Volume 17, Issue 1 p. 31-50
ORIGINAL ARTICLE

Can immature stages be ignored in studies of forest leaf litter arthropod diversity? A test using Oxford Nanopore DNA barcoding

Martin Fikáček

Corresponding Author

Martin Fikáček

Department of Biological Sciences, National Sun Yat-sen University, Kaohsiung, Taiwan

Department of Entomology, National Museum, Prague, Czech Republic

Correspondence

Martin Fikáček, Department of Biological Sciences, National Sun Yat-sen University, No. 70, Lienhai Rd., Kaohsiung 80424, Taiwan.

Email: [email protected]

Contribution: Conceptualization, Methodology, Data curation, ​Investigation, Formal analysis, Supervision, Funding acquisition, Visualization, Project administration, Writing - original draft, Writing - review & editing

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Fang-Shuo Hu

Fang-Shuo Hu

Department of Biological Sciences, National Sun Yat-sen University, Kaohsiung, Taiwan

Contribution: Data curation, ​Investigation, Conceptualization, Writing - review & editing, Methodology, Formal analysis

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My-Hanh Le

My-Hanh Le

Biodiversity Research Center, Academia Sinica, Taipei, Taiwan

Contribution: Conceptualization, Methodology, Data curation, ​Investigation, Formal analysis, Resources, Writing - review & editing

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Jen-Pan Huang

Jen-Pan Huang

Biodiversity Research Center, Academia Sinica, Taipei, Taiwan

Contribution: Methodology, ​Investigation, Supervision, Resources, Writing - review & editing, Software, Project administration

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First published: 21 November 2023
Citations: 2
Editor: Yves Basset and Associate Editor: Michelle DiLeo

Abstract

  1. Forest soil and leaf litter support diverse arthropod mesofauna for which diversity dynamics is challenging to study due to the high number of species and specimens, small body size and limited taxonomic knowledge.
  2. Immature stages (larvae) are even harder to identify than adults, as their morphology is largely unknown. Therefore, larvae are often ignored, even though they may form a substantial proportion of specimens collected, are less mobile than adults and their exclusion may provide an incomplete diversity profile.
  3. Here, we use Oxford Nanopore DNA barcoding to investigate whether the inclusion of larvae provides a more complete taxonomic, phylogenetic and functional diversity profiles in leaf litter beetles (Coleoptera) from a subtropical forest in Taiwan.
  4. Our results indicate that larvae represent up to 38% of beetle specimens per sample, but most of them belong to 2–3 common species. Larvae of most beetle species are rarely collected repeatedly or in multiple specimens, possibly due to special habitat requirements or high seasonality.
  5. Taxonomic, phylogenetic and incidence-based functional diversity measures were not affected by the exclusion of larvae in the Staphylinidae dataset but were strongly biased in all-beetle dataset, especially when only common or abundant species were considered. Taxonomic beta diversity was not affected by the omission of larvae.
  6. Our results indicate that immature stages may be omitted in ecological studies of arthropods in case both adults and larvae co-occur in the same habitat, and the sites are sampled repeatedly. Caution is needed (1) in groups in which larvae and adults do not inhabit the same environment or strongly differ in biology, (2) when rare species are omitted or (3) when functional diversity is calculated from abundance data.

CONFLICT OF INTEREST STATEMENT

The authors declare no conflicts of interest.

DATA AVAILABILITY STATEMENT

All DNA barcodes used in this study have been published online in the BOLD database (Hu et al., 2023). The data used for all analyses in this study, including the incidence and abundance data, the morphological data used for functional diversity analyses, the alignments used to construct the tree for phylogenetic diversity analyses, the R scripts used for the data processing, and all results are available in Supporting Information S2–S8 and also from the Zenodo research archive under the following DOI: https://doi.org/10.5281/zenodo.8144203.