نتایج جستجو برای: visitation state

تعداد نتایج: 859170  

2015
Michelle M. Cloutier James Wiley Zhu Wang Autherene Grant Amy A. Gorin

BACKGROUND Obesity is a major problem in the United States, particularly among socio-economically disadvantaged Latino and Black children. Effective interventions that can be disseminated to large numbers of at-risk children and their families are needed. The goals of the Early Childhood Obesity Prevention Program (ECHO) are to examine the 12-month efficacy of a primary obesity prevention progr...

2016
Jenny Veitch Jo Salmon Kate Parker Shaun Bangay Benedicte Deforche Anna Timperio

BACKGROUND The neighbourhood environment such as the availability of parks are a key, but under-researched, influence on adolescents' physical activity. In addition to overall physical activity levels, park-based physical activity and park visitation is low in this age group. Thus, it is critical to identify park features that may encourage or discourage adolescents from visiting parks. This st...

2017
Rubem Samuel de Avila Suiane Santos Oleques Brisa Marciniak José Ricardo I Ribeiro

The proportion of mimics and models is a key parameter in mimetic systems. In monoecious plants with self-mimicry pollination systems, the mimic-model ratio is determined by the floral sex ratio. While an equal sex ratio (1:1) could provide the perfect balance between pollen donors and stigma surfaces able to receive the pollen, an unequal ratio could increase pollination by production of a gre...

2006
Kimberly DuMont Susan Mitchell-Herzfeld Rose Greene Eunju Lee Ann Lowenfels Monica Rodriguez Joy Griffith Dorothy Baum John Heck Jeffrey Luks Kimberly A. DuMont

This paper evaluates early impacts of a home visiting program modeled after Healthy Families America on parenting behaviors in the first two years of life. It also proposes a framework for reconciling discrepant findings from randomized trials evaluating home visitation programs. A sample of 1173 families at risk for child abuse and neglect who met the criteria for Healthy Families New York (HF...

2005
MARY V. PRICE NICKOLAS M. WASER REBECCA E. IRWIN DIANE R. CAMPBELL ALISON K. BRODY

Pollination by animals is critical to sexual reproduction of most angiosperms. However, little is known about variation in pollination service to single plant species. We report results of a long-term study of Ipomopsis aggregata, a semelparous montane herb whose flowers are visited by hummingbird and insect pollinators as well as ‘‘floral larcenists.’’ We censused flower visitors over seven su...

2013
Adrian Davis Richard E. Major Charlotte E. Taylor

Urbanisation typically results in a reduction of hollow-bearing trees and an increase in the density of particularly species, potentially resulting in an increased level of competition as cavity-nesting species compete for a limited resource. To improve understanding of hollow usage between urban cavity-nesting species in Australia, particularly parrots, we investigated how the hollow-using ass...

2015
Katherine A. Orford Ian P. Vaughan Jane Memmott

Bees, hoverflies and butterflies are taxa frequently studied as pollinators in agricultural and conservation contexts. Although there are many records of non-syrphid Diptera visiting flowers, they are generally not regarded as important pollinators. We use data from 30 pollen-transport networks and 71 pollinator-visitation networks to compare the importance of various flower-visiting taxa as po...

Journal: :Environmental geochemistry and health 2014
Michael J Lavelle Gregory E Phillips Justin W Fischer Patrick W Burke Nathan W Seward Randal S Stahl Tracy A Nichols Bruce A Wunder Kurt C VerCauteren

Free-ranging cervids acquire most of their essential minerals through forage consumption, though occasionally seek other sources to account for seasonal mineral deficiencies. Mineral sources occur as natural geological deposits (i.e., licks) or as anthropogenic mineral supplements. In both scenarios, these sources commonly serve as focal sites for visitation. We monitored 11 licks in Rocky Moun...

Journal: :Annals of botany 2005
Alfonso M Sánchez-Lafuente Javier Guitián Mónica Medrano Carlos M Herrera Pedro J Rey Xim Cerdá

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...

Journal: :Annals of botany 2008
José M Gómez Jordi Bosch Francisco Perfectti J D Fernández Mohamed Abdelaziz J P M Camacho

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...

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