نتایج جستجو برای: pollination

تعداد نتایج: 6767  

2015

1. Pollination by insects is a vital ecosystem service and the need for its assessment is increasing in recognition and political pressure, but there are currently no large-scale systematic monitoring schemes in place to measure the direct provision of this service. 2. This study tested a protocol for using a citizen science approach to quantify pollination service provision in gardens and allo...

Journal: :Systematic botany 2015
Shayla Salzman Heather E Driscoll Tanya Renner Thiago André Stacy Shen Chelsea D Specht

Rapid radiations are notoriously difficult to resolve, yet understanding phylogenetic patterns in such lineages can be useful for investigating evolutionary processes associated with bursts of speciation and morphological diversification. Here we present an expansive molecular phylogeny of Costus L. (Costaceae Nakai) with a focus on the Neotropical species within the clade, sampling 47 of the k...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2002
Claire Kremen Neal M Williams Robbin W Thorp

Ecosystem services are critical to human survival; in selected cases, maintaining these services provides a powerful argument for conserving biodiversity. Yet, the ecological and economic underpinnings of most services are poorly understood, impeding their conservation and management. For centuries, farmers have imported colonies of European honey bees (Apis mellifera) to fields and orchards fo...

2010
Mary V. Ashley

DNA microsatellites provide plant ecologists with molecular markers precise enough to assign parentage to seeds and seedlings. This allows the exact distance and trajectory of successful pollen to be traced to characterize pollination patterns. Parentage assignment of established seedlings also allows researchers to accurately determine how far new recruits have traveled from their seed parent....

2010
Lin Zhu Anru Lou

Aims Rhodiola dumulosa is a perennial herb growing in a naturally fragmented habitat of high-mountain rocks. This research aims to (i) investigate the mating system characteristics and pollination biology of R. dumulosa, (ii) study the effects of ecological factors on the mating system and pollination biology of R. dumulosa and (iii) assess the relationship between its pollination and mating sy...

2006
Roland Olschewski Teja Tscharntke Pablo C. Benítez Stefan Schwarze Alexandra-Maria Klein

Biodiversity conservation through land-use systems on private land is becoming a pressing environmental policy issue. Agroforestry, such as shade-coffee production, contributes to biodiversity conservation. However, falling coffee prices force many coffee growers to convert their sites into economically more attractive land uses. We performed an economic evaluation of coffee pollination by bees...

2016
Panagiotis Theodorou Rita Radzevičiūtė Josef Settele Oliver Schweiger Tomás E Murray Robert J Paxton

Animal-mediated pollination is required for the reproduction of the majority of angiosperms, and pollinators are therefore essential for ecosystem functioning and the economy. Two major threats to insect pollinators are anthropogenic land-use change and the spread of pathogens, whose effects may interact to impact pollination. Here, we investigated the relative effects on the ecosystem service ...

Journal: :American journal of botany 2006
Regina Berjano Clara de Vega Montserrat Arista Pedro L Ortiz Salvador Talavera

Pollen limitation, resource limitation, fruit abortion, and predation have all been proposed as factors explaining low fruit set in hermaphroditic plants. We conducted a 5-year study combining field observations and pollination experiments to determine the causes of the low fruit set in Aristolochia paucinervis, a Mediterranean species with a specialized pollination system in two populations in...

Journal: :Annals of botany 2009
Randall J Mitchell Rebecca E Irwin Rebecca J Flanagan Jeffrey D Karron

BACKGROUND Some of the most exciting advances in pollination biology have resulted from interdisciplinary research combining ecological and evolutionary perspectives. For example, these two approaches have been essential for understanding the functional ecology of floral traits, the dynamics of pollen transport, competition for pollinator services, and patterns of specialization and generalizat...

Journal: :The American naturalist 2016
Samuel Venner Aurélie Siberchicot Pierre-François Pélisson Eliane Schermer Marie-Claude Bel-Venner Manuel Nicolas François Débias Vincent Miele Sandrine Sauzet Vincent Boulanger Sylvain Delzon

Masting, a breeding strategy common in perennial plants, is defined by seed production that is highly variable over years and synchronized at the population level. Resource budget models (RBMs) proposed that masting relies on two processes: (i) the depletion of plant reserves following high fruiting levels, which leads to marked temporal fluctuations in fruiting; and (ii) outcross pollination t...

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