Results 51 to 60 of about 2,221,299 (300)

The evolution of self‐fertilization and inbreeding depression under pollen discounting and pollen limitation [PDF]

open access: yesJournal of Evolutionary Biology, 2005
AbstractWe model the evolution of plant mating systems under the joint effects of pollen discounting and pollen limitation, using a dynamic model of inbreeding depression, allowing for partial purging of recessive lethal mutations by selfing. Stable mixed mating systems occur for a wide range of parameter values with pollen discounting alone.
E, Porcher, R, Lande
openaire   +2 more sources

The neonicotinoid insecticide Imidacloprid repels pollinating flies and beetles at field-realistic concentrations [PDF]

open access: yes, 2013
Neonicotinoids are widely used systemic insecticides which, when applied to flowering crops, are translocated to the nectar and pollen where they may impact upon pollinators.
Amy H. Easton   +22 more
core   +12 more sources

Atmospheric dispersion of airborne pollen evidenced by near-surface and columnar measurements in Barcelona, Spain [PDF]

open access: yes, 2016
Hourly measurements of pollen near-surface concentration and lidar-derived profiles of particle backscatter coefficients and of volume and particle depolarization ratios during a 5-day pollination event observed in Barcelona, Spain, between 27 – 31 March,
Alarcón Jordán, Marta   +7 more
core   +1 more source

Coexistence induced by pollen limitation in flowering-plant species [PDF]

open access: yesProceedings of the Royal Society of London. Series B: Biological Sciences, 2001
We report a novel mechanism for species coexistence that does not invoke a trade-off relationship in the case of outbreeding flowering plants. Competition for pollination services may lead to interspecific segregation of the timing of flowering among plants. This, in turn, sets limits on the pollination services, which restrain the population growth of
R, Ishii, M, Higashi
openaire   +2 more sources

Duodichogamy and androdioecy in the Chinese Phyllanthaceae Bridelia tomentosa [PDF]

open access: yes, 2007
Flowering plants commonly separate male and female function in time, but rarely are the two stages synchronized within and among individuals. One such temporal mating system is duodichogamy in which each plant produces two batches of male flowers that ...
Luo, Shixiao   +2 more
core   +1 more source

Uniform female-biased sex ratios in alpine willows [PDF]

open access: yes, 2012
Premise of the study: The development of biased sex ratios in dioecious plant species has been ascribed to either (1) factors influencing differential adult mortality of male and female plants or (2) factors acting at an early life stage that determine ...
Hik, David S., Myers-Smith, Isla H.
core   +1 more source

Reproductive ecology and severe pollen limitation in the polychromic tundra plant, Parrya nudicaulis (Brassicaceae).

open access: yesPLoS ONE, 2012
Pollen limitation is predicted to be particularly severe in tundra habitats. Numerous reproductive patterns associated with alpine and arctic species, particularly mechanisms associated with reproductive assurance, are suggested to be driven by high ...
Justin R Fulkerson   +2 more
doaj   +1 more source

The effect of experimental pollinator decline on pollinator‐mediated selection on floral traits

open access: yesEcology and Evolution, 2023
Human‐mediated environmental change, by reducing mean fitness, is hypothesized to strengthen selection on traits that mediate interactions among species.
Kaitlyn S. Brown, Christina M. Caruso
doaj   +1 more source

Extremely long-lived stigmas allow extended cross-pollination opportunities in a high Andean plant. [PDF]

open access: yesPLoS ONE, 2011
High-elevation ecosystems are traditionally viewed as environments in which predominantly autogamous breeding systems should be selected because of the limited pollinator availability.
Cristian Torres-Díaz   +6 more
doaj   +1 more source

Chronologies for Recent Peat Deposits Using Wiggle-matched Radiocarbon Ages: Problems with Old Carbon Contamination [PDF]

open access: yes, 2005
Dating sediments which have accumulated over the last few hundred years is critical to the calibration of longer-term paleoclimate records with instrumental climate data.
Charman, D.J., Garnett, M.H.
core   +1 more source

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