This study investigates whether Steller sea lion declines in the early 1980s were associated with severely low juvenile survivorship, whereas declines in the 1990s were associated with disproportionately low fecundity.
A gonadotropin-releasing hormone was evaluated for its effectiveness in reducing testosterone in wild Hawaiian monk seals with results suggesting it may be a useful tool for reducing mortality with adult male aggression related to reproduction and mating.
We studied reproductive rate, length of lactation period, pup survival, and mortality of injured and uninjured female Hawaiian monk seals on Laysan Island, northwestern Hawaiian Islands, in 1983 – 1989.
The pelage of the adult seal is composed of clearly defined bundles, each with a coarse guard hair and 35 to 40 fine underfur hairs; there are more than 300,000 fibers to the square inch.