LATEST ARTICLES

american crocodile
American Crocodile Written by: Mary SweetersCrocodiles (crocodylus acutus) generally fall under the specific reptile group called crocodilians. The crocodilians have 23 species that are found in different parts of the world and two of those are native to the US. These two species are the American crocodile and the American alligator.The American crocodile can also be found in Venezuela, Jamaica, Cuba,...

Predators

Great white shark in ocrean
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. 2002). Canadian scientists estimate the population of oceanic whitetip sharks...
pacific sleeper shark
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 statistically significant. Relative population numbers of Pacific sleeper sharks captured in the NOAA Fisheries domestic sablefish longline surveys increased...

Predation

predatory hawk flying
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 more abundant smaller predators. Accordingly, understanding predators is essential to understanding how ecosystems function. The Conservation Science Institute's Ocean Initiative's...
map tracking the movements of salmon shark
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 shift characterized by warmer ocean temperatures beginning in the late 1970's The ocean climate regime shift triggered...
spiny dogfish near ocean floor bed
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 are often eaten in Europe and used for En