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Speciation Rates

Speciation Rates

Convergent Evolution

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.

Formation of Species

Formation 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.

Hybrid Zones

Hybrid 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.

Genetic Drift

Genetic Drift

Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.

Population Growth

Population Growth

Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.

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Resurrection of Dormant Daphnia magna: Protocol and Applications

Resurrection of Dormant Daphnia magna: Protocol and Applications

Published on: January 19, 2018

Adaptive radiation: convergence and non-equilibrium.

Rosemary G Gillespie¹

¹Division of Organisms and Environment, University of California, Berkeley, CA 94720-3114, USA. gillespie@berkeley.edu

Current Biology : CB

|January 26, 2013

Summary

This summary is machine-generated.

The adaptive radiation of cichlid fish in Lake Tanganyika shows significant morphological convergence. This suggests non-equilibrium dynamics are crucial for understanding their community assembly.

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Area of Science:

Evolutionary biology
Ecology
Ichthyology

Background:

Lake Tanganyika hosts a spectacular adaptive radiation of cichlid fish.
This radiation is characterized by extensive morphological convergence.
Ecologically similar species co-occur within this diverse community.

Purpose of the Study:

To reevaluate community assembly dynamics in light of cichlid adaptive radiation.
To investigate the role of non-equilibrium processes in shaping cichlid communities.

Main Methods:

Comparative analysis of cichlid morphology.
Ecological niche modeling.
Community structure analysis.

Main Results:

Observed significant morphological convergence among ecologically similar cichlid species.
Demonstrated co-occurrence patterns consistent with non-equilibrium assembly.
Identified key ecological factors driving diversification.

Conclusions:

Cichlid adaptive radiation in Lake Tanganyika provides a model for studying non-equilibrium community assembly.
Morphological convergence and species co-occurrence challenge traditional equilibrium-based ecological theories.
Further research into non-equilibrium dynamics is essential for understanding biodiversity patterns.