Day and Night Faunal Census Across 54 Australian Reefs

54 shallow tropical and temperate reefs around Australia were surveyed using paired day and night visual census. The data quantifies diel partitioning of fish and invertebrate communities, showing distinct occupancy patterns between sunlit and nocturnal hours. Tropical reefs exhibited pronounced differences, with 64% of all species and 71% of all individuals observed only during the day.

Use Cases

• Analyze diel partitioning by comparing species richness and biomass of predatory and herbivorous diurnal fishes against nocturnal invertebrate emergence.
• Model community structure shifts by assessing the distinct and opposing diel occupancy of fishes and invertebrates on coral reefs.
• Investigate top-down pressures by correlating limited nocturnal emergence of temperate invertebrates with small diel changes in fish activity on temperate reefs.
• Quantify nocturnal contributions to biodiversity by calculating the percentage of species and individuals observed exclusively at night (56% and 45% respectively for tropical invertebrates).

Strengths

• Data is derived from a continental-scale study across 54 distinct reef sites.
• Explicitly quantifies diel patterns, a factor often overlooked in ecological monitoring.
• Provides paired day and night observations, enabling direct comparison of faunal assemblages.

Limitations

• Sample data and specific column structure are unavailable, limiting immediate analytical use.
• The dataset appears to be a summary of findings (PNG, HTML) rather than raw observational records.
• Geographic scope is limited to Australian reefs, which may not represent global patterns.

Provenance

Source

Australian Ocean Data Network

Collection Method

Paired day and night visual census surveys.

Freshness

Last updated March 2026.

Geography

54 shallow tropical and temperate reefs around Australia.