Search results for "Population"

Growth and population structure of perch in relation to diet in a small humic lake, Valkea-Kotinen

2011

Lake Valkea-Kotinen is a long-term ecological monitoring site in the Evo region of southern Finland .The aim of this study was to investigate the growth and population structure of perch (Perca fluviatilis L.) in relation to diet in Valkea-Kotinen in order to provide reference data for a study investigating effects of increased loading of dissolved organic matter to nearby Lake Alinen Mustajärvi. Valkea-Kotinen was predominantly inhabited by small benthivorous perch. The growth relationship between opercular bone and total length of perch in the lake is similar to those earlier analysed for nearby lakes. Compared to wider growth rates, the growth of perch was slow and similar to those in si…

Literacy, Age and Recentness of Education Among Nordic Adults

2017

The purpose of the present study was to examine the relationship between reading literacy and age in an adult population aged 25 to 65 in Nordic countries using PIAAC 2012 data. More specifically, the study examined to what extent variations in the literacy proficiency of adults are explained by age and the recentness of qualifications when variables related to education, occupation, and skill use are controlled. The statistical method was regression analysis. The recentness of education explained only a part of the performance gap between the oldest adults and others. The significance of the length and scope of initial education in developing literacy proficiency overall, is difficult to c…

Measuring, comparing and interpreting phenotypic selection on floral scent

2022

Natural selection on floral scent composition is a key element of the hypothesis that pollinators and other floral visitors drive scent evolution. The measure of such selection is complicated by the high-dimensional nature of floral scent data and uncertainty about the cognitive processes involved in scent-mediated communication. We use dimension reduction through reduced-rank regression to jointly estimate a scent composite trait under selection and the strength of selection acting on this trait. To assess and compare variation in selection on scent across species, time and space, we reanalyse 22 datasets on six species from four previous studies. The results agreed qualitatively with prev…

Darbaspēka migrācijas process: Ukrainas un Latvijas situācijas analīze

2019

Diplomdarba nosaukums: „ Darbaspēka migrācijas process: Ukrainas un Latvijas situācijas analīze”. Par minētā darba mērķi kalpo noteikta darba migrācijas iemesli uz populārākajām darba nozarēm priekš migrācijas no Ukrainas un Latviju. Pirmā darba daļa saistīta ar teoriju, noteiktu un klasificētu darbaspēka vērtības migrāciju, kā arī par migrācijas galveno iemeslu un valdības lomu migrācijā, kā arī par galveno iedzīvotāju kritēriju valsts izvēlē priekš darba migrācijas. Otrajā daļā tiek aprakstīta migrācijas un migrantu statistika Latvijā un Ukrainā, kā arī migrācijas politika ES trešajām valstīm. Un beidzot trešajā daļā analizējas ekspertu viedokļi un ukraiņu aptauja. Secinājumi un ieteikumi…

Le contrôle de la violence dans les villes au Moyen Âge

1992

International audience

Les musiciens et la musique dans les Mystères des villes de Bourgogne à la fin du Moyen Age

2003

dir. Georges Viard; International audience

Cris de haine et rites d'unité. La violence dans les villes, XIIIe-XVIe siècle

1992

International audience

Les médecins et la justice au XVe siècle à travers l'exemple dijonnais

1995

Data from: Daphnia invest in sexual reproduction when its relative costs are reduced

2018

The timing of sex in facultatively sexual organisms is critical to fitness, due to the differing demographic consequences of sexual vs. asexual reproduction. In addition to the costs of sex itself, an association of sex with the production of dormant life stages also influences the optimal use of sex, especially in environments where resting eggs are essential to survive unfavourable conditions. Here we document population dynamics and the occurrence of sexual reproduction in natural populations of Daphnia magna across their growing season. The frequency of sexually reproducing females and males increased with population density and with decreasing asexual clutch sizes. The frequency of sex…

Colonoscopic screening of first-degree relatives of patients with large adenomas: increased risk of colorectal tumors.

2007

International audience; Background & Aims: The risk of developing colorectal neoplasia is not well established among family members of individuals with large adenomas and screening strategies remain under debate in this population. This study aimed at quantifying the risk of colorectal adenomas and cancers using colonoscopic screening in first-degree relatives of patients with large adenomas. Methods: This case-control study was performed in 18 endoscopic units of French non-University Hospitals. A colonoscopy was offered to first-degree relatives of 306 index cases with adenomas ≥ 10 mm, if they were alive, aged 40-75 and could be contacted by the index case. Among 674 relatives meeting th…