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01/30/2002 Env Bd Packet
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01/30/2002 Env Bd Packet
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Environmental Board
Env Bd Document Type
Env Bd Packet
Meeting Date
01/30/2002
Env Bd Meeting Type
Regular
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Ardea herodias <br />FRENCH: <br />Grand Hiron <br />SPANISH: <br />Garza morena, <br />Garza Manta granda, <br />Gatlinaza <br />Great <br />Blue <br />Heron <br />The Great Blue Heron is one of the most <br />widespread and adaptable wading birds <br />in North America. Up to seven subspecies <br />have been recognized by past researchers, based <br />on differences in size and plumage color, but a <br />single subspecies (herodias) probably suffices for <br />most of the continent, except for Florida's Great <br />White Heron (occidentalis), the subspecies most <br />distinctive in color (entirely white). Occidentalis <br />interbreeds freely with herodias to produce an <br />intermediate form, Wiirdemann's Heron of the <br />Florida Keys. This account focuses on both of <br />these subspecies: the continental Great Blue <br />Herons (A. h. herodias), sometimes referred to <br />as the herodias (or blue) group, and the Great <br />White Heron, the occidentalis (or white) <br />group. Both have received considerable <br />attention from researchers. <br />This species nests mostly in colonies, usually <br />large ones of several <br />hundred pairs. Such colonies <br />are often located on islands <br />or in wooded swamps, <br />isolated locations that <br />discourage predation by <br />snakes and mammals. <br />Although this species is <br />primarily a fish eater, <br />wading (often belly deep) <br />along the shoreline of oceans, <br />marshes, lakes, and rivers, it also stalks upland <br />fields for rodents, especially in winter. Its well- <br />studied, elaborate courtship displays have <br />correlates on the foraging grounds, where this <br />species can be strongly territorial. <br />ROBERT W. BUTLER <br />The <br />Birds of <br />North <br />America <br />Life Histories for <br />the 21st Century <br />Figure 1. <br />Breeding, nonbreeding, and year -round <br />ranges of A. herodias. The species is rare in <br />winter in the northern parts of its range. <br />Order CICONIIFORMES Family AREIDAE <br />
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