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Showing The Origin of Species Illustrated (The Illustrated Origin of Species) where title like '%Struggle for life most severe%' order by subject, title, ordinal (2 Rows).

subject

title

description

03 - Struggle for Existence

03-10 - Struggle for Life most severe between Individuals and Varieties of the same Species

As the species of the same genus usually have, though by no means invariably, much similarity in habits and constitution, and always in structure, the struggle will generally be more severe between them, if they come into competition with each other, than between the species of distinct genera.

We see this in the recent extension over parts of the United States of one species of swallow having caused the decrease of another species.

United States

swallow

The recent increase of the missel-thrush in parts of Scotland has caused the decrease of the song-thrush.

Scotland

Missel Thrush

Song Thrush

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03 - Struggle for Existence

03-10 - Struggle for Life most severe between Individuals and Varieties of the same Species

How frequently we hear of one species of rat taking the place of another species under the most different climates!

In Russia the small Asiatic cockroach has everywhere driven before it its great congener.

rat

Russia

cockroach

In Australia the imported hive-bee is rapidly exterminating the small, stingless native bee. One species of charlock has been known to supplant another species; and so in other cases.

Australia

Hive Bee

charlock

We can dimly see why the competition should be most severe between allied forms, which fill nearly the same place in the economy of nature; but probably in no one case could we precisely say why one species has been victorious over another in the great battle of life.

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Statistics and Drill Down Data Mining

subject	#
01 - Variations Under Domestication	53	53
02 - Variations Under Nature	23	76
03 - Struggle for Existence	30	106
04 - Natural Selection	105	211
05 - Laws of Variation	48	259
06 - Difficutiles in Theory	74	333
07 - Instinct	13	346
08 - Hybridism	9	355
09 - On the Imperfection of the Geological Record	7	362
10 - On The Geological Succession of Organic Beings	10	372
11 - Geographical Distribution	7	379
12 - Geographical Distribution -- continued	23	402
13 - Mutual Affinities of Organic Beings: Morphology: Embryology: Rudimentary Or	34	436
14 - Recapitulation and Conclusion	38	474

title	#
01-01 - Causes of Variability	5	5
01-02 - Effects of Habit	1	6
01-03 - correlation of Growth	2	8
01-04 - Inheritance	4	12
01-05 -Character of Domestic Varieties	2	14
01-06 - Difficulty of distinguishing between Varieties and Species	2	16
01-07 - Origin of Domestic Varieties from one or more Species	7	23
01-08 - Breeds of the Domestic Pigeons, their Differences and Origin	9	32
01-09 - Principles of Selection anciently followed, and their Effects	6	38
01-10 - Methodical and Unconscious Selection	5	43
01-11 - Unknown Origin of our Domestic Productions	5	48
01-12 - Circumstances favourable to Man's Power of Selection	3	51
01-13 - Summary	2	53
02-01 - Variability	2	55
02-02 - Individual Differences	2	57
02-03 - Doubtful Species	10	67
02-04 - Wide-ranging, much diffused, and common Species vary most	3	70
02-05 - Species of the Larger Genera in each Country vary more frequently than the Species of the Smaller Genera	2	72
02-06 - Many of the Species included within the Larger Genera resemble Varieties in being very closely, but unequally, related to each other, and in having restricted ranges	2	74
02-07 - Summary	2	76
03-01 - Bears on Natural Selection	2	78
03-02 - The Term, Struggle for Existence, used in a large sense	2	80
03-03 - Geometrical Ratio of Increase	2	82
03-04 - Rapid Increase of naturalised Animals and Plants	3	85
03-05 - Nature of the Checks to Increase	2	87
03-06 - Competition Universal	2	89
03-07 - Effects of Climate	2	91
03-08 - Protection from the Number of Individuals	2	93
03-09 - Complex Relations of all Animals and Plants Throughout Nature	5	98
03-10 - Struggle for Life most severe between Individuals and Varieties of the same Species	2	100
03-11 - The Relation of Organism to Organism the Most Important of All Relations	4	104
03-12 - Summary	2	106
04-01 - Natural Selection	5	111
04-02 - Its Power Compared with Man's Selection	2	113
04-03 - Its Power on Characters of Trifling Importance	2	115
04-04 - Its Power at All Ages and on Both Sexes	2	117
04-05 - Sexual Selection	3	120
04-06 - On the generality of Intercross Between Individuals of the Same Species	9	129
04-07 - Illustrations of the Action of Natural Selection:	10	139
04-08 - On the Intercrossing of Individuals	8	147
04-09 - Circumstances favourable for the production of new forms through Natural Selection	12	159
04-10 - Extinction caused by Natural Selection	3	162
04-11 - Divergence of Character	26	188
04-12 - On the Degree to which Organisation tends to advance	11	199
04-13 - Convergence of Character	8	207
04-14 - Summary of Chapter	4	211
05-01 - Effects of External Conditions	2	213
05-02 - Use and Disuse of Parts, combined with Natural Selection, Organs of Flight and Vision	7	220
05-03 - Acclimatisation	4	224
05-04 - Correlation of Growth	5	229
05-05 - Compensation and Economy of Growth	2	231
05-06 - False Correlation	2	233
05-07 - Multiple, Rudimentary, and Lowly-organised Structures are Variable	2	235
05-08 - Parts Developed in an Unusual Manner are Highly Variable	5	240
05-09 - Specific Characters more Variable than Generic Characters	2	242
05-10 - Secondary Sexual Characters Variable	3	245
05-11 - Species of the Same Genus Vary in an Analogous Manner	2	247
05-12 - Reversion to Long Lost Characters	10	257
05-13 - Summary	2	259
06-01 - Difficulties on the Theory of Descent with Modification	5	264
06-02 - Transitions	2	266
06-03 - Absence or Rarity of Transitional Varieties	10	276
06-04 - Transitions in Habits of Life	7	283
06-05 - Diversified Habits in the Same Species	2	285
06-06 - Species with Habits Widely Diffferent from those of their Allies	3	288
06-07 - Organs of extreme Perfection	5	293
06-08 - Means of Transition	6	299
06-09 - Cases of Difficulty	5	304
06-10 - Natura Non Facit Saltum	2	306
06-11 - Organs of Small Importance	6	312
06-12 - Organs not in all Cases Absolutely Perfect	13	325
06-13 - Summary: The Law of Unity of Type and of the Conditions of Existence Embraced by the Theory of Natural Selection	8	333
07-01 - Instincts comparable with habits, but different in their origin	2	335
07-02 - Instincts Graduated	2	337
07-03 - Aphides and ants	1	338
07-04 - Instincts variable	1	339
07-05 - Domestic instincts, their origin	1	340
07-06 - Natural instincts of the cuckoo, ostrich, and parasitic bees	1	341
07-07 - Slave-making ants	1	342
07-08 - Hive-bee, its cell-making instinct	1	343
07-09 - Difficulties on the theory of the Natural Selection of instincts	1	344
07-10 - Neuter or sterile insects	1	345
07-11 - Summary	1	346
08-01 - Distinction between the sterility of first crosses and of hybrids	1	347
08-02 - Sterility various in degree, not universal, affected by close interbreeding, removed by domestication	1	348
08-03 - Laws governing the sterility of hybrids	1	349
08-04 - Sterility not a special endowment, but incidental on other differences	1	350
08-05 - Causes of the sterility of first crosses and of hybrids	1	351
08-06 - Parallelism between the effects of changed conditions of life and crossing	1	352
08-07 - Fertility of varieties when crossed and of their mongrel offspring not universal	1	353
08-08 - Hybrids and mongrels compared independently of their fertility	1	354
08-09 - Summary	1	355
09-01 -On the absence of intermediate varieties at the present day	1	356
09-02 - On the nature of extinct intermediate varieties; on their number	1	357
09-03 - On the vast lapse of time, as inferred from the rate of deposition and of denudation	1	358
09-04 - On the poorness of our palaeontological collections	1	359
09-05 - On the intermittence of geological formations	1	360
09-06 - On the absence of intermediate varieties in any one formation	1	361
09-07 - On their sudden appearance in the lowest known fossiliferous strata	1	362
10-01 - On the slow and successive appearance of new species	1	363
10-02 - On their different rates of change	1	364
10-03 - Species once lost do not reappear	1	365
10-04 - Groups of species follow the same general rules in their appearance and disappearance as do single species	1	366
10-05 - On Extinction	1	367
10-06 - On simultaneous changes in the forms of life throughout the world	1	368
10-07 - On the affinities of extinct species to each other and to living species	1	369
10-08 - On the state of development of ancient forms	1	370
10-09 - On the succession of the same types within the same areas	1	371
10-10 - Summary of preceding and present chapters	1	372
11-01 - Present distribution cannot be accounted for by differences in physical conditions	1	373
11-02 - Importance of barriers	1	374
11-03 - Affinity of the productions of the same continent	1	375
11-04 - Centres of creation	1	376
11-05 - Means of dispersal, by changes of climate and of the level of the land, and by occasional means	2	378
11-06 - Dispersal during the Glacial period co-extensive with the world	1	379
12-10 - Distribution of fresh-water productions	1	380
12-20 - On the inhabitants of oceanic islands	1	381
12-30 - Absence of Batrachians and of terrestrial Mammals	4	385
12-40 - On the relations of the inhabitants of islands to those of the nearest mainland	3	388
12-50 - On colonisation from the nearest source with subsequent modification	10	398
12-60 - Summary of the last and present chapters	4	402
13-01 - CLASSIFICATION, groups subordinate to groups	1	403
13-02 - Natural system	1	404
13-03 - Rules and difficulties in classification, explained on the theory of descent with modification	13	417
13-04 - Classification of varieties	1	418
13-05 - Descent always used in classification	6	424
13-06 - Analogical or adaptive characters	2	426
13-07 - Affinities, general, complex and radiating	2	428
13-08 - Extinction separates and defines groups	4	432
13-09 - MORPHOLOGY, between members of the same class, between parts of the same individual	1	433
13-10 - EMBRYOLOGY, laws of, explained by variations not supervening at an early age, and being inherited at a corresponding age	1	434
13-11 - RUDIMENTARY ORGANS; their origin explained	1	435
13-12 - Summary	1	436
14-01 - Recapitulation of the difficulties on the theory of Natural Selection	7	443
14-02 - Recapitulation of the general and special circumstances in its favour	10	453
14-03 - Causes of the general belief in the immutability of species	13	466
14-04 - How far the theory of natural selection may be extended	1	467
14-05 - Effects of its adoption on the study of Natural history	5	472
14-06 - Concluding remarks	2	474
wolfs	1	475

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