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Lateral plate evolution in the threespine stickleback: getting nowhere fast.

M A Bell1

  • 1Department of Ecology and Evolution, State University of New York, Stony Brook 11794-5245, USA. mabell@life.bio.sunysb.edu

Genetica
|February 13, 2002
PubMed
Summary
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Threespine stickleback (Gasterosteus aculeatus) populations rapidly evolve new traits, but specialized freshwater populations frequently go extinct. This rapid evolution without sustained divergence impacts speciation studies.

Area of Science:

  • Evolutionary Biology
  • Ecology
  • Genetics

Background:

  • Gasterosteus aculeatus, or the threespine stickleback, is a widely distributed fish species with marine, anadromous, and freshwater forms.
  • Marine and anadromous populations show limited variation over millions of years, while freshwater isolates undergo rapid adaptive radiation.
  • Traits like lateral plates (LP) can evolve within decades in response to environmental changes, particularly predation.

Purpose of the Study:

  • To investigate the paradox of rapid trait evolution in threespine stickleback populations without sustained long-term divergence.
  • To understand the factors contributing to the extinction of highly divergent freshwater stickleback populations.
  • To explore the implications of rapid evolution and extinction for speciation research.

Main Methods:

Related Experiment Videos

  • Comparative analysis of marine, anadromous, and freshwater populations of Gasterosteus aculeatus.
  • Examination of trait evolution, specifically lateral plate development, in response to environmental pressures.
  • Assessment of population divergence and extinction rates in isolated freshwater habitats.

Main Results:

  • Freshwater stickleback populations exhibit rapid adaptive radiation and significant trait evolution, such as changes in lateral plates (LP).
  • Despite rapid evolution, highly divergent populations are prone to extinction due to specialization in ephemeral, isolated habitats.
  • Sustained evolutionary divergence into widespread species is rare, with biological species also facing extinction risks.

Conclusions:

  • The rapid evolution of threespine stickleback is counterbalanced by high extinction rates of specialized populations, limiting sustained divergence.
  • This dynamic has significant implications for understanding speciation rates and using post-glacial populations in comparative evolutionary studies.
  • The findings suggest that rapid evolution without speciation may be a common pattern in species complexes facing fluctuating environments.