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Dynamics of among-individual behavioral variation over adult lifespan in a wild insect.

Fisher DN, David M, Tregenza T, Rodríguez-Muñoz R - Behav. Ecol. (2015)

Bottom Line: All 4 traits showed among-individual variance in mean levels of expression across the adult lifespan, but no significant differences in how rapidly expression changed with age.Our findings reveal seldom examined changes in variance components over the adult lifetime of wild individuals.Such changes will have important implications for the relationship between behavioral traits, life-histories, and fitness and the consequences of selection on wild individuals.

View Article: PubMed Central - PubMed

Affiliation: Centre for Ecology and Conservation, University of Exeter , Treliever Road, Penryn TR109FE , UK and.

ABSTRACT

Investigating patterns of among and within-individual trait variation in populations is essential to understanding how selection shapes phenotypes. Behavior is often the most flexible aspect of the phenotype, and to understand how it is affected by selection, we need to examine how consistent individuals are. However, it is not well understood whether among-individual differences tend to remain consistent over lifetimes, or whether the behavior of individuals relative to one another varies over time. We examined the dynamics of 4 behavioral traits (tendency to leave a refuge, shyness, activity, and exploration) in a wild population of field crickets (Gryllus campestris). We tagged individuals and then temporarily removed them from their natural environment and tested them under laboratory conditions. All 4 traits showed among-individual variance in mean levels of expression across the adult lifespan, but no significant differences in how rapidly expression changed with age. For all traits, among-individual variance increased as individuals got older. Our findings reveal seldom examined changes in variance components over the adult lifetime of wild individuals. Such changes will have important implications for the relationship between behavioral traits, life-histories, and fitness and the consequences of selection on wild individuals.

No MeSH data available.


Related in: MedlinePlus

Plots of the among-individual change with age. (a) Tendency to leave the tube, (b) shyness, (c) activity, (d) exploration. Values calculated from the results of the RRs following code provided by (Brommer 2013b).
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Figure 4: Plots of the among-individual change with age. (a) Tendency to leave the tube, (b) shyness, (c) activity, (d) exploration. Values calculated from the results of the RRs following code provided by (Brommer 2013b).

Mentions: All traits showed a similar pattern in the change of the among-individual variance with age. There was a small decrease in among-individual variance from the youngest to the mean age, then a large increase through to old age. This appears to be a mixture of a steady increase and a U-shaped curve (Figure 4a–d).


Dynamics of among-individual behavioral variation over adult lifespan in a wild insect.

Fisher DN, David M, Tregenza T, Rodríguez-Muñoz R - Behav. Ecol. (2015)

Plots of the among-individual change with age. (a) Tendency to leave the tube, (b) shyness, (c) activity, (d) exploration. Values calculated from the results of the RRs following code provided by (Brommer 2013b).
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4495759&req=5

Figure 4: Plots of the among-individual change with age. (a) Tendency to leave the tube, (b) shyness, (c) activity, (d) exploration. Values calculated from the results of the RRs following code provided by (Brommer 2013b).
Mentions: All traits showed a similar pattern in the change of the among-individual variance with age. There was a small decrease in among-individual variance from the youngest to the mean age, then a large increase through to old age. This appears to be a mixture of a steady increase and a U-shaped curve (Figure 4a–d).

Bottom Line: All 4 traits showed among-individual variance in mean levels of expression across the adult lifespan, but no significant differences in how rapidly expression changed with age.Our findings reveal seldom examined changes in variance components over the adult lifetime of wild individuals.Such changes will have important implications for the relationship between behavioral traits, life-histories, and fitness and the consequences of selection on wild individuals.

View Article: PubMed Central - PubMed

Affiliation: Centre for Ecology and Conservation, University of Exeter , Treliever Road, Penryn TR109FE , UK and.

ABSTRACT

Investigating patterns of among and within-individual trait variation in populations is essential to understanding how selection shapes phenotypes. Behavior is often the most flexible aspect of the phenotype, and to understand how it is affected by selection, we need to examine how consistent individuals are. However, it is not well understood whether among-individual differences tend to remain consistent over lifetimes, or whether the behavior of individuals relative to one another varies over time. We examined the dynamics of 4 behavioral traits (tendency to leave a refuge, shyness, activity, and exploration) in a wild population of field crickets (Gryllus campestris). We tagged individuals and then temporarily removed them from their natural environment and tested them under laboratory conditions. All 4 traits showed among-individual variance in mean levels of expression across the adult lifespan, but no significant differences in how rapidly expression changed with age. For all traits, among-individual variance increased as individuals got older. Our findings reveal seldom examined changes in variance components over the adult lifetime of wild individuals. Such changes will have important implications for the relationship between behavioral traits, life-histories, and fitness and the consequences of selection on wild individuals.

No MeSH data available.


Related in: MedlinePlus