Related Experiment Video
Updated: Jan 5, 2026
09:03
Manipulation of Color Patterns in Jumping Spiders for Use in Behavioral Experiments
Published on: May 21, 2019
10.0K
Darker ants dominate the canopy: Testing macroecological hypotheses for patterns in colour along a microclimatic
Stephanie J Law1, Tom R Bishop1,2, Paul Eggleton3
1Department of Earth, Ocean and Ecological Sciences, School of Environmental Sciences, University of Liverpool, Liverpool, UK.
The Journal of Animal Ecology
|October 23, 2019
Summary
Ants in tropical rainforests show darker coloration in the canopy and understory compared to the ground and subterranean levels. This pattern is linked to microclimatic factors like humidity and UV radiation, influencing ant survival and ecosystem function.
Area of Science:
- Ecology
- Evolutionary Biology
- Zoology
- Ant Ecology
- Cuticular Pigmentation
Background:
- Macroecological patterns of ectotherm cuticle lightness are often explained by hypotheses like thermal melanism, melanism-desiccation, and photo-protection.
- Broad abiotic measures may not accurately reflect the microclimates experienced by small, cursorial ectotherms such as ants.
- Understanding trait variation at smaller spatial scales is crucial for predicting responses to environmental change.
Purpose of the Study:
- To test macroecological hypotheses of cuticle lightness at the habitat and microclimatic level in a tropical rainforest ant assemblage.
- To investigate the influence of vertical microclimatic gradients on ant cuticle lightness and assemblage structure.
- To determine the relative importance of temperature, humidity, and UV-B radiation in shaping ant coloration.
Main Methods:
- Sampled 222 ant species across four vertical strata (subterranean, ground, understory, canopy) in a lowland tropical rainforest.
- Recorded cuticle lightness, abundance, and estimated body size for each species.
- Measured microclimatic variables (air temperature, vapor pressure deficit, UV-B radiation) for each vertical stratum.
Main Results:
- Ant assemblages exhibited vertical stratification in cuticle lightness, with canopy and understory ants being significantly darker than ground and subterranean ants.
- Cuticle lightness was not correlated with body size, and the thermal melanism hypothesis was not supported.
- The observed cline in cuticle lightness was attributed to a combination of the melanism-desiccation and photo-protection hypotheses.
Conclusions:
- Macroecological patterns of trait variation can be observed at smaller spatial scales, driven by microclimatic gradients.
- Microclimatic factors, rather than broad temperature patterns, are key drivers of cuticle lightness variation in ants.
- Changes in microclimate due to land-use change or climate warming could alter ant assemblage structure and ecosystem functioning through selection on cuticle color.
Related Concept Videos
01:07Speciation Rates
22.5K
Overview
22.5K
00:53Migration
8.7K
Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
8.7K
01:21Testing a Claim about Mean: Unknown Population SD
5.4K
A complete procedure of testing a hypothesis about a population mean when the population standard deviation is unknown is explained here.
Estimating a population mean requires the samples to be approximately normally distributed. The data should be collected from the randomly selected samples having no sampling bias. There is no specific requirement for sample size. But if the sample size is less than 30, and we don't know the population standard deviation, a different approach is used;...
Estimating a population mean requires the samples to be approximately normally distributed. The data should be collected from the randomly selected samples having no sampling bias. There is no specific requirement for sample size. But if the sample size is less than 30, and we don't know the population standard deviation, a different approach is used;...
5.4K
02:27Background and Environment Affect Phenotype
7.3K
Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
7.3K
02:02Ecological Niches
25.9K
All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.
25.9K
01:32What is Natural Selection?
125.4K
Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
125.4K