Related Experiment Video
Updated: Jun 9, 2026
14:34
How to Create and Use Binocular Rivalry
Published on: November 10, 2010
Short-term dominance: stability and consequences for subsequent growth.
1Department of Biological and Environmental Sciences, P. O. Box 65, FIN-00014 University of Helsinki, Finland. katriina.tiira@helsinki.fi
Journal of Fish Biology
|August 26, 2010
Summary
Social status impacts fish growth, with lower-ranking brown trout (Salmo trutta) growing less. Dominance hierarchies proved stable over time, indicating short-term trials accurately reflect social status in fish populations.
Area of Science:
- Animal Behavior
- Aquatic Ecology
- Fish Biology
Background:
- Social hierarchies are common in animal populations.
- Understanding dominance in fish is crucial for population dynamics.
- Brown trout (Salmo trutta) exhibit complex social behaviors.
Purpose of the Study:
- To determine the effect of social status on brown trout growth.
- To assess the stability of dominance hierarchies in brown trout.
- To validate short-term dominance trials for predicting long-term social status.
Main Methods:
- Dominance status was assessed in small groups of brown trout.
- Fish growth was monitored after initial dominance trials.
- A second set of dominance trials was conducted seven months later.
Main Results:
- Lower-ranking fish exhibited significantly reduced growth compared to higher-ranking individuals.
- Dominance hierarchies remained relatively stable between trials.
- Subordinate fish consistently maintained their low social status.
Conclusions:
- Social status directly influences growth rates in brown trout.
- Short-term dominance assessments are reliable indicators of an individual's social standing.
- Stable hierarchies suggest predictable social dynamics within fish populations.
Related Concept Videos
01:08Timing and Consequences on Behavior
In operant conditioning, the timing of reinforcement is crucial. For animals like rats and cats, immediate reinforcement (within a few seconds) is much more effective than delayed reinforcement. For example, a food reward for a rat needs to follow within 30 seconds of pressing a bar to be effective.
Humans, however, can respond to delayed reinforcers. We often make decisions between immediate small rewards and delayed larger rewards. This ability to delay gratification is a significant factor...
Humans, however, can respond to delayed reinforcers. We often make decisions between immediate small rewards and delayed larger rewards. This ability to delay gratification is a significant factor...
01:24Growth versus Fixed Mindset
Carol Dweck introduced the term mindset to describe individuals' beliefs about their intellectual and personal capabilities. These beliefs significantly influence psychological processes such as motivation, goal-setting, and perseverance, ultimately shaping academic and life outcomes. Individuals generally possess one of two mindsets- a fixed or a growth mindset—each promoting different responses to success, failure, and challenge.Fixed vs. Growth MindsetA fixed mindset assumes that one's...
01:29Life Histories
Constrained by limited energy and resources, organisms must compromise between offspring quantity and parental investment. This trade-off is represented by two primary reproductive strategies; K-strategists produce few offspring but provide substantial parental support, whereas r-strategists produce much progeny that receives little care. These strategies are related to an organism’s survival likelihood across its lifespan, which is represented by a survivorship curve. Three general types of...
02:17Ecological Succession
Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
01:28Stability
The time response of a linear time-invariant (LTI) system can be divided into transient and steady-state responses. The transient response represents the system's initial reaction to a change in input and diminishes to zero over time. In contrast, the steady-state response is the behavior that persists after the transient effects have faded.
The stability of an LTI system is determined by the roots of its characteristic equation, known as poles. A system is stable if it produces a bounded...
The stability of an LTI system is determined by the roots of its characteristic equation, known as poles. A system is stable if it produces a bounded...
01:25Long-term Potentiation
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when presynaptic neurons...
Hebbian LTP
LTP can occur when presynaptic neurons...