Techniques for Shipboard Surveys of Marine Birds

Cover Techniques for Shipboard Surveys of Marine Birds
Techniques for Shipboard Surveys of Marine Birds
Patrick J Gould
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1). Such a flock should only be counted once (i. E. , in the first instant count) and then ignored in all future counts. Land birds and flocks of shorebirds that are obviously just passing over the area on migration or moving between two distant points are handled differently than marine birds. By using proper coding techniques (see Appen- dix B), these sightings can be included in the data base without influencing density indexes. Estimating numbers is a major source of bias in surveys. Before... going into the field, practice estimating large numbers of objects such as beans on a table or birds in pictures (Arbib 1972). Most field observers estimate the number of birds in large flocks by counting in 10's or 100' s. This requires the observer to maintain a firm mental SHIPBOARD SURVEYS OF MARINE BIRDS Table 2. Meters to the end of the transect per minute into transect. Speed made good (nmi/h) Minutes into transect OO 3 01 02 03 04 05 b 06 07 08 09 10 11 12 13 14 C 6. 0 2, 778 2, 593 2, 408 2, 222 2, 037 1, 852 1, 667 1, 482 1, 296, 111 926 741 556 370 185 7.

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