00000cam 2200000za 4500 9.855901 CaOODSP 20241203113642 cr ||||||||||| 180427s1987 onca|||#o f00| 0 eng d CaOODSP eng n-cn--- CW69-1/59E-PDF Gaston, A. J. Estimating densities of birds at sea and the proportion in flight from counts made on transects of indefinite width [electronic resource] / A.J. Gaston, B.T. Collins, A.W. Diamond. [Ottawa] : Canadian Wildlife Service, c1987. 16 p. : ill. Occasional paper ; no. 59 Digitized edition from print [produced by Environment and Climate Change Canada]. Issued also in French under title: Estimation de la densité des oiseaux en mer et de la proportion des oiseaux en vol à partir des dénombrements effectués sur des transects de largeur indéterminée. Includes bibliographical references. "Counts of seabirds at sea are sometimes made without defining an outer transect width or measuring the distance to each sighting. These counts can be converted into indices of abundance by expressing them as birds per unit time or per distance travelled. If the relative motion of flying birds is taken into account, then the comparability of such indices can be improved. In addition, the relative density of birds in flight and on the water can be estimated. We present methods for doing this, based on knowledge of flight speeds and range of detectability"--Abstract. gccst Aquatic birds gccst Population Collins, B. T., 1949- Diamond, A. W., 1944- Canada. Environment Canada. Canadian Wildlife Service. Estimation de la densité des oiseaux en mer et de la proportion des oiseaux en vol à partir des dénombrements effectués sur des transects de largeur indéterminée (CaOODSP)9.856594 Occasional paper (Canadian Wildlife Service) no. 59 (CaOODSP)9.504780 PDF 2.54 MB https://publications.gc.ca/collections/collection_2018/eccc/CW69-1-59-eng.pdf