Search results for "luu"

Kalmbergin kartasto R IV : List 3

1855

Kalmbergin kartasto R IV : List 4

1855

Kalmbergin kartasto R V : List 3

1855

Maahanmuuttajien kotoutumiskokemukset Etelä-Pohjanmaan maaseutumaisille alueille

2012

Artikkeli tarkastelee maaseutumaisella alueella asuvien maahanmuuttajien kotoutumista useiden eri tekijöiden kautta. Tutkimuksessa on hyödynnetty sekä kvantitatiivista postikyselyä että kvalitatiivista teemahaastattelua. Kotoutumisesta piirtyvä kuva näyttää useimpien maahanmuuttajien kohdalla myönteiseltä. Erityisesti virolaisten tilanne on selvästi muita valoisampi: heidän suomen kielen taitonsa on muita ryhmiä parempi, ja he ovat työllistyneet ja onnistuneet vakauttamaan työmarkkina-asemaansa muita ryhmiä paremmin. Lisäksi heidän sosiaaliset verkostonsa ovat venäläisiin verrattuna monipuolisemmat. Virolaiset myös tuntevat olonsa muita ryhmiä useammin kotoisaksi Etelä-Pohjanmaalla. Venäläi…

Sex-specific responses to cold in a very cold-tolerant, northern Drosophila species

2021

Funding: This work was supported by Academy of Finland projects 268214 and 322980 to MK and a NERC (UK) grant NE/P000592/1 to MGR. Organisms can plastically alter resource allocation in response to changing environmental factors. For example, in harsh conditions, organisms are expected to shift investment from reproduction toward survival; however, the factors and mechanisms that govern the magnitude of such shifts are relatively poorly studied. Here we compared the impact of cold on males and females of the highly cold-tolerant species Drosophila montana at the phenotypic and transcriptomic levels. Although both sexes showed similar changes in cold tolerance and gene expression in response…

Coevolution of parental investment and sexually selected traits drives sex-role divergence

2016

Sex-role evolution theory attempts to explain the origin and direction of male–female differences. A fundamental question is why anisogamy, the difference in gamete size that defines the sexes, has repeatedly led to large differences in subsequent parental care. Here we construct models to confirm predictions that individuals benefit less from caring when they face stronger sexual selection and/or lower certainty of parentage. However, we overturn the widely cited claim that a negative feedback between the operational sex ratio and the opportunity cost of care selects for egalitarian sex roles. We further argue that our model does not predict any effect of the adult sex ratio (ASR) that is …

Natural selection mediated by seasonal time constraints increases the alignment between evolvability and developmental plasticity

2021

Abstract Phenotypic plasticity can either hinder or promote adaptation to novel environments. Recent studies that have quantified alignments between plasticity, genetic variation, and divergence propose that such alignments may reflect constraints that bias future evolutionary trajectories. Here, we emphasize that such alignments may themselves be a result of natural selection and do not necessarily indicate constraints on adaptation. We estimated developmental plasticity and broad sense genetic covariance matrices (G) among damselfly populations situated along a latitudinal gradient in Europe. Damselflies were reared at photoperiod treatments that simulated the seasonal time constraints ex…

Sex roles and the evolution of parental care specialization

2019

Males and females are defined by the relative size of their gametes (anisogamy), but secondary sexual dimorphism in fertilization, parental investment and mating competition is widespread and often remarkably stable over evolutionary timescales. Recent theory has clarified the causal connections between anisogamy and the most prevalent differences between the sexes, but deviations from these patterns remain poorly understood. Here, we study how sex differences in parental investment and mating competition coevolve with parental care specialization. Parental investment often consists of two or more distinct activities (e.g. provisioning and defence) and parents may care more efficiently by s…

Associations of physical activity intensities, impact intensities and osteogenic index with proximal femur bone traits among sedentary older adults

2021

Background Dynamic high-intensity physical activity is thought to be beneficial for older adults’ bone health. Traditional volume-based processing of accelerometer-measured physical activity data, quantified on a minute-per-minute basis, may average out sporadic high impact activity, whereas accelerometer data processing approaches based on identifying impacts can capture also these potentially beneficial short activity bursts. We investigated the associations between habitual physical activity and proximal femur bone traits among sedentary older adults utilizing three different numerical treatments of accelerometer-data to examine, if impact-based processing approaches are more suitable to…

Physical function and lean body mass as predictors of bone loss after hip fracture: a prospective follow-up study

2020

Abstract Background: Predictors of bone deterioration after hip fracture have not been well characterized. The aim of this study was to examine the associations of physical function and lean body mass (LBM) with loss of bone density and strength in older people recovering from a hip fracture. Methods: A total of 81 over 60-year-old, community-dwelling men and women operated for a hip fracture participated in this 1-year prospective follow-up study. Distal tibia total volumetric bone mineral density (vBMDTOT, mg/cm³) and compressive strength index (BSI, g²/cm⁴) and mid-tibia cortical vBMD (vBMDCO, mg/cm³) and bending strength index (SSI, mm³) were assessed in both legs by peripheral quantita…