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Behavioral Tracking and Neuromast Imaging of Mexican Cavefish
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Ecomorphological convergence of cave communities.

Peter Trontelj1, Andrej Blejec, Cene Fišer

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Cave crustaceans (Niphargus) show diverse morphologies driven by microhabitat partitioning, not just time or surface influences. This fine-level niche specialization shapes community structure in extreme cave environments.

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Area of Science:

  • Evolutionary Biology
  • Ecology
  • Speciation

Background:

  • Caves are extreme environments with unique faunas.
  • Cave-adapted species often exhibit convergent evolution in appearance, physiology, and behavior.
  • Morphological diversity in cave species is traditionally attributed to colonization time and surface ecological factors.

Purpose of the Study:

  • To test the hypothesis that morphological diversity in cave amphipods is driven by niche-based adaptations to microhabitats.
  • To investigate the relationship between microhabitat properties and specific morphological traits in subterranean crustaceans.
  • To understand the drivers of ecomorphological community structure in extreme cave environments.

Main Methods:

  • Analysis of seven cave amphipod (Niphargus) communities comprising 30 species.
  • Application of multivariate morphometrics to quantify morphological variation.
  • Utilized multinomial logit models with cross-validation and phylogenetic reconstruction.

Main Results:

  • Identified four distinct ecomorph classes (small pore, cave stream, cave lake, lake giants) within Niphargus species.
  • These ecomorphs were strongly associated with specific cave microhabitats.
  • Demonstrated independent phylogenetic origins for these ecomorph classes.
  • Showed that traits like antenna length correlate with microhabitat parameters (e.g., flow velocity).

Conclusions:

  • Morphological diversity in cave amphipods is primarily driven by fine-level niche partitioning within distinct microhabitats.
  • Community ecomorphological structure can converge under extreme environmental selection pressures.
  • Niche specialization, rather than temporal or broad ecological gradients, explains observed morphological diversity in these cave-dwelling crustaceans.