Someone like me: Size-assortative pairing and mating in an Amazonian fish, sailfin tetra Crenuchus spilurus
In the absence of constraints, preference for larger mates is expected to evolve, as larger individuals are typical of higher potential fitness. Large females are often more fecund and carry larger eggs (which result in higher number and better quality of offspring), whereas large males usually have...
| Autor principal: | Almeida Borghezan, Elio de |
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| Outros Autores: | Silva Pinto, Kalebe da, Zuanon, Jansen, Silva Pires, Tiago Henrique da |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
PLoS ONE
2020
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| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/14649 |
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oai:repositorio:1-14649 |
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oai:repositorio:1-14649 Someone like me: Size-assortative pairing and mating in an Amazonian fish, sailfin tetra Crenuchus spilurus Almeida Borghezan, Elio de Silva Pinto, Kalebe da Zuanon, Jansen Silva Pires, Tiago Henrique da Adult Avoidance Behavior Cannibalism Competition Courtship Expectation Female Gender Male Mate Choice Animals Body Size Brasil Characiformes Competitive Behavior Fertility Mate Choice Physiology Reproduction River Sex Factor Animalss Body Size Brasil Cannibalism Characiformes Competitive Behavior Courtship Female Fertility Male Mating Preference, Animals Reproduction Rivers Sex Factors In the absence of constraints, preference for larger mates is expected to evolve, as larger individuals are typical of higher potential fitness. Large females are often more fecund and carry larger eggs (which result in higher number and better quality of offspring), whereas large males usually have more conspicuous ornaments and are better at defending resources. However, intrasexual competition can constrain the access to larger partners, especially when opportunities for mate takeover abound. Here we investigate the relationship between individual’s size and mate choice in relation to one’s own size and their respective mate’s size using the sailfin tetra, a sexually dimorphic Amazonian fish species. We show that ornaments of larger males are exponentially more conspicuous, and larger females are more fecund and carry larger eggs. Contrary to expectation, neither males nor females associated for longer with the larger of two offered potential mates. Instead, individuals of both genders chose opposite-sex individuals of similar sizes to themselves. Additionally, similar-sized pairs were more likely to spawn than couples with higher size asymmetries. Grounded on field observations, we propose that prudent choice should be particularly important in this system, since courtship is long (often taking several days), which offers opportunities for mate takeover. Intrasexual competition, however, cannot readily explain female choice for similar-sized males. We thus suggest that such preference might be best explained by avoidance of filial cannibalism. © 2019 Borghezan et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 2020-04-24T16:59:55Z 2020-04-24T16:59:55Z 2019 Artigo https://repositorio.inpa.gov.br/handle/1/14649 10.1371/journal.pone.0222880 en Volume 14, Número 9 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf PLoS ONE |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Adult Avoidance Behavior Cannibalism Competition Courtship Expectation Female Gender Male Mate Choice Animals Body Size Brasil Characiformes Competitive Behavior Fertility Mate Choice Physiology Reproduction River Sex Factor Animalss Body Size Brasil Cannibalism Characiformes Competitive Behavior Courtship Female Fertility Male Mating Preference, Animals Reproduction Rivers Sex Factors |
| spellingShingle |
Adult Avoidance Behavior Cannibalism Competition Courtship Expectation Female Gender Male Mate Choice Animals Body Size Brasil Characiformes Competitive Behavior Fertility Mate Choice Physiology Reproduction River Sex Factor Animalss Body Size Brasil Cannibalism Characiformes Competitive Behavior Courtship Female Fertility Male Mating Preference, Animals Reproduction Rivers Sex Factors Almeida Borghezan, Elio de Someone like me: Size-assortative pairing and mating in an Amazonian fish, sailfin tetra Crenuchus spilurus |
| topic_facet |
Adult Avoidance Behavior Cannibalism Competition Courtship Expectation Female Gender Male Mate Choice Animals Body Size Brasil Characiformes Competitive Behavior Fertility Mate Choice Physiology Reproduction River Sex Factor Animalss Body Size Brasil Cannibalism Characiformes Competitive Behavior Courtship Female Fertility Male Mating Preference, Animals Reproduction Rivers Sex Factors |
| description |
In the absence of constraints, preference for larger mates is expected to evolve, as larger individuals are typical of higher potential fitness. Large females are often more fecund and carry larger eggs (which result in higher number and better quality of offspring), whereas large males usually have more conspicuous ornaments and are better at defending resources. However, intrasexual competition can constrain the access to larger partners, especially when opportunities for mate takeover abound. Here we investigate the relationship between individual’s size and mate choice in relation to one’s own size and their respective mate’s size using the sailfin tetra, a sexually dimorphic Amazonian fish species. We show that ornaments of larger males are exponentially more conspicuous, and larger females are more fecund and carry larger eggs. Contrary to expectation, neither males nor females associated for longer with the larger of two offered potential mates. Instead, individuals of both genders chose opposite-sex individuals of similar sizes to themselves. Additionally, similar-sized pairs were more likely to spawn than couples with higher size asymmetries. Grounded on field observations, we propose that prudent choice should be particularly important in this system, since courtship is long (often taking several days), which offers opportunities for mate takeover. Intrasexual competition, however, cannot readily explain female choice for similar-sized males. We thus suggest that such preference might be best explained by avoidance of filial cannibalism. © 2019 Borghezan et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
| format |
Artigo |
| author |
Almeida Borghezan, Elio de |
| author2 |
Silva Pinto, Kalebe da Zuanon, Jansen Silva Pires, Tiago Henrique da |
| author2Str |
Silva Pinto, Kalebe da Zuanon, Jansen Silva Pires, Tiago Henrique da |
| title |
Someone like me: Size-assortative pairing and mating in an Amazonian fish, sailfin tetra Crenuchus spilurus |
| title_short |
Someone like me: Size-assortative pairing and mating in an Amazonian fish, sailfin tetra Crenuchus spilurus |
| title_full |
Someone like me: Size-assortative pairing and mating in an Amazonian fish, sailfin tetra Crenuchus spilurus |
| title_fullStr |
Someone like me: Size-assortative pairing and mating in an Amazonian fish, sailfin tetra Crenuchus spilurus |
| title_full_unstemmed |
Someone like me: Size-assortative pairing and mating in an Amazonian fish, sailfin tetra Crenuchus spilurus |
| title_sort |
someone like me: size-assortative pairing and mating in an amazonian fish, sailfin tetra crenuchus spilurus |
| publisher |
PLoS ONE |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/14649 |
| _version_ |
1787141301288828928 |
| score |
11.674684 |