Age and Area
Age and Area
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年龄和地区
DOI:
10.1086/394259
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发表时间:
1926
期刊:
影响因子:
--
通讯作者:
J. Willis
中科院分区:
文献类型:
--
作者:
J. Willis
[THE QUARTERLY REVIEW oi BIOLOGY has no intention of boring its readers with polemics. But the attack on the Age and Area hypothesis in an earlier number presented such an extremely one-sided view of the matter that it seemed desirable to restore the balance. Accordingly we have asked the distinguished originator of the theory of Age and Area, Dr. J. C. Willis, to prepare the following article. We now intend to give our readers ample time fully to digest and assimilate this two-course meal before offering them any more pabulum flavored with Age and Area.-THE EDITOR.1 A BOUT four years ago, under the above title (from the principal thesis therein brought forward) I published a book which has aroused some controversy and much criticism. Whether my views be accepted or not, they have reawakened interest in the fascinating study of geographical distribution, which for a long time has been in undue abeyance, and much new and valuable work has been brought out. My principal thesis, "Age and Area," is based upon statistics, whose introduction into biological work is sometimes resented, though one is becoming used to their employment in Mendelism, in agricultural research, etc. Many years ago, Hooker published a statement o the effect (I4, vol. i, p. 438) that "All seem to resent the making botanical geography too exact a science; they find it far easier to speculate than to employ the inductive process. The first step to tracing the progress of the creation of vegetation is to know the proportions in which the groups appear in different localities, a relation which must be expressed in numbers to be at all tangible." My work has consisted largely in following up this suggestion, and in showing in what manner the careful use of statistical methods can be applied to aid the various ways-morphological, ecological, and other-already in use for the investigation of the complex problems of botanical geography. My statistics, which might otherwise have been dismissed as those of an amateur, have received great support from the fact that they have been taken up by the well known statistician Mr. Udny Yule, who has based upon them an important paper (33). As I have pointed out in the first sentence of my book, "The existing distribution of a plant (or animal) upon the surface of the globe, which is often a very complex phenomenon, is due to the interaction of very many factors;" and at the end of the same paragraph I have said, "To all this it is obvious that age must be addedthe older a species is, the more area will it have had time to cover." People have often taken up Age and Area alone, as if it, without assistance from other branches of knowledge, were expected to provide a master-key that had only to be turned in the lock to open a main avenue to the solution of the problems of geographical distribution. These problems are among the most complex and puzzling of all that arise in biology, and without the application of all the various criteria that are available -morphological, cytological, ecological,