Estimating densities of birds at sea and the proportion in flight from counts made on transects of indefinite width / A.J. Gaston, B.T. Collins, A.W. Diamond. : CW69-1/59E-PDF
"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.
Lien permanent pour cette publication :
publications.gc.ca/pub?id=9.855901&sl=1
| Ministère/Organisme | Canada. Environment Canada. Canadian Wildlife Service. |
|---|---|
| Titre | Estimating densities of birds at sea and the proportion in flight from counts made on transects of indefinite width / A.J. Gaston, B.T. Collins, A.W. Diamond. |
| Titre de la série | Occasional paper ; no. 59 |
| Type de publication | Série - Voir l'enregistrement principal |
| Langue | [Anglais] |
| Autres langues publiées | [Français] |
| Format | Électronique |
| Document électronique | |
| Note(s) | 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. |
| Information sur la publication | [Ottawa] : Canadian Wildlife Service, c1987. |
| Auteur / Contributeur | Gaston, A. J. Collins, B. T., 1949- Diamond, A. W.,1944- |
| Description | 16 p. : ill. |
| Numéro de catalogue |
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| Descripteurs | Aquatic birds Population |