Search results for "Ekologi"

Vertailutilalla on väliä

2017

Sukellus Ekokylään : ekologista ja sosiaalista kestävyyttä etsimässä

1999

Context dependent variation in corticosterone and phenotypic divergence of Rana arvalis populations along an acidification gradient

2022

Background Physiological processes, as immediate responses to the environment, are important mechanisms of phenotypic plasticity and can influence evolution at ecological time scales. In stressful environments, physiological stress responses of individuals are initiated and integrated via the release of hormones, such as corticosterone (CORT). In vertebrates, CORT influences energy metabolism and resource allocation to multiple fitness traits (e.g. growth and morphology) and can be an important mediator of rapid adaptation to environmental stress, such as acidification. The moor frog, Rana arvalis, shows adaptive divergence in larval life-histories and predator defense traits along an acidi…

Idiosyncratic responses to simulated herbivory by root fungal symbionts in a subarctic meadow

2021

Plant-associated fungi have elementary roles in ecosystem productivity. There is little information on the interactions between arbuscular mycorrhizal (AM) fungal symbiosis, fine endophytic (FE) and dark septate endophytic (DSE) fungi, and their host plants in cold climate systems. In particular, the environmental filters potentially driving the relative abundance of these root symbionts remain unknown. We investigated the interlinkage of plant and belowground fungal responses to simulated herbivory (clipping, fertilization, and trampling) in a subarctic meadow system. AM and FE frequency in the two target plant roots, Potentilla crantzii and Saussurea alpina, was unaffected by simulated he…

Toward Comprehensive Plant Microbiome Research

2020

Microbes have driven eco-evolutionary adaptations organizing biodiversity from the origin of life. They are ubiquitous and abundant, facilitating the biochemical processes that make Earth habitable and shape ecosystem structures, functions, and services. Recent studies reveal that commensalistic and beneficial microbes associated with wild and domesticated plants may aid in establishing sustainable agriculture for a changing climate. However, developing microbe-based biotechnologies and ecosystem services requires a thorough understanding of the diversity and complexity of microbial interactions with each other and with higher organisms. We discuss the hot and blind spots in contemporary re…

Biotic homogenization of forest bird communities under human influence

2018

Human actions impact biodiversity worldwide. Specialist species are particularly sensitive to environmental degradation whereas generalists may even benefit from habitat changes. As a consequence, specialists are declining while generalists are increasing and, therefore, communities become more similar. This phenomenon is known as biotic homogenization. In boreal forests logging and forest management is the most important factor changing the native habitat. In this thesis I studied if human actions are homogenizing boreal forest bird communities. I further studied if protected areas can maintain their diversity and, thus, prevent homogenization. Through the individual studies, biodiversity …

Distance decay 2.0. A global synthesis of taxonomic and functional turnover in ecological communities

2022

Caio Graco-Roza was funded by the Coordination for the Improvement of Higher Education Personnel (CAPES), the Carlos Chagas Filho Research Support Foundation (FAPERJ) and the Ella and Georg Erhnrooth Foundation; Jan Altman by research grants INTER-EXCELLENCE LTAUSA19137 provided by Czech Ministry of Education, Youth and Sports, 20-05840Y of the Czech Science Foundation, and long-term research development project no. RVO 67985939 of the Czech Academy of Sciences; Otso Ovaskainen was funded by Academy of Finland (grant no. 309581), Jane and Aatos Erkko Foundation, Research Council of Norway through its Centres of Excellence Funding Scheme (223257), and the European Research Council (ERC) unde…

Ongelmallisesta oleskelijasta kesyksi esyksi? : oppilaiden ja vanhempien käsityksiä ongelmallisen käyttäytymisen syistä, esy-siirrosta ja opiskelusta…

2001

Nuoren sosiaalinen sopeutumattomuus : tapaustutkimus

1998

Muistisairaan ihmisen kokemukset teknologiasta osana arkea - turvaa vai tunkeilevuutta

2018

Tässä tutkimuksessa selvitettiin muistisairaiden ihmisten arkea tukevan teknologian käyttöönottoa ja heidän sekä heidän läheistensä kokemuksia teknologian käytöstä. Tutkimuksen viitekehyksenä toimi Lawtonin ekologinen malli. Tutkimuksessa käytettiin etnografista näkökulmaa haastattelemalla ja havainnoimalla muistisairaita ihmisiä teknologian käyttötilanteissa. Ensimmäinen vaihe toteutettiin vuosina 2004-2007. Ensimmäisessä vaiheessa kohderyhmänä olivat 25 muistisairautta sairastavaa kotona yksin tai omaishoitajansa kanssa asuvaa henkilöä sekä heidän läheistään ja viisi vastaajaa kuntien kotihoidosta. Koteihin vietiin yhteensä 29 erilaista laitetta. Toinen keruuvaihe toteutettiin vuosina 201…