Blue Whale Sightings in the Gulf of St. Lawrence 1980-2008

29 years of blue whale sightings data were collected by the Mingan Island Cetacean Study from 1980 to 2008 during annual surveys. The project aimed to inform critical habitat designation under the Canadian Species at Risk Act, with detailed analysis of sightings per kilometer of effort in 3x3 km grid cells for 2000-2008.

Use Cases

• Analyze spatial distribution patterns of sightings within the 3x3 km grid cells to identify high-density areas.
• Model annual occurrence trends from 1980 to 2008 to assess population changes over time.
• Correlate sighting density with survey effort (km of effort) to standardize encounter rates.
• Map critical habitat zones using geospatial data (SHP, ESRI REST) on whale sightings.

Strengths

• 29-year temporal coverage from 1980 to 2008 provides a long-term ecological record.
• Data collection involved close approaches from inflatable boats for accurate photographic and biopsy identification.
• Analysis includes sightings standardized per kilometer of survey effort, enhancing comparability.
• Geospatial data formats (SHP, ESRI REST) enable detailed mapping and spatial analysis.

Limitations

• Sample data and specific column definitions are unavailable, limiting understanding of data structure.
• The core density analysis is limited to the 2000-2008 period, not the full 29-year record.
• Spatial coverage is restricted to the Gulf of St. Lawrence, limiting broader geographic inference.

Provenance

Source

Mingan Island Cetacean Study (MICS), published by Fisheries and Oceans Canada.

Collection Method

Annual visual surveys conducted from inflatable boats between May and November, enabling close approaches for photography and biopsy sampling.

Time Range

1980 to 2008, with detailed analysis for 2000-2008.

Freshness

Data last updated in March 2026, though the underlying observations end in 2008.

Geography

Estuary and Gulf of St. Lawrence, Canada.