scholarly journals When do opposites attract? A model uncovering the evolution of disassortative mating

2021 ◽  
Author(s):  
Ludovic Maisonneuve ◽  
Thomas Beneteau ◽  
Mathieu Joron ◽  
Charline Smadi ◽  
Violaine Llaurens
Keyword(s):  
Disassortative Mating

Pollen flow in distylous populations of Amsinckia (Boraginaceae)

1976 ◽  
Vol 54 (22) ◽  
pp. 2530-2535 ◽  
Author(s):  
Fred R. Ganders
Keyword(s):  
Pollen Flow ◽  
Progeny Testing ◽  
Self Incompatibility ◽  
Disassortative Mating ◽  
Pollen Loads ◽  
Self Pollination ◽  
Incompatibility System ◽  
Total Pollen

Stigmatic pollen loads were analyzed from naturally pollinated pin and thrum form flowers of Amsinckia douglasiana and A. vernicosa var. furcata. Pin stigmas captured more total pollen than thrum stigmas. Pins experienced either net self-pollination or random pollination. Thrum stigmas experienced significant disassortative pollination. Comparing pollen loads from intact and emasculated thrum flowers of A. douglasiana indicated that self-pollination and geitonogamy were relatively unimportant in the pollination of the thrum form. The level of disassortative pollination of A. vernicosa var. furcata does not appear to be high enough to account for the level of disassortative mating observed by progeny testing, suggesting that this species may possess an incomplete stylar self-incompatibility system such as has been reported in A. grandiflora.

scholarly journals Choosy Wolves? Heterozygote Advantage But No Evidence of MHC-Based Disassortative Mating

2015 ◽  
Vol 107 (2) ◽  
pp. 134-142 ◽  
Author(s):  
Marco Galaverni ◽  
Romolo Caniglia ◽  
Pietro Milanesi ◽  
Silvana Lapalombella ◽  
Elena Fabbri ◽  
...  
Keyword(s):  
Heterozygote Advantage ◽  
Disassortative Mating

Mating patterns in self-compatible distylous populations of Amsinckia (Boraginaceae)

1975 ◽  
Vol 53 (8) ◽  
pp. 773-779 ◽  
Author(s):  
Fred R. Ganders
Keyword(s):  
Random Mating ◽  
Marker Gene ◽  
Natural Populations ◽  
Breeding Systems ◽  
High Rate ◽  
Structure Population ◽  
Disassortative Mating ◽  
Progeny Tests ◽  
Flower Form ◽  
Two Populations

Progeny tests of naturally pollinated pin- and thrum-form plants of two species of Amsinckia were conducted to determine whether net selfing, random mating, or net disassortative mating occurred in natural populations. The locus determining flower form was used as a marker gene. Amsinckia spectabilis experienced close to random mating in a dense population, but in a small, diffuse population a high rate of selfing was indicated. Pin plants of Amsinckia vernicosa var. furcata experienced 44.3% net disassortative mating, and thrum plants in this species experienced complete (100%) disassortative mating.Compared with A. spectabilis, stigmas and anthers are about twice as far apart in A. vernicosa var. furcata; yet the pollinators are essentially similar, suggesting that greater separation of stigmas and anthers greatly improves the efficiency of distyly at promoting disassortative pollination. The two populations of A. spectabilis studied indicate that autogamy and (or) geitonogamy is much higher in diffuse populations. The results support previous studies that disassortative pollination is greater in thrum-form flowers than in pin flowers. Distyly without self-incompatibility can be an effective outbreeding system but is much more sensitive to variations in floral structure, population density, and pollinator behavior than are self-incompatible breeding systems.

scholarly journals Disassortative mating in tristylous Eichhornia paniculata (Pontederiaceae)

Heredity ◽  
1987 ◽  
Vol 58 (1) ◽  
pp. 49-55 ◽  
Author(s):  
S C H Barrett ◽  
A H D Brown ◽  
J S Shore
Keyword(s):  
Disassortative Mating

scholarly journals A supergene in seaweed flies modulates male traits and female perception

2021 ◽  
Author(s):  
Swantje Enge ◽  
Claire Merot ◽  
Raimondas Mozuraitis ◽  
Violeta Apsegaite ◽  
Louis Bernatchez ◽  
...  
Keyword(s):  
Differential Expression ◽  
Balancing Selection ◽  
Cuticular Hydrocarbon ◽  
Female Mate Choice ◽  
Odorant Receptors ◽  
Disassortative Mating ◽  
Female Perceptions ◽  
Complex Adaptive ◽  
The Face ◽  
Differential Perception

Supergenes, tightly linked allelic combinations that underlie complex adaptive phenotypes represent a critical mechanism protecting intra-specific polymorphism. Supergenes represent some of the best examples of balancing selection in nature and there is increasing evidence that disassortative mating, when individuals preferentially mate with dissimilar phenotypes, is a key force stabilizing supergene polymorphisms. Yet, the underlying biological mechanisms and genetic basis of disassortative mating remain poorly known. Here, we examine a possible mechanism of disassortative mating driven by female mate choice in relation to the overdominant Cf-Inv(1) supergene in the seaweed fly Coelopa frigida by investigating chemical communication and its genomic architecture. We show that Cf-Inv(1) strongly affects chemical signaling; cuticular hydrocarbon (CHC) composition differed between genotypes in males but not females across two continents. In tandem, Cf-Inv(1) affected female perception of these compounds; females are able to sense 36 compounds from the male CHC cocktail but show differential perception between genotypes for almost half of them. This indicates that the genetic underpinnings of male traits and female perceptions are tightly linked within Cf-Inv(1) which likely facilitates disassortative mating. A differential expression approach based on candidate genes for CHC biosynthesis and odorant detection revealed differential expression for CHC biosynthesis in males alone but broad changes in odorant receptors across both sexes. Furthermore, odorant genes clustered together within Cf-Inv(1), with some of them differing between arrangements by 8.3% at the protein level, suggesting evolution via tandem duplication then divergence. We propose that the tight linkage between overdominant loci, male traits, and female perception has helped to maintain the Cf-Inv(1) polymorphism across its range in the face of supergene degeneration.

scholarly journals An investigation of MHC-dependent sexual selection in a free-living population of sheep

2020 ◽  
Author(s):  
Wei Huang ◽  
Jill G. Pilkington ◽  
Josephine M. Pemberton
Keyword(s):  
Sexual Selection ◽  
Mixed Models ◽  
Gene Clusters ◽  
Inbreeding Avoidance ◽  
Free Living ◽  
Mating Patterns ◽  
Disassortative Mating ◽  
Mhc Genes ◽  
Genome Wide ◽  
Polymorphic Gene

AbstractMHC genes are one of the most polymorphic gene clusters in vertebrates and play an essential role in adaptive immunity. There is evidence that sexual selection also plays a role in maintaining MHC diversity, but the specific mechanisms are controversial. In this study, we investigate evidence for non-random MHC-dependent mating patterns in a free-living population of Soay sheep. Using a large number of sheep diplotyped at the MHC class IIa region and genome-wide SNPs, together with field observations of consorts, we found sexual selection against one of eight haplotypes, C, in males at the pre-copulatory stage and sexual selection on female MHC heterozygosity acting in opposition directions at the pre- and post-copulatory stages. We also found disassortative mating at the post-copulatory stage, along with strong evidence of inbreeding avoidance at both stages. However, results from generalized linear mixed models suggest that the pattern of MHC-dependent disassortative mating could be a by-product of inbreeding avoidance. These results suggest that there is selection on the MHC at the pre- and post-copulatory stages, but that apparent disassortative mating with respect to the MHC may be driven by inbreeding avoidance.

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