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CEMFOR SEMINAR – Aleksi Lehikoinen

Speaker: Aleksi Lehikoinen (University of Helsinki)

Title: : Abundance changes of birds in Europe: impact of climate, Maglie Portland Trail Blazers land use and life histories

Abstract: Climate change has suggested to shift species distribution areas towards north,

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  • but also other anthropogenic factors can influence population.

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  • In this presentation, Asics Gel Lyte 5 Pas Cher I show examples based on long-term monitoring how abundances of bird species have changed in relation to climate change, asics gel lyte 3 hombre azules species habitat preferences and human land use.

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  • In addition, nike air max flyknit hombre we have also investigated can protected areas mitigate impacts of climate change.

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  • Since many bird species are migratory it is important to investigate changes during both breeding and wintering season. nike air max 1 qs One of the strongest climate driven changes are the shifts in wintering abundances of waterbirds.

    CEMFOR SEMINAR – Quim Canelles

    Speaker: Quim Canelles (CTFC)

    Title: Parametrització de models dinàmics de vegetació a escala de paisatge

    Abstract: El model Medfire integra els principals processos paisatgístics que impulsen la dinàmica de paisatges a Catalunya en un context del canvi global. hogan outlet Inclou els principals factors de canvi de paisatge per estudiar les seves interaccions espai-temps: les pertorbacions naturals (principalment incendis), Air Jordan 10 les estratègies de gestió forestal,

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  • els processos d’aforestació i successió natural i el creixement de la massa forestal.

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  • En el seminari proposat, nike air max 1 ultra moire uomo intentaré resumir l’aproximació que hem fet a aquests procesos,

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  • la metodologia emprada,

    CEMFOR SEMINAR – Pablo Cruz

    Speaker: Pablo Cruz (Universidad Mayor de Chile).

    Subject: Exploring collaboration between CTFC and UMayor-Oterra

    OTERRA es un centro de estudios de recursos naturales perteneciente a la escuela de ingeniería forestal de la U. Nike KD Trey 5 III Mayor. Canotte Los Angeles Lakers Posee 9 investigadores tiempo completo, Air Jordan 11 (XI) laboratorios y equipos propios y sus actividades se financian con fondos externos a la Universidad,

    CEMFOR SEMINAR – Cyril Milleret

    Speaker: Cyril Milleret (Norwegian University of Life Sciences, Ås, Norway)

    Title: Wolf research in Scandinavia and population size estimation

    Abstract: Wolves have recolonized the Scandinavian peninsula (Norway and Sweden) in the early 1980’s and since then have considerably expanded their distribution range and population size. In order to coordinate wolf research in Norway and Sweden and answer specific management and conservation questions, the SKANDULV (Scandinavian wolf project) has been created in the 2000’s. Research topics involve many different aspects: wolf ecology, predatory behavior, predator and prey interactions, interspecific interactions, etc. Additionally, ROVQUANT, a new project aiming at estimating population size of wolves but also wolverines and brown bears in Scandinavia has been initiated early 2017. This new project aims at estimating density of large carnivores using spatially explicit mark recapture models in Scandinavia.

     

    CEMFOR SEMINAR – Carla Bellera /Aitor Améztegui (postponed)

    Speakers: Carla Bellera (CTFC) & Aitor Ameztegui (CREAF-CTFC)

    Title: Seminari/taller sobre comunicació científica

    Abstract

    Galileo Galilei, además de ser el fundador de la astronomía moderna, se destacó por su forma de escribir: obras en forma de diálogo entre personajes de ficción, humor en ellas, idioma italiano en lugar del latín. Todo ello para que sus obras fueran accesibles a todo aquel que supiera leer.  En pleno siglo XVII, Galileo utilizaba recursos modernos para comunicar ciencia. Fue el primer divulgador científico. El primero en comprender que la ciencia era capaz de moldear el sistema de valores sobre el que se asienta la sociedad y que la divulgación era para ello una actividad esencial.

    Hoy en día, en plena era de la información, las personas que investigan se han convertido en referentes en la sociedad y su capacidad para comunicar toma especial relevancia. Este seminario pretende ser una puerta abierta al mundo de la comunicación científica, su importancia y su significado. Se vestirá de taller para poner especial foco a las técnicas y recursos que hoy en día existen: cómo y dónde divulgar. En este último punto, se explorarán las posibilidades que ofrece Internet. Los bosques y la ciencia forestal serán el telón de fondo de los conceptos que se traten en esta jornada.

    CEMFOR SEMINAR – Mo Zhou

    Speaker: Mo Zhou (School of Natural Resource, West Virginia University)

    Title: New Advances in Markov Decision Process Models for Forest Management: Multi-criteria and Risk-sensitive Decision Making

    Abstract: This work synthesis two recent studies extending the classic linear-programming formulations of Markov Decision Process (MDP) models to, respectively, handle multiple objectives and reflect risk preference, in forest decision making. One study incorporated goal programming in MDPs with both average and discounted criteria to deal with multiple, often non commensurable and conflicting, objectives. The other adapted mean-variance or certainty equivalent optimization to MDPs with average rewards to reflect some consequences of the risk attitude of forestry decision makers. Both studies were applied to data for mixed softwood and hardwood forests in the southern United States, with multiple financial and ecological criteria. The results show that given equal weights for normalized criteria, minimum deviations from the highest diversity of tree size and species were achieved at the cost of, on average, one third of decline of other criteria from their maximum levels. Compared with risk neutrality or risk seeking, financial risk aversion induced shorter cutting cycles and, besides reducing expected annual financial returns and production, also lowered the expected diversity of tree species and size, stand basal area, stored CO2e, and old growth area.

    CEMFOR SEMINAR – Jennie Sandtröm / Frederick Carlsson

    Speakers: Jennie Sandtröm & Frederick Carlsson

    Title: Rocky pine forests in the High Coast Area (Sweden) and Wood Fungi and Forest Fire in a boreal context

    Abstract: Almost all forests in Sweden are managed to some extent, only a small fraction can be considered natural. However, low productive forests, mostly without formal protection and privately owned, has rarely been managed and can have old-growth characteristics. Pine (Pinus sylvestris) forests in the High Coast Area (World Heritage Area) are extremely rocky and nutrient poor. We have investigated the structure, dynamics, human impact and fire history in this extreme environment. This was done by sampling and measuring size, age, fire scars, dead wood amount and quality at eight rocky pine stands. The structure is diverse (sizes and ages, Dead wood) but the density low. Frequent small fires have occurred and many of them (13) during the 1600s. The rocky pine forests in the High Coast Area are most likely undisturbed forests with low human impact, exhibiting several old-growth characteristics and can be a valuable habitat for organisms connected to sun-exposed DW. Wood fungi are the most important group of decomposers in boreal forests, and can be regarded as the “engineers of dead wood”. Forest fire has been the main disturbance in these forests and thus, boreal species has had to adapt to repeated fires. Industrialization drastically changed forestry and since the beginning of the 1900´s, forest fires have become very scarse, species dependent on repeated fires has consequently gone extinct or can be considered threatened or near threatened. The loss of wood fungi biodiversity can have a major impact on many other species due to their important role in dead wood dynamics. Our studies has been focusing on several aspects of wood fungi – forest fire interaction, including adaptation, community dynamics and combative interactions. Species that can be related to forest fire has adapted and is strongly favored by the disturbance. Our research can be used for restoration purposes, planning and performing restoration fires

    CEMFOR SEMINAR – Kate Giljohann

    Speaker: Kate Giljohann (University of Melbourne, Australia)

    Title: A demographically effective measure of population size for disturbance-prone ecosystems

     

    Abstract

    Stochastic disturbances, such as fire, are important in many ecosystems. Disturbances can drive population dynamics; stimulating large changes in population size and structure. Understanding how population structure at one point in time influences future population size is key to making realistic estimates of population changes in disturbance-prone ecosystems.  Yet how population structure interacts with disturbance regimes is rarely considered in conservation management.

    A useful theory to account for the influence of population structure on future population size is the stochastic equivalent ratio. However, it is unclear whether this theory applies when stochasticity is large, such as in fire-prone environments.

    Using a population model for a fire-killed obligate seeder from semi-arid Australia, I explore the utility of the stochastic equivalent ratio and ask, can the ratio: i) indicate the potential for future population growth? ii) identify appropriate fire regimes? and iii) estimate the abundance of seedlings that will emulate the trajectory of a reference population?

    The method I evaluate, and then generalize, has wide applicability and great potential for achieving future plant and animal population goals when stochastic disturbances drive population dynamics.

    R workshop – Aitor Ameztegui

    Organizer: Aitor Ameztegui (CTFC-CREAF)

    Title: Using packages ‘tidyr’ and ‘dplyr’

     

    CEMFOR SEMINAR – Antoine Cabon

    Speaker: Antoine Cabon (Ph.D. student, CTFC-CREAF)

    Title: The ecohydrological equilibrium hypothesis allows quantifying the soil water supply of drought prone forests.

    Abstract: In water-limited ecosystems, such as Mediterranean ones, the amount of water plants can access (i.e. the Soil Water Supply, SWS) is a key determinant of forest demography (e.g. tree growth and mortality) and function (e.g. water and carbon fluxes).

    Although the link between soil moisture (θ) and soil water extractability by plants can be modelled through pedotransfer functions, the estimation of SWS is limited by the difficulty to measure the plants rooting depth (Z) and their Fine Roots Distribution (FRD) in the soil profile.

    Here we estimate Z and FRD for different forest plots located in Catalonia (Northeast Spain), where θ or transpiration (E, approached by
    sap flow measurements) observations were available, using simplified representation of plant hydraulics and the Eco-Hydrological Equilibrium (EHE) hypothesis. We assume that forest stands conform to this hypothesis and that their root system is therefore optimized in order to maximize transpiration within the limits of acceptable drought stress, characterized using species-specific critical levels of leaf water potentials (ψ).

    We simulate ψ, E and θ for different combinations of Z and FRD with a simple water balance model and use the simulations to approach the local actual values of Z and FRD by 1) hypothesizing optimized species root system and by 2) calibrating our model against E or θ observations. Estimates from both methods were in close agreement when water was a most limiting factor, therefore sustaining our initial hypothesis.

    Our method has the potential to palliate the lack of data concerning the root system of drought prone forests using only information on stand structure and plant hydraulic properties and could therefore enhance the modelling of water fluxes at large spatial scales.