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3 The New York Years (1931–1953)

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156 4 Ornithologist and Zoogeographer<br />

Examples of two superspecies of birds of paradise, Mayr’s favorite birds 4 ,are<br />

illustratedinFigs.4.5and4.6.Charactergradientsacrosshybridzonesoccurin<br />

the Greater Birds of Paradise, geographical isolation and conspicuous differentiation<br />

is demonstrated in the Paradise Magpies. In a study of the Ribbon-tailed<br />

Bird of Paradise (Astrapia mayeri) Mayr and Gilliard (1952a) discussed the Astrapia<br />

superspecies. A. mayeri differs conspicuously from its representatives to the<br />

west (A. splendidissima) and to the east (A. stephaniae) but some gene flow exists<br />

between stephaniae and mayeri in the area where they have come into contact<br />

during recent geological time. <strong>The</strong>se latter taxa are very close biologically. Partial<br />

overlap of closely related species occurs in the paradise kingfishers of the genus<br />

Tanysiptera (Fig. 4.7). During the Pleistocene T. hydrocharis wasisolatedonan<br />

island stretching from the Aru Islands to the mouth of the Fly River and thus<br />

separated from the mainland form galatea by a branch of the ocean. When this<br />

Fig.4.7. Species and subspecies of the Paradise Kingfishers, Tanysiptera hydrocharis-galatea<br />

group.<strong>The</strong>subspecies1,2,and3ofgalatea on the mainland of <strong>New</strong> Guinea are exceedingly<br />

similar to each other. <strong>The</strong> subspecies vulcani (4) and rosseliana (5, on Rossel Island east of<br />

<strong>New</strong> Guinea, not shown) are much more distinct. <strong>The</strong> populations on Biak (6), Numfor (7),<br />

and Koffiao (8) have reached species level. <strong>The</strong> form on Aru Island, hydrocharis (H1), has<br />

also reached species rank and now coexists in southern <strong>New</strong> Guinea (H2) with a subspecies<br />

of galatea (3); slightly modified from Mayr (1942e, Fig. 15)<br />

4 In the foreword to Gilliard’s book on the birds of paradise and bower birds, Mayr wrote:<br />

“Every ornithologist and birdwatcher has his favorite group of birds, whether they be<br />

nightingales or storks, hummingbirds or penguins. Frankly, my own are the birds of<br />

paradise and bower birds, […] for in their ornamentation and courtship behavior birds<br />

of paradise are not surpassed in the whole class of Aves” (1969f).

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