Search results for "Ranta"

Do the ecological drivers of lake littoral communities match and lead to congruence between organism groups?

2020

AbstractLake littoral environments are heterogeneous, and different organisms typically show specific responses to this environmental variation. We examined local environmental and spatial factors affecting lake littoral biodiversity and the structuring of assemblages of phytoplankton, zooplankton and macroinvertebrates within and among three basins of a large lake system. We explored congruence of species composition and species richness among the studied organism groups to evaluate their general indicator potential to represent spatial variation in other groups. We expected that effects of water chemistry on plankton assemblages were stronger than effects of habitat characteristics. In co…

Cost-efficiency assessments of marine monitoring methods lack rigor—a systematic mapping of literature and an end-user view on optimal cost-efficienc…

2021

Global deterioration of marine ecosystems, together with increasing pressure to use them, has created a demand for new, more efficient and cost-efficient monitoring tools that enable assessing changes in the status of marine ecosystems. However, demonstrating the cost-efficiency of a monitoring method is not straightforward as there are no generally applicable guidelines. Our study provides a systematic literature mapping of methods and criteria that have been proposed or used since the year 2000 to evaluate the cost-efficiency of marine monitoring methods. We aimed to investigate these methods but discovered that examples of actual cost-efficiency assessments in literature were rare, contr…

‘False resupination’ in the flower-pairs of Thalia (Marantaceae)

2016

Abstract Resupination, i.e., the turn by 180°, arranges zygomorphic flowers in a suitable position for pollination. It is well-known from orchids, but also occurs in further angiosperm families. Within the genus Thalia L. (Marantaceae), T. dealbata has erect and T. geniculata pendulous inflorescences. Nevertheless, in both species the zygomorphic flower-pairs show the right position for pollination. Thus, resupination is expected in Marantaceae. To reconstruct spatial arrangement, flower development was investigated from meristem formation to anthesis. Early morphogenetic stages were analysed under the scanning electron microscope, late stages were documented by time-lapse records. Gravity …

Social dominance correlates and family status in wintering dark-bellied brent geese Branta bernicla bernicla

2006

International audience; In many gregarious species, including ducks and geese, being dominant provides more benefits than costs, because dominants have better access to resources essential for survival or reproduction. In geese, being in better body condition during migration towards the breeding grounds positively influences reproductive success. However, underlying proximate mechanisms linking prebreeding body condition on the wintering grounds to breeding success remain poorly understood. We investigated social dominance correlates and family status, in three consecutive winters, in a free-ranging, migrating, dark-bellied brent goose population. Families with juveniles dominated pairs, a…

Vascular bundle modifications in nodes and internodes of climbing Marantaceae

2020

AbstractNodes are interfaces between stems and leaves. Vascular bundles originate here and elongate into leaves and internodes. In Marantaceae, internodal bundles are highly diverse, including inverted bundles in the climbing genus Haumania. The objective of this paper is to characterize bundle forms, their position across the stem and their connection to leaves and short shoots in Haumania spp. and other unrelated African branch-angle climbers in the family (Hypselodelphys, Trachyphrynium). We question whether bundle inversion is a genus-specific trait in Haumania or related to the climbing growth form. Vascular bundles in internodes are scattered across the stem diameter in a characterist…

Lakes in the era of global change: moving beyond single‐lake thinking in maintaining biodiversity and ecosystem services

2020

The Anthropocene presents formidable threats to freshwater ecosystems. Lakes are especially vulnerable and important at the same time. They cover only a small area worldwide but harbour high levels of biodiversity and contribute disproportionately to ecosystem services. Lakes differ with respect to their general type (e.g. land-locked, drainage, floodplain and large lakes) and position in the landscape (e.g. highland versus lowland lakes), which contribute to the dynamics of these systems. Lakes should be generally viewed as ‘meta-systems’, whereby biodiversity is strongly affected by species dispersal, and ecosystem dynamics are contributed by the flow of matter and substances among locati…

2018

This study aims to identify the histological basis for the extraordinary, fast movement of the style in Marantaceae. Although this explosive pollination mechanism was subject of many studies, quantitative measurements to document volumetric changes have never been conducted. Based on physical parameters and limitations (poroelastic time), the movement itself is by far too fast to be explained by turgor changes solely. Therefore, we address the hypothesis that the style contains elastic structures to store energy allowing the fast movement. We provide an experimental approach in Goeppertia bachemiana to identify histological differences of styles in various states, i.e., steady, unreleased, …

How do people talk decades later about their crisis that we call psychosis? : A qualitative study of the personal meaning-making process

2019

Psychosis refers to a severe mental state that often significantly affects the individual’s life course. However, it remains unclear how people with the lived experiences themselves view these phenomena, as part of their life story. In order to evaluate this personal meaning-making process, we conducted in-depth life-story interviews with 20 people who had been diagnosed with non-affective psychosis 10 to 23 years previously in one catchment area. 35% of them were still receiving mental health treatment, and 55% of them were diagnosed with schizophrenia. Only a minority named their experiences as psychosis. On the basis of narrative analysis, two types of stories appeared to encompass how m…

Ajatuksella ja ahkeruudella kolmen suvun vaiheista neljältä vuosisadalta

2018

Kirja-arvio teoksesta Immonen, Perttu: Suomen rahvaan historia. Kolmen suvun elämää keskiajalta 1800-luvulle. Atena Kustannus Oy, 2017. 639 sivua. ISBN 978- 952-300-335-4. Perttu Immonen yhdistää teoksessaan mielenkiintoisesti ja elävästi mikro- ja makrohistorian varhaismodernin ajan Suomessa. Hän seuraa kronologisesti kolmen eri seutukunnan: LänsiSuomen Sastamalan, Itä-Suomen Rantasalmen ja Pohjanmaan Kokkolan tapahtumia. Poikkeuksellisen ankarien aikojen kuvauksesta muodostuu moniulotteinen ja alueiden erilaisia kohtaloita tarkasteleva analyysi. nonPeerReviewed

Villimiehen arkivaatteet : Lappeenrannan keskusta-alueen suunnittelu ja muutos vuosina 1956-1980

2014

Toisen maailmansodan jälkeiset modernisaation vuosikymmenet jättivät jäljen suomalaiseen kaupunkimaisemaan, kun vanhat puutalokaupungit ympäri Suomea rakennettiin uudelleen. Nopean rakentamisen vuosina standardisoitu elementtirakentaminen korvasi kaupunkien paikalliseen rakennusperinteeseen perustuneen rakennuskannan, minkä tuloksena kaupunkikeskustat ympäri Suomen alkoivat muistuttaa toisiaan. Tässä Suomen historian Pro gradu -työssä tarkastellaan Lappeenrannan keskustan kaupunkisuunnittelua ja muutosta vuosina 1956–1980. Tutkimuksen alkuperäislähteinä on käytetty Lappeenrannan kaupunginvaltuuston pöytäkirjoja, paikallista sanomalehteä Etelä-Saimaata sekä kaupungin keskustaa koskevia kaupu…