Mating

{{Short description|Process of pairing in biology}} {{about|sexual reproduction|the mating of mechanical components|Engineering fit|the 1991 American novel|Mating (novel){{!}}''Mating'' (novel)}} {{more citations needed|date=November 2013}} {{Use dmy dates|date=February 2024}} [[File:Blue-tailed damselflies (Ischnura elegans) mating, female typica 2.jpg|thumb|250px|Blue-tailed damselflies<br />(''Ischnura elegans'') mating]]

In biology, '''mating''' refers to the pairing of either opposite-sex or hermaphroditic organisms for the purpose of sexual reproduction.<ref name=":0">{{Cite journal |last1=Clo |first1=Josselin |last2=Abu Awad |first2=Diala |last3=Bilde |first3=Trine |last4=Bocedi |first4=Greta |last5=Haag |first5=Christoph R |last6=Pannell |first6=John |last7=Hartfield |first7=Matthew |date=2025-02-28 |title=Perspectives on mating–system evolution: comparing concepts in plants and animals |url=https://academic.oup.com/jeb/article/38/6/673/8046103 |journal=Journal of Evolutionary Biology |language=en |volume=38 |issue=6 |pages=673–692 |doi=10.1093/jeb/voaf009 |pmid=40036782 |issn=1420-9101 |archive-url=http://web.archive.org/web/20251207030250/https://academic.oup.com/jeb/article/38/6/673/8046103 |archive-date=2025-12-07}}</ref> For most species, mating is between two individuals of opposite sexes; however, for hermaphroditic species, copulation is not required because the parent organism is capable of self-fertilization (autogamy). The basis of this is a process called ''fertilization,'' which is the fusion of two gametes.<ref>{{cite web|last=The Free Dictionary|title='Fertilization' – definition of|url=http://www.thefreedictionary.com/fertilization|publisher=Farlex, Inc.|access-date=25 January 2014|archive-date=28 May 2022|archive-url=https://web.archive.org/web/20220528130546/https://www.thefreedictionary.com/fertilization|url-status=live}}</ref> One gamete from the female (egg) and one gamete from the male (sperm) is used for fertilization.<ref>{{Cite journal |last1=Siu |first1=Karen K. |last2=Serrão |first2=Vitor Hugo B. |last3=Ziyyat |first3=Ahmed |last4=Lee |first4=Jeffrey E. |date=2021-10-04 |title=The cell biology of fertilization: Gamete attachment and fusion |url=https://rupress.org/jcb/article/220/10/e202102146/212606/The-cell-biology-of-fertilization-Gamete |journal=Journal of Cell Biology |language=en |volume=220 |issue=10 |article-number=e202102146 |doi=10.1083/jcb.202102146 |issn=0021-9525 |pmc=8406655 |pmid=34459848}}</ref> ''Copulation'' is the union of the sex organs of two sexually reproducing animals for insemination and subsequent internal fertilization.<ref>{{Cite book |last=Naguib |first=Marc |url=https://books.google.com/books?id=KgTeDwAAQBAJ&pg=PA69 |title=Advances in the Study of Behavior |date=2020-04-19 |publisher=Academic Press |isbn=978-0-12-820726-0 |language=en}}</ref> Mating may also lead to external fertilization, as seen in amphibians, bony fishes and plants. The term mating also applies to similar processes in fungi and unicellular protists.

==Animals== {{Main|Animal sexual behaviour}}

Animals have multiple different mating strategies, or different ways that copulation can occur. These include random mating, disassortative mating, or assortative mating.<ref name=":0" /> Some animals will choose a mate based on their expressed phenotype, or the way they look. The human practice of live mating and artificially inseminating domesticated animals is part of animal husbandry. There are various types of mating strategies used for these animals such as pen mating (when a female is moved into a pen with a male) or paddock mating (where one male is let loose in the paddock with several females). Current agriculture practices are utilizing artificial insemination more to avoid using live mating.<ref>{{Cite web |title=Animal Agriculture |url=https://www.sciencedirect.com/book/edited-volume/9780128170526/animal-agriculture |access-date=2026-03-15 |website=ScienceDirect |language=en-us}}</ref> Mammals perform copulation via penile-vaginal penetration and ejaculation of semen.<ref>{{Cite book |last1=Birkhead |first1=Tim R. |url=https://books.google.com/books?id=FhvmHW972mAC&pg=PA701 |title=Sperm Competition and Sexual Selection |last2=Møller |first2=Anders Pape |date=1998-08-12 |publisher=Elsevier |isbn=978-0-08-054159-4 |language=en}}</ref><ref>{{Cite book |last=Dixson |first=Alan F. |url=https://books.google.com/books?id=whcvEAAAQBAJ |title=Mammalian Sexuality: The Act of Mating and the Evolution of Reproduction |date=2021-06-03 |publisher=Cambridge University Press |isbn=978-1-108-69949-5 |language=en}}</ref><ref name="Hyman1992">{{cite book|author=Libbie Henrietta Hyman|title=Hyman's Comparative Vertebrate Anatomy|url=https://books.google.com/books?id=VKlWjdOkiMwC|date=15 September 1992|publisher=University of Chicago Press|isbn=978-0-226-87013-7|access-date=21 November 2016|archive-date=1 August 2023|archive-url=https://web.archive.org/web/20230801092954/https://books.google.com/books?id=VKlWjdOkiMwC|url-status=live}}</ref>

<gallery heights="150" widths="200" mode="packed"> File:オオカミ（Gray wolf） (5339403526).jpg|Gray wolves mating File:Tortoise mating.jpg|African spurred tortoises mating File:Dogs mating.jpg|Dogs mating File:Goats mating.jpg|Goats mating File:Snails mating.jpg|Hermaphroditic snails mating File:Hoverflies mating midair.jpg|Hoverflies mating in midair File:Ladybird-Coccinellidae-mating.jpg|Ladybugs mating File:Gråsparv (Passer domesticus) - Ystad-2024.jpg|House sparrows mating </gallery>

In direct copulation in insects, the male uses its aedeagus, a structure formed from the terminal segments of the abdomen, to deposit sperm directly (though sometimes in a capsule called a spermatophore) into the female's reproductive tract. Courtship occurs before copulation and is often facilitated after receiving a chemical signal from pheromones. Some insects exhibit post-mating behaviors. It's a common occurrence for the females to store the sperm in order to continuously fertilize eggs for a period of time without having to mate again. Other behaviors include mate protection, sexual cannibalism, or chemical manipulation to prevent mating with other insects.<ref>{{Cite journal |last1=Ombuya |first1=Alfayo |last2=Guo |first2=Jianyang |last3=Liu |first3=Wanxue |date=2025-05-08 |title=Insect Mating Behaviors: A Review of the Regulatory Role of Neuropeptides |journal=Insects |volume=16 |issue=5 |pages=506 |doi=10.3390/insects16050506 |doi-access=free|issn=2075-4450 |pmc=12112582 |pmid=40429219}}</ref>

Other animals reproduce sexually with external fertilization, including many fish species. Certain vertebrates reproduce with internal fertilization through cloacal copulation. This occurs in reptiles, some fish, and most birds.<ref name="Hyman1992" />

==Plants and fungi== {{Main|Mating systems#In plants|Mating in fungi|Mating of yeast}}

thumb|Bee pollinating a rose Like in animals, mating in plants, fungi, and other Eukaryotes requires other methods for sexual conjugation. In vascular plants this is mostly achieved without physical contact between mating individuals. Plant pollen has the capability to produce the male gametes required for fertilization. A process called pollination is facilitated by animals in order to bring the male gametes to the female flowers. The animals (example: bees) will collect the pollen and disperse it, allowing plants to be externally fertilized.<ref>{{Cite journal |last1=Nilsson |first1=L. Anders |last2=Rabakonandrianina |first2=Elisabeth |last3=Pettersson |first3=Börge |date=December 1992 |title=Exact tracking of pollen transfer and mating in plants |url=https://www.nature.com/articles/360666a0 |journal=Nature |language=en |volume=360 |issue=6405 |pages=666–668 |doi=10.1038/360666a0 |bibcode=1992Natur.360..666N |issn=1476-4687|url-access=subscription }}</ref> In fungi, no distinguishable male or female organs exist. Fungi are primarily haploid organisms, only becoming diploid for a short period of time during karyogamy. Karyogamy is the final stage of sexual reproduction in fungi where the parental nuclei fuse to create a diploid cell with both parents genetic information. This new cell becomes a haploid again following meiosis.<ref>{{Cite journal |last1=Sun |first1=Sheng |last2=Coelho |first2=Marco A. |last3=David-Palma |first3=Márcia |last4=Huang |first4=Jun |last5=Bian |first5=Zhuyun |last6=Heitman |first6=Joseph |date=2025-06-09 |title=Fungal sexual reproduction and mating-type loci |journal=Current Biology |volume=35 |issue=11 |pages=R496–R503 |doi=10.1016/j.cub.2025.04.061 |issn=1879-0445 |pmc=12327351 |pmid=40494303 |bibcode=2025CBio...35.R496S }}</ref> ''Yeasts'' are eukaryotic microorganisms classified as fungi. Yeast reproduces asexually through a process called budding where a daughter cell grows out of the parent cell and receives its own nucleus before splitting.<ref name="YeastRef2">{{cite web |url=http://www.yeastgenome.org/VL-what_are_yeast.html |title=What are yeasts? |work=Yeast Virtual Library |date=13 September 2009 |access-date=28 November 2009 |archive-url=https://web.archive.org/web/20090226151906/http://www.yeastgenome.org/VL-what_are_yeast.html |archive-date=26 February 2009 }}</ref> Under high stress conditions, like nutrient starvation, haploid cells will die; under the same conditions, however, diploid cells of certain strains of yeast can undergo sporulation by entering sexual reproduction (meiosis) and producing a variety of haploid spores, which can go on to mate (conjugate) and reform the diploid.<ref name="Neiman2005">{{cite journal |author=Neiman, A.M. |title=Ascospore formation in the yeast Saccharomyces cerevisiae |journal=Microbiology and Molecular Biology Reviews |volume=69 |issue=4 |pages=565–584 |year=2005 |pmid=16339736 |pmc=1306807 |doi=10.1128/MMBR.69.4.565-584.2005 |bibcode=2005MMBR...69..565N }}</ref>

==Protists==

Protists are a large group of diverse eukaryotic microorganisms, mainly unicellular animals and plants, that do not form tissues.<ref name="pmid11452306">{{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 }}</ref> The earliest eukaryotes were likely protists. Mating and sexual reproduction are widespread among existing eukaryotes. In many eukaryotic species, mating is promoted by sex pheromones. Based on phylogenetic analysis, its proposed that facultative sex was present in the common ancestor of all eukaryotes and is widely utilized in protists.<ref name="pmid10229582">{{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 }}</ref>

Most protists reproduce asexually through binary or multiple fission. Many protists are also capable of sexual reproduction and can alternate between asexual and sexual. Protists generally reproduce asexually under favorable environmental conditions, but tend to reproduce sexually under stressful conditions, such as starvation or heat shock. Sexual reproduction can lead to combinations of genes that give the offspring an environmental advantage however there is also risk of developing cysts. Protists will often wait until the environment is favorable to reduce the risk of cysts.<ref>{{cite book |last1=Fowler |first1=Samantha |last2=Roush |first2=Rebecca |last3=Wise |first3=James |title=Concepts of Biology |date=2013 |publisher=OpenStax |url=https://opentextbc.ca/conceptsofbiologyopenstax/chapter/protists/ |access-date=13 November 2020 |chapter=Chapter 13: Diversity of Microbes, Fungi, and Protists |archive-date=19 April 2021 |archive-url=https://web.archive.org/web/20210419032453/https://opentextbc.ca/conceptsofbiologyopenstax/chapter/protists/}}</ref>

==References== {{reflist}}

== External links == {{Commons|Animal sex}} * [https://web.archive.org/web/20060216005917/http://tidepool.st.usm.edu/crswr/103animalreproduction.html Introduction to Animal Reproduction] * [https://www.pbs.org/wgbh/evolution/sex/advantage/ Advantages of Sexual Reproduction]

Category:Mating Category:Animal developmental biology Category:Reproduction in animals Category:Sexology Category:Sexuality Category:Ethology Category:Fertility