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Animal evolution at the ocean's water-air interface.

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Floating ocean animals evolved from attached ancestors, not just the seafloor. These species adapted by attaching to other organisms or debris, demonstrating evolutionary pathways to the ocean

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Area of Science:

  • Evolutionary biology
  • Marine biology
  • Ecology

Background:

  • Obligate neuston are specialized surface-dwelling species with unique floating adaptations.
  • A.I. Savilov hypothesized that floating species originated from benthic ancestors and their floating structures are homologous to attachment structures.

Purpose of the Study:

  • To test Savilov's hypothesis on the evolutionary origins of marine neuston.
  • To investigate the ancestral states and evolutionary pathways of major floating animal groups.

Main Methods:

  • Construction of molecular phylogenies for major floating taxa.
  • Ancestral state reconstruction using available molecular data.
  • Analysis of trophic habits in floating mollusks and their sister species.

Main Results:

  • Four out of five examined clades originated from substrate-attached ancestors.
  • Ancestors included epibiotic and rafting species, not exclusively benthic.
  • Gas-trapping structures in neuston are often homologous to ancestral attachment structures.
  • Trophic preferences are conserved when species colonize the ocean surface.

Conclusions:

  • Colonization of the ocean surface likely occurred through stepwise transitions from the seafloor, involving epibiotic or rafting stages.
  • The water-air interface can be viewed as a substrate, facilitating evolutionary transitions.
  • Floating morphologies often evolved from structures used for substrate attachment.