These two causes of mortality are significant given the precarious state of the western population. Harbor seals grew from a Salish Sea population of 8,600 in 1975 to 77,800 in 2015, and their diet includes a greater percentage of Chinook smolts than seals in other areas. The marine iguana is the only lizard in the world with the ability to live and forage at sea and is endemic to the Galapagos Archipelago. Forty percent. There are six very similar subspecies, each from different islands, with those from Isabela and Fernandina being the largest. Steller sea lion numbers have been declining in recent years in the southern end of the species' range in central California where habitat concerns include reduced prey availability, contaminants and disease. In Alaska, Steller sea lions range from southeastern Alaska north and west through the Gulf of Alaska, along the Aleutian Islands chain and into the Bering Sea. Read an updated version of this article published February 2017: Eradicating Lionfish Unfortunate accidents in the early 90's have led to their invasion and spread across much of the Caribbean Sea and as far north up the east coast to Rhode Island. At the end of the activity, the number of sea lions per round (year) should be graphed with years on the x-axis and population size on the y-axis. Thousands of California sea lions gather on the beaches of San Miguel Island each year for … That’s the stunning population loss for polar bears in the southern Beaufort Sea. Consequently, harbor seals in the Salish Sea consume about 86 percent of all the Chinook eaten as smolts along the West Coast. The news comes from a new study linking the dramatic decline in this polar bear subpopulation in northeast Alaska and Canada to a loss of sea ice due to climate change. Evidence is mounting that the size of the Australian sea lion population has levelled off and may be declining, and calls are being made for more intensive research into the species. Although, they do not live long in our cooler waters and are unable to survive the tougher winters (Kimball et al. Recent research has shown unexplained dramatic fluctuations in pup mortality rates which may be endangering the species. 10. From 1900 until the early 1930s, Oregon paid a bounty of up to $10 per dead sea lion to make it harder for them to compete with commercial fishermen. The sea lion population dropped to just over 250,000 in 2013 and 2014. 2004). Steller Sea Lion Research Population Vital Rates. Ask students to name three components of habitat and to define a limiting factor.
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