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<br />DOUGlAS ET AL.-GlLA GEOMETRIC MORPHOMETRICS
<br />
<br />397
<br />
<br />
<br />er basin populations (Dowling and DeMarais,
<br />1993). Although morphological analyses can
<br />designate individuals to species or groups, these
<br />techniques alone cannot unambiguously ascer-
<br />tain the degree of introgression exhibited by in-
<br />dividuals or populations or even if hybridization
<br />has occurred. Instead, morphology can discrim-
<br />inate individuals once the range of genetic var-
<br />iance has been determined (as in Sofield et aI.,
<br />1984). A morphological range of variation has
<br />been established for upper basin Gila (McElroy
<br />and Douglas, 1995; this study). All that remains
<br />is for these results to be linked with those from
<br />genetic analyses. Only then will questions about
<br />morphological intermediacy of populations and
<br />species be unambiguously determined.
<br />
<br />ACKNOWLEDGMENTS
<br />
<br />
<br />Numerous individuals from the following
<br />agencies, organizations, and institutions assisted
<br />at various levels with development and comple-
<br />tion of this project: Arizona Game and Fish De-
<br />partment (AGFD: Phoenix); Arizona State Uni-
<br />versity (ASU: Tempe); Bio/West, Ine. (Logan,
<br />UT); Brigham Young University (BYU: Provo,
<br />UT); Bureau of Reclamation (BOR: Salt Lake
<br />City, UT); Colorado Department of Wildlife
<br />(CDOW: Denver, Grand Junction, Ft. Collins);
<br />National Museum of Natural History (NMNH:
<br />Washington, DC); U.S. Fish and Wildlife Service
<br />(USFWS: Parker, AZ; Grand Junction, CO; Salt
<br />Lake City, UT; Vernal, UT); and Utah Depart-
<br />ment of Wildlife Resources (UDWR: Moab,
<br />Price, Salt Lake City, Vernal). Scientific collect-
<br />ing permits are acknowledged from the states
<br />of Arizona, Colorado, Utah, and from the U.S.
<br />National Park Service, as is a USFWS endan-
<br />gered species subpermit (PRT-676811). This re-
<br />search was supported by contract (I-CS-4O-
<br />0970A) between BOR and ASU,
<br />
<br />LITERATURE CITED
<br />
<br />ADAMS, D. c., AND F. J. ROHLF. 2000. Ecological char-
<br />acter displacement in Plethodon: biomechanical dif-
<br />ferences found from a geometric morphometric
<br />study. Proc. Nat. Acad. Sci. 97:4106-4111.
<br />BLACKlTH, R. E., AND R. A. REYMENT. 1971. Multivar-
<br />iate morphometrics. Academic Press, New York.
<br />BOOKSTEIN, F. L. 1989a. "Size and shape": a com-
<br />ment on semantics. Syst. Zool. 38:173-180.
<br />-. 1989b. Principal warps: thin-plate splines and
<br />the decomposition of deformations. IEEE Trans.
<br />Pattern Analysis Machine Intelligence 11:567-585.
<br />-'--. 1991. Morphometric tools for landmark
<br />data. Cambridge Univ. Press, Cambridge.
<br />-. 1994. Can biometrical shape be a homolo-
<br />gous character? p. 198-229. In: Homology: the hi-
<br />
<br />erarchical basis of comparative biology. B. K. Hall
<br />(ed.). Academic Press, New York.
<br />_. 1996. Combining the tools of geometricmor-
<br />phometrics, p. 131-151. In: Advances in morpho-
<br />metrics. NATO ASI Series A, Life Sciences Vol. 284.
<br />L. F. Marcus, M. Corti, A. Loy, G.]. P. Naylor, and
<br />D. E. Slice (eds.). Plenum Press, New York.
<br />_, B. CHERNOFF, R L. ELDER,]. M. HUMPHRIES
<br />JR., G. R. SMITH, AND R. E. STRAUSS. 1985. Mor-
<br />phometries in evolutionary biology. The geometry
<br />of size and shape change, with examples from fish-
<br />es. Natl. Acad. Sci. Phi/a. Spec. Publ. 15:1-277.
<br />CARPENTER, K. E. 1996. Morphometric patterns and
<br />feeding in emperor fishes (Lethrinidae, Percifor-
<br />mes), p. 479-487. In: Advances in morphometrics.
<br />NATO ASl Series A, Life Sciences Vol. 284. L. F.
<br />Marcus, M. Corti, A. Loy, G.]. P. Naylor, and D. E.
<br />Slice (ed.). Plenum Press, New York.
<br />CHEVERUD,]. M., AND]. T. RICHTSMEIER. 1986. Finite-
<br />element scaling applied to sexual dimorphism in
<br />rhesus macaque (Macaca mulatta) facial growth.
<br />Syst. Zool. 35:381-399.
<br />DEMAlws, B. D., T. E. DOWLINC, M. E. DOUGLAS, W.
<br />L. MINCKLEY, AND P. C. MARSH. 1992. Origin of Gila
<br />seminuda (Teleostei: Cyprinidae) through introgres-
<br />sive hybridization: Implications for evolution and
<br />conservation. Proc. Natl. Acad. Sci. USA 89:2747-
<br />2751.
<br />DOUGLAS, M. E. 1993. An analysis of sexual dimor-
<br />phism in an endangered cyprinid fish (Gila CYPha
<br />Miller) using video image technology. Copeia 1993:
<br />334-343.
<br />-, AND J. A. ENDLER. 1982. .Quantitative matrix
<br />comparisons in ecological and evolutionary studies.
<br />]. Theoret. BioI. 99:777-795.
<br />_, W. L. MINCKLEY, AND H. M. TYlJs. 1989. Qual-
<br />itative characters, identification of Colorado River
<br />chubs (Cyprinidae: Genus Gila) and the "art of see-
<br />ing well." Copeia 1989:653-662.
<br />_, R. R. MILLER, AND W. L. MINCKLEY. 1998.
<br />Multivariate discrimination of Colorado plateau
<br />Gila spp.: the "art of seeing well" revisited. Trans.
<br />Am. Fish. Soc. 127:163-173.
<br />DOUGLAS, M. R., AND P. C. BRUNNER. 2001. Two hun-
<br />dred years of human-induced management and its
<br />impacts on biodiversity of endemic Central Alpine
<br />Coregonus (Salmoniformes). Ecol. Applic.: in press.
<br />_, AND M. E. DOUGLAS. 2000. Late season re-
<br />production by big-river Catostomidae in Grand
<br />Canyon (Arizona). Copeia 2000:238-244.
<br />DOWLING, T. E., AND B. D. DEMAlws. 1993. Evolu-
<br />tionary significance of introgressive hybridization
<br />in cyprinid fishes. Nature 362:444-446.
<br />HOLDEN, P. B. 1968. Systematic studies of the genus
<br />Gila (Cyprinidae) of the Colorado River basin. Un-
<br />publ. master's thesis, Utah State Univ., Logan.
<br />_. 1991. Ghosts of the Green River: impacts of
<br />Green River poisoning on management of native
<br />fishes, p. 43-54. In: Battle against extinction: native
<br />fish management in the American west. W. L.
<br />Minckley and]. E. Deacon (eds.). Univ. of Arizona
<br />Press, Tucson.
<br />_, AND C. B. STALNAKER. 1975. Distribution and
<br />abundance of mainstream fishes of the middle and
<br />
<br />
<br />
<br />
<br />
<br />
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