Targeted hybridization capture enables comprehensive detection of freshwater bioassessment invertebrates from environmental DNA

Verdict. Here, we evaluated targeted hybridization capture of mitochondrial cytochrome oxidase I (COI) target sequences as a unified molecular approach for cross-phylum freshwater bioassessment. It primarily advances mechanistic understanding rather than explicit pathology endpoints.

What the authors report

Freshwater bioassessment relies on assessing aquatic assemblages to infer ecological conditions, yet conventional surveys require extensive field sampling, specimen processing, and specialized taxonomic expertise. Existing environmental DNA (eDNA) methods have not yet provided a practical alternative to conventional macroinvertebrate assays in part because current approaches cannot feasibly recover broad taxonomic diversity at sufficient taxonomic resolution.

Key results stated in the abstract include the following. Here, we evaluated targeted hybridization capture of mitochondrial cytochrome oxidase I (COI) target sequences as a unified molecular approach for cross-phylum freshwater bioassessment. Environmental DNA was collected at 18 sites along 63 km of Boulder Creek spanning nearly 1,500 m of elevation from forested headwaters to agricultural plains. Hybridization capture increased recovery of COI sequences ∼1,760-fold relative to unenriched shotgun libraries, generating Folmer-region COI contigs that averaged ∼400 bp.

Why it matters for mitochondrial biology

Within mitochondrial research, this work maps primarily to redox biology. The abstract does not lean heavily on pathology language; the contribution appears more mechanistic or systems-level than clinical. Server: biorxiv. Posted 2026-08-17. Synthesis confidence is bounded by abstract completeness.

Study design (abstract-level)

Existing environmental DNA (eDNA) methods have not yet provided a practical alternative to conventional macroinvertebrate assays in part because current approaches cannot feasibly recover broad taxonomic diversity at sufficient taxonomic resolution. Here, we evaluated targeted hybridization capture of mitochondrial cytochrome oxidase I (COI) target sequences as a unified molecular approach for cross-phylum freshwater bioassessment. Hybridization capture increased recovery of COI sequences ∼1,760-fold relative to unenriched shotgun libraries, generating Folmer-region COI contigs that averaged ∼400 bp.

Principal findings

1. Here, we evaluated targeted hybridization capture of mitochondrial cytochrome oxidase I (COI) target sequences as a unified molecular approach for cross-phylum freshwater bioassessment.
2. Environmental DNA was collected at 18 sites along 63 km of Boulder Creek spanning nearly 1,500 m of elevation from forested headwaters to agricultural plains.
3. Hybridization capture increased recovery of COI sequences ∼1,760-fold relative to unenriched shotgun libraries, generating Folmer-region COI contigs that averaged ∼400 bp.
4. Across the watershed, we recovered sequences for approximately 450 macroinvertebrate genera across 8 phyla.
5. These results demonstrate that targeted hybridization capture enables robust, cross-phylum detection of species used for freshwater bioassessment from environmental DNA.

Limitations of this brief

• This Mitos brief is an abstract-level synthesis of a preprint; it is not peer review and not a substitute for reading the full paper.
• Preprint status: findings may change with revision or journal review.
• Effect sizes, n numbers, statistics, and full experimental controls are typically incomplete at abstract resolution.
• Comparator/control language is weak or absent in the abstract, limiting causal inference from this brief alone.
• Primary source: biorxiv DOI 10.64898/2026.08.14.744904 (posted 2026-08-17).

Open scientific questions

• Which specific experimental panels in the full paper establish the strongest causal claim, and how robust are the controls?
• How do these findings sit relative to prior literature on the same pathway—replication, contradiction, or incremental extension?

Bottom line

For mitochondrial biologists focused on redox biology, this preprint is worth full-text review if the topic matches your program. Abstract-level takeaway: Here, we evaluated targeted hybridization capture of mitochondrial cytochrome oxidase I (COI) target sequences as a unified molecular approach for cross-phylum freshwater bioassessment. Confirm methods, effect sizes, and controls in the full PDF before citing the result as established.

Bibliographic record

Abstract-based editorial synthesis by Mitos. Not peer review.