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SOUTHERN ZONE

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Originally appearing in Volume V14, Page 270 of the 1911 Encyclopedia Britannica.
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SOUTHERN See also:ZONE .—The boundaries of this zone have been indicated in the description of the See also:equatorial zone; they over-See also:lap the southern boundaries of the latter in See also:South See also:Australia and South See also:America, but we have not the means of defining the limits to which southern types extend northwards. This zone includes See also:Tasmania, with at least a portion of south-eastern Australia (Tasmanian sub-region), New See also:Zealand and the See also:Auckland Islands (New Zealand sub-region), and See also:Chile, See also:Patagonia, Tierra del Fuego and the See also:Falkland Islands (Fuegian sub-region). No See also:freshwater fishes are known from Kerguelen's See also:Land, or from islands beyond 55° S. See also:lat. The Tropical See also:American region is the richest (about 1300 See also:species) ; next follow the See also:African region (about r000), the See also:Indian region (about 800), the Europaeo-See also:Asiatic region (about 500), the See also:North American region (about 400), the Tropical Pacific region (about 6o) ; whilst the See also:Antarctic region is quite insignificant. Of the migratory fishes, or fishes travelling regularly from the See also:sea to fresh See also:waters, most, if not all, were derived from marine forms. The anadromous forms, annually or periodically ascending See also:rivers for the purpose of spawning, such as several species of Acipenser, Salmo, Coregonus, Clupea (shads), and Petromyzon, are only known from the See also:northern hemisphere, whilst the catadromous forms, spending most of their See also:life in fresh See also:water but resorting to the sea to breed, such as See also:Anguilla, some species of Mugil, Galaxias and Pleuronectes, have representatives in both hemispheres. (G. A.

End of Article: SOUTHERN ZONE

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