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Startle durations reveal visual assessment abilities during contests between convict cichlids
Gareth Arnott1, Robert W Elwood
1School of Biological Sciences, Queen's University Belfast, 97 Lisburn Road, Belfast, County Antrim, UK. garnott01@qub.ac.uk
Behavioural Processes
|May 12, 2010
Summary
Animal contest research suggests that individuals may use self-assessment or opponent-only assessment strategies, rather than mutual assessment. Fight motivation data in convict cichlids revealed insights into these animal behavior models.
Area of Science:
- Ethology
- Animal Behavior
- Behavioral Ecology
Background:
- Mutual assessment, where contestants gauge opponents' resource holding potential (RHP), is a common model for animal contests.
- This model has been challenged, with self-assessment (relying on own state) proposed as an alternative.
- Understanding assessment strategies is crucial for explaining contest outcomes and evolutionary dynamics.
Purpose of the Study:
- To differentiate between mutual assessment, self-assessment, and opponent-only assessment models in animal contests.
- To investigate the role of visual information in opponent assessment during aggressive encounters.
- To measure fight motivation as an indicator of assessment strategy.
Main Methods:
- Utilized male convict cichlids (Amatitlania nigrofasciata) in size-mismatched aggressive pairs.
- Introduced a novel stimulus to elicit a startle response and measure fight resumption time as a proxy for fight motivation.
- Analyzed startle duration in relation to own size and opponent's size to infer assessment strategies.
Main Results:
- Data supported both self-assessment and opponent-only assessment strategies.
- Startle duration was negatively related to the contestant's own size, supporting self-assessment.
- Startle duration was positively related to the opponent's size in later trials, supporting opponent-only assessment.
Conclusions:
- Convict cichlids appear to utilize both self-assessment and opponent-only assessment strategies.
- Individuals may learn to use visual cues about opponents when other sensory information is limited.
- Evidence for mutual visual assessment was not found in this study, suggesting alternative mechanisms may be at play.
