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Host–parasite coevolution is the coevolution of a host and a parasite. A general characteristic of many viruses, as obligate parasites, is that they coevolved alongside their respective hosts. Correlated mutations between the two species enter them into an evolution arms race. Whichever organism, host or parasite, that cannot keep up with the other will be eliminated from their habitat, as the species with the higher average population fitness survives. This race is known as the Red Queen hypothesis. cited in: The Red Queen Principle The Red Queen hypothesis predicts that sexual reproduction allows a host to stay just ahead of its parasite, similar to the Red Queen's race in Through the Looking-Glass: "it takes all the running you can do, to keep in the same place". The host reproduces sexually, producing some offspring with immunity over its parasite, which then evolves in response.

Host–parasite coevolution is the coevolution of a host and a parasite. A general characteristic of many viruses, as obligate parasites, is that they coevolved alongside their respective hosts. Correlated mutations between the two species enter them into an evolution arms race. Whichever organism, host or parasite, that cannot keep up with the other will be eliminated from their habitat, as the species with the higher average population fitness survives. This race is known as the Red Queen hypothesis. cited in: The Red Queen Principle The Red Queen hypothesis predicts that sexual reproduction allows a host to stay just ahead of its parasite, similar to the Red Queen's race in Through the Looking-Glass: "it takes all the running you can do, to keep in the same place". The host reproduces sexually, producing some offspring with immunity over its parasite, which then evolves in response.

宿主-寄生的共同演化是宿主和寄生者的共同演化。<ref name="Woolhouse">{{cite journal |doi=10.1038/ng1202-569 |last1=Woolhouse |first1=M. E. J. |last2=Webster |first2=J. P. |last3=Domingo |first3=E. |last4=Charlesworth|first4=B. |last5=Levin |first5=B. R. |title=Biological and biomedical implications of the coevolution of pathogens and their hosts |journal=[[Nature Genetics]] |date=December 2002 |pmid=12457190 |volume=32 |issue=4 |pages=569–77 |url=http://www.era.lib.ed.ac.uk/bitstream/1842/689/2/Charlesworth_Woolhouse.pdf|hdl=1842/689 |s2cid=33145462 |hdl-access=free }}</ref>许多病毒作为专性寄生者的一个普遍特征是它们与各自宿主的共同演化。这两个物种之间的相关突变使它们进入了进化的军备竞赛。无论是哪种生物、宿主或寄生物，如果不能跟上其他生物的步伐，它们就会从它们的栖息地消失，而平均适合度较高的物种会幸存下来。这种竞争的假说被称为红皇后假说。<ref>{{cite journal |author=Van Valen, L. |date=1973 |title=A New Evolutionary Law |journal=Evolutionary Theory |volume=1 |pages=1–30}} cited in: [http://pespmc1.vub.ac.be/REDQUEEN.html The Red Queen Principle]</ref>红皇后假说预测有性生殖可以让寄主在寄生者之前保持领先，就像''爱丽丝镜中奇遇''的红皇后比赛一样：“尽你所能跑而仍保持在同一个地方。”。<ref>{{cite book |last=Carroll |first=Lewis |author-link=Lewis Carroll |orig-year=1871 |title=Through the Looking-glass: And what Alice Found There |url=https://books.google.com/books?id=cJJZAAAAYAAJ |publisher=Macmillan |date=1875 |page=42 |quote=it takes all the running ''you'' can do, to keep in the same place.}}</ref>宿主进行有性繁殖，产生一些对寄生物具有免疫力的后代，然后进化为应对措施。<ref>{{cite journal |doi=10.1038/srep10004 |last=Rabajante |first=J. |display-authors=etal |title=Red Queen dynamics in multi-host and multi-parasite interaction system |journal=[[Scientific Reports]] |year=2015 |volume=5 |pages=10004 |pmid=25899168 |pmc=4405699|bibcode=2015NatSR...510004R}}</ref>

宿主和寄生者的共同演化是宿主和寄生者的共同演化。<ref name="Woolhouse">{{cite journal |doi=10.1038/ng1202-569 |last1=Woolhouse |first1=M. E. J. |last2=Webster |first2=J. P. |last3=Domingo |first3=E. |last4=Charlesworth|first4=B. |last5=Levin |first5=B. R. |title=Biological and biomedical implications of the coevolution of pathogens and their hosts |journal=[[Nature Genetics]] |date=December 2002 |pmid=12457190 |volume=32 |issue=4 |pages=569–77 |url=http://www.era.lib.ed.ac.uk/bitstream/1842/689/2/Charlesworth_Woolhouse.pdf|hdl=1842/689 |s2cid=33145462 |hdl-access=free }}</ref>许多病毒作为专性寄生者的一个普遍特征是它们与各自宿主的共同演化。这两个物种之间的相关突变使它们进入了进化的军备竞赛。无论是哪种生物、宿主或寄生物，如果不能跟上其他生物的步伐，它们就会从它们的栖息地消失，而平均适合度较高的物种会幸存下来。这种竞争的假说被称为红皇后假说。<ref>{{cite journal |author=Van Valen, L. |date=1973 |title=A New Evolutionary Law |journal=Evolutionary Theory |volume=1 |pages=1–30}} cited in: [http://pespmc1.vub.ac.be/REDQUEEN.html The Red Queen Principle]</ref>红皇后假说预测有性生殖可以让寄主在寄生者之前保持领先，就像''爱丽丝镜中奇遇''的红皇后比赛一样：“尽你所能跑而仍保留在同一个地方。”。<ref>{{cite book |last=Carroll |first=Lewis |author-link=Lewis Carroll |orig-year=1871 |title=Through the Looking-glass: And what Alice Found There |url=https://books.google.com/books?id=cJJZAAAAYAAJ |publisher=Macmillan |date=1875 |page=42 |quote=it takes all the running ''you'' can do, to keep in the same place.}}</ref>宿主进行有性繁殖，产生一些对寄生物具有免疫力的后代，然后进化为应对措施。<ref>{{cite journal |doi=10.1038/srep10004 |last=Rabajante |first=J. |display-authors=etal |title=Red Queen dynamics in multi-host and multi-parasite interaction system |journal=[[Scientific Reports]] |year=2015 |volume=5 |pages=10004 |pmid=25899168 |pmc=4405699|bibcode=2015NatSR...510004R}}</ref>

The parasite–host relationship probably drove the prevalence of sexual reproduction over the more efficient asexual reproduction. It seems that when a parasite infects a host, sexual reproduction affords a better chance of developing resistance (through variation in the next generation), giving sexual reproduction variability for fitness not seen in the asexual reproduction, which produces another generation of the organism susceptible to infection by the same parasite. Coevolution between host and parasite may accordingly be responsible for much of the genetic diversity seen in normal populations, including blood-plasma polymorphism, protein polymorphism, and histocompatibility systems.

The parasite–host relationship probably drove the prevalence of sexual reproduction over the more efficient asexual reproduction. It seems that when a parasite infects a host, sexual reproduction affords a better chance of developing resistance (through variation in the next generation), giving sexual reproduction variability for fitness not seen in the asexual reproduction, which produces another generation of the organism susceptible to infection by the same parasite. Coevolution between host and parasite may accordingly be responsible for much of the genetic diversity seen in normal populations, including blood-plasma polymorphism, protein polymorphism, and histocompatibility systems.

The parasite–host relationship probably drove the prevalence of sexual reproduction over the more efficient asexual reproduction. It seems that when a parasite infects a host, sexual reproduction affords a better chance of developing resistance (through variation in the next generation), giving sexual reproduction variability for fitness not seen in the asexual reproduction, which produces another generation of the organism susceptible to infection by the same parasite. Coevolution between host and parasite may accordingly be responsible for much of the genetic diversity seen in normal populations, including blood-plasma polymorphism, protein polymorphism, and histocompatibility systems.

The parasite–host relationship probably drove the prevalence of sexual reproduction over the more efficient asexual reproduction. It seems that when a parasite infects a host, sexual reproduction affords a better chance of developing resistance (through variation in the next generation), giving sexual reproduction variability for fitness not seen in the asexual reproduction, which produces another generation of the organism susceptible to infection by the same parasite. Coevolution between host and parasite may accordingly be responsible for much of the genetic diversity seen in normal populations, including blood-plasma polymorphism, protein polymorphism, and histocompatibility systems.

寄生-宿主的关系可能导致了有性生殖的流行，而不是更有效率的无性生殖。看起来，当寄生者感染宿主时，有性生殖提供了一个更好的机会来发展抵抗性（通过下一代的变异） ，这种使得适应性的有性生殖变异性在无性生殖中看不到，这就产生了另一代的有机体，易受同一寄生者的感染。<ref>{{cite web |title=Sexual reproduction works thanks to ever-evolving host, parasite relationships |website=PhysOrg |url=https://phys.org/news/2011-07-sexual-reproduction-ever-evolving-host-parasite.html |date=7 July 2011}}</ref><ref>{{cite journal |author1=Morran, L.T. |author2=Schmidt, O.G. |author3=Gelarden, I.A. |author4=Parrish, R.C. II |author5= Lively, C.M. |title=Running with the Red Queen: Host-Parasite Coevolution Selects for Biparental Sex |journal=Science |volume=333 |issue=6039 |pages=216–8 |date=8 July 2011 |id=Science.1206360 |bibcode=2011Sci...333..216M |doi=10.1126/science.1206360 |pmid=21737739 |pmc=3402160}}</ref><ref>{{cite encyclopedia |author=Hogan, C. Michael |date=2010 |url=https://editors.eol.org/eoearth/wiki/Virus |title=Virus |encyclopedia=Encyclopedia of Earth |editor=Cutler Cleveland |editor2=Sidney Draggan}}</ref>宿主和寄生者之间的共同进化可能相应地导致了正常人群中的许多遗传多样性，包括血浆多态性、蛋白多态性和组织相容性系统。<ref>{{cite journal |author1=Anderson, R. |author2=May, R. |date=October 1982 |title=Coevolution of hosts and parasites |journal=Parasitology |volume=85 |issue=2 |pages=411–426 |doi=10.1017/S0031182000055360 |pmid=6755367}}</ref>

寄生者和宿主的关系可能导致了有性生殖的流行，而不是更有效率的无性生殖。看起来，当寄生者感染宿主时，有性生殖提供了一个更好的机会来发展抵抗性（通过下一代的变异） ，这种可导致适应性的有性生殖变异性在无性生殖中则看不到，这样就更容易会产生另一代易受同一寄生者的感染的机体。<ref>{{cite web |title=Sexual reproduction works thanks to ever-evolving host, parasite relationships |website=PhysOrg |url=https://phys.org/news/2011-07-sexual-reproduction-ever-evolving-host-parasite.html |date=7 July 2011}}</ref><ref>{{cite journal |author1=Morran, L.T. |author2=Schmidt, O.G. |author3=Gelarden, I.A. |author4=Parrish, R.C. II |author5= Lively, C.M. |title=Running with the Red Queen: Host-Parasite Coevolution Selects for Biparental Sex |journal=Science |volume=333 |issue=6039 |pages=216–8 |date=8 July 2011 |id=Science.1206360 |bibcode=2011Sci...333..216M |doi=10.1126/science.1206360 |pmid=21737739 |pmc=3402160}}</ref><ref>{{cite encyclopedia |author=Hogan, C. Michael |date=2010 |url=https://editors.eol.org/eoearth/wiki/Virus |title=Virus |encyclopedia=Encyclopedia of Earth |editor=Cutler Cleveland |editor2=Sidney Draggan}}</ref>宿主和寄生者之间的共同演化可能相应导致了在普遍的群体中的许多遗传多样性，包括血浆多态性、蛋白多态性和组织相容性系统。<ref>{{cite journal |author1=Anderson, R. |author2=May, R. |date=October 1982 |title=Coevolution of hosts and parasites |journal=Parasitology |volume=85 |issue=2 |pages=411–426 |doi=10.1017/S0031182000055360 |pmid=6755367}}</ref>

[[File:Reed warbler cuckoo.jpg|upright|thumb|[[Brood parasite]]: [[Eurasian reed warbler]] raising a [[common cuckoo]]<ref name=Weiblen/>|链接=Special:FilePath/Reed_warbler_cuckoo.jpg]]

[[File:Reed warbler cuckoo.jpg|upright|thumb|[[Brood parasite|巢穴寄生：]][[Eurasian reed warbler|芦苇莺]] 在供养一只 [[common cuckoo|大杜鹃]]<ref name="Weiblen" />|链接=Special:FilePath/Reed_warbler_cuckoo.jpg]]

===Brood parasites===

===巢穴寄生===

{{Main|Brood parasitism}}

{{Main|Brood parasitism}}

Brood parasitism demonstrates close coevolution of host and parasite, for example in some cuckoos. These birds do not make their own nests, but lay their eggs in nests of other species, ejecting or killing the eggs and young of the host and thus having a strong negative impact on the host's reproductive fitness. Their eggs are camouflaged as eggs of their hosts, implying that hosts can distinguish their own eggs from those of intruders and are in an evolutionary arms race with the cuckoo between camouflage and recognition. Cuckoos are counter-adapted to host defences with features such as thickened eggshells, shorter incubation (so their young hatch first), and flat backs adapted to lift eggs out of the nest.

Brood parasitism demonstrates close coevolution of host and parasite, for example in some cuckoos. These birds do not make their own nests, but lay their eggs in nests of other species, ejecting or killing the eggs and young of the host and thus having a strong negative impact on the host's reproductive fitness. Their eggs are camouflaged as eggs of their hosts, implying that hosts can distinguish their own eggs from those of intruders and are in an evolutionary arms race with the cuckoo between camouflage and recognition. Cuckoos are counter-adapted to host defences with features such as thickened eggshells, shorter incubation (so their young hatch first), and flat backs adapted to lift eggs out of the nest.

巢寄生证明了宿主和寄生者的密切共同演化，例如一些杜鹃。这些鸟不自己筑巢，而是在其他物种的巢中产卵，排除或杀死寄主的卵和幼鸟，从而对寄主的良性生殖产生严重的负面影响。它们的卵伪装成它们寄主的卵，这意味寄主是能够区分自己的卵和入侵者的卵的，并且与杜鹃处于一种伪装和识别之间进化的军备竞赛中。杜鹃与寄主相反，具有加厚的蛋壳、较短的孵化期（所以它们的幼鸟会先孵化）和适于将蛋提出巢外的平脊等特征。<ref name="Weiblen">{{cite web |last1=Weiblen |first1=George D. |title=Interspecific Coevolution |url=http://geo.cbs.umn.edu/Weiblen2003.pdf |publisher=Macmillan |date=May 2003}}</ref><ref>{{cite journal |last1=Rothstein |first1=S.I |year=1990 |title=A model system for coevolution: avian brood parasitism |journal=Annual Review of Ecology and Systematics |volume=21 |pages=481–508 |doi=10.1146/annurev.ecolsys.21.1.481}}</ref><ref>{{Cite book|title=Cuckoo : cheating by nature|last=Davies, N. B. (Nicholas B.), 1952-|others=McCallum, James (Wildlife artist)|date=7 April 2015|isbn=978-1-62040-952-7|edition=First U.S.|location=New York, NY|oclc=881092849}}</ref>

巢穴寄生表明了宿主和寄生者密切的共同演化，例如一些杜鹃。这些鸟不自己筑巢，而是在其他物种的巢中产卵，排除或杀死寄主的卵和幼鸟，从而对寄主的生殖良性产生严重的负面影响。它们的卵伪装成它们寄主的卵，这意味寄主是能够区分自己的卵和入侵者的卵的，并且与杜鹃处于一种伪装和识别之间进化的军备竞赛中。杜鹃与寄主相反，具有加厚的蛋壳、较短的孵化期（所以它们的幼鸟会先孵化）和适于将蛋提出巢外的平脊等特征。<ref name="Weiblen">{{cite web |last1=Weiblen |first1=George D. |title=Interspecific Coevolution |url=http://geo.cbs.umn.edu/Weiblen2003.pdf |publisher=Macmillan |date=May 2003}}</ref><ref>{{cite journal |last1=Rothstein |first1=S.I |year=1990 |title=A model system for coevolution: avian brood parasitism |journal=Annual Review of Ecology and Systematics |volume=21 |pages=481–508 |doi=10.1146/annurev.ecolsys.21.1.481}}</ref><ref>{{Cite book|title=Cuckoo : cheating by nature|last=Davies, N. B. (Nicholas B.), 1952-|others=McCallum, James (Wildlife artist)|date=7 April 2015|isbn=978-1-62040-952-7|edition=First U.S.|location=New York, NY|oclc=881092849}}</ref>

=== 拮抗性的共同演化 ===

=== 拮抗性的共同演化 ===

Antagonistic coevolution is seen in the [[harvester ant]] species ''[[Pogonomyrmex barbatus]]'' and ''[[Pogonomyrmex rugosus]]'', in a relationship both parasitic and mutualistic. The queens are unable to produce worker ants by mating with their own species. Only by crossbreeding can they produce workers. The winged females act as parasites for the males of the other species as their sperm will only produce sterile hybrids. But because the colonies are fully dependent on these hybrids to survive, it is also mutualistic. While there is no genetic exchange between the species, they are unable to evolve in a direction where they become too genetically different as this would make crossbreeding impossible.<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>

Antagonistic coevolution is seen in the [[harvester ant]] species ''[[Pogonomyrmex barbatus]]'' and ''[[Pogonomyrmex rugosus]]'', in a relationship both parasitic and mutualistic. The queens are unable to produce worker ants by mating with their own species. Only by crossbreeding can they produce workers. The winged females act as parasites for the males of the other species as their sperm will only produce sterile hybrids. But because the colonies are fully dependent on these hybrids to survive, it is also mutualistic. While there is no genetic exchange between the species, they are unable to evolve in a direction where they become too genetically different as this would make crossbreeding impossible.

Antagonistic coevolution is seen in the harvester ant species Pogonomyrmex barbatus and Pogonomyrmex rugosus, in a relationship both parasitic and mutualistic. The queens are unable to produce worker ants by mating with their own species. Only by crossbreeding can they produce workers. The winged females act as parasites for the males of the other species as their sperm will only produce sterile hybrids. But because the colonies are fully dependent on these hybrids to survive, it is also mutualistic. While there is no genetic exchange between the species, they are unable to evolve in a direction where they become too genetically different as this would make crossbreeding impossible.

Antagonistic coevolution is seen in the harvester ant species Pogonomyrmex barbatus and Pogonomyrmex rugosus, in a relationship both parasitic and mutualistic. The queens are unable to produce worker ants by mating with their own species. Only by crossbreeding can they produce workers. The winged females act as parasites for the males of the other species as their sperm will only produce sterile hybrids. But because the colonies are fully dependent on these hybrids to survive, it is also mutualistic. While there is no genetic exchange between the species, they are unable to evolve in a direction where they become too genetically different as this would make crossbreeding impossible.

拮抗性的共同演化关系在收获蚁种 ''Pogonomyrmex barbatus'' 和 ''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，他们才能繁殖工蚁。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，但它们不能朝着基因差异太大的方向进化，因为这将使杂交繁殖变得不可能。

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进化，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==

==Predators and prey==