| Citation | Sydeman, W.J., J.F. Penniman, T.M. Penniman, P. Pyle and D.G. Ainley 1991 Breeding performance in the Western Gull: effects of parental age, timing of breeding and year in relation to food availability. Seabirds Journal of Animal Ecology 60:135-149. |
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| Ref. No. | 4461 |
| Language | English |
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