Mating system

{{Short description|System of sexual reproduction in a population}}

A mating system is a way in which a group is structured in relation to sexual behaviour. The precise meaning depends upon the context. With respect to animals, the term describes which males and females mate under which circumstances. Recognised systems include monogamy, polygamy (which includes polygyny, polyandry, and polygynandry), and promiscuity, all of which lead to different mate choice outcomes and thus these systems affect how sexual selection works in the species which practice them. In plants, the term refers to the degree and circumstances of outcrossing. In human sociobiology, the terms have been extended to encompass the formation of relationships such as marriage.

In plants

The primary mating systems in plants are outcrossing (cross-fertilisation), autogamy (self-fertilisation) and apomixis (asexual reproduction without fertilization, but only when arising by modification of sexual function). Mixed mating systems, in which plants use two or even all three mating systems, are not uncommon.{{cite book | author = Brown, A. H. D.| year = 1989 | chapter = Isozyme analysis of plant mating systems |editor1=Soltis, D. E. |editor2=Soltis, P. S. |editor2-link=Soltis, P. S. | title = Isozymes in Plant Biology | pages = 73–86 | publisher = Dioscorides Press | location = Portland|display-authors=etal}}

A number of models have been used to describe the parameters of plant mating systems. The basic model is the mixed mating model, which is based on the assumption that every fertilisation is either self-fertilisation or completely random cross-fertilisation. More complex models relax this assumption; for example, the effective selfing model recognises that mating may be more common between pairs of closely related plants than between pairs of distantly related plants.

In animals

File:Schimpanse Zoo Leipzig.jpgs have a promiscuous mating system.]]

File:Silverback.JPG; gorillas have a polygynous mating system.]]

{{See also|Animal sexual behaviour#Mating systems|Polygyny threshold model|Monogamous pairing in animals}}

The following are some of the mating systems generally recognized in animals:

Monogamy: One male and one female have an exclusive mating relationship. The term "pair bonding" often implies this. This is associated with one-male, one-female group compositions. There are two types of monogamy: type 1, which is facultative, and type 2, which is obligate. Facultative monogamy occurs when there are very low densities in a species. This means that mating occurs with only a single member of the opposite sex because males and females are very far apart. When a female needs aid from conspecifics in order to have a litter this is obligate monogamy. However, with this, the habitat carrying capacity is small so it means only one female can breed within the habitat.{{cite journal | last1 = Kleiman | first1 = Devra G | year = 1977 | title = Monogamy in Mammals | journal = The Quarterly Review of Biology | volume = 52 | issue = 1| pages = 39–69 | doi = 10.1086/409721 | pmid = 857268 | s2cid = 25675086 }}
Polygamy: Three types are recognized:
Polygyny (the most common polygamous mating system in vertebrates so far studied): One male has an exclusive relationship with two or more females. This is associated with one-male, multi-female group compositions. Many perennial Vespula squamosa (southern yellowjacket) colonies are polygynous.Pickett, K. M., Osborne, D. M., Wahl, D., and Wenzel, J. W. (2001). "An Enormous Nest of Vespula squamosa from Florida, the Largest Social Was Nest Reported from North America, with Notes on Colony Cycle and Reproduction", "Journal of the New York Entomological Society", 2001. Different types of polygyny exist, such as lek polygyny and resource defense polygyny. Grayling butterflies (Hipparchia semele) engage in resource defense polygyny, where females choose a territorial male based on the best oviposition site.{{Cite journal|last=Dreisig|first=H.|date=1995-02-01|title=Thermoregulation and flight activity in territorial male graylings, Hipparchia semele (Satyridae), and large skippers, Ochlodes venata (Hesperiidae)|journal=Oecologia|volume=101|issue=2|pages=169–176|doi=10.1007/BF00317280|pmid=28306787|issn=0029-8549|bibcode=1995Oecol.101..169D|s2cid=22413242}} Although most animals opt for only one of these strategies, some exhibit hybrid strategies, such as the bee species, Xylocopa micans.{{Cite journal|title = Change in mandibular and mesosomal gland contents of maleXylocopa micans (Hymenoptera: Anthophoridae) associated with mating system|journal = Journal of Chemical Ecology|date = 1990-06-01|issn = 0098-0331|pages = 1877–1885|volume = 16|issue = 6|doi = 10.1007/BF01020501|pmid = 24263991|first1 = H. J.|last1 = McAuslane|first2 = S. B.|last2 = Vinson|first3 = H. J.|last3 = Williams| bibcode=1990JCEco..16.1877M |s2cid = 35733229}}
Polyandry: One female has an exclusive relationship with two or more males. This is very rare and is associated with multi-male, multi-female group compositions. Genetic polyandry is found some insect species such as Apis mellifera (the Western Honey Bee), in which a virgin queen will mate with multiple drones during her nuptial flight whereas each drone will die immediately upon mating once. The queen will then store the sperm collected from these multiple matings in her spermatheca to use to fertilize eggs throughout the course of her entire reproductive life.
Polygynandry: Polygynandry is a slight variation of this, where two or more males have an exclusive relationship with two or more females; the numbers of males and females do not have to be equal, and in vertebrate species studied so far, the number of males is usually less. This is associated with multi-male, multi-female group compositions.
Promiscuity: A member of one sex within the social group mates with any member of the opposite sex. This is associated with multi-male, multi-female group compositions.

These mating relationships may or may not be associated with social relationships, in which the sexual partners stay together to become parenting partners. As the alternative term "pair bonding" implies, this is usual in monogamy. In many polyandrous systems, the males and the female stay together to rear the young. In polygynous systems where the number of females paired with each male is low and the male will often stay with one female to help rear the young, while the other females rear their young on their own. In polygynandry, each of the males may assist one female; if all adults help rear all the young, the system is more usually called "communal breeding". In highly polygynous systems, and in promiscuous systems, paternal care of young is rare, or there may be no parental care at all.

These descriptions are idealized, and the social partnerships are often easier to observe than the mating relationships. In particular:

the relationships are rarely exclusive for all individuals in a species. DNA fingerprinting studies have shown that even in pair-bonding, matings outside the pair (extra-pair copulations) occur with fair frequency, and a significant minority of offspring result from them. However, the offspring that are a result of extra-pair copulations usually exhibit more advantageous genes. These genes can be associated with improvements in appearance, mating, and the functioning of internal body systems.{{cite book|title=Encyclopedia of Animal Behavior|last1=Bekoff|first1=Marc|date=2004|publisher=Greenwood Press|isbn=978-0-313-32747-6|location=Westport|pages=889–891}}{{Cite web|url=https://www.researchgate.net/publication/310505282|title=Female Sneak Copulation: In: Encyclopedia of Evolutionary Psychological Science|last=Howie|first=James|date=January 2017|website=Researchgate|access-date=October 20, 2017}}
some species show different mating systems in different circumstances, for example in different parts of their geographical range, or under different conditions of food availability
mixtures of the simple systems described above may occur.

Sexual conflict occurs between individuals of different sexes that have separate or conflicting requirements for optimal mating success. This conflict may lead to competitive adaptations and co-adaptations of one or both of the sexes to maintain mating processes that are beneficial to that sex.{{cite journal|last1=Parker|first1=G. A.|title=Sexual conflict over mating and fertilization: an overview|journal=Philosophical Transactions of the Royal Society B: Biological Sciences|date=28 February 2006|volume=361|issue=1466|pages=235–259|doi=10.1098/rstb.2005.1785|pmid=16612884|pmc=1569603}}{{cite book|last1=Yasukawa|first1=Ken|last2=Tang-Martínez |first2=Zuleyma|title=Animal behavior : how and why animals do the things they do|date=2014|publisher=Praeger|location=California, USA|isbn=978-0-313-39870-4|pages=174}} Intralocus sexual conflict and interlocus sexual conflict describe the genetic influence behind sexual conflict, and are presently recognized as the most basic forms of sexual conflict.

=In humans=

Compared to other vertebrates, where a species usually has a single mating system, humans display great variety. Humans also differ by having formal marriages, which in some cultures involve negotiation and arrangement between elder relatives. Regarding sexual dimorphism (see the section about animals above), humans are in the intermediate group with moderate sex differences in body size but with relatively small testes,{{cite journal |last1=Dixson |first1=Alan |title=Copulatory and Postcopulatory Sexual Selection in Primates |journal=Folia Primatologica |date=May 2018 |volume=89 |issue=3–4 |pages=258–286 |doi=10.1159/000488105 |url=https://karger.com/fpr/article/89/3-4/258/144087/Copulatory-and-Postcopulatory-Sexual-Selection-in |access-date=31 July 2023|doi-access=free |pmid=29804108 }} indicating relatively low sperm competition in socially monogamous and polygynous human societies. One estimate is that 83% of human societies are polygynous, 0.05% are polyandrous, and the rest are monogamous. Even the last group may at least in part be genetically polygynous.The Oxford Handbook of Evolutionary Psychology, Edited by Robin Dunbar and Louise Barret, Oxford University Press, 2007, Chapter 30 Ecological and socio-cultural impacts on mating and marriage systems by Bobbi S. Low

From an evolutionary standpoint, females are more prone to practice monogamy because their reproductive success is based on the resources they are able to acquire through reproduction rather than the quantity of offspring they produce. However, males are more likely to practice polygamy because their reproductive success is based on the amount of offspring they produce, rather than any kind of benefit from parental investment.{{Cite book|title=Evolutionary Explanations of Human Behaviour|last=Cartwright|first=John. H|publisher=Taylor and Francis e-Library|year=2002|isbn=978-0-203-47064-0|location=New York, NY|pages=19}}

Polygyny is associated with an increased sharing of subsistence provided by women. This is consistent with the theory that if women raise the children alone, men can concentrate on the mating effort. Polygyny is also associated with greater environmental variability in the form of variability of rainfall. This may increase the differences in the resources available to men. An important association is that polygyny is associated with a higher pathogen load in an area which may make having good genes in a male increasingly important. A high pathogen load also decreases the relative importance of sororal polygyny which may be because it becomes increasingly important to have genetic variability in the offspring (See Major histocompatibility complex and sexual selection).

Virtually all the terms used to describe animal mating systems were adopted from social anthropology, where they had been devised to describe systems of marriage. This shows that human sexual behavior is unusually flexible since, in most animal species, one mating system dominates. While there are close analogies between animal mating systems and human marriage institutions, these analogies should not be pressed too far, because in human societies, marriages typically have to be recognized by the entire social group in some way, and there is no equivalent process in animal societies. The temptation to draw conclusions about what is "natural" for human sexual behavior from observations of animal mating systems should be resisted: a socio-biologist observing the kinds of behavior shown by humans in any other species would conclude that all known mating systems were natural for that species, depending on the circumstances or on individual differences.

As culture increasingly affects human mating choices, ascertaining what is the 'natural' mating system of the human animal from a zoological perspective becomes increasingly difficult. Some clues can be taken from human anatomy, which is essentially unchanged from the prehistoric past:

humans have a small relative size of testes to body mass in comparison to most primates;
humans have a small ejaculate volume and sperm count in comparison to other primates;{{cite journal |last1=Van der Horst |first1=Gerhard |last2=Maree |first2=Liana |title=Sperm form and function in the absence of sperm competition |journal=Molecular Reproduction and Development |date=November 2013 |volume=81 |issue=3 |pages=204–216 |doi=10.1002/mrd.22277 |pmid=24273026 |s2cid=43821455 |url=https://onlinelibrary.wiley.com/doi/full/10.1002/mrd.22277 |access-date=31 July 2023}}
as compared to most primates, humans spend more time in copulation;
as compared to most primates, humans copulate with lower frequency;
the outward signs of estrus in women (i.e. higher body temperature, breast swelling, sugar cravings, etc.), are often perceived to be less obvious in comparison to the outward signs of ovulation in most other mammals;
for most mammals, the estrous cycle and its outward signs bring on mating activity; the majority of female-initiated matings in humans coincides with estrus,{{cite journal|last1=Beach|first1=Frank|title=Sexual attractivity, proceptivity, and receptivity in female mammals|journal=Hormones and Behavior|date=1976|volume=7|issue=1|pages=105–138|doi=10.1016/0018-506x(76)90008-8|pmid=819345|s2cid=5469783}} but humans copulate throughout the reproductive cycle;
after ejaculation/orgasm in males and females, humans release a hormone that has a sedative effect;{{cite journal|last1=Esch|first1=Tobias|last2=Stefano|first2=George|title=The Neurobiology of Love|journal=Neuro Endocrinology Letters|date=June 2005|volume=26|issue=3|pages=175–92|pmid=15990719}}

Some have suggested that these anatomical factors signify some degree of sperm competition, although others have provided anatomical evidence to suggest that sperm competition risk in humans is low;

humans have a small ejaculate volume and sperm count in comparison to other primates, even though levels of genetic and societal promiscuity are highly varied across cultures,{{cite journal |first=Frank W. |last=Marlowe |date=August 2003 |title=The Mating System of Foragers in the Standard Cross-Cultural Sample |journal=Cross-Cultural Research |volume=37 |issue=3 |url=http://raptor1.bizlab.mtsu.edu/s-drive/TEFF/662/papers2010/men_dominance/The%20Mating%20System%20of%20Foragers%20in%20the%20Standard%20Cross-Cultural%20Sample.pdf |access-date=2014-02-26 |pages=282–306 |doi=10.1177/1069397103254008 |s2cid=145482562 |url-status=dead |archive-url=https://web.archive.org/web/20140302125838/http://raptor1.bizlab.mtsu.edu/s-drive/TEFF/662/papers2010/men_dominance/The%20Mating%20System%20of%20Foragers%20in%20the%20Standard%20Cross-Cultural%20Sample.pdf |archive-date=2014-03-02}}

=Genetic causes and effects=

Monogamy has evolved multiple times in animals, with homologous brain structures predicting the mating and parental strategies used by them. These homologous structures were brought about by similar mechanisms. Even though there have been many different evolutionary pathways to get to monogamy, all the studied organisms express their genes very similarly in the fore and midbrain, implying a universal mechanism for the evolution of monogamy in vertebrates.{{cite journal |last1=Young |first1=Rebecca L. |last2=Ferkin |first2=Michael H. |last3=Ockendon-Powell |first3=Nina F. |last4=Orr |first4=Veronica N. |last5=Phelps |first5=Steven M. |last6=Pogány |first6=Ákos |last7=Richards-Zawacki |first7=Corinne L. |last8=Summers |first8=Kyle |last9=Székely |first9=Tamás |last10=Trainor |first10=Brian C. |last11=Urrutia |first11=Araxi O. |last12=Zachar |first12=Gergely |last13=O’Connell |first13=Lauren A. |last14=Hofmann |first14=Hans A. |title=Conserved transcriptomic profiles underpin monogamy across vertebrates |journal=Proceedings of the National Academy of Sciences |date=22 January 2019 |volume=116 |issue=4 |pages=1331–1336 |doi=10.1073/pnas.1813775116 |pmid=30617061 |pmc=6347671 |bibcode=2019PNAS..116.1331Y |doi-access=free}} While genetics is not the exclusive cause of mating systems within animals, it is influential in many animals, particularly rodents, which have been the most heavily researched. Certain rodents’ mating systems—monogamous, polygynous, or socially monogamous with frequent promiscuity—are correlated with suggested evolutionary phylogenies, where rodents more closely related genetically are more likely to use a similar mating system, suggesting an evolutionary basis. These differences in mating strategy can be traced back to a few significant alleles that affect behaviors that are heavily influential on mating system, such as the alleles responsible for the level of parental care, how animals choose their partner(s), and sexual competitiveness, among others, which are all at least partially influenced by genetics.{{cite journal |last1=Sinervo |first1=Barry |last2=Chaine |first2=Alexis S. |last3=Miles |first3=Donald B. |title=Social Games and Genic Selection Drive Mammalian Mating System Evolution and Speciation |journal=The American Naturalist |date=February 2020 |volume=195 |issue=2 |pages=247–274 |doi=10.1086/706810|pmid=32017620 |bibcode=2020ANat..195..247S |s2cid=208584558 |url=https://hal.archives-ouvertes.fr/hal-03013292/file/Sinervo%20rodent%20mating%20systems.pdf }} While these genes may not perfectly correlate with the mating system that animals use, genetics is one factor that may lead to a species or population reproducing using one mating system over another, or even potentially multiple at different locations or points in time.

Mating systems can also have large impacts on the genetics of a population, strongly affecting natural selection and speciation. In plover populations, polygamous species tend to speciate more slowly than monogamous species do. This is likely because polygamous animals tend to move larger distances to find mates, contributing to a high level of gene flow, which can genetically homogenize many nearby subpopulations. Monogamous animals, on the other hand, tend to stay closer to their starting location, not dispersing as much.{{cite journal |last1=D'Urban Jackson |first1=Josephine |last2=Dos Remedios |first2=Natalie |last3=Maher |first3=Kathryn H. |last4=Zefania |first4=Sama |last5=Haig |first5=Susan |last6=Oyler-McCance |first6=Sara |last7=Blomqvist |first7=Donald |last8=Burke |first8=Terry |last9=Bruford |first9=Michael W. |last10=Székely |first10=Tamás |last11=Küpper |first11=Clemens |title=Polygamy slows down population divergence in shorebirds. |journal=Evolution |date=May 2017 |volume=71 |issue=5 |pages=1313–1326 |doi=10.1111/evo.13212 |pmid=28233288 |pmc=5484996|bibcode=2017Evolu..71.1313J }} Because monogamous animals don’t migrate as far, monogamous populations which are geographically closer together tend to reproductively isolate from each other more easily, and thus each subpopulation is more likely to diversify or speciate from the other nearby populations as compared to polygamous populations. In polygamous species, however, the male partner in polygynous species and female partner in polyandrous species often tend to spread further to look for mates, potentially to find more or better mates. The increased level of movement among populations leads to increased gene flow between populations, effectively making geographically distinct populations into genetically similar ones via interbreeding.{{cite journal |last1=Ritchie |first1=Michael G. |title=Sexual Selection and Speciation |journal=Annual Review of Ecology, Evolution, and Systematics |date=1 December 2007 |volume=38 |issue=1 |pages=79–102 |doi=10.1146/annurev.ecolsys.38.091206.095733}} This has been observed in some species of rodents, where generally promiscuous species were quickly differentiated into monogamous and polygamous taxa by a prominent introduction of monogamous behaviors in some populations of that species, showing the swift evolutionary effects different mating systems can have. Specifically, monogamous populations speciated up to 4.8 times faster and had lower extinction rates than non monogamous populations. Another way that monogamy has the potential to cause increased speciation is because individuals are more selective with partners and competition, causing different nearby populations of the same species to stop interbreeding as much, leading to speciation down the road.

Another potential effect of polyandry in particular is increasing the quality of offspring and reducing the probability of reproductive failure.{{cite journal |last1=Holman |first1=Luke |last2=Kokko |first2=Hanna |title=The consequences of polyandry for population viability, extinction risk and conservation |journal=Philosophical Transactions of the Royal Society B: Biological Sciences |date=5 March 2013 |volume=368 |issue=1613 |doi=10.1098/rstb.2012.0053 |pmid=23339244 |pmc=3576587}} There are many possible reasons for this, one of the possibilities being that there is greater genetic variation in families because most offspring in a family will have either a different mother or father.{{cite journal |last1=Firman |first1=Renée C. |last2=Simmons |first2=Leigh W. |title=Male house mice evolving with post-copulatory sexual selection sire embryos with increased viability: Post-copulatory sexual selection and embryo viability in mice |journal=Ecology Letters |date=January 2012 |volume=15 |issue=1 |pages=42–46 |doi=10.1111/j.1461-0248.2011.01706.x|pmid=22011211 }} This reduces the potential harm done by inbreeding, as siblings will be less closely related and more genetically diverse. Additionally, because of the increased genetic diversity among generations, the levels of reproductive fitness are also more variable, and so it is easier to select for positive traits more quickly, as the difference in fitness between members of the same generation would be greater. When many males are actively mating, polyandry can decrease the risk of extinction as well, as it can increase the effective population size. Increased effective population sizes are more stable and less prone to accumulating deleterious mutations due to genetic drift.

In microorganisms

=Bacteria=

Mating in bacteria involves transfer of DNA from one cell to another and incorporation of the transferred DNA into the recipient bacteria's genome by homologous recombination. Transfer of DNA between bacterial cells can occur in three main ways. First, a bacterium can take up exogenous DNA released into the intervening medium from another bacterium by a process called transformation. DNA can also be transferred from one bacterium to another by the process of transduction, which is mediated by an infecting virus (bacteriophage). The third method of DNA transfer is conjugation, in which a plasmid mediates transfer through direct cell contact between cells.

Transformation, unlike transduction or conjugation, depends on numerous bacterial gene products that specifically interact to perform this complex process,{{cite journal |vauthors=Chen I, Dubnau D |title=DNA uptake during bacterial transformation |journal=Nat. Rev. Microbiol. |volume=2 |issue=3 |pages=241–9 |year=2004 |pmid=15083159 |doi=10.1038/nrmicro844 |s2cid=205499369 }} and thus transformation is clearly a bacterial adaptation for DNA transfer. In order for a bacterium to bind, take up and recombine donor DNA into its own chromosome, it must first enter a special physiological state termed natural competence. In Bacillus subtilis about 40 genes are required for the development of competence and DNA uptake.{{cite journal |vauthors=Solomon JM, Grossman AD |title=Who's competent and when: regulation of natural genetic competence in bacteria |journal=Trends Genet. |volume=12 |issue=4 |pages=150–5 |year=1996 |pmid=8901420 |doi= 10.1016/0168-9525(96)10014-7}} The length of DNA transferred during B. subtilis transformation can be as much as a third and up to the whole chromosome.{{cite journal |vauthors=Akamatsu T, Taguchi H |title=Incorporation of the whole chromosomal DNA in protoplast lysates into competent cells of Bacillus subtilis |journal=Biosci. Biotechnol. Biochem. |volume=65 |issue=4 |pages=823–9 |year=2001 |pmid=11388459 |doi=10.1271/bbb.65.823 |s2cid=30118947 |doi-access=free }}{{cite journal |vauthors=Saito Y, Taguchi H, Akamatsu T |title=Fate of transforming bacterial genome following incorporation into competent cells of Bacillus subtilis: a continuous length of incorporated DNA |journal=J. Biosci. Bioeng. |volume=101 |issue=3 |pages=257–62 |year=2006 |pmid=16716928 |doi=10.1263/jbb.101.257 }} Transformation appears to be common among bacterial species, and at least 60 species are known to have the natural ability to become competent for transformation.{{cite journal |vauthors=Johnsborg O, Eldholm V, Håvarstein LS |title=Natural genetic transformation: prevalence, mechanisms and function |journal=Res. Microbiol. |volume=158 |issue=10 |pages=767–78 |year=2007 |pmid=17997281 |doi=10.1016/j.resmic.2007.09.004 |doi-access=free }} The development of competence in nature is usually associated with stressful environmental conditions, and seems to be an adaptation for facilitating repair of DNA damage in recipient cells.Bernstein H, Bernstein C, Michod RE (2012). DNA repair as the primary adaptive function of sex in bacteria and eukaryotes. Chapter 1: pp.1-49 in: DNA Repair: New Research, Sakura Kimura and Sora Shimizu editors. Nova Sci. Publ., Hauppauge, N.Y. {{ISBN|978-1-62100-808-8}} https://www.novapublishers.com/catalog/product_info.php?products_id=31918 {{Webarchive|url=https://web.archive.org/web/20131029202307/https://www.novapublishers.com/catalog/product_info.php?products_id=31918 |date=2013-10-29 }}

=Archaea=

In several species of archaea, mating is mediated by formation of cellular aggregates.

Halobacterium volcanii, an extreme halophilic archaeon, forms cytoplasmic bridges between cells that appear to be used for transfer of DNA from one cell to another in either direction.{{cite journal |vauthors=Rosenshine I, Tchelet R, Mevarech M |title=The mechanism of DNA transfer in the mating system of an archaebacterium |journal=Science |volume=245 |issue=4924 |pages=1387–9 |year=1989 |pmid=2818746 |doi= 10.1126/science.2818746|bibcode=1989Sci...245.1387R }}

When the hyperthermophilic archaea Sulfolobus solfataricus{{cite journal |vauthors=Fröls S, Ajon M, Wagner M, Teichmann D, Zolghadr B, Folea M, Boekema EJ, Driessen AJ, Schleper C, Albers SV |title=UV-inducible cellular aggregation of the hyperthermophilic archaeon Sulfolobus solfataricus is mediated by pili formation |journal=Mol. Microbiol. |volume=70 |issue=4 |pages=938–52 |year=2008 |pmid=18990182 |doi=10.1111/j.1365-2958.2008.06459.x |url=https://www.rug.nl/research/portal/files/56956856/UV_inducible_cellular_aggregation_of_the_hyperthermophilic_archaeon_Sulfolobus_solfataricus_is_mediated_by_pili_formation.pdf|doi-access=free }} and Sulfolobus acidocaldarius{{cite journal |vauthors=Ajon M, Fröls S, van Wolferen M, Stoecker K, Teichmann D, Driessen AJ, Grogan DW, Albers SV, Schleper C |title=UV-inducible DNA exchange in hyperthermophilic archaea mediated by type IV pili |journal=Mol. Microbiol. |volume=82 |issue=4 |pages=807–17 |year=2011 |pmid=21999488 |doi=10.1111/j.1365-2958.2011.07861.x |url=https://pure.rug.nl/ws/files/6771142/2011MolMicrobiolAjon.pdf|doi-access=free }} are exposed to the DNA damaging agents UV irradiation, bleomycin or mitomycin C, species-specific cellular aggregation is induced. Aggregation in S. solfataricus could not be induced by other physical stressors, such as pH or temperature shift, suggesting that aggregation is induced specifically by DNA damage. Ajon et al. showed that UV-induced cellular aggregation mediates chromosomal marker exchange with high frequency in S. acidocaldarius. Recombination rates exceeded those of uninduced cultures by up to three orders of magnitude. Frols et al. and Ajon et al. hypothesized that cellular aggregation enhances species-specific DNA transfer between Sulfolobus cells in order to provide increased repair of damaged DNA by means of homologous recombination. This response appears to be a primitive form of sexual interaction similar to the more well-studied bacterial transformation systems that are also associated with species specific DNA transfer between cells leading to homologous recombinational repair of DNA damage.{{Citation needed|date=December 2019|reason=removed citation to predatory publisher content}}

=Protists=

Protists are a large group of diverse eukaryotic microorganisms, mainly unicellular animals and plants, that do not form tissues. Eukaryotes emerged in evolution more than 1.5 billion years ago.{{cite journal |vauthors=Javaux EJ, Knoll AH, Walter MR |title=Morphological and ecological complexity in early eukaryotic ecosystems |journal=Nature |volume=412 |issue=6842 |pages=66–9 |year=2001 |pmid=11452306 |doi=10.1038/35083562 |bibcode=2001Natur.412...66J |s2cid=205018792 }} The earliest eukaryotes were likely protists. Mating and sexual reproduction are widespread among extant eukaryotes. Based on a phylogenetic analysis, Dacks and Roger{{cite journal |vauthors=Dacks J, Roger AJ |title=The first sexual lineage and the relevance of facultative sex |journal=J. Mol. Evol. |volume=48 |issue=6 |pages=779–83 |year=1999 |pmid=10229582 |doi= 10.1007/pl00013156|bibcode=1999JMolE..48..779D |s2cid=9441768 }} proposed that facultative sex was present in the common ancestor of all eukaryotes.

However, to many biologists it seemed unlikely until recently, that mating and sex could be a primordial and fundamental characteristic of eukaryotes. A principal reason for this view was that mating and sex appeared to be lacking in certain pathogenic protists whose ancestors branched off early from the eukaryotic family tree. However, several of these protists are now known to be capable of, or to recently have had, the capability for meiosis and hence mating. To cite one example, the common intestinal parasite Giardia intestinalis was once considered to be a descendant of a protist lineage that predated the emergence of meiosis and sex. However, G. intestinalis was recently found to have a core set of genes that function in meiosis and that are widely present among sexual eukaryotes.{{cite journal |vauthors=Ramesh MA, Malik SB, Logsdon JM |title=A phylogenomic inventory of meiotic genes; evidence for sex in Giardia and an early eukaryotic origin of meiosis |journal=Curr. Biol. |volume=15 |issue=2 |pages=185–91 |year=2005 |pmid=15668177 |doi=10.1016/j.cub.2005.01.003 |s2cid=17013247 |doi-access=free |bibcode=2005CBio...15..185R }} These results suggested that G. intestinalis is capable of meiosis and thus mating and sexual reproduction. Furthermore, direct evidence for meiotic recombination, indicative of mating and sexual reproduction, was also found in G. intestinalis.{{cite journal |vauthors=Cooper MA, Adam RD, Worobey M, Sterling CR |title=Population genetics provides evidence for recombination in Giardia |journal=Curr. Biol. |volume=17 |issue=22 |pages=1984–8 |year=2007 |pmid=17980591 |doi=10.1016/j.cub.2007.10.020 |s2cid=15991722 |doi-access=free |bibcode=2007CBio...17.1984C }} Other protists for which evidence of mating and sexual reproduction has recently been described are parasitic protozoa of the genus Leishmania,{{cite journal |vauthors=Akopyants NS, Kimblin N, Secundino N, Patrick R, Peters N, Lawyer P, Dobson DE, Beverley SM, Sacks DL |title=Demonstration of genetic exchange during cyclical development of Leishmania in the sand fly vector |journal=Science |volume=324 |issue=5924 |pages=265–8 |year=2009 |pmid=19359589 |pmc=2729066 |doi=10.1126/science.1169464 |bibcode=2009Sci...324..265A}} Trichomonas vaginalis,{{cite journal |vauthors=Malik SB, Pightling AW, Stefaniak LM, Schurko AM, Logsdon JM |title=An expanded inventory of conserved meiotic genes provides evidence for sex in Trichomonas vaginalis |journal=PLOS ONE |volume=3 |issue=8 |pages=e2879 |year=2008 |pmid=18663385 |pmc=2488364 |doi=10.1371/journal.pone.0002879 |bibcode=2008PLoSO...3.2879M |doi-access=free}} and acanthamoeba.{{cite journal |vauthors=Khan NA, Siddiqui R |title=Is there evidence of sexual reproduction (meiosis) in Acanthamoeba? |journal=Pathog Glob Health |volume=109 |issue=4 |pages=193–5 |year=2015 |pmid=25800982 |doi=10.1179/2047773215Y.0000000009 |pmc=4530557}}

Protists generally reproduce asexually under favorable environmental conditions, but tend to reproduce sexually under stressful conditions, such as starvation or heat shock.{{Citation needed|date=December 2019|reason=removed citation to predatory publisher content}}

=Viruses=

Both animal viruses and bacterial viruses (bacteriophage) are able to undergo mating. When a cell is mixedly infected by two genetically marked viruses, recombinant virus progeny are often observed indicating that mating interaction had occurred at the DNA level. Another manifestation of mating between viral genomes is multiplicity reactivation (MR). MR is the process by which at least two virus genomes, each containing inactivating genome damage, interact with each other in an infected cell to form viable progeny viruses. The genes required for MR in bacteriophage T4 are largely the same as the genes required for allelic recombination.{{cite journal |vauthors=Bernstein C |title=Deoxyribonucleic acid repair in bacteriophage |journal=Microbiol. Rev. |volume=45 |issue=1 |pages=72–98 |year=1981 |pmid=6261109 |pmc=281499 |doi= 10.1128/MMBR.45.1.72-98.1981}} Examples of MR in animal viruses are described in the articles Herpes simplex virus, Influenza A virus, Adenoviridae, Simian virus 40, Vaccinia virus, and Reoviridae.