a significant sex difference: the decrease in aggression over subsequent encounters was quicker in males. Such patterns of adjustment in aggression can have important ecological implications by affecting the territory-holding success of the interacting individuals, and, in the case of heterospecific interactions, patterns of species coexistence at the community level.

AB - To manage the costs of aggression, territory holders confronted by intruders commonly adjust their aggression according to the perceived level of threat. Yet, we currently know surprisingly little about heterospecific interactions or sex differences with regard to adjustment of aggression, particularly in the context of the ‘dear enemy’ phenomenon, in which familiar individuals are treated less aggressively than unfamiliar ones. To address these knowledge gaps, we experimentally manipulated territorial intrusions in a biparental cichlid fish, the moga, Hypsophrys nicaraguensis, in their natural habitat. We found that aggression by both females and males decreased quicker when the focal fish was sequentially presented with the same heterospecific intruder stimulus than when it was presented on each round with a different stimulus. We also found a significant sex difference: the decrease in aggression over subsequent encounters was quicker in males. Such patterns of adjustment in aggression can have important ecological implications by affecting the territory-holding success of the interacting individuals, and, in the case of heterospecific interactions, patterns of species coexistence at the community level.

KW - aggression

KW - dear enemy

KW - habituation

KW - heterospecific

KW - Hypsophrys nicaraguensis

KW - parental care

KW - sex role

KW - territory

KW - visual signal

UR - http://www.scopus.com/inward/record.url?scp=85009348197&partnerID=8YFLogxK

U2 - 10.1016/j.anbehav.2016.12.013

DO - 10.1016/j.anbehav.2016.12.013

M3 - Article

VL - 124

SP - 145

EP - 151

JO - Animal Behaviour

JF - Animal Behaviour

SN - 0003-3472

ER -