Local shifts in floral biotic interactions in habitat edges and their effect on quantity and quality of plant offspring

Gargano, Domenico; Fenu, Giuseppe; Bernardo, Liliana

doi:10.1093/aobpla/plx031

Cited by 13 publications

(14 citation statements)

References 61 publications

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“…The high levels of herbivory observed in the natural population indicated that this could be an important threat for the species due to it also affects the traits to attract pollinators (Gargano et al, 2017). In the translocated population the herbivory was lower because of the fence, but did not eliminated it.…”

Section: Discussionmentioning

confidence: 98%

“…Godefroid et al, 2011;Cogoni et al, 2013;Fenu et al, 2019). However, the population's persistence depends on several factors as the species' longevity, mating system, dispersal ability (Picó and Van Groenendael, 2007), the presence of inbreeding depression, outbreeding depression (Weisenberger et al, 2014), pollen limitation , reproductive success (Schemske et al, 1994), interaction between pollinators and herbivory (Gargano et al, 2017), among others.…”

Section: Introductionmentioning

confidence: 99%

“…The consequences of pollen limitation (poor quality or quantity of pollen) have been widely investigated in the last years (e.g. Lázaro and Traveset, 2006;Andersson et al, 2016;Gargano et al, 2017). The presence of inbreeding depression is another of the factors that influence the reproductive success.…”

Section: Introductionmentioning

confidence: 99%

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Breeding system and inbreeding depression in a translocated population of the endangered plant Dianthus morisianus (Caryophyllaceae)

Nebot

Cogoni

Fenu

et al. 2020

Flora

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Know the breeding system of endemic plants is important to design conservation strategies. Translocations are actions to improve the survival prospects of the species, but nowadays there are only a few studies that analyse their success and make a comparison between translocation and the natural populations. Dianthus morisianus is a threatened narrow endemic plant species growing on sand dunes in SW Sardinia (Italy). The objective of this study was to assess the breeding system, the presence of inbreeding depression and pollen limitation, as well as the success of the plant translocation. All these results were compared with those from the single natural population. The breeding system was tested through five pollination treatments and the reproductive success was analysed by the fruit set, seed set, seed weight, germination and mortality rate. The translocated population behaved like the natural one on fruit and seed formation. Autonomous self-pollination was lower than the other treatments regarding fruit set and seed/ovule ratio in the two studied populations. The species is self-compatible and presents partial self-fertility. The selfing rate was higher in the translocated population and the inbreeding depression presented low values for the natural population, while the translocated population presented negative values. Neither of the populations suffered pollen limitation. The species did not present reproductive problems and it is pollinator dependent. Moreover, the translocated population demonstrated high success after five years, as an increase of the population area and new recruited plants was observed; the offspring were able to flower, fruiting and reproduce. This translocation success increases the survival prospects of the species.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Breeding system and inbreeding depression in a translocated population of the endangered plant Dianthus morisianus (Caryophyllaceae)

Nebot

Cogoni

Fenu

et al. 2020

Flora

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“…The results of a study by Gargano et al . (2017) on germination of seeds of the perennial herb Dianthus balbisii (Caryophyllaceae) produced via open-pollination vs hand-pollination over a forest-open habitat gradient at five levels of illuminance in southern Italy are briefly described in Appendix B. The authors indicate that illuminance along the ecotone gradient ranges from <500 klux to >4000 klux.…”

Section: Methodsmentioning

confidence: 99%

Pollen limitation and its effect on seed germination

Baskin

2018

Seed Sci. Res.

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In nature, fruit and seed production in many plants have been shown to be pollen limited. Pollen limitation is demonstrated when open-pollinated plants that are hand-supplemented (Ps) with outcross pollen produce more fruits and/or seeds than open-pollinated controls that are not hand-pollinated (Po). There are three categories of results in such studies: Ps> Po, Ps= Poand Ps< Po, in which case pollen limitation indices are positive, zero and negative, respectively. In an index widely used to calculate pollen limitation, 1 – (Po/Ps), the bounds for Ps≥ Poare 0 to + 1, whereas the bounds for Ps< Poare 0 to –∞. The first aim of this review was to show how the pollen limitation index can be modified so that the bounds of Ps< Poare 0 and –1, whereupon the index gives equal weight to the best performer (Psor Po) and worst performer (Psor Po). In addition to seed quantity, pollen supplementation can affect seed quality, including germinability. Thus, our second aim was to summarize the results of studies that have also tested the effect of pollen limitation on seed germination. In short, the 30 case studies in 15 families, 16 genera and 18 species that we identified show that seed germination percentage increased, was not affected or decreased by pollen supplementation in 12, 11 and seven cases, respectively. The effect of pollen limitation on seed germination, which can be quite large, has not been considered in developing population growth models to determine the effect of pollen limitation on λ.

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“…Although previous work has quantified seed production (e.g. Kunin 1997 ; Burgess et al 2006 ; Ison and Wagenius 2014 ; Gargano et al 2017 ) and mate diversity ( Barriball et al 2014 ) for edge versus interior plants, the effects of spatial position on siring success and the extent of pollen-mediated gene dispersal have not previously been explored.…”

Section: Introductionmentioning

confidence: 99%

Edge effects and mating patterns in a bumblebee-pollinated plant

et al. 2020

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Abstract Researchers have long assumed that plant spatial location influences plant reproductive success and pollinator foraging behavior. For example, many flowering plant populations have small, linear, or irregular shapes that increase the proportion of plants on the edge, which may reduce mating opportunities through both male and female function. Additionally, plants that rely on pollinators may be particularly vulnerable to edge effects if those pollinators exhibit restricted foraging and pollen carryover is limited. To explore the effects of spatial location (edge vs. interior) on siring success, seed production, pollinator foraging patterns, and pollen-mediated gene dispersal, we established a square experimental array of 49 Mimulus ringens (monkeyflower) plants. We observed foraging patterns of pollinating bumblebees and used paternity analysis to quantify male and female reproductive success and mate diversity for plants on the edge vs. interior. We found no significant differences between edge and interior plants in the number of seeds sired, mothered, or the number sires per fruit. However, we found strong differences in pollinator behavior based on plant location, including 15% lower per flower visitation rates and substantially longer interplant moves for edge plants. This translated into 40% greater pollen-mediated gene dispersal for edge than for interior plants. Overall, our results suggest that edge effects are not as strong as is commonly assumed, and that different plant reproduction parameters respond to spatial location independently.

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Local shifts in floral biotic interactions in habitat edges and their effect on quantity and quality of plant offspring

Cited by 13 publications

References 61 publications

Breeding system and inbreeding depression in a translocated population of the endangered plant Dianthus morisianus (Caryophyllaceae)

Breeding system and inbreeding depression in a translocated population of the endangered plant Dianthus morisianus (Caryophyllaceae)

Pollen limitation and its effect on seed germination

Edge effects and mating patterns in a bumblebee-pollinated plant

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