Demography and movements of the Omao (Myadestes obscurus)Entry ID: brdpier0007
Abstract: Density, age-specific survival, timing of breeding and molting, and
movements of the Omao or Hawaiian Thrush (Myadestes obscurus) were studied at
four sites on the island of Hawaii. Mean monthly density (birds/ha) was 3.23
+/- 0.57, 1.07 +/- 0.33, 3.23 +/- 0.16, and 3.74 +/- 0.36 at Kau Forest,
Hamakua, Keauhou Ranch, and Kilauea Forest study areas, respectively. Annual
survival of juvenile Omao ... (.40 +/- 0.09) was lower than that of adults (0.66
+/- 0.08). Emigration and mortality was greatest during November through May.
Breeding and molting occurred throughout the year, with peak breeding in May
through July. Omao showed strong site fidelity and were highly sedentary.
Mean home range size (n = 39) was 2.20 +/1 0.26 ha did not differ between sexes
or study sites.
Four sites on the island of Hawaii between November 1976 and January 1982:
Keauhou Ranch (19.50, -155.33 1800 m elevation), Kilauea Forest (19.52, -155.32
; 1,600-1,650 m), Hamakua (19.78, -155.33; 1770 m) and Kau Forest (19.22,
155.65, 1750 m), as described in Ralph and Fancy (1994). 1.5.2 Bounding
Estimated density of Omao at each of the four study areas by the variable
circular-plot method Ramsey and Scott 1979, Reynolds et al. 1980). during 8-min
Purpose: To study the demography and movements of the Omao (Myadestes Obscurus).
Data Set Citation
Dataset Originator/Creator: C.John Ralph and Steven G. Fancy
Dataset Title: Demography and movements of the Omao (Myadestes obscurus).
Dataset Release Date: 1994
Dataset Release Place: Hawaii National Park, HI
Dataset Publisher: National Biological Survey, Hawaii Field StationOnline Resource: http://www.treesearch.fs.fed.us/pubs/3634
Start Date: 1976-11-01Stop Date: 1982-01-31
BIOSPHERE > ECOSYSTEMS > TERRESTRIAL ECOSYSTEMS > FORESTS
BIOSPHERE > ECOSYSTEMS > TERRESTRIAL ECOSYSTEMS > ISLANDS
BIOLOGICAL CLASSIFICATION > ANIMALS/VERTEBRATES > BIRDS
BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > MIGRATORY RATES/ROUTES
BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > POPULATION DYNAMICS
BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > SURVIVAL RATES
ISO Topic Category
Access Constraints none
Use Constraints none
Data Set Progress
Role: TECHNICAL CONTACT
Phone: (970) 225-3571
Email: steve_fancy at nps.gov
National Park Service Natural Resource Information Division 1201 Oak Ridge Drive, Suite 150
City: Fort Collins
Province or State: CO
Postal Code: 80525-5589
C. John Ralph. 1994. Demography and movements of the Omao, The Condor, 96.
Ramsey, F.L., and J.M. Scott. 1979. Estimating population densities from
variable circular plot surveys. In R. Cormack, G. Patil, and D. Robson [eds.], Sampling biological populations,
C. John Ralph and Steven G. Fancy. 1994. Timing of breeding and molting in six species of Hawaiian honeycreepers, Condor, 96, pp. 151-161.
Ralph, C.J., G.R. Geupel, P. Pyle, T.E. Martin, and D.F. DeSante. 1993. Manual of field methods for monitoring land birds. General Technical Report PSW-GTR, U.S. Forest Service, Albany, CA, pp. 165-174.
Pyle, P., S.N.G. Howell, R.P. Yunick, and D.F. DeSante. 1987. Identification guide to North American paasserines, Slate Creek Press, Bolinas, California, 278 p.
Pollock, K.H., J.D. Nichols, C.Brownie,, and J. E. Hines. 1990. Statistical
inference for capture-recapture experiments, Wildl. Monogr. 107, pp. 1-97.
Mohr, C.O. 1947. Table of equivalent populations of North American small
mammals, Am. Midl. nat., 37, p. 223-249.
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Creation and Review Dates
Last DIF Revision Date: 2017-08-23