Does water facilitate gene flow in spore-producing plants? Insights from the fine-scale genetic structure of the aquatic moss Rhynchostegium riparioides (Brachytheciaceae)

Hutsemékers, Virginie; Hardy, Olivier J.; Vanderpoorten, Alain

doi:10.1016/j.aquabot.2013.02.001

Cited by 28 publications

(24 citation statements)

References 58 publications

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“…() pointed out, the scale of the observed structured pattern corresponds to the distance of a few metres, at which the density of diaspores from parental sporophytes is the highest (Sundberg, ; and references therein). This pattern is further confirmed by strong spatial structure patterns of genetic variation at fine spatial scales consistently reported in bryophytes in general (Hutsemékers, Hardy, & Vanderpoorten, ; Korpelainen, von Crautlein, Kostamo, & Virtanen, ), and epiphytic bryophytes in particular (Patiño et al., ; Snäll, Fogelqvist, Ribeiro, & Lascoux, ). Conducting a multiyear demographical census of epiphyllous communities transplanted from continuous forests into a network of fragmented sites, Zartman & Shaw () further evidenced the crucial role of migrations in shaping epiphyllous liverwort distribution and abundance patterns.…”

Section: Discussionsupporting

confidence: 66%

Trees as habitat islands: Temporal variation in alpha and beta diversity in epiphytic laurel forest bryophyte communities

Patiño

Gómez‐Rodríguez

Pupo-Correia

et al. 2018

Journal of Biogeography

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Aim Trees represent striking examples of habitat islands, with various degrees of spatial isolation and evolving properties during their life cycle. Here, we investigate whether changes in habitat conditions, dispersal limitations or competition cause variation in patterns of epiphytic species richness and turnover. Location Madeira island. Taxon Bryophytes. Methods Using linear mixed effect models, we test whether species richness exhibits a monotonic or hump‐shaped relationship with time. Two groups of host‐tree species, late‐ and early‐successional, were considered. We further identify the mechanisms explaining the observed variation in species composition by dividing beta diversity into its nestedness (βsne) and turnover (βsim) components and correlating them with tree age and geographical distance among trees. Results The best‐fit models all included tree age (T), but its quadratic term (T2) and tree height (H, here a surrogate of area) were not systematically included. βsim, but not βsne, correlated with host‐tree age, and both βsim and βsne correlated with geographical distance. Main conclusions Tree age was consistently included in all of the best‐fit models, reflecting the progressive increase in epiphyte bryophyte species richness through time. The limited contribution of T2 and H to the best models suggests that competition for space is not a key factor on mature trees. The correlation of βsim, but not βsne, with host‐tree age, and of βsim and βsne with distance among trees, suggests that variation in species composition is caused by (1) temporal community shifts due to allogenic drivers and (2) dispersal limitations, which are reflected by the higher similarity of the epiphyte communities on clustered trees rather than by an increasing probability of colonization with tree age. Since actual ancient laurel forests may no longer exist in Madeira, the conservation of clusters of late‐successional trees, enhancing connectivity at small spatial scales, is of utmost importance for the conservation and recovery of the unique laurel forest epiphytic flora.

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Section: Discussionsupporting

confidence: 66%

Trees as habitat islands: Temporal variation in alpha and beta diversity in epiphytic laurel forest bryophyte communities

Patiño

Gómez‐Rodríguez

Pupo-Correia

et al. 2018

Journal of Biogeography

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“…This assumption has been confirmed genetically by inbreeding coefficients (F is ) values close to 1 in the bisexual species investigated to date Hutsem ekers, Hardy & Vanderpoorten 2013).…”

Section: S E L E C T I O N a N D S C O R I N G O F L I F E -H I S T Omentioning

confidence: 61%

Baker's law and the island syndromes in bryophytes

et al. 2013

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Summary1. The evolution of island syndromes has long served as a model to understand the mechanisms accounting for phenotypic differentiation. Combining literature data with actual observations, we determine whether typical syndromes such as the loss of dispersal power and the bias towards selfcompatibility (Baker's law) apply to vagile organisms, using bryophytes as a model. 2. The life-history traits (LHTs) observed in oceanic island floras were statistically different from those observed on continents, evidencing the evolution of island syndromes. In contrast, LHTs of continental and continental island floras were similar, pointing to differences in migration intensity between continents, continental islands and oceanic islands. 3. The proportion of bisexual species was significantly higher on oceanic islands than on continents. A significant proportion of species that are unisexual or bisexual on continents shifted towards exclusive bisexuality on oceanic islands, suggesting that Baker's law applies to bryophytes. The underlying mechanisms, however, probably differ from in situ selection for selfing. 4. The proportion of species producing specialized asexual diaspores, which are assumed to play a role in short-distance dispersal (SDD), was higher on oceanic islands than on continents. The proportion of species producing spores, which are involved in long-distance dispersal (LDD), exhibited the reverse trend, suggesting a shift in the prevalent reproductive strategy to favour SDD on oceanic islands. Approximately 50% of the species, however, maintained the ability to produce sporophytes on oceanic islands, and the relative frequency of fertile shoots within collections of four model species was even higher on islands than on continents. 5. Synthesis. Bryophytes exhibit typical island syndromes, indicating that migration rates between oceanic islands and continents are not sufficient to prevent the effects of genetic drift and contradicting the view that the sea does not impede migration in the group. Significant shifts in life-history traits (LHTs) towards increased production of specialized asexual diaspores and decreased sporophyte production on oceanic islands indeed point to a global loss of long-distance dispersal (LDD) ability. The maintenance of traits characteristic for LDD in a large number of species has, however, substantial consequences for our understanding of island plant evolution, and in particular, for our vision of islands as evolutionary dead ends.

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“…Surprisingly, there was no eff ect at the smallest scale (1 km), even when the actual number of occurrences of the species in the surrounding area was used as the explanatory variable. However, as noted in the introduction several other studies on genetic structure and occurrence patterns suggest more restricted dispersal at a landscape scale (Sn ä ll et al 2004a, Hutsem é kers et al 2013, Korpelainen et al 2013, Rosengren et al 2013. Initially, this appears to be counterintuitive since we know that there is a steep decline in deposition of diaspores (also shown for spores) from a point source (S ö derstr ö m and Jonsson 1989, Bullock and Clarke 2000, Roads and Longton 2003, Sundberg 2005, L ö nnell et al 2012.…”

Section: Discussionmentioning

confidence: 91%

Production of diaspores at the landscape level regulates local colonization: an experiment with a spore‐dispersed moss

Lönnell¹,

Jonsson²,

Hylander³

2014

Ecography

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Eff ective dispersal is crucial to species inhabiting transient substrates in order for them to be able to persist in a landscape. Bryophytes, pteridophytes, lichens and fungi all have wind-dispersed small diaspores and can be effi ciently dispersed if their diaspores reach air masses above canopy height. However, empirical data on dispersal over landscape scales are scarce. We investigated how the colonization of an acrocarpous clay-inhabiting pioneer moss, Discelium nudum, varied between sites that diff ered in connectivity to potential dispersal sources at spatial scales from 1 to 20 km in a region in northern Sweden. We recorded the colonization on ~ 25 introduced clay heaps at each of 14 experimental sites some months after the dispersal period. Th e colonization rate ranged from 0 -82% and had a statistically signifi cant relationship with a proxy for potential habitats (amount of clay-dominated soil) in a buff er of 20 km radius surrounding the experimental sites (and also weakly with the amount of substrate in a 10 km buff er). Th ere were no signifi cant relationships between colonization rate and connectivity at smaller scales (1 and 5 km). We made a rough estimate of the number of spores available for dispersal in a landscape, given the amount of clay-dominated soil, by recording the number of Discelium nudum colonies in two 25 ϫ 25 km landscapes. Th e estimated available spore numbers in the diff erent 20 km buff ers were of the same order of magnitude as the deposition densities at the experimental sites calculated from the colonization rates. Th e results suggest that the spores of species with scattered occurrences and small diaspores (25 μ m) in open landscapes can be deposited over extensive areas, at rates high enough to drive colonization patterns. Th is also implies that regional connectivity may be more important than local connectivity for these kinds of species.

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Does water facilitate gene flow in spore-producing plants? Insights from the fine-scale genetic structure of the aquatic moss Rhynchostegium riparioides (Brachytheciaceae)

Cited by 28 publications

References 58 publications

Trees as habitat islands: Temporal variation in alpha and beta diversity in epiphytic laurel forest bryophyte communities

Trees as habitat islands: Temporal variation in alpha and beta diversity in epiphytic laurel forest bryophyte communities

Baker's law and the island syndromes in bryophytes

Production of diaspores at the landscape level regulates local colonization: an experiment with a spore‐dispersed moss

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