The effect of size and cheliped autotomy on sexual competition between males of the mud crab Cyrtograpsus angulatus Dana
Size advantage in male-male competition over mates, combined with male preference over large females, is a common feature that can drive to size assortative mating and, eventually, sexual selection. In crabs, appendage autotomy can affect assortative mating and opportunity for sexual selection by af...
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2009
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00253162_v156_n3_p269_Daleo http://hdl.handle.net/20.500.12110/paper_00253162_v156_n3_p269_Daleo |
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paper:paper_00253162_v156_n3_p269_Daleo2023-06-08T14:53:01Z The effect of size and cheliped autotomy on sexual competition between males of the mud crab Cyrtograpsus angulatus Dana assortative mating autotomy crab intrasexual interaction intraspecific competition mating behavior size effect Cyrtograpsus angulatus Decapoda (Crustacea) Size advantage in male-male competition over mates, combined with male preference over large females, is a common feature that can drive to size assortative mating and, eventually, sexual selection. In crabs, appendage autotomy can affect assortative mating and opportunity for sexual selection by affecting size advantage in mating contests. In this work, we evaluate the effect of size and appendage autotomy in generating assortative mating in the mud crab Cyrtograpsus angulatus. Field observations of guarding pairs in two different populations show a positive correlation between carapace width of males and females in both the populations. In one of the populations, incidence of appendage autotomy was low and the variability in the size of reproductive males was lower than the variability in the size of randomly collected males (i.e. only larger males were successful in getting a female), whereas there was no differences in the other population (i.e. most male sizes were successful) where the incidence of appendage autotomy was very high, indicating that the importance of size is higher when the incidence of autotomy is low. In this context, experiments (in both populations) show that, in contests for a female, larger males outcompete smaller ones only when they had intact appendages. When males had missing chelipeds, winning or loosing against smaller males was random. This may lead to a decrease in the importance of male size in populations with high incidence of cheliped autotomy, affecting assortative mating and opportunity for selection and, thus, affecting selective pressures. © 2008 Springer-Verlag. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00253162_v156_n3_p269_Daleo http://hdl.handle.net/20.500.12110/paper_00253162_v156_n3_p269_Daleo |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
assortative mating autotomy crab intrasexual interaction intraspecific competition mating behavior size effect Cyrtograpsus angulatus Decapoda (Crustacea) |
| spellingShingle |
assortative mating autotomy crab intrasexual interaction intraspecific competition mating behavior size effect Cyrtograpsus angulatus Decapoda (Crustacea) The effect of size and cheliped autotomy on sexual competition between males of the mud crab Cyrtograpsus angulatus Dana |
| topic_facet |
assortative mating autotomy crab intrasexual interaction intraspecific competition mating behavior size effect Cyrtograpsus angulatus Decapoda (Crustacea) |
| description |
Size advantage in male-male competition over mates, combined with male preference over large females, is a common feature that can drive to size assortative mating and, eventually, sexual selection. In crabs, appendage autotomy can affect assortative mating and opportunity for sexual selection by affecting size advantage in mating contests. In this work, we evaluate the effect of size and appendage autotomy in generating assortative mating in the mud crab Cyrtograpsus angulatus. Field observations of guarding pairs in two different populations show a positive correlation between carapace width of males and females in both the populations. In one of the populations, incidence of appendage autotomy was low and the variability in the size of reproductive males was lower than the variability in the size of randomly collected males (i.e. only larger males were successful in getting a female), whereas there was no differences in the other population (i.e. most male sizes were successful) where the incidence of appendage autotomy was very high, indicating that the importance of size is higher when the incidence of autotomy is low. In this context, experiments (in both populations) show that, in contests for a female, larger males outcompete smaller ones only when they had intact appendages. When males had missing chelipeds, winning or loosing against smaller males was random. This may lead to a decrease in the importance of male size in populations with high incidence of cheliped autotomy, affecting assortative mating and opportunity for selection and, thus, affecting selective pressures. © 2008 Springer-Verlag. |
| title |
The effect of size and cheliped autotomy on sexual competition between males of the mud crab Cyrtograpsus angulatus Dana |
| title_short |
The effect of size and cheliped autotomy on sexual competition between males of the mud crab Cyrtograpsus angulatus Dana |
| title_full |
The effect of size and cheliped autotomy on sexual competition between males of the mud crab Cyrtograpsus angulatus Dana |
| title_fullStr |
The effect of size and cheliped autotomy on sexual competition between males of the mud crab Cyrtograpsus angulatus Dana |
| title_full_unstemmed |
The effect of size and cheliped autotomy on sexual competition between males of the mud crab Cyrtograpsus angulatus Dana |
| title_sort |
effect of size and cheliped autotomy on sexual competition between males of the mud crab cyrtograpsus angulatus dana |
| publishDate |
2009 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00253162_v156_n3_p269_Daleo http://hdl.handle.net/20.500.12110/paper_00253162_v156_n3_p269_Daleo |
| _version_ |
1768541927922204672 |