 | Thomas George Gentry - 1900 - Страниц: 532
...altogether independent of the Struggle for Existence ; but in so far as it chiefly acts in the reduction of food, it brings on the most severe struggle between the individuals, whether of the same or different species, which subsist on the same kind of fare. Even when climate, extreme cold for example,... | |
 | 1903 - Страниц: 936
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 | Dennis Hird - 1903 - Страниц: 256
...when we remember that ten per cent, is an extraordinarily severe mortality from epidemics with men. The action of climate seems at first sight to be quite...struggle between the individuals, whether of the same or distinct species, which subsist on the same kind of food " (P- 54). When a species, owing to highly... | |
 | Thomas Hunt Morgan - 1903 - Страниц: 498
...species, and periodical seasons of extreme cold or drought seem to be the most effective of all checks." "The action of climate seems at first sight to be...struggle for existence ; but in so far as climate acts in reducing food, it brings on the most severe struggle between the individuals, whether of the... | |
 | Charles Darwin - 1909 - Страниц: 584
...estimated ( chiefly Trom~ tHe greatly reduced numbers of nests in the spring) that the winter of 1854-5 destroyed fourfifths of the birds in my own grounds...cold, acts directly, it will be the least vigorous individuals, or those which have got least food through the advancing winter, which will suffer most.... | |
 | Rudolph Wilson Chamberlain, Joseph Sheldon Gerry Bolton - 1923 - Страниц: 392
...effective of all checks. I estimated (chiefly from the greatly reduced numbers of nests in the spring) that the winter of 1854-55 destroyed four-fifths of...cold, acts directly, it will be the least vigorous individuals, or those which have got least food through the advancing winter, which will suffer most.... | |
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The action of climate seems at first sight to be quite independent of the struggle for existence ; but in so far as climate chiefly acts in reducing food, it brings on the most severe struggle between the individuals, whether of the same or of distinct... 
