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| 02388cam 2200349za 4500 |
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| 001 | 9.850201 |
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| 003 | CaOODSP |
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| 005 | 20221107154113 |
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| 007 | cr ||||||||||| |
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| 008 | 180117s1988 oncd||||o f000 0 eng d |
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| 040 | |aCaOODSP|beng |
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| 043 | |an-cn--- |
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| 086 | 1 |aCW69-9/172E-PDF |
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| 100 | 1 |aGaston, A. J. |
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| 245 | 14|aThe use of knock-down tags to detect changes in occupancy among burrow-nesting seabirds |h[electronic resource] : |bwhat is an adequate sample size? / |cby A.J. Gaston and B.T. Collins. |
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| 260 | |a[Ottawa] : |bCanadian Wildlife Service, |c1988. |
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| 300 | |a4 p. : |bcharts |
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| 490 | 1 |aProgress notes ; |vno. 172 |
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| 500 | |a"January 1988." |
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| 500 | |aDigitized edition from print [produced by Environment and Climate Change Canada]. |
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| 500 | |aIssued also in French under title: Utilisation de marqueurs de présence pour déterminer les variations du taux d'occupation de colonies d'oiseaux de mer nichant dans des terriers : calcul de la taille appropriée de l'échantillon. |
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| 504 | |aIncludes bibliographical references. |
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| 520 | |a"A major problem in taking a census of burrow-nesting seabirds is to decide what proportion of burrows is actually occupied. Where burrows are long, it may be necessary to dig one or more access tunnels to find the nest chamber and determine whether it is occupiect by a bird, egg or chick. The disturbance thus created may cause birds to desert and may alter the structure of the breeding habitat. In either case this affects the chances of future occupation. If the census is being conducted to detect population trends, such disturbances will reduce the validity of subsequent observations. Hence, there is a definite need for a method of determining burrow occupancy with minimum disturbance"--Introd. |
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| 692 | 07|2gccst|aAquatic birds |
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| 692 | 07|2gccst|aPopulation |
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| 700 | 1 |aCollins, B. T., |d1949- |
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| 710 | 1 |aCanada. |bEnvironment Canada. |
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| 710 | 2 |aCanadian Wildlife Service. |
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| 775 | 08|tUtilisation de marqueurs de présence pour déterminer les variations du taux d’occupation de colonies d’oiseaux de mer nichant dans des terriers |w(CaOODSP)9.860830 |
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| 830 | #0|aProgress notes (Canadian Wildlife Service)|vno. 172|w(CaOODSP)9.504439 |
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| 856 | 40|qPDF|s251 KB|uhttps://publications.gc.ca/collections/collection_2018/eccc/CW69-9-172-eng.pdf |
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