Journal ArticleDOI
Seeing orange: breeding convict cichlids exhibit heightened aggression against more colorful intruders
TLDR
Evidence is provided that more colorful females, which likely pose a threat to pair bond stability and nest maintenance, incite more aggression from breeding pairs than drab females, and adds to a growing body of research that seeks to understand the varied roles that colorful ornaments play in animal communication.Abstract:
Female convict cichlids (Amatitlania siquia) exhibit bright orange ventral coloration that males lack. The behavioral implications of this color are poorly understood, particularly in naturally occurring populations where female coloration could play a role in the expression of territorial nest-guarding behaviors. In this field experiment, monogamous breeding pairs of convict cichlids were presented with 3D printed model conspecific intruders of three body sizes (small, medium, and large) exhibiting three orange patch sizes (large, small, or none) to observe how territorial aggression varied as a function of intruder size and female coloration. Individuals occupying breeding pairs that were defending hatched offspring were significantly more aggressive toward intruders with small and large amounts of orange than toward models lacking orange, indicating that color is an important context-dependent elicitor of aggression in this species. Males were significantly more aggressive toward the intruder than females, and male aggression was strongly influenced by their size relative to the intruder. When males were smaller than the intruder, they performed significantly more aggressive acts than when they were the same size or larger than the intruder; this trend persisted across three putative populations in Lake Xiloa, Nicaragua. A potential explanation for these findings is that the orange color functions as a signal of individual quality or breeding readiness and that breeding pairs increase aggression to repel intruders that pose the greatest threat to pair bond and nest maintenance. One or both sexes of many animal species possess brightly colored features that might communicate information about overall heath or reproductive status. In convict cichlid fish, males and females establish pair bonds and jointly defend their nest and offspring. Single females exhibit striking orange coloration that males and breeding females lack. Our field-based experiment provided evidence that more colorful females, which likely pose a threat to pair bond stability and nest maintenance, incite more aggression from breeding pairs than drab females. Our study suggests that color provides salient information about, perhaps, female quality or readiness to breed in natural populations, and adds to a growing body of research that seeks to understand the varied roles that colorful ornaments play in animal communication.read more
Citations
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Journal ArticleDOI
Dark eyes in female sand gobies indicate readiness to spawn.
Karin H. Olsson,Sandra Johansson,Eva-Lotta Blom,Kai Lindström,Ola Svensson,Helen Nilsson Sköld,Charlotta Kvarnemo +6 more
TL;DR: It is suggested that dark eyes are not a signal per se but may be an aspect of female mate choice, possibly related to vision, and that males did not respond behaviorally to dark eyes or prefer dark-eyed females.
Journal ArticleDOI
Males are quicker to adjust aggression towards heterospecific intruders in a cichlid fish
TL;DR: In this paper, the authors experimentally manipulated territorial intrusions in a biparental cichlid fish, the moga, Hypsophrys nicaraguensis, in their natural habitat and 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.
Dissertation
Emotions et personnalité : au cœur des décisions chez un poisson monogame
TL;DR: In this article, the role of deux sources of variabilite dans the prise de decision, i.e., the personnalite and l'etat emotionnel, in a poisson monogame, is investigated.
Journal ArticleDOI
Dual function and associated costs of a highly exaggerated trait in a cichlid fish
Journal ArticleDOI
Aggression towards shared enemies by heterospecific and conspecific cichlid fish neighbours
TL;DR: The results suggest that previously demonstrated higher survival of convict cichlid broods in close proximity of mogas may be driven by aggression towards shared enemies, and heterospecific neighbours may provide protective benefits in a wider range of ecological settings than commonly considered.
References
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Journal ArticleDOI
Pseudoreplication in playback experiments, revisited a decade later
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Journal ArticleDOI
Carotenoid-based signals in behavioural ecology : a review
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TL;DR: Carotenoids are among the most prevalent pigments used in animal signals and are also important for a range of physiological functions and these concomitant roles have made carotenoidbased signals a po…