Search results for "pölytys"

Honeybees affect floral microbiome composition in a central food source for wild pollinators in boreal ecosystems

2021

AbstractBasic knowledge on dispersal of microbes in pollinator networks is essential for plant, insect, and microbial ecology. Thorough understanding of the ecological consequences of honeybee farming on these complex plant–pollinator–microbe interactions is a prerequisite for sustainable honeybee keeping. Most research on plant–pollinator–microbe interactions have focused on temperate agricultural systems. Therefore, information on a wild plant that is a seasonal bottleneck for pollinators in cold climate such as Salix phylicifolia is of specific importance. We investigated how floral visitation by insects influences the community structure of bacteria and fungi in Salix phylicifolia inflo…

The role of geitonogamy in the reproduction success of a nectarless dactylorhiza maculata (orchidaceae)

2011

Dactylorhiza maculata is a common terrestrial orchid in Finland. It is nectarless and the seed production is relatively high for a deceptive species. The pollinators of D. maculata do not have frequent visits to the flowers, but the species is capable of over 50 % seed capsule production. Geitonogamy is the transfer of self pollen between flowers on the same individual. It is typical that the pollinators of deceptive inflorescences visit only few flowers and have short stays in them, and therefore it is commonly thought that geitonogamy is infrequent among deceptive species. I examined the role of geitonogamy in the seed production of D. maculata. I prevented geitonogamy in male-sterilizati…

Prolonged stigma and flower lifespan in females of the gynodioecious plant Geranium sylvaticum

2017

In gynodioecious plants females need a reproductive advantage over hermaphrodites to be maintained in the same population. Generally, three main proximate causes for a female advantage are considered: inbreeding avoidance, different resource allocation patterns, and differences in ecological interactions. A mechanism potentially causing a female advantage that is rarely discussed is a difference in floral longevity between the genders. Females may have a longer stigma lifespan than hermaphrodites, which can affect pollination. Stigma and flower lifespan are rarely documented in gynodioecious species, although it is a common observation in dioecious species that female plants flower longer t…

The interplay of landscape composition and configuration: new pathways to manage functional biodiversity and agroecosystem services across Europe

2019

Managing agricultural landscapes to support biodiversity and ecosystem services is a key aim of a sustainable agriculture. However, how the spatial arrangement of crop fields and other habitats in landscapes impacts arthropods and their functions is poorly known. Synthesising data from 49 studies (1515 landscapes) across Europe, we examined effects of landscape composition (% habitats) and configuration (edge density) on arthropods in fields and their margins, pest control, pollination and yields. Configuration effects interacted with the proportions of crop and non-crop habitats, and species’ dietary, dispersal and overwintering traits led to contrasting responses to landscape variables. O…

Raatteen (Menyanthes trifoliata) kärkikukan poikkeuksellinen avautumisajankohta - viesti pölyttäjille kukinnon houkuttelevuuden huipusta?

2006

Geranium sylvaticum increases pollination probability by sexually dimorphic flowers

2022

Sexual dimorphism is expressed as different morphologies between the sexes of a species. Dimorphism is pronounced in gynodioecious populations which consist of female and hermaphrodite individuals. The small size of female flowers in gynodioecious species is often explained by resource re-allocation to seed production instead of large flowers. However, pollinator attraction is critical to female fitness, and factors other than resource savings are needed to explain the small size of female flowers. We hypothesized that the floral size dimorphism in the perennial gynodioecious Geranium sylvaticum (L.) is adaptive in terms of pollination. To test this “pollination hypothesis,” we video record…

Haitallisen vieraslajin komealupiinin (Lupinus polyphyllus Lind.) ja alkuperäislaji hiirenvirnan (Vicia cracca L.) välinen kilpailu pölyttäjistä

2011

Kilpailu vaikuttaa usein haitallisesti yksilöiden elossa säilymiseen, lisääntymiseen ja kas-vuun ja tätä kautta myös lajien populaatiodynamiikkaan, eliöyhteisöjen rakenteeseen ja evoluutioon. Lajien välisessä resurssikilpailussa kilpailun vaikutus välittyy muihin lajeihin epäsuorasti ympäristön resurssien runsauden kautta. Lajien välinen kilpailu voi olla hel-pommin havaittavaa vieras- ja alkuperäislajien välillä kuin alkuperäislajien välillä, sillä vieras- ja alkuperäislajeilla ei ole yhteistä evolutiivista historiaa, eikä siten adaptaatioita keskinäisiin vuorovaikutuksiin, kuten kilpailun välttämiseen. Vieraslajikasvit voivat kil-pailla alkuperäislajien kanssa pölyttäjistä, jolloin alkupe…

Geranium sylvaticum video recording data

2022

Dataset consists of three sheets. Insect visits data is the main data with insect visitors per visitor group, and their reproductive organ contacts during each visit. Seed data is the data of count seeds of the study plants. Visitation rate is the data on the number of visits per flower per hour by different visitor groups.