Mate limited reproductive success in two dioicous mosses

Bisang, Irene; Ehrlén, Johan; Hedenäs, Lars

doi:10.1111/j.0030-1299.2004.12853.x

Cited by 65 publications

(55 citation statements)

References 30 publications

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“…With more available habitat, male and female plants could more often grow close enough to each other for fertilization, i.e. within a few decimetres of each other (Bisang et al 2004).…”

Section: Discussionmentioning

confidence: 99%

Phylogeography of Alpine populations of Rhytidium rugosum (Bryophyta) in a European context

Hedenäs

2017

Alp Botany

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The phylogeography and possible origins of the moss Rhytidium rugosum (Hedw.) Kindb. in the European Alps are studied based on information from the nuclear internal transcribed spacers 1 and 2 and a portion of the gene region for glyceraldehyde 3-phosphate dehydrogenase for 364 European specimens. Seventy-three Alps specimens were sampled from W Switzerland to W Austria, and were divided into four regional populations along a WestSouth-West (WSW) to East-North-East (ENE) gradient. These populations were compared with similar ones previously studied in other parts of Europe. The ENE-most Alps population, located ENE of the Adige break zone, deviates genetically from the other three. The two WSWmost populations of the Alps appear to be relatively isolated from most of the European populations outside the Alps, whereas the two ENE ones are similar to populations of northern Scandinavia. Populations in between the Alps and the Scandinavian mountain range deviate from those to the north and south, possibly due to low effective population sizes, earlier bottleneck events, or colonization from different source populations. Haplotype diversity and number of private haplotypes are marginally higher in the Alps than in Scandinavia. It is suggested that European Rhytidium originated from late glacial maximum refugia in (1) E-NE Europe, (2) in between the Late Glacial Maximum ice shields of Scandinavia and the Alps, and (3) S, SW, and W of the Swiss Alps. Those of the E Alps potentially originated mainly in E-NE Europe and those of the W Alps in the S, SW, and W.

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“…With more available habitat, male and female plants could more often grow close enough to each other for fertilization, i.e. within a few decimetres of each other (Bisang et al 2004).…”

Section: Discussionmentioning

confidence: 99%

Phylogeography of Alpine populations of Rhytidium rugosum (Bryophyta) in a European context

Hedenäs

2017

Alp Botany

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“…However, plants of both sexes produce many hundreds of flowers, and an adequate seed bank may be maintained even when seed set is proportionally low. Although there are no comparative studies for woody plants, a study of dioicous mosses found that fertilisation success was also limited in female-biased populations (Bisang et al 2004). overall, gender-dimorphic species had higher levels of pollen limitation than hermaphrodite species in our study, which supports Bond's (1994) extinction risk assessment.…”

Section: Both Populations Of Alseuosmia Quercifoliamentioning

confidence: 99%

Pollination performance and vulnerability to pollination breakdown of sixteen native shrub species from New Zealand

Merrett

Robertson

Peterson

2007

New Zealand Journal of Botany

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The reproductive biology of 16 native shrub species was studied in 34 populations to identify breeding systems, pollen limitation, local abundance, and population age structures. Seven of the study species are hermaphroditic, seven dioecious, and two gynodioecious. one of the 18 hermaphrodite populations (Alseuosmia macrophylla at Mamaku Plateau) had high levels of self-incompatibility and pollen limitation and mutualism failure was evident. in the gender-dimorphic taxa, two populations (Coprosma spathulata from Hakarimata and Cyathodes juniperina from Pukemokemoke) had high levels of pollen limitation and insect-pollinated species consistently ranked higher in a vulnerability assessment compared with wind-pollinated species. There was no significant relationship between natural fruit set and the distance to the nearest conspecific pollen in any of the study populations. Seedling recruitment was variable but evident in 32 of the 34 study populations and appeared to be related to availability of suitable habitat. The species we studied occur mostly on forest edges where they rely on disturbed soil and high light conditions for establishment, and edges may be important for successful reproduction of some native plants, especially shrubs. We have demonstrated that plants with self-incompatibility mechanisms and pollinator specialisation are at greater risk from pollen limitation and mutualism failure than self-compatible or generalist species.

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“…First, fertilization mainly occurs between individuals in close proximity as a consequence of short dispersal range of the swimming spermatozoids (Bisang et al, 2004). Hence, the sexual partners are principally limited to the shoots growing in the same colony.…”

Section: Introductionmentioning

confidence: 99%

Balance between inbreeding and outcrossing in a nannandrous species, the moss Homalothecium lutescens

2015

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Epiphytic dwarf males on the females present a possible solution to the problem of short fertilization distances in mosses. However, leptokurtic spore dispersal makes dwarf males likely to be closely related to their host shoot, with an accompanying risk of inbreeding. The capacity of a female to harbour a high number of different dwarf males suggests that there may be mechanisms in place that counteract inbreeding, such as polyandry and post-fertilization selection. We have genotyped sporophytes, female host shoots and dwarf males in four populations of the moss Homalothecium lutescens. We found no evidence of selective sporophyte abortion based on level of heterozygosity. The occurrence of entirely homozygous sporophytes together with significantly positive inbreeding coefficients in three of the populations (mean F IS between 0.48 and 0.64) suggest frequent mother-son mating events. However, 23% of all sampled sporophytes had a higher level of heterozygosity compared with the mean expected heterozygosity at the population level. Polyandry was frequent, on average 59% of the sporophytes on a female shoot were sired by distinct fathers. In conclusion, sporadic fertilizations by dwarf males originating from nonhost female shoots appear to counteract strong inbreeding.

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Mate limited reproductive success in two dioicous mosses

Cited by 65 publications

References 30 publications

Phylogeography of Alpine populations of Rhytidium rugosum (Bryophyta) in a European context

Phylogeography of Alpine populations of Rhytidium rugosum (Bryophyta) in a European context

Pollination performance and vulnerability to pollination breakdown of sixteen native shrub species from New Zealand

Balance between inbreeding and outcrossing in a nannandrous species, the moss Homalothecium lutescens

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