Bibliography and Index of the Sirenia and Desmostylia  

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"Summers, Robert C."

Summers, Robert C.: SEE Packard et al., 1983, 1985. (detail)
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 Packard, Jane M.; Summers, Robert C.; Barnes, Lindsay B. (detail)
   
1983
Correction factors for observability of manatees during aerial surveys.
Manatee Population Research Rept. (Gainesville, Fla., Florida Cooperative Fish & Wildlife Research Unit) No. 3: 1-10. 1 tab. 1 fig.
–Summ.: Packard, Summers & Barnes (1985). See also Appendix 1. Uses actual counts of manatees identified in Blue Spring, together with 7 radiotagged manatees and 3 tagged with vinyl flags, to obtain correction factors for aerial surveys of the St. Johns River, Florida. Only 33-57% of manatees known to be in the area were sighted from the air. Factors influencing variation in counts are discussed, including habitat type, survey conditions, and observer bias. Correction factors obtained for each survey gave estimates closer to total counts than factors based on the mean ratio-of-radios-sighted over all surveys.
x
 
 Packard, Jane M.; Summers, Robert C.; Barnes, Lindsay B. (detail)
   
1985
Variation of visibility bias during aerial surveys of manatees.
Jour. Wildl. Manage. 49(2): 347-351. 1 tab.
–A revised and abridged version of Packard, Summers & Barnes (1983), omitting discussion of the use of vinyl flags.
Daryl P. Domning, Research Associate, Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560, and Laboratory of Evolutionary Biology, Department of Anatomy, College of Medicine, Howard University, Washington, D.C. 20059.
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