Enallagma Damselfly Occurrence Records Across the United States

Over 4,600 opportunistic occurrence records of Enallagma damselflies in the United States, compiled by Jason T. Bried in 2020. The data was used to investigate geographic patterns of species composition and turnover across spatial and phylogenetic scales. It includes validation against systematic presence/absence surveys.

Use Cases

• Analyze species turnover patterns across the United States using over 4,600 occurrence records.
• Investigate community structure at different phylogenetic scales (genus, major clades, subclades) within Enallagma.
• Compare opportunistic presence-only data patterns to systematic presence/absence survey benchmarks for validation.
• Model spatial patterns in species composition across watershed regions and environmental gradients.

Strengths

• Contains over 4,600 occurrence records, providing a substantial sample for analysis.
• Patterns from opportunistic data were validated against three sets of systematic presence/absence surveys.
• Covers a broad geographic scope across the United States and specific watershed regions.
• Data supports analysis at multiple phylogenetic scales within the Enallagma genus.

Limitations

• Data is presence-only (opportunistic records), lacking systematic absence information which limits certain community analyses.
• The dataset's spatial coverage may be uneven, reflecting biases inherent in opportunistic data collection.
• Temporal coverage and sampling frequency for individual records are not specified, limiting time-series applications.

Provenance

Source

Dryad digital repository.

Collection Method

Compilation of opportunistic (presence-only) species occurrence records.

Freshness

Last updated in June 2020.

Geography

United States, with specific analysis across watershed regions.