Sentences with phrase «whale population since»

NOAA has collected surveys of gray whale population since at least the 1960s.

Donna Hauser, Kristin Laidre, Harry Stern and colleagues examined changes in autumn migration timing of Beluga whale populations since the 1990s.

Not exact matches

Despite the long gap since then, mean concentration of the chemicals in the blubber of some populations of Europe's killer whales exceeds — often by a lot — a high threshold for health damage.

An international ban on commercial whaling was instituted in 1964 and the whale population has since rebounded.

[29][30] Since the original Asian and Atlantic populations have become seemingly extinct, it is difficult to figure the unique features among whales in these stocks, however, there have been observations of some whales showing distinctive, blackish body colors in recent years.

[27][28] Since the original Asian and Atlantic populations have become extinct, it is difficult to determine the unique features among whales in these stocks.

The Gray Whale Census, an official Gray Whale migration census that has been recording data on the migration of the Pacific Gray Whale has been keeping track of the population of the Pacific Gray Whale since 1985.

Since that time the humpback population has made a remarkable comeback and we now see humpback whales almost every day on our kayak tours off northern Vancouver Island.

Since that time, the population has grown to 26,000, similar to what it was before modern - day whaling.

By Al Zagofsky - Special to the Times News of Carbon County Pennsylvania April 17, 2004 petting whale Since whaling was banned in 1946, the California Gray Whale population has rebounded from near extinction to a population that has been estimated to be as high as 27whale Since whaling was banned in 1946, the California Gray Whale population has rebounded from near extinction to a population that has been estimated to be as high as 27Whale population has rebounded from near extinction to a population that has been estimated to be as high as 27,000.

Since the turn of the 21st century, Gray Whales has suffered many critical setbacks including a massive population collapse during 1999/2001 in which almost half the population died of starvation.