Prezygotic resource‐allocation dynamics and reproductive trade‐offs in Calymperaceae (Bryophyta)

Pereira, Marta R.; Dambros, Cristian S.; Zartman, Charles E.

doi:10.3732/ajb.1600240

Cited by 12 publications

(11 citation statements)

References 59 publications

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“…30 mm in A. aculeatum and enclosure of seeds within a 10–16 cm globose, functionally indehiscent woody capsule in B. excelsa ). The strong IBD pattern revealed here is, nonetheless, consistent with the dispersal traits of the studied species, including the absence of male expression ( S. annotinus , Pereira et al ., 2016), the prevalence of dioicy in Calymperaceae associated with low sporophyte production (Pereira et al ., 2019b), the immersion of the sporophytes within perichaetial leaves or very short setae ( S. annotinus , S. helicophyllus ), and reduced peristomes ( S. annotinus , S. hornschuchii ). This strong IBD pattern is also consistent with the fact that, while bryophyte species are mostly wind‐dispersed (see Patiño & Vanderpoorten, 2018 for review), anemochorous plants in dense tropical rainforests typically exhibit tighter clusters than animal‐dispersed species because of the barriers imposed by the dense forest canopy on wind speed (Seidler & Plotkin, 2006).…”

Section: Discussionmentioning

confidence: 99%

What do tropical cryptogams reveal? Strong genetic structure in Amazonian bryophytes

et al. 2020

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Lowland tropical bryophytes have been perceived as excellent dispersers. In such groups, the inverse isolation hypothesis proposes that spatial genetic structure is erased beyond the limits of short-distance dispersal. Here, we determine the influence of environmental variation and geographic barriers on the spatial genetic structure of a widely dispersed and phylogenetically independent sample of Amazonian bryophytes. Single nucleotide polymorphism data were produced from a restriction site-associated DNA sequencing protocol for 10 species and analyzed through F-statistics and Mantel tests. Neither isolation-by-environment nor the impact of geographic barriers were recovered from the analyses. However, significant isolation-by-distance patterns were observed for 8 out of the 10 investigated species beyond the scale of short-distance dispersal (> 1 km), offering evidence contrary to the inverse isolation hypothesis. Despite a cadre of life-history traits and distributional patterns suggesting that tropical bryophytes are highly vagile, our analyses reveal spatial genetic structures comparable to those documented for angiosperms, whose diaspores are orders of magnitude larger. Dispersal limitation for tropical bryophytes flies in the face of traditional assumptions regarding their dispersal potential, and suggests that the plight of this component of cryptic biodiversity is more dire than previously considered in light of accelerated forest fragmentation in the Amazon.

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Section: Discussionmentioning

confidence: 99%

What do tropical cryptogams reveal? Strong genetic structure in Amazonian bryophytes

et al. 2020

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“…Individuals of S. annotinus and S. simmondsii in fact grow in the close vicinity of each other, so that sperm cells may reach the archegonia of a non‐conspecific female individual. In a one‐year monitoring survey of sex expression, Pereira et al () failed, however, to find expressed males and sporophytes in S. annotinus , while expressed males and sporophytes were found in <1% and 5% of investigated individuals, respectively, in S. simmondsii . Since gametangia production was positively correlated with precipitation (Pereira et al, ), we hypothesize that interspecific gene flow reported here dates back to historical periods of increased sexual reproduction associated with historically wetter climates.…”

Section: Discussionmentioning

confidence: 98%

Maintenance of genetic and morphological identity in two siblingSyrrhopodonspecies (Calymperaceae, Bryopsida) despite extensive introgression

Pereira

Ledent

Mardulyn

et al. 2019

J of Sytematics Evolution

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Bryophytes are a group of land plants in which the role of hybridization has long been challenged. Using genotyping by sequencing to circumvent the lack of molecular variation at selected loci previously used for phylogeny and morphology, we determine the level of genetic and morphological divergence and reproductive isolation between the sibling Syrrhopodon annotinus and S. simmondsii (Calymperaceae, Bryopsida) that occur in sympatry but in different habitats in lowland Amazonian rainforests. A clear morphological differentiation and a low (0.06), but significant Fst derived from the analysis of 183 single nucleotide polymorphisms were observed between the two species. Conspecific pairs of individuals consistently exhibited higher average kinship coefficients along a gradient of geographic isolation than interspecific pairs. The weak, but significant genetic divergence observed is consistent with growing evidence that ecological specialization can lead to genetic differentiation among bryophyte species. Nevertheless, the spatial genetic structures of the two species were significantly correlated, as evidenced by the significant slope of the Mantel test based on kinship coefficients between pairs of interspecific individuals and the geographic distance separating them. Interspecific pairs of individuals are thus more closely related when they are geographically closer, suggesting that isolation‐by‐distance is stronger than the interspecific reproductive barrier and pointing to interspecific gene flow. We conclude that interspecific introgression, whose role has long been questioned in bryophytes, may take place even in species wherein sporophyte production is scarce due to dioicy, raising the question as to what mechanisms maintain differentiation despite weak reproductive isolation.

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“…One hypothesis to explain this phenomenon is that the decline is associated with environmental depression on the energetic costs to produce reproductive organs (Fisher, 2011). As cause of restriction of sexual reproduction, environmental/geographical limits of either or both of sexes and geographical/genetic isolation between females and males have been reported (e.g., Pereira, Dambros, & Zartman, 2016; Vitasse et al., 2013). However, the environmental effects were much stronger than genetic effects on sexual reproduction parameters as phenology (Vitasse et al., 2013).…”

Section: Introductionmentioning

confidence: 99%

“…This may result in a best‐of‐both‐worlds reproductive strategy, where diploid spores expand in established populations and haploid spores colonize new sites. Bryophytes are ideal candidates for mating ecology studies in plants because of their haploid dominated life cycle, diverse sexual strategies, and reliance on asexual reproduction (Pereira et al., 2016). Also, they can disperse by asexual reproduction beyond the limits of sexual reproduction (Fisher, 2011; Longton, 1988).…”

Section: Introductionmentioning

confidence: 99%

Restriction of sexual reproduction in the moss Racomitrium lanuginosum along an elevational gradient

Maruo

Imura

2020

Ecology and Evolution

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Terrestrial plant populations located at the margins of species’ distributions often display reduced sexual reproduction and an increased reliance on asexual reproduction. One hypothesis to explain this phenomenon is that the decline is associated with environmental effects on the energetic costs to produce reproductive organs. In order to clarify the changing processes of sexual reproduction along an elevational gradient, we investigated the sexual reproductive parameters, such as the number of sporophytes and gametangia, in Racomitrium lanuginosum, a dioicous moss found on Mt. Fuji. Matured sporophytes were present only below 3,000 m, and the number of sporophytes per shoot tended to be lower at higher elevation habitats. The numbers of male inflorescences per shoot and antheridia per inflorescence and shoot significantly decreased with increasing elevation. In contrast, the numbers of female inflorescences per shoot and archegonia per inflorescence and shoot varied little across elevations. Synthesis. Our results suggest that the reasons for this limitation are assumed to be limitations in sporophyte development that result in abortion, and the spatial segregation between males and females. Possible reasons for the abortion of sporophytes are the inhibitory effects of low air temperature, a shortened growth period, and winter environmental conditions at higher elevations. Remarkable differences between male and female on various reproductive parameters found in this study are thought to affect the mode of sexual reproduction under the harsh environment. These differences between males and females may be caused by differences in the costs of production and development of gametangia, sensitivity to environmental stressors, and phenological patterns.

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Prezygotic resource‐allocation dynamics and reproductive trade‐offs in Calymperaceae (Bryophyta)

Cited by 12 publications

References 59 publications

What do tropical cryptogams reveal? Strong genetic structure in Amazonian bryophytes

What do tropical cryptogams reveal? Strong genetic structure in Amazonian bryophytes

Maintenance of genetic and morphological identity in two siblingSyrrhopodonspecies (Calymperaceae, Bryopsida) despite extensive introgression

Restriction of sexual reproduction in the moss Racomitrium lanuginosum along an elevational gradient

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