A sampling optimization analysis of soil-bugs diversity (Crustacea, Isopoda, Oniscidea)

Area of Science:

• Soil ecology
• Biodiversity research
• Invertebrate zoology

Background:

• Soil ecosystems harbor diverse invertebrates, including terrestrial isopods (Oniscidea), which play crucial ecological roles.
• Understanding soil bug diversity is vital for ecological assessments and conservation efforts.
• Previous studies have not fully optimized sampling strategies for terrestrial isopod monitoring.

Purpose of the Study:

• To optimize sampling effort for efficient monitoring of terrestrial isopod diversity.
• To analyze seasonal patterns in species composition and abundance.
• To understand the factors enabling the coexistence of multiple isopod species in a localized area.

Main Methods:

• Monthly pitfall trapping of terrestrial isopods over two years in the "Saline di Trapani e Paceco" Natural Reserve, Italy.
• Analysis of alpha- and beta-diversity using various ecological indices.
• Application of species abundance distributions, accumulation, and rarefaction curves to assess temporal biodiversity changes.

Main Results:

• Spring emerged as the optimal season for monitoring species richness and reducing sampling efforts for terrestrial isopods.
• Maximum individual abundances were observed between summer and autumn across both study years.
• Combined spring and summer-autumn sampling maximized beta-diversity assessments, capturing near total regional species richness (gamma-diversity).

Conclusions:

• Seasonal sampling strategies, particularly focusing on spring and summer-autumn, are crucial for comprehensive terrestrial isopod biodiversity assessment.
• Dynamic seasonal shifts in community composition may reduce interspecific competition and facilitate the coexistence of closely related species.
• Optimized sampling protocols can enhance the efficiency and effectiveness of monitoring soil invertebrate communities.