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Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
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Climbing the elevational gradient: Diatom diversity patterns across temporary ponds.

Davide Taurozzi1, Massimiliano Scalici2

  • 1Department of Sciences, University of Roma Tre, Viale G. Marconi 446, 00146, Rome, Italy.

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Diatom diversity in temporary ponds is shaped by elevation and water chemistry, not seasonality. Protecting diverse elevations is crucial for conserving these vulnerable aquatic habitats.

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Area of Science:

  • Ecology
  • Environmental Science
  • Biodiversity Studies

Background:

  • Temporary ponds are vulnerable ecosystems with historically underestimated ecological importance.
  • Diatoms are key bioindicators for assessing the health and conservation status of temporary aquatic environments.

Purpose of the Study:

  • To investigate diatom alpha and beta diversity patterns across an elevation gradient in temporary ponds.
  • To assess the influence of environmental, local, and seasonal factors on diatom communities.
  • To understand how elevation impacts diatom diversity and community structure.

Main Methods:

  • Conducted year-round sampling in six temporary ponds along an altitudinal gradient.
  • Analyzed diatom species richness and diversity indices (Shannon, Simpson).
  • Modeled the influence of pH, electrical conductivity (EC), and elevation on diversity.

Main Results:

  • Species richness did not differ significantly between low-elevation (LP) and high-elevation (HP) ponds.
  • Shannon diversity was lower in LP ponds, indicating less even communities.
  • Elevation was the primary driver of Shannon and Simpson diversity, while EC strongly influenced alpha diversity.
  • Community similarity decreased with elevation, showing rapid species turnover.

Conclusions:

  • Diatom communities in temporary ponds are significantly structured by elevational and physicochemical gradients.
  • These findings highlight the sensitivity of diatom communities to environmental changes like climate shifts and pollution.
  • Conservation strategies should focus on protecting a range of habitats across different elevations to maintain regional biodiversity.