Predation

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% (Baum et al....

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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 control the effects of...

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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 the Turkey...

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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 climate regime...

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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 than...

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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 species...

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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 another...

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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", "rock cod" or "rock salmon" and...

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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 fastest fish...

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Alaskan Brown Bear Ecology

As large carnivores, Alaska brown bears range over great expanses of land, sometimes as much as 150 square miles for a single bear. In addition, brown bears depend upon such land features and associated animals and plants as alpine, slopes, sedge meadows, salmon...

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