1990 data from a colony near Big Razorback Island, McMurdo Sound investigates hormonal and metabolic changes in Weddell seals during lactation. The study collected blood samples from lactating and non-lactating seals at frequent intervals, measuring secretory profiles of growth hormone, cortisol, and melatonin. It was conducted by SCIOPS.
Use Cases
- Analyze growth hormone secretory profiles from plasma samples taken at 20-minute intervals to understand lactation physiology.
- Compare cortisol and melatonin levels between lactating and non-lactating females to study the absence of diurnal patterns.
- Evaluate metabolic state data from blood chemical analysis to investigate fasting adaptations.
- Study pineal gland function via melatonin secretion response to desipramine injection in non-lactating cows.
Strengths
- Data includes high-frequency sampling (20-minute intervals for up to 12 hours) for detailed temporal profiles.
- Study design compares multiple groups: lactating seals with pups, non-lactating seals, and subjects undergoing pharmacological tests.
Limitations
- Sample size is limited, with blood taken from only 5 lactating seals and 3 non-lactating seals for the intensive profiling.
- Data is from a single colony (Big Razorback Island), limiting geographic generalization.
- Data collection occurred in 1990, making findings potentially stale for contemporary comparative studies.
Provenance
- Source
- SCIOPS via NASA EarthData.
- Collection Method
- Blood sampling from seals at frequent intervals for plasma analysis, including chemical tests and pharmacological challenge (desipramine injection).
- Time Range
- 1990.
- Freshness
- 1990-12-04
- Geography
- Colony near Big Razorback Island, McMurdo Sound.