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Immigrant reproductive dysfunction facilitates ecological speciation.

Ola Svensson1,2,3, Johanna Gräns1, Malin C Celander1,2

  • 1Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Gothenburg, Sweden.

Evolution; International Journal of Organic Evolution
|August 10, 2017
PubMed
Summary
This summary is machine-generated.

Immigrants may struggle to reproduce in new environments, a phenomenon called immigrant reproductive dysfunction. This can impact species distribution and speciation by reducing gene flow.

Keywords:
Ecological speciationimmigrant inviabilityimmigrant reproductive dysfunctionlocal adaptationmultifarious selectiontransporter hypothesis

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Speciation Research

Background:

  • Species distributions are shaped by survival and reproduction in new environments.
  • Immigrant inviability is recognized, but immigrant reproductive success is less studied.
  • Reproduction is a sensitive life-history stage potentially impacted in non-native habitats.

Purpose of the Study:

  • To introduce and investigate "immigrant reproductive dysfunction" as a factor in reproductive isolation.
  • To explore the role of natural selection on immigrant reproduction.
  • To understand its implications for species distributions and speciation.

Main Methods:

  • Conducted experiments on the sand goby (Pomatoschistus minutus), an externally fertilizing fish.
  • Assessed adult growth and condition in non-native salinity.
  • Measured sperm motility and hatching success in immigrant versus resident males.

Main Results:

  • Adult sand gobies showed no significant changes in growth or condition in non-native salinity.
  • Immigrant males exhibited reduced sperm motility and hatching success compared to residents.
  • These findings suggest local adaptation or acclimation of reproductive traits.

Conclusions:

  • "Immigrant reproductive dysfunction" is a potential mechanism of reproductive isolation.
  • This dysfunction can reduce gene flow between populations.
  • It may be a significant factor in shaping species distributions and driving speciation.