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Consequently, the term "gorgonian coral" is commonly handed to multiple species in the order Alcyonacea that produce a mineralized skeletal axis (or axial-like layer) composed of calcite and the proteinaceous material gorgonin only and corresponds to only one of several families within the formally accepted taxon Gorgoniidae (Scleractinia).
It is also found near the Mid-Atlantic Ridge south of Iceland. [14] P. arborea often grows on reefs created by the stony coral Lophelia pertusa. Like other gorgonians, it prefers exposed locations with strong currents. [15] Thus, is most commonly found in marine canyons and on the continental slope, where the slope is steep. [6]
National Geographic, with Alderfer, Paul Hess, and Noah Strycker, also published National Geographic Backyard Guide to the Birds of North America in 2011. A second edition was released in 2019. Like the pocket guide, this guide is 256 pages and outlines the 150 most common yard birds in North America.
Research has shown that measurements of the gorgonin and calcite within species of gorgonian corals can be useful in paleoclimatology and paleoceanography.Studies of the growth, composition, and structure of the skeleton of certain species of gorgonians, (e.g., Primnoa resedaeformis, and Plexaurella dichotoma) can be highly correlated with seasonal and climatic variation.
National Geographic logo. National Geographic is an American magazine that is noted for its cover stories and accompanying photography. [1] [2] [3] Throughout the 1980s National Geographic's cover stories showcased historical events such as the 1980 eruption of Mount St. Helens [4] and the effects of the weather phenomenon known as El Niño. [5]
Waterfowl flyways in the United States. The Atlantic Flyway is in violet. The Atlantic Flyway is a major north-south flyway for migratory birds in North America. The route generally starts in Greenland, then follows the Atlantic coast of Canada, then south down the Atlantic Coast of the United States to the tropical areas of South America and the Caribbean. [1]
This shearwater is 43–51 cm (16.9–20.1 in) in length with a 105–122 cm (3.5–4.0 ft) wingspan. It is identifiable by its size, dark upper parts, and white under parts, with the exception of a brown belly patch and dark shoulder markings.
Bird Sound. The northern fulmar (Fulmarus glacialis), fulmar, [2] or Arctic fulmar [3] is an abundant seabird found primarily in subarctic regions of the North Atlantic and North Pacific oceans. There has been one confirmed sighting in the Southern Hemisphere, with a single bird seen south of New Zealand. [4]