Archive for the ‘Predation’ Category

  • Predators

    Aug 18, 13 • 293 Views • PredationComments Off on Predators

    Sharks off the east coast of North America have declined precipitously in the last 15 years. The number of hammerhead sharks has dropped by 89%, threshers by 80%, great whites by 79%, oceanic whitetips by 70%, tigers by 65%, blues by 60% and makos by 40%...

  • Pacific Sleeper Shark Population Increasing

    Aug 18, 13 • 299 Views • PredationComments Off on Pacific Sleeper Shark Population Increasing

    Information suggests that Pacific sleeper shark abundance is increasing. Pacific sleeper shark data was analyzed from fishery independent longline surveys in the Gulf of Alaska and the Bering Sea to determine the trend in abundance and whether any change was...

  • Predation

    Aug 18, 13 • 297 Views • PredationComments Off on Predation

    Predators can impact ecosystems through the process of ‘top-down’ control, at times resulting in changes in species composition, changes in species diversity, and regime shifts. Top predators can also help stabilize ecosystems by keeping under...

  • American Crocodile

    Aug 17, 13 • 322 Views • PredationComments Off on American Crocodile

    Written by: Mary Sweeters American crocodiles live in both freshwater and brackish habitats along the coast, including estuaries, lagoons, and mangrove swamps. Some populations have been found in surprising locations, including the cooling canals outside of...

  • Salmon Shark Migrations

    Aug 17, 13 • 330 Views • PredationComments Off on Salmon Shark Migrations

    The primary objectives of the Alaska Shark Assessment Program is to understand the increase of sharks in the northeast Pacific, and what the increased shark population means for Alaska marine ecosystems. The reasons for these increases may be: An ocean...

  • Bald Eagles in Alaska

    Aug 17, 13 • 344 Views • PredationComments Off on Bald Eagles in Alaska

    What is it about bald eagles (Haliaeetus leucocephalus) that catches the eye of people? Is it simply their size or striking appearance? Is it the power they display or the majesty they symbolize? Ever since man first entered the kingdom of the bald eagle more...

  • Alaska Shark Assessment Program

    Aug 17, 13 • 350 Views • PredationComments Off on Alaska Shark Assessment Program

    Alaska Shark Assessment Program In 1999 Bruce Wright created the Alaska Shark Assessment Program in response to many reports, mostly from fishermen, that sharks abundances in the north Pacific Ocean are at the highest levels ever observed. Of the ten shark...

  • White Tailed Kite (Elanus leucurus)

    Aug 17, 13 • 359 Views • PredationComments Off on White Tailed Kite (Elanus leucurus)

    White-tailed kites, Elanus leucurus, once ranged from Georgia to Florida, across the southern United States and northern Mexico, to California and Oregon. The population was decimated during the 1800s and early 1900s. The medium sized raptor was shot as an...

  • Spiny Dogfish Shark (Squalus acanthias)

    Aug 17, 13 • 360 Views • PredationComments Off on Spiny Dogfish Shark (Squalus acanthias)

    As their name suggests, spiny dogfish sharks (Squalus acanthias) have sharp spines in front of each dorsal fin. Their bodies are dark gray above and white below, often with white spotting on the sides. They are marketed as “rock shark”,...

  • Salmon Shark Facts (Lamna ditropis)

    Aug 17, 13 • 490 Views • PredationComments Off on Salmon Shark Facts (Lamna ditropis)

    Salmon sharks (Lamna ditropis) are large, powerful, warm-bodied (endothermic), and streamlined predators adapted for high-speed swimming. Reports from the U.S. Navy have clocked salmon sharks exceeding 50 knots. This would make the salmon shark one of the...