Flower number and distance to neighbours affect the fecundity of <i>Goetzea elegans</i> (Solanaceae)

Caraballo-Ortiz, Marcos A.; Santiago‐Valentín, Eugenio; Carlo, Tomás A.

doi:10.1017/s0266467411000289

Cited by 16 publications

(19 citation statements)

References 46 publications

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“…Positive DDD effects on seed production in trees have been reported frequently 29 , 30 , 64 . Pollinators tend to maximize their reward while minimizing energetic expenditures 65 and hence are attracted more to groups of conspecifics than to isolated trees.…”

Section: Discussionmentioning

confidence: 99%

Fine-scale processes shape ecosystem service provision by an Amazonian hyperdominant tree species

Thomas

Atkinson

Kettle

2018

Sci Rep

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Conspecific distance and density-dependence is a key driver of tree diversity in natural forests, but the extent to which this process may influence ecosystem service provision is largely unknown. Drawing on a dataset of >135,000 trees from the Peruvian Amazon, we assessed its manifestation in biomass accumulation and seed production of Brazil nut (Bertholletia excelsa) which plays a keystone role in carbon sequestration and NTFP harvesting in Amazonia. For the first time, we find both negative and positive effects of conspecific proximity on seed production and above ground biomass at small and large nearest neighbour distances, respectively. Plausible explanations for negative effects at small distances are fine-scale genetic structuring and competition for shared resources, whereas positive effects at large distances are likely due to increasing pollen limitation and suboptimal growth conditions. Finally, findings suggest that most field plots in Amazonia used for estimating carbon storage are too small to account for distance and density-dependent effects and hence may be inadequate for measuring species-centric ecosystem services.

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Section: Discussionmentioning

confidence: 99%

Fine-scale processes shape ecosystem service provision by an Amazonian hyperdominant tree species

Thomas

Atkinson

Kettle

2018

Sci Rep

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“…These studies also looked at the topic entirely from the plant’s point of view and did not measure the effects of vegetation height on visitation frequency or pollinator foraging behaviour. Apart from vegetation height, local density of the same or other plant species ( Bartkowska & Johnston, 2014 ), distance from neighbours ( Caraballo-Ortiz, Santiago-Valentin & Carlo, 2011 ), as well as spatial variation in the proportion of different morphs ( Toräng, Ehrlén & Ågren, 2006 ) can also modify the effects of plant height on its reproductive success.…”

Section: Introductionmentioning

confidence: 99%

Vertical stratification of plant–pollinator interactions in a temperate grassland

Klečka

Hadrava

Koloušková

2018

PeerJ

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Visitation of plants by different pollinators depends on individual plant traits, spatial context, and other factors. A neglected aspect of small-scale variation of plant–pollinator interactions is the role of vertical position of flowers. We conducted a series of experiments to study vertical stratification of plant–pollinator interactions in a dry grassland. We observed flower visitors on cut inflorescences of Centaurea scabiosa and Inula salicina placed at different heights above ground in two types of surrounding vegetation: short and tall. Even at such a small-scale, we detected significant shift in total visitation rate of inflorescences in response to their vertical position. In short vegetation, inflorescences close to the ground were visited more frequently, while in tall vegetation, inflorescences placed higher received more visits. Moreover, we found major differences in the composition of the pollinator community on flowers at different heights. In a second experiment, we measured flower visitation rate in inflorescences of Salvia verticillata of variable height. Total flower visitation rate increased markedly with inflorescence height in this case. Data on seed set of individual plants provide evidence for a corresponding positive pollinator-mediated selection on increased inflorescence height. Overall, our results demonstrate strong vertical stratification of plant–pollinator interactions at the scale of mere decimetres. This may have important ecological as well as evolutionary implications.

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“…Many studies have shown that the reproductive success of individual plants may decrease in response to increasing NND or decreasing LNS due to pollen limitation (Allison, [1990]; Roll et al [1997]; Jakobsson et al, [2009]; Caraballo-Ortiz et al, [2011]). Contrary to these studies, individual fruit set of C. agristis in our study increased in response to increasing NND and decreased with increasing LNS at the 0.1 m spatial scale, and these relationships remained even when individual plant size was accounted for.…”

Section: Discussionmentioning

confidence: 99%

Scale-dependent effects of habitat fragmentation on reproduction in the annual Circaeaster agristis, a narrow endemic and threatened species

et al. 2014

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BackgroundHabitat fragmentation and the resulting decline in population size and density commonly reduce the reproduction of rare and threatened species. We investigated the impacts of population size and density on reproduction in more than 30 populations of Circaeaster agristis, a narrow endemic and threatened species, in 2010 and 2011. We also examined the effects of NND (nearest neighbor distance) and LNS (local neighbor size), within radii of 0.1 m, 0.2 m and 0.3 m, on reproduction in two of the populations in 2011.ResultsPopulation size did not affect fruit (seed) number and fruit set in either year studied. Population density had an indirect negative effect on fruit number and fruit set as a consequence of a negative effect on plant size in 2010, but had no effect on fruit number and fruit set in 2011. Within populations, individual fruit number did not change, and individual fruit set increased independent of plant size, in response to increasing NND. Both individual fruit number and individual fruit set increased, independent of plant size, with increases in LNS within a 0.1 m radius, but did not change with increases in LNS within radii of between 0.1 m and 0.2 m radii or between 0.2 m and 0.3 m.ConclusionsThe effect of habitat fragmentation on reproduction of C. agristis is scale-dependent. In contrast to the generally accepted idea that fragmentation reduces plant reproduction, reproductive success may increase in sparse populations or increase in response to decreases in LNS in C. agristis.Electronic supplementary materialThe online version of this article (doi:10.1186/s40529-015-0095-5) contains supplementary material, which is available to authorized users.

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Flower number and distance to neighbours affect the fecundity of Goetzea elegans (Solanaceae)

Cited by 16 publications

References 46 publications

Fine-scale processes shape ecosystem service provision by an Amazonian hyperdominant tree species

Fine-scale processes shape ecosystem service provision by an Amazonian hyperdominant tree species

Vertical stratification of plant–pollinator interactions in a temperate grassland

Scale-dependent effects of habitat fragmentation on reproduction in the annual Circaeaster agristis, a narrow endemic and threatened species

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