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拮抗性的共同演化关系在红收获蚁（''Pogonomyrmex barbatus''）和罗纹须蚁（''Pogonomyrmex rugosus''）之间可以看到，它们之间既有寄生关系也有互惠关系。蚁后无法通过与同类交配来繁殖工蚁。只有通过杂交，它们才能繁殖工蚁。有翅膀的雌性对其他物种的雄性像寄生一样，因为它们的精子只会繁殖不育的杂种。但由于殖民完全依赖于这些杂交种的生存，这也是互惠互利的。虽然两个物种之间没有基因交换，但它们不能朝向基因差异太大的方向演化，因为这将使杂交繁殖变得不可能。<ref name="Herrmann Cahan pp. 20141771–20141771">{{cite journal |last1=Herrmann |first1=M. |last2=Cahan |first2=S. H. |title=Inter-genomic sexual conflict drives antagonistic coevolution in harvester ants |journal=Proceedings of the Royal Society B: Biological Sciences |volume=281 |issue=1797 |date=29 October 2014 |doi=10.1098/rspb.2014.1771 |pmid=25355474 |pages=20141771 |pmc=4240986}}</ref>

拮抗性的共同演化关系在红收获蚁（''Pogonomyrmex barbatus''）和罗纹须蚁（''Pogonomyrmex rugosus''）之间可以看到，它们之间既有寄生关系也有互惠关系。蚁后无法通过与同类交配来繁殖工蚁。只有通过杂交，它们才能繁殖工蚁。有翅膀的雌性对其他物种的雄性像寄生一样，因为它们的精子只会繁殖不育的杂种。但由于殖民完全依赖于这些杂交种的生存，这也是互惠互利的。虽然两个物种之间没有基因交换，但它们不能朝向基因差异太大的方向演化，因为这将使杂交繁殖变得不可能。<ref name="Herrmann Cahan pp. 20141771–20141771">{{cite journal |last1=Herrmann |first1=M. |last2=Cahan |first2=S. H. |title=Inter-genomic sexual conflict drives antagonistic coevolution in harvester ants |journal=Proceedings of the Royal Society B: Biological Sciences |volume=281 |issue=1797 |date=29 October 2014 |doi=10.1098/rspb.2014.1771 |pmid=25355474 |pages=20141771 |pmc=4240986}}</ref>

==Predators and prey==

==捕食者和猎物==

[[File:Leopard kill - KNP - 001.jpg|thumb|left|Predator and prey: a [[leopard]] killing a [[bushbuck]]|链接=Special:FilePath/Leopard_kill_-_KNP_-_001.jpg]]

[[File:Leopard kill - KNP - 001.jpg|thumb|left|Predator and prey: a [[leopard]] killing a [[bushbuck]]|链接=Special:FilePath/Leopard_kill_-_KNP_-_001.jpg]]

{{Main|Predation}}

{{Main|Predation}}

Predators and prey interact and coevolve: the predator to catch the prey more effectively, the prey to escape. The coevolution of the two mutually imposes selective pressures. These often lead to an evolutionary arms race between prey and predator, resulting in anti-predator adaptations.

Predators and prey interact and coevolve: the predator to catch the prey more effectively, the prey to escape. The coevolution of the two mutually imposes selective pressures. These often lead to an evolutionary arms race between prey and predator, resulting in anti-predator adaptations.

The same applies to [[herbivore]]s, animals that eat plants, and the plants that they eat.  [[Paul R. Ehrlich]] and [[Peter H. Raven]] in 1964 proposed the theory of [[escape and radiate coevolution]] to describe the evolutionary diversification of plants and butterflies.<ref>{{cite journal |last1=Ehrlich |first1=Paul R. |author1-link=Paul R. Ehrlich |last2=Raven |first2=Peter H. |author2-link= Peter H. Raven |year=1964 |title=Butterflies and Plants: A Study in Coevolution |journal=Evolution |volume=18 |issue=4 |pages=586–608 |doi=10.2307/2406212 |jstor=2406212}}</ref> In the [[Rocky Mountains]], [[red squirrel]]s and [[crossbill]]s (seed-eating birds) compete for seeds of the [[lodgepole pine]]. The squirrels get at pine seeds by gnawing through the cone scales, whereas the crossbills get at the seeds by extracting them with their unusual crossed mandibles. In areas where there are squirrels, the lodgepole's cones are heavier, and have fewer seeds and thinner scales, making it more difficult for squirrels to get at the seeds. Conversely, where there are crossbills but no squirrels, the cones are lighter in construction, but have thicker scales, making it more difficult for crossbills to get at the seeds. The lodgepole's cones are in an evolutionary arms race with the two kinds of herbivore.<ref name="Berkeley">{{cite web |title=Coevolution |url=https://evolution.berkeley.edu/evolibrary/article/evo_33 |publisher=University of California Berkeley |access-date=17 January 2017}} and the two following pages of the web article.</ref>

The same applies to [[herbivore]]s, animals that eat plants, and the plants that they eat.  [[Paul R. Ehrlich]] and [[Peter H. Raven]] in 1964 proposed the theory of [[escape and radiate coevolution]] to describe the evolutionary diversification of plants and butterflies.<ref>{{cite journal |last1=Ehrlich |first1=Paul R. |author1-link=Paul R. Ehrlich |last2=Raven |first2=Peter H. |author2-link= Peter H. Raven |year=1964 |title=Butterflies and Plants: A Study in Coevolution |journal=Evolution |volume=18 |issue=4 |pages=586–608 |doi=10.2307/2406212 |jstor=2406212}}</ref> In the [[Rocky Mountains]], [[red squirrel]]s and [[crossbill]]s (seed-eating birds) compete for seeds of the [[lodgepole pine]]. The squirrels get at pine seeds by gnawing through the cone scales, whereas the crossbills get at the seeds by extracting them with their unusual crossed mandibles. In areas where there are squirrels, the lodgepole's cones are heavier, and have fewer seeds and thinner scales, making it more difficult for squirrels to get at the seeds. Conversely, where there are crossbills but no squirrels, the cones are lighter in construction, but have thicker scales, making it more difficult for crossbills to get at the seeds. The lodgepole's cones are in an evolutionary arms race with the two kinds of herbivore.<ref name="Berkeley">{{cite web |title=Coevolution |url=https://evolution.berkeley.edu/evolibrary/article/evo_33 |publisher=University of California Berkeley |access-date=17 January 2017}} and the two following pages of the web article.</ref>

The same applies to herbivores, animals that eat plants, and the plants that they eat.  Paul R. Ehrlich and Peter H. Raven in 1964 proposed the theory of escape and radiate coevolution to describe the evolutionary diversification of plants and butterflies. In the Rocky Mountains, red squirrels and crossbills (seed-eating birds) compete for seeds of the lodgepole pine. The squirrels get at pine seeds by gnawing through the cone scales, whereas the crossbills get at the seeds by extracting them with their unusual crossed mandibles. In areas where there are squirrels, the lodgepole's cones are heavier, and have fewer seeds and thinner scales, making it more difficult for squirrels to get at the seeds. Conversely, where there are crossbills but no squirrels, the cones are lighter in construction, but have thicker scales, making it more difficult for crossbills to get at the seeds. The lodgepole's cones are in an evolutionary arms race with the two kinds of herbivore. and the two following pages of the web article.

The same applies to herbivores, animals that eat plants, and the plants that they eat.  Paul R. Ehrlich and Peter H. Raven in 1964 proposed the theory of escape and radiate coevolution to describe the evolutionary diversification of plants and butterflies. In the Rocky Mountains, red squirrels and crossbills (seed-eating birds) compete for seeds of the lodgepole pine. The squirrels get at pine seeds by gnawing through the cone scales, whereas the crossbills get at the seeds by extracting them with their unusual crossed mandibles. In areas where there are squirrels, the lodgepole's cones are heavier, and have fewer seeds and thinner scales, making it more difficult for squirrels to get at the seeds. Conversely, where there are crossbills but no squirrels, the cones are lighter in construction, but have thicker scales, making it more difficult for crossbills to get at the seeds. The lodgepole's cones are in an evolutionary arms race with the two kinds of herbivore. and the two following pages of the web article.

这同样适用于食草动物，吃植物的动物，以及它们吃的植物。1964年，Paul r. Ehrlich 和 Peter h. Raven 提出了逃逸辐射共同进化理论来描述植物和蝴蝶的进化多样性。在落基山脉，红松鼠和斑鸠(食种子的鸟)争夺海滩松的种子。松鼠通过啃咬松果鳞片来获取松子，而交喙则通过它们不寻常的交叉下颚来获取松子。在有松鼠的地方，海滩鱼的球果更重，种子更少，鳞片更薄，这使得松鼠更难获得种子。相反，如果有交喙，但没有松鼠，球果的结构较轻，但有较厚的鳞片，使交喙更难以获得种子。海滩上的锥形细胞与这两种食草动物进行着一场进化中的军备竞赛。以及接下来两页的网络文章。

这同样适用于草食动物、植食动物，以及它们吃的植物。1964年，保罗·R·欧里希和彼得R·瑞文提出了逃逸辐射共同进化理论来描述植物和蝴蝶的进化多样性。在落基山脉，红松鼠和斑鸠(食种子的鸟)争夺海滩松的种子。松鼠通过啃咬松果鳞片来获取松子，而交喙则通过它们不寻常的交叉下颚来获取松子。在有松鼠的地方，海滩鱼的球果更重，种子更少，鳞片更薄，这使得松鼠更难获得种子。相反，如果有交喙，但没有松鼠，球果的结构较轻，但有较厚的鳞片，使交喙更难以获得种子。海滩上的锥形细胞与这两种食草动物进行着一场进化中的军备竞赛。以及接下来两页的网络文章。

[[File:Drosophila.melanogaster.couple.2.jpg|thumb|upright|[[Sexual conflict]] has been studied in ''[[Drosophila melanogaster]]'' (shown mating, male on right).|链接=Special:FilePath/Drosophila.melanogaster.couple.2.jpg]]

[[File:Drosophila.melanogaster.couple.2.jpg|thumb|upright|[[Sexual conflict]] has been studied in ''[[Drosophila melanogaster]]'' (shown mating, male on right).|链接=Special:FilePath/Drosophila.melanogaster.couple.2.jpg]]