. Animal ecology. Animal ecology. DISTRIBUTION OF ANIMAL COMMUNITIES 15 rivers and standing waters contain considerably more salts ( places like the Norfolk Broads or the meres of Lancashire and Cheshire). Then there is a rather sudden increase in the steepness of the gradient through brackish water lagoons and estuaries to the sea itself. The sea, having been there Kllepora. ichotema n. Iruncota Sxitnphytum hirhinv S poimcSuJrk Heliopora corrulia. Seriafopora. hyiOrix I ft}^ri|fOfiA23NE|''^)J'|^|A«OPORA 2DNE| SCLEROPHYTUM ZONE \8Q\UilR ZONES F • paUida. Fav\tiii abdita Coiioitnea pet^nafc
. Animal ecology. Animal ecology. DISTRIBUTION OF ANIMAL COMMUNITIES 15 rivers and standing waters contain considerably more salts ( places like the Norfolk Broads or the meres of Lancashire and Cheshire). Then there is a rather sudden increase in the steepness of the gradient through brackish water lagoons and estuaries to the sea itself. The sea, having been there Kllepora. ichotema n. Iruncota Sxitnphytum hirhinv S poimcSuJrk Heliopora corrulia. Seriafopora. hyiOrix I ft}^ri|fOfiA23NE|''^)J'|^|A«OPORA 2DNE| SCLEROPHYTUM ZONE \8Q\UilR ZONES F • paUida. Fav\tiii abdita Coiioitnea pet^nafc, Pavona dianai P vca\a/is Montipcr* ranoio. M. hopida M. foliosa. Acropora .smifhi A. hOLfnA A qufteki A. pKaraoiuiipcijriKrftia Qofiopora. ttn^udtns fbrt«4 froqOKX Hahwtdicn- »p LthetHunnvtn hrmo o-uJtoceo. i The thickness of the black stripes indicates the abundance of each species at various distances from "the shore. Fig. 1.—Zonation of corals (together with a few calcareous algae) on a reef in the New Hebrides, showing that the phenomenon of dominance exists among corals, just as among plants. The left-hand side of the diagram is the shore of the island, while the right-hand side is the outer edge of the reef. (From Baker.^°*) much longer than the inland lakes and ponds, contains enor- mously more salts than the latter, but really it is only one end of a gradient which started high up in the mountains. There are well-marked different associations of animals in all these types of waters. Of course, other factors than salt content. 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 Elton, Charles S. (Charles Sutherland), 1900-. New York, Macmillan Co.
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyorkmacmillanco
