. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 366 I. Rowley Bonn, zool. Beitr. breeding is quite commonplace (e. g. Lemurs, Jolly 1966) and does not appear to result in decadent species. In agricultural circles, inbreeding has been practised for centuries by animal husbandrymen; studies of human genetics have shown not only that inbreeding is quite common in certain tribes and castes, but that the participating individuals need not show reduced fertility or any other deleterious effects (Darlington 1953). If th
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 366 I. Rowley Bonn, zool. Beitr. breeding is quite commonplace (e. g. Lemurs, Jolly 1966) and does not appear to result in decadent species. In agricultural circles, inbreeding has been practised for centuries by animal husbandrymen; studies of human genetics have shown not only that inbreeding is quite common in certain tribes and castes, but that the participating individuals need not show reduced fertility or any other deleterious effects (Darlington 1953). If the avoidance of inbreeding is not so important as previously thought, then the shedding of independent young from the family group should no longer be regarded as a process automatically selected for in the course of evolution, as has been frequently stated or inferred in the past. It is not the purpose of this paper to suggest that communal living among Australian species of birds is an adaption to an irregular climate, although it well may be. Rather I suggest that the shedding of the annual crop of young by the parent birds presents certain problems and is by no means so urgent where the winter (or non-breeding season) is not so rigorous as that in the Northern Fig. 2.—A roosting cluster of Dusky Woodswallows. Photograph by M. S. R. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Zoologisches Forschungsinstitut und Museum Alexander Koenig. Bonn : Das Forschungsinstitut
Size: 1445px × 1730px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcoll, booksubjectbiology, booksubjectzoology
