Ocean Disease

Ocean diseases are spreading, and scientists aren't sure if these are simply isolated occurrences or a sign of a larger problem. Disease is increasing among most kinds of marine organisms, according to a long term study by Cornell University and the National Center for Ecological Analysis and Synthesis (Ward and Lafferty. 2004). The study implicates a host of factors,...
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 English fish and chips. This...
brown bear and cub in green field
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 streams, and old growth forests. These areas satisfy seasonal needs for feeding, winter denning, raising cubs,...
large school of fish
Ocean Acidification Bad for Shells and Reefs Rising levels of atmospheric carbon due to fossil fuel emissions have made seawater more acidic. Now, two new studies show that increasing acidification could wreak havoc on marine organisms that build their shells and skeletons from calcium carbonate. Since these creatures provide essential food and habitat for other ocean dwellers, the effects could...
two men holding bald eagle
Bald eagles (Haliaeetus leucocephalus) are a member of the Accipitridae family, which also includes hawks, kites, and old-world vultures. Scientists loosely divide eagles into four groups based on their physical characteristics and behavior. The bald eagle is a sea or fish eagle. The adults have a blackish-brown back and breast; a white head, neck, and tail; and yellow feet and...
By Asc1733 - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=47649920
Human activities degrade ecosystems. This has been obvious for millennia in terrestrial and fresh-water systems, but it became obvious only recently in marine systems. Examples of degraded marine ecosystems are numerous, but the causes of these changes are uncertain because of inherent difficulties in studying marine systems. One theme of questions focuses on distinguishing degrees to which various physical...
Coal worker in Linfen
Millions of global citizens live in areas where toxins shorten lives. Here are perhaps ten of the most polluted cities in the world. The primary pollutant in each city is noted in parentheses: 10. Sumgayit, Azerbaijan (petrochemicals) This is another city that suffered from generations of environmental neglect in the former Soviet Union. The indiscriminate discharge of industrial pollutants into the...