King Penguin Diet and Foraging Patterns at Heard Island

Stomach contents from 98 adult King penguins at Heard Island reveal their 1992 diet was 94% by number the myctophid fish Krefftichthys anderssoni. The dataset includes satellite tracking data from 23 penguins at Macquarie Island in 1998-1999, estimating a primary foraging area of 36,500 square kilometers. Data originates from ASAC Project 465, managed by the Australian Antarctic Data Centre.

Use Cases

• Analyze seasonal variation in diet_energy_content_kJ_g to correlate with chick malnutrition events.
• Model foraging_travel_distance_km and foraging_zone_area_sq_km from satellite tracking data to assess marine protected area overlap.
• Calculate the mass_percentage contribution of prey species like Champsocephalus gunnari to understand winter diet shifts.
• Estimate total_food_consumption_kg per adult and energy_required_to_rear_chick_MJ for population energy budget models.

Strengths

• Diet composition data from 98 individual penguin stomach samples provides a detailed snapshot.
• Satellite tracking covers 23 penguins, defining a total foraging area of 156,000 square kilometers.
• Data includes precise mass and number percentages for multiple prey species across seasons.

Limitations

• Sample sizes are modest (98 for diet, 23 for tracking), limiting statistical power for sub-group analysis.
• Primary data collection occurred in 1992 and 1998-1999, which may not reflect current ecosystem conditions.
• Geographic focus is limited to two specific sub-Antarctic islands (Heard and Macquarie).

Provenance

Source

ASAC Project 465, Australian Antarctic Data Centre (AU_AADC).

Collection Method

Stomach content analysis of captured penguins and satellite telemetry tracking.

Time Range

1992 for diet data; 1998-1999 for tracking data.

Geography

Heard Island (53°05'S, 73°30'E) and Macquarie Island, Southern Ocean.