Priority wetland invertebrates as conservation surrogates

Area of Science:

• Ecology
• Conservation Biology
• Invertebrate Zoology

Background:

• Invertebrates are crucial ecosystem components but rarely used as biodiversity indicators.
• Priority species are candidates for indicating biological diversity, but their effectiveness is debated.

Purpose of the Study:

• To assess if three U.K. Biodiversity Action Plan freshwater invertebrates indicate richness, composition, and conservation importance of associated wetland organisms.
• To evaluate their role as surrogates for alpha diversity, beta diversity, and threat status.

Main Methods:

• Examined sites occupied by three priority gastropod species (Segmentina nitida, Anisus vorticulus, Valvata macrostoma).
• Assessed species richness, community composition (beta diversity), and conservation status of associated mollusks and macrophytes.
• Quantified changes in wetland types and niche-space under conservation management.

Main Results:

• Sites with priority gastropods showed higher gastropod species richness and conservation importance.
• These species characterized assemblages linked to significant variations in alpha and beta diversity.
• Conserving these species increased managed wetland types by 18% and gastropod niche-space by 33%.

Conclusions:

• Priority invertebrates are not superior indicators of alpha/beta diversity or conservation importance compared to non-priority species.
• Conserving priority species effectively broadens the range of protected wetland environments and their specialized biodiversity.
• A strategy involving multiple species with contrasting habitat needs is recommended for conservation surrogates.