Mating consequences of contrasting hermaphroditic plant sexual systems

Evolution ◽  
2018 ◽  
Vol 72 (10) ◽  
pp. 2114-2128 ◽  
Author(s):  
Caitlin E. Tomaszewski ◽  
Mason W. Kulbaba ◽  
Lawrence D. Harder
Keyword(s):  
Sexual Systems ◽  
Hermaphroditic Plant

scholarly journals Limited Dispersal, Deleterious Mutations and the Evolution of Sex

Genetics ◽  
1996 ◽  
Vol 142 (3) ◽  
pp. 1053-1060
Author(s):  
Joel R Peck
Keyword(s):  
Mathematical Model ◽  
Sexual Reproduction ◽  
Genetic Locus ◽  
Genetic Material ◽  
Plant Population ◽  
Deleterious Mutations ◽  
Animal Populations ◽  
Offspring Sex ◽  
Limited Dispersal ◽  
Hermaphroditic Plant

Abstract This study presents a mathematical model that allows for some offspring to be dispersed at random, while others stay close to their mothers. A single genetic locus is assumed to control fertility, and this locus is subject to the occurrence of deleterious mutations. It is shown that, at equilibrium, the frequency of deleterious mutations in the population is inversely related to the rate of dispersal. This is because dispersal of offspring leads to enhanced competition among adults. The results also show that sexual reproduction can lead to a decrease in the equilibrium frequency of deleterious mutations. The reason for this relationship is that sex involves the dispersal of genetic material, and thus, like the dispersal of offspring, sex enhances competition among adults. The model is described using the example of a hermaphroditic plant population. However, the results should apply to animal populations as well.

Is Hippolyte williamsi gonochoric or hermaphroditic? A multi-approach study and a review of sexual systems in Hippolyte shrimps

2008 ◽  
Vol 155 (6) ◽  
pp. 623-635 ◽  
Author(s):  
Nuxia L. Espinoza-Fuenzalida ◽  
Martin Thiel ◽  
Enrique Dupre ◽  
J. Antonio Baeza
Keyword(s):  
Sexual Systems

scholarly journals Diversity of sexual systems within different lineages of the genus Silene

AoB Plants ◽  
2015 ◽  
Vol 7 ◽  
Author(s):  
Inés Casimiro-Soriguer ◽  
Maria L. Buide ◽  
Eduardo Narbona
Keyword(s):  
Sexual Systems ◽  
Genus Silene

scholarly journals Small-scale and regional spatial dynamics of an annual plant with contrasting sexual systems

2017 ◽  
Vol 105 (4) ◽  
pp. 1044-1057 ◽  
Author(s):  
Marcel E. Dorken ◽  
Robert P. Freckleton ◽  
John R. Pannell
Keyword(s):  
Spatial Dynamics ◽  
Small Scale ◽  
Annual Plant ◽  
Sexual Systems

scholarly journals Outbreeding and inbreeding strategies in herbaceous-shrubby communities in the Venezuelan Gran Sabana Plateau

AoB Plants ◽  
2019 ◽  
Vol 11 (4) ◽  
Author(s):  
Nelson Ramírez ◽  
Omaira Hokche
Keyword(s):  
Plant Species ◽  
Carbon Metabolism ◽  
Life Form ◽  
Sex Expression ◽  
Perennial Herb ◽  
Sexual System ◽  
Dioecious Species ◽  
Successional Stage ◽  
Sexual Systems ◽  
Perennial Herbs

Abstract Breeding system, sexual system, temporal variation in sex expression and herkogamy were evaluated in seven herbaceous-shrubby communities from the Gran Sabana Plateau, Venezuela. This analysis was conducted considering the life form, substrate type, succulence, carbon metabolism, nutritional relation, successional stage, pollination system specificity and endemism of plant species. Of the 348 plant species studied, 73.8 % were hermaphrodite, 16.9 % were monoecious and 9.2 % were dioecious. Plant sexual systems such as dichogamy and herkogamy were associated with life form, nutritional relations, carbon metabolism and pollination systems. Most species were adichogamous, followed by protandrous and protogynous. Protandry was high for perennial herbs, annual herbs and trees, and protogyny was most frequent in perennial herbs. Protandrous and protogynous species were frequently anemophilous. Herkogamy was higher than non-herkogamy. Herkogamy was higher for trees, shrubs and liana; higher in monophilous and lower in anemophilous species. Most of the hermaphrodites were herkogamous and adichogamous species. In contrast, monoecy were commonly perennial herb and dichogamous species and frequently associated with anemophily. Dioecious species were trees and shrubs and with polyphilous pollination. Dioecy was the most frequent sexual system for endemic species. Hermaphrodite species were similarly distributed across plant communities. Monoecy was slightly higher for savanna and fallow than the other communities, and dioecy was higher for shrublands and secondary bushland. Most plant species were non-agamospermous, non-spontaneous self-pollinated and xenogamous. Partially self-incompatible dominated, followed by self-incompatible, partially cross-incompatible and the lowest frequency corresponded to cross-incompatible species. All these results are discussed in the context of evolutionary and ecological trends.

Semiophors and sexual systems

2015 ◽  
Vol 6 (2) ◽  
pp. 217-239 ◽  
Author(s):  
Ruth Goldstein
Keyword(s):  
Women Victims ◽  
Sexual Systems ◽  
Peruvian Coast ◽  
New Meanings

This article examines physical and linguistic sites through which women and words about women circulate along Latin America’s Interoceanic Road, running from the Brazilian to the Peruvian coast. I argue that the discourse on women circulates with specific linguistic-packaging, made and remade at different sites. In analyzing how these sites form ‘cartographies of communicability’ (Briggs 2005), this article engages Marilena Chauí’s discussion of the ‘semiophor’ (2000) to refer to people and things that once pulled out of daily circulation, take on new meanings beyond their material existence. By complicating the socially viable/acceptable identities offered/imposed upon these women – victims or voluntary agents, this article seeks to avoid reinscriptions of difference that “muzzle the subaltern” (Spivak 1988), advocating for a practice of ethnographic vigilance.

Macroevolutionary Dynamics of Sexual Systems in Spinicaudatan ‘Clam Shrimp:’ Paleobiological Assessment of Evolutionary Cannon

2014 ◽  
Vol 13 ◽  
pp. 118-119
Author(s):  
Timothy I. Astrop ◽  
Steven C. Weeks ◽  
Lisa E. Park Boush ◽  
Rafael Maia
Keyword(s):  
Sexual Systems ◽  
Clam Shrimp

scholarly journals Molecular Phylogeny of the Leafy Liverwort Lejeunea (Porellales): Evidence for a Neotropical Origin, Uneven Distribution of Sexual Systems and Insufficient Taxonomy

PLoS ONE ◽  
2013 ◽  
Vol 8 (12) ◽  
pp. e82547 ◽  
Author(s):  
Jochen Heinrichs ◽  
Shanshan Dong ◽  
Alfons Schäfer-Verwimp ◽  
Tamás Pócs ◽  
Kathrin Feldberg ◽  
...  
Keyword(s):  
Molecular Phylogeny ◽  
Uneven Distribution ◽  
Sexual Systems ◽  
Leafy Liverwort
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