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267 |
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| Name |
Yellow Billed Magpie mating and reproduction
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| Description |
Yellow-billed magpies breed in loose colonies. Extrapair courtship is frequent, and a comparison (1) between two adjacent areas with different inter-nest distances, and (2) with solitary, territorial European black-billed magpies, indicates that either an aggregated distribution of nests, or a relatively loose territorial system in yellow-billed magpies increases opportunities for extrapair behavior. Male yellow-billed magpies guard their partner by closely following them from five days before the first egg is laid. Pair copulations were infrequent, occurring 3 or 4 times per clutch, and mainly over days -5 to -3. Territoriality, which is most pronounced during the female's fertile period, may enable the male to guard his partner while simultaneously foraging to provide her with food.marginally significant evidence of female mate preference based on body mass, wing length, wing loading index, or age; to the extent that any of these characters appeared to influence mating success, they similarly influenced refusal rates. The overall weakness of female mate choice is further suggested by the frequency of females ovipositing without prior matings and by the low frequency with which females remate with the same males. On a population basis, females strongly prefer to oviposit in the middle of the day and at particular parts of the study pond. Thus, females exhibit strong choice at several levels. However, despite the high incidence of active female rejection and high variance in male mating success, mate choice is apparently of minor importance in this population. Female discrimination of males, combined with variance in male mating success, are necessary but not sufficient for the action of sexual selection via mate choice. These findings support the prediction that male-male competition is of primary importance in resource control mating systems in which males are able to control female access to most or all favored oviposition sites. However, it is not clear why females generally fail to discriminate among males, given that they have the opportunity to do so. In general, females appear to have low motivation to mate with males, presumably because multiple mating does not significantly increase their fertility or fecundity. Selection for rapid mating may be significant, both because of predation on females during mating and oviposition and because of the risks for males of losing their territories during mating bouts. This time constraint may be the most important factor limiting female discrimination among males on the basis of consistent characteristics.
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| Physical Location |
Main body of data from 1983-1986 Approximately 300 blood samples in storage at Hastings form 1994-1999 in LongmireÍs (-20C).
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| Publisher/Owner |
Walt Koenig, Hastings Natural History Reserve, wicker@uclink4.berkeley.edu , 831 659-5981
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| Publication Date |
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| Permissions |
Undetermined
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| Source |
Mark Stromberg NRS file
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| Contact |
Walt Koenig
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| Type |
Biological Survey - Observational
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| Subject |
Animal
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| Geo. Extent |
Hastings Reserve
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| URL |
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| NRS Registry? |
yes
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| Format |
Database
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| Timespan Start |
1983
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| Timespan End |
2000
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| Total Items |
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| Databased Items |
(as of 2012-08-30)
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| Comments |
Koenig, W. D. and M. D. Reynolds (1987). "Potential poisoning of yellow-billed magpies by compound 1080. ." Wildl. Soc. Bull. 15: 274-276. PDF saved in Dropbox
Reynolds, M. D. (1990). The ecology of spacing behavior in the yellow-billed magpie (Pica nuttallii). Museum of Vertebrate Zoology. Berkeley, CA, University of California: 172.
Reynolds, M. D. (1995). Yellow-billed Magpie (Pica nuttalli). Birds of North America. A. Poole and F. Gill. Philadelphia, PA, Birds of North America. 180.
Reynolds, M. D. and W. D. Koenig (1997). "Reproductive success of Yellow-billed magpies Pica nuttalli in central coastal California." Acta Ornithologica 32(99-109). Print copy found in Biosciences Library QL671 .W34
Bolen, G. M., S. I. Rothstein, et al. (2000). "Egg recognition in Yellow-billed and Black-billed Magpies in the absence of interspecific parasitism: Implications for parasite-host coevolution." Condor 102(2): 432-438. PDF saved in Dropbox
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| Entered By |
Jessica Rothery
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| Last Updated |
2012-08-30 11:46:07
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