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| 01900cam 2200373za 4500 |
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| 001 | 9.855895 |
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| 003 | CaOODSP |
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| 005 | 20221107155418 |
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| 007 | cr ||||||||||| |
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| 008 | 180427s1986 onca|||#o f00| 0 eng d |
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| 040 | |aCaOODSP|beng |
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| 043 | |an-cn-on |
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| 086 | 1 |aCW69-1/57E-PDF |
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| 100 | 1 |aBlokpoel, H., |d1938- |
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| 245 | 14|aThe ring-billed gull in Ontario |h[electronic resource] : |ba review of a new problem species / |cH. Blokpoel, G.D. Tessier. |
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| 260 | |a[Ottawa] : |bCanadian Wildlife Service, |c1986. |
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| 300 | |a34 p. : |bill. |
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| 490 | 1 |aOccasional paper ; |vno. 57 |
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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: Le goéland à bec cerclé en Ontario : une nouvelle espèce problème. |
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| 500 | |aErrata sheet inside front cover. |
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| 504 | |aIncludes bibliographical references. |
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| 520 | 3 |a"During the period 1976-84 the nesting population of the Ring-billed Gull (Larus delawarensis) in the Great Lakes and Upper St. Lawrence River increased at an average annual growth rate of 11%. In 1984 there were an estimated 700 000 pairs of Ring-bills in that area (about two-thirds in Canada and one-third in the USA). Because Ring-bills are highly adaptable it is likely that their numbers will continue to increase"--Abstract. |
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| 692 | 07|2gccst|aBirds |
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| 692 | 07|2gccst|aPopulation |
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| 692 | 07|2gccst|aEnvironmental impact |
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| 693 | 4|aRing-billed gull |
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| 700 | 1 |aTessier, G. D. |
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| 710 | 1 |aCanada. |bEnvironment Canada. |
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| 710 | 2 |aCanadian Wildlife Service. |
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| 775 | 08|tLe goéland à bec cerclé en Ontario |w(CaOODSP)9.856578 |
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| 830 | #0|aOccasional paper (Canadian Wildlife Service)|vno. 57|w(CaOODSP)9.504780 |
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| 856 | 40|qPDF|s12.62 MB|uhttps://publications.gc.ca/collections/collection_2018/eccc/CW69-1-57-eng.pdf |
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