Search results for "Community"
showing 10 items of 2132 documents
Resources, recruitment limitation and invader species identity determine pattern of spontaneous invasion in experimental grasslands
2009
Summary 1 A number of experimental studies have supported the hypothesis that diversity increases invasion resistance, but several mechanisms were proposed to explain this relationship. We studied spontaneous invasion in experimental grasslands varying in species richness (1–16 (60)) and plant functional group richness and identity (1–4; grasses, legumes, tall herbs small herbs) during the first 3 years after establishment on large-area plots of 20 × 20 m size. 2 Invader species number, biomass and density decreased with increasing community species richness. The identity of successful invaders changed through time as the relative importance of external invaders (= species not belonging to …
Soil decomposer animal community in heavy-metal contaminated coniferous forest with and without liming
2002
Abstract Responses of decomposer animals to heavy-metal contamination were studied near a Cu–Ni smelter in Finland. Samples were taken 0.5, 2 and 8 km from the smelter. In addition, plots fertilised with lime were sampled. Decomposer community in coniferous forest soil appeared to be quite resistant to heavy-metals. Only in the vicinity (0.5 km) of the smelter, were numbers of soil animals clearly decreased and their community structure strongly altered as compared to the control site (8 km). At the 2-km site, the community structure was only slightly changed. Most of the collembolan species were still found at the 0.5-km site. High metal sorption capacity of the humus, and heterogeneous di…
Nested assemblages resulting from host size variation: the case of endoparasite communities in fish hosts
2001
Nested species subsets are a common pattern in many types of communities found in insular or fragmented habitats. Nestedness occurs in some communities of ectoparasites of fish, as does the exact opposite departure from random assembly, anti-nestedness. Here, we looked for nested and anti-nested patterns in the species composition of communities of internal parasites of 23 fish populations from two localities in Finland. We also compared various community parameters of nested and anti-nested assemblages of parasites, and determined whether nestedness may result simply from a size-related accumulation of parasite species by feeding fish hosts. Nested parasite communities were characterised b…
Long-Term Effects of Climate Warming on Forest Soil Collembola
2005
Long-term changes in the collembolan community structure were studied in a Scots pine forest in northern Latvia over a period of 11 successive years (1992–2002). Soil Collembola were yearly sampled from three pine forest stands of different age – young (30 to 40 years old), middle-aged (50 to 70 years old) and old (150 to 200 years old). During the study period a statistically significant increase in sums of positive temperatures (>+4°C) was recorded and a gradual decrease in species richness of Collembola was observed in all forest stands. The study showed that sums of positive air temperatures produce statistically significant effects on collembolan populations. Community responses were s…
We need to appreciate common synanthropic plants before they become rare: Case study in Latgale (Latvia)
2020
Local ecological knowledge holds great potential in contributing to sustainable resource management and conservation activities. For this reason, the authors choose to analyse an ethnobotanical dataset from the Baltic Sea region by exploring the relationship between plants and humans on the basis of three main categories: habitat characteristics, distribution in the wild and plant sensitivity to human impact beyond physical distance. The study provides empirical evidence of widespread usage of so-called common species which are widely distributed in the territory and benefit from human activity. When considering the data via the intensity of use, based on detailed use-reports (DUR), the mai…
Small Mammals in Forests of Romania: Habitat Type Use and Additive Diversity Partitioning
2021
Small mammals are key components of forest ecosystems, playing vital roles for numerous groups of forest organisms: they exert bottom-up and top-down regulatory effects on vertebrate and invertebrate populations, respectively
Unholy alliance or way of the future?
2021
This chapter observes how recent Finnish municipal and regional cultural strategies signify and value culture. On the basis of a thematic analysis of 21 strategies, I construct three main categories of their 'culture speech': the first is to approach culture as an instrument that unites different administrative sectors, on the one hand, and helps them to achieve extra-cultural – mostly social and economic – objectives, on the other. The second, is where culture is attached to individuals and communities and their expressions. It is also seen as an 'instrument' benefitting and serving them. The third, is economic. Culture is associated with the cultural and creative industries, and with econ…
Repercussions of Economic and Social Factors on Pension Systems
2013
Abstract Economic and social developments in recent years have left serious marks on pension systems. As forecasts for the following period are bleak, the need for uniting the efforts of public authorities with those of the business environment, research institutes and the academic community in order to identify viable solutions for both the present and the future, becomes increasingly obvious. Together they can identify remedies and contribute to the popularization of a problem whose consequences, once known, can be counteracted. The paper drafted, by studying the literature, confronts a number of common issues faced by pension systems in the current period and emphasizes the possibility o…
Political support for women entrepreneurs
2007
PurposeThe purpose of this paper is to analyze the application of EU programmes that seek to help women to set up their own businesses and discuss how public measures can help full integration of women into all walks of society, especially within jobs that correspond to their skills and capabilities.Design/methodology/approachAfter a literature review on the difficulties women face to find a suitable job, according to their preparation, their needs and their expectations, and the political considerations to act towards equality, this study is aimed at analyzing a European initiative designed to avoid gendered impacts on the present labour market. Through in‐depth interviews of project leade…
Paths of local development: Two technological districts face-to-face
2009
In this paper we compare the two hi-tech districts of Catania and Genoa, which are within the same national context and economic sector, with the aim of explaining their different choices (the promotion of external investments, in the first case, and fostering of the development of small businesses, in the second case) in the light of the local economic structure and the role played by political, economic, and educational institutions. Local actors have differently influenced the development of a professional community through the interpersonal networks of entrepreneurs and the performance obtained by local small businesses. While Catania has experienced a higher and more rapid growth, deve…