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Compositional changes in bee and wasp communities along Neotropical mountain altitudinal gradient.

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Species richness and abundance of bees and wasps decrease with altitude in tropical mountains. Beta-diversity is driven by species turnover, with Moericke traps proving more effective for altitudinal surveys.

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Area of Science:

  • Ecology
  • Zoology
  • Biodiversity research

Background:

  • Species richness often declines with increasing altitude, a pattern well-documented in tropical mountains.
  • However, determinants of beta-diversity variation across altitudinal gradients remain understudied.
  • Hymenoptera: Aculeata communities are key indicators of ecosystem health.

Purpose of the Study:

  • To investigate altitudinal patterns of bee and wasp (Hymenoptera: Aculeata) diversity in a Brazilian tropical mountain region.
  • To identify environmental factors influencing species richness and abundance along an altitudinal gradient.
  • To analyze the drivers of beta-diversity (turnover vs. nestedness) and community similarity.

Main Methods:

  • Sampling of bee and wasp communities across an altitudinal gradient (1,000–2,000 m.a.s.l.) using trap nests and Moericke traps.
  • Correlation analysis of species richness and abundance with climatic variables (temperature, precipitation, water vapor pressure, wind speed) and altitude.
  • Assessment of beta-diversity components and community similarity across sampling sites.

Main Results:

  • A negative correlation was observed between altitude and species richness/abundance.
  • Climatic factors (temperature, precipitation, water vapor pressure, wind speed) influenced species richness and abundance.
  • Species turnover was the primary driver of beta-diversity, and Aculeate community similarity increased with altitudinal proximity.

Conclusions:

  • Altitudinal gradients significantly impact Hymenoptera: Aculeata communities in tropical mountains.
  • Moericke traps demonstrated higher efficiency than nest traps for altitudinal diversity surveys.
  • The high proportion of rare species underscores the necessity of long-term monitoring for comprehensive hymenopteran diversity assessment.