Related Experiment Video
Updated: Jun 22, 2026
05:39
Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae
Published on: December 2, 2022
Speciation-rate dependence in species-area relationships.
Simone Pigolotti1, Massimo Cencini
1The Niels Bohr International Academy, The Niels Bohr Institut, Copenhagen, Denmark.
Journal of Theoretical Biology
|June 9, 2009
Summary
Species-area relationships (SAR) describe how species number increases with area. This study uses a voter model to show the species-area exponent depends on speciation rates and species lifespans.
Area of Science:
- Ecology
- Theoretical Ecology
- Mathematical Biology
Background:
- Species-area relationships (SAR) are fundamental ecological laws.
- SAR curves often follow a power-law: S ∝ A^z, where z is the species-area exponent.
- The variation in z across ecosystems is not fully understood.
Purpose of the Study:
- To investigate the multitype voter model for reproducing empirical species-area relationships.
- To analyze the influence of speciation rate (nu) on the species-area exponent (z).
- To compare model outcomes with field data, considering speciation and species lifespans.
Main Methods:
- Extensive numerical simulations of the multitype voter model.
- Simulation of a broad range of dimensionless speciation rates (nu).
- Analysis of the relationship between the inverse species-area exponent and the logarithm of speciation rate and species lifespan.
Main Results:
- The multitype voter model reproduces SAR patterns observed in nature.
- The species-area exponent (z) is dependent on the dimensionless speciation rate (nu).
- A linear relationship exists between the inverse exponent and the logarithm of speciation rate and species lifespan.
Conclusions:
- The multitype voter model provides a framework for understanding SAR.
- The inverse species-area exponent linearly depends on the logarithm of speciation rate.
- While species lifespan correlates with the exponent, evolutionary constraints suggest additional factors influence SAR.
Related Concept Videos
01:07Speciation Rates
Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.
02:16Genetics of Speciation
Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...
01:31Formation of Species
Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.Allopatric SpeciationIn allopatric speciation, gene flow between two populations of the same species is prevented by a geographic barrier, like...
01:21Frequency-dependent Selection
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.Positive Frequency-Dependent SelectionIn positive...
02:29Hybrid Zones
Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.Gene flow and natural selection are evolutionary mechanisms that shape the outcome of a hybrid zone. Gene flow...
02:55The Evidence for Evolution
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.The collection of fossils within sedimentary rocks give a record of common ancestry and often depicts the history of evolution.