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June 1 - 3 , 1978 - University of Hawaii at Manoa

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Further evidence for resource sharina was found when both<br />

<<br />

species were reared from the same decaying Clermontia branches<br />

collected on Kahuku Ranch.<br />

The only ecological variables to which the two flies<br />

appeared to respond to differently were changes in moisture and<br />

pressure (th<strong>at</strong> is, lapse r<strong>at</strong>e) associ<strong>at</strong>ed with elev<strong>at</strong>ion.<br />

Results <strong>of</strong> past collections <strong>of</strong> these species from different<br />

elev<strong>at</strong>ions on Kahuku and Keauhou ranches, Kilauea Forest Reserve,<br />

'Ola'a forest, and kipukas on the Saddle Road, suggest th<strong>at</strong><br />

silvestris is more common <strong>at</strong> higher elev<strong>at</strong>ions. It is possible,<br />

however, th<strong>at</strong> silvestris may just have a wider range <strong>of</strong> eleva-<br />

tional distribution since it is always found where heteroneura<br />

occurs.<br />

LITERATURE CITED<br />

Ahearn, J.N., H.L. Carson, T.H. Dobzhansky, and K.Y. Kaneshiro.<br />

1974. Ethological isol<strong>at</strong>ion among three species <strong>of</strong> the<br />

planitibia subgroup <strong>of</strong> <strong>Hawaii</strong>an Drosophila. Proc. N<strong>at</strong>.<br />

Acad. Sci. 8. S. A. 71: 901-903.<br />

Carson, H.L., and K.Y. Kaneshiro. 1976. Drosophila <strong>of</strong> <strong>Hawaii</strong>.<br />

System<strong>at</strong>ics and ecological genetics. Ann. Rev. Ecol. Syst.<br />

7: 437-543.<br />

Carsan, H.L., and H.D. Stalker. 1968. Polytene chromosome<br />

rel<strong>at</strong>ionships in <strong>Hawaii</strong>an species <strong>of</strong> Drosophila. 11. The<br />

- D. planitibia subgroup. Univ. Texas Publ. 6818: 355-366.<br />

Kaneshiro, K.Y. 1976. Ethological isol<strong>at</strong>ion and phylogeny in<br />

the planitibia subgroup <strong>of</strong> <strong>Hawaii</strong>an Drosophila. Evolution<br />

30: 740-745.<br />

Kaneshiro, K.Y., and F.C. Val. 1977. N<strong>at</strong>ural hybridiz<strong>at</strong>ion<br />

between a symp<strong>at</strong>ric pair <strong>of</strong> <strong>Hawaii</strong>an ~roso~hila. Am.<br />

111: 897-902.<br />

N<strong>at</strong>.<br />

Loiselle, P.V., and G.W. Barlow. <strong>1978</strong>. Do fishes lek like<br />

birds? - In E.S. Reese, and F.J. Lighter, eds. Contrasts in<br />

behavior. Wiley-Interscience, New York.<br />

Spieth, H.T. 1966. Courtship behavior <strong>of</strong> endemic <strong>Hawaii</strong>an<br />

Drosophila. Univ. Texas Publ. 6615: 245-313.<br />

. 1968. Evolutionary implic<strong>at</strong>ions <strong>of</strong> sexual behavior in<br />

Drosophila. Pages 157-193 in T.H. Dobzhansky, M.K. Hecht,<br />

and W.M.C. Steere, eds. ~vzutionary biology. Vol. 2.<br />

Appleton-Century-Cr<strong>of</strong>ts, New York.<br />

Wilson, E.O. 1975. Sociobiology, the new synthesis. Belknap<br />

Press, Cambridge, Massachusetts. IX + 653 pp.

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