. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage. Zoogeography -- Geographical distribution; Animal ecology. SWAMPS AND SHORES 487 cedure is possible because of the reduced food requirement of the trop- ical climate and the time for the development of the young is not so sharply limited. The guano production on tropical islands has been mentioned above (p. 171). Wherever rainfall is slight or absent, as on the islands off the coast of Peru, the bird excrement accumulates to depths of 7 to 30 m. Dried by the tropical sun, the gu
. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage. Zoogeography -- Geographical distribution; Animal ecology. SWAMPS AND SHORES 487 cedure is possible because of the reduced food requirement of the trop- ical climate and the time for the development of the young is not so sharply limited. The guano production on tropical islands has been mentioned above (p. 171). Wherever rainfall is slight or absent, as on the islands off the coast of Peru, the bird excrement accumulates to depths of 7 to 30 m. Dried by the tropical sun, the guano retains its nitrogen, which is not. Fig. 127.—Breeding place of Sterna juliginosa on Ascension. All the birds sit with the bill against the wind, to avoid ruffling of their feathers. After given off as NH3. More than ten million tons of high-grade guano were shipped from these islands between 1851 and 1872. The principal guano producers are the cormorant Phalacrocorax bougainvillii, a pelican (Pelecanus thagus), and next to these the boobies {Sula spp.). On the south island of the Chincha group a cormorant colony covers 60,000 sq. m., with three nests to the square meter, so that the assemblage includes 360,000 adult birds. Shear-waters {Puffinus) and dwarf pen- guins (Spheniscus demersus humboldti) breed in holes excavated in the guano. Lams dominicanus and two vultures* are the principal nest In coral islands used as breeding sites by oceanic birds situated in * Carthartes aura and Coragyps Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hesse, Richard, 1868-1944; Allee, W. C. (Warder Clyde), 1885-1955; Schmidt, Karl Patterson, 1890-1957. New York : J. Wiley & Sons, Inc. ; London : Chapman & Hall, Limited
Size: 1818px × 1374px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectanimalecology
