نتایج جستجو برای: visitation time
تعداد نتایج: 1892986 فیلتر نتایج به سال:
BACKGROUND AND AIMS This study examined the effect of plant traits and environmental factors on pollinator visitation in the winter-flowering Helleborus foetidus (Ranunculaceae) in three distant regions in the Iberian Peninsula. METHODS Geographical variation in floral visitor assemblage, plant traits and environmental factors were analysed during the flowering season. KEY RESULTS Differenc...
BACKGROUND AND AIMS Floral rewards may be associated with certain morphological floral traits and thus act as underlying factors promoting selection on these traits. This study investigates whether some traits that are under pollinator-mediated selection (flower number, stalk height, corolla diameter, corolla tube length and corolla tube width) in the Mediterranean herb E. mediohispanicum (Bras...
BACKGROUND Young children with sickle cell disease (SCD) are at risk for cognitive delay. In addition to biologic risk factors associated with SCD, environmental factors contribute to cognitive dysfunction within this cohort. METHODS We completed a single-arm, prospective cohort study. Children with SCD between the ages of 3 and 36 months and their caregivers were followed between October 201...
The component Allee effect has been defined as 'a positive relationship between any measure of individual fitness and the number or density of conspecifics'. Larger plant populations or large patches have shown a higher pollinator visitation rate, which may give rise to an Allee effect in reproduction of the plants. We experimentally tested the effect of number of conspecifics on reproduction a...
OBJECTIVES The objectives of this study were to determine the rate of use of dental services by independently living older dentate and edentulous adults and the factors affecting utilization. METHODS Data were derived from the cross-sectional Manitoba Study of Health and Aging. A personal interview included over 240 questions addressing sociodemographics, well-being, oral and general health, ...
The parameters of legal visitation rights for grandparents in both biological and adoptive parenting situations are explored. Laws in each of the 50 states and the District of Columbia are summarized. Suggestions for improvement in the current system are included.
1. Olds D, Henderson CR, Cole R, et al. Long-term effects of nurse home visitation on children’s criminal and antisocial behavior: 15-year follow-up of a randomized controlled trial. JAMA. 1998;280:1238-1244. 2. The Infant Health Development Program. Enhancing the outcomes of low birth weight, premature infants: a multisite, randomized trial. JAMA. 1990;263:3035-3042. 3. Brooks-Gunn J, McCarton...
Animal pollination is essential for the reproductive success of many wild and crop plants. Loss and isolation of (semi-)natural habitats in agricultural landscapes can cause declines of plants and pollinators and endanger pollination services. We investigated the independent effects of these drivers on pollination of young cherry trees in a landscape-scale experiment. We included (i) isolation ...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید