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Invertebrate Richness and Hatching Decrease with Sediment Depth in Neotropical Intermittent Ponds.

Pedro Henrique de Oliveira Hoffmann¹, Andressa Adolfo², Allana Gonçalves Piu²

¹Instituto de Ciências Biológicas, Programa de Pós-graduação em Biologia de Ambientes Aquáticos Continentais, Universidade Federal do Rio Grande - FURG, Avenida Itália, km 8, 96203-900 Rio Grande, RS Brazil.

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Summary

Invertebrate dormant stages in temporary ponds show reduced hatching success with increasing sediment depth. This research reveals how aquatic invertebrate communities in wetlands can recover after droughts.

Keywords:

Dormant stages Invertebrate hatchlings Sediment column Temporary wetlands Viability

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Area of Science:

Ecology
Aquatic Biology
Environmental Science

Background:

Invertebrates in intermittent wetlands utilize dormant stages to survive environmental fluctuations.
Dormancy is a crucial survival strategy for persisting in extreme aquatic habitats like temporary ponds.

Purpose of the Study:

To investigate the hatching responses of invertebrate dormant stages across varying sediment depths in intermittent ponds.
To test the hypotheses that invertebrate hatchling richness and abundance decrease with sediment depth, and that hatchling composition varies with depth.

Main Methods:

Collected sediment cores (30 cm depth) from four intermittent ponds in southern Brazil.
Stratified sediment cores into 1 cm slices to analyze dormant stages.
Quantified and identified hatchlings from each sediment stratum.

Main Results:

A total of 1,931 hatchlings from 31 taxa were recovered.
Invertebrate hatchling richness and abundance (excluding bdelloid taxa) were negatively correlated with sediment depth.
The composition of aquatic invertebrates significantly varied across different sediment strata.

Conclusions:

Sediment depth influences the hatching success and community composition of dormant invertebrates in temporary wetlands.
Understanding these patterns is vital for assessing the resilience of aquatic communities in climate-vulnerable intermittent ecosystems following drought events.