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Related Experiment Video

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Raising the Mexican Tetra Astyanax mexicanus for Analysis of Post-larval Phenotypes and Whole-mount Immunohistochemistry
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How fish eggs are preadapted for the evolution of matrotrophy.

Keenan R Morrison1, Vyvian Ngo2, Richard A Cardullo2

  • 1Department of Biology, University of California, Riverside, CA 92507, USA keenanmorrison@gmail.com.

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Summary

Fish eggs can actively absorb nutrients, unlike reptile eggs. This difference in egg resource acquisition may explain why livebearing with maternal nourishment (matrotrophy) evolved more frequently in fish than in reptiles.

Keywords:
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Area of Science:

  • Evolutionary Biology
  • Reproductive Strategies
  • Comparative Physiology

Background:

  • Livebearing (viviparity) has evolved independently multiple times in teleost fishes and squamate reptiles.
  • Matrotrophy, a form of livebearing where the mother nourishes the embryo, is common in fish but rare in reptiles.
  • The discrepancy in matrotrophy evolution suggests underlying differences in reproductive physiology.

Purpose of the Study:

  • To investigate if differences in egg permeability to maternal resources explain the divergent evolution of matrotrophy between fish and reptiles.
  • To characterize the mechanisms of nutrient uptake in the eggs of Atherinomorpha fishes.

Main Methods:

  • Experiments using oviparous Atherinomorpha fish eggs to assess the uptake of small organic molecules.
  • Utilized radiolabeled amino acids to measure uptake rates and test for competitive inhibition.
  • Investigated the transport of larger microspheres at varying temperatures to infer the mechanism (pinocytosis) and its temperature dependence.

Main Results:

  • Atherinomorpha fish eggs actively transport small organic molecules against a concentration gradient.
  • Uptake is non-specific, indicated by similar transport rates for L-leucine and D-leucine.
  • Eggs transport larger particles via temperature-dependent pinocytosis, suggesting an active process.

Conclusions:

  • The ability of fish eggs to actively acquire maternal resources provides a physiological basis for the evolution of matrotrophy.
  • Amniote eggs, lacking direct access to maternal resources, face different evolutionary constraints on developing matrotrophy.
  • Egg permeability to maternal resources is a critical factor influencing the evolutionary trajectory of livebearing and matrotrophy.