Filter by collection

Current filters:

Current filters:

Refine By:

Search Results

  • previous
  • 1
  • next
Results 1-9 of 9 (Search time: 0.001 seconds).
Item hits:
  • LA

  • Biodiversity in fragmented key resource areas :Presistence of plant diversity and productivity in an intensely grazed key resource area

    • Authors: Skidmore, A.K.; Muthoni, F.K.;  Advisor: -;  Participants: - (2014)

  • Thesis investigates the drivers of large ungulate biomass density in the KRA along Lake Naivasha; investigates the impact of large ungulates grazing and rainfall on productivity (regrowth) and residual aboveground biomass of herbaceous plants; compares a novel method (ManyGLM) against the distance- based redundancy analysis (db-RDA) in detecting the multivariate effect of ungulate grazing on plant community composition and identification of the species that are most responsive to grazing; analyzes the impacts of continuous intense grazing by large herbivore on herbaceous plant diversity and composition in the fragmented KRA; evaluates the relative contribution of environmental heterogeneity and species dispersal limitation (spatial distances) on variation in plant beta-diversity in ...
  • LA

  • Mapping spatial variation of foliar nitrogen using hyper spectral  remote sensing

    • Authors: Skidmore, A.K.; Wang, Z.;  Advisor: -;  Participants: - (2016)

  • Thesis assessed the ability of indirect estimation of nitrogen using the link with leaf traits retrieved from PROSPECT-5 model inversion; evaluated the feasibility of retrieving nitrogen through recalibrating PROSPECT- 5 by incorporating the effects of leaf protein and cellulose + lignin on leaf reflectance and transmittance; tested if nitrogen can still be retrieved if canopy structural effects were corrected for the canopy BRF; investigated to what extent nitrogen can be retrieved by linking a recalibrated PROSPECT-5 and canopy reflectance models such as INFORM.
  • LA

  • Knowledge oriented species distribution modelling

    • Authors: Skidmore, A.K.; Niamir, A.;  Advisor: -;  Participants: - (2014)

  • Thesis outlines the incorporation of existing knowledge into a conventional approach to predict the distribution of Bonelli’s eagle at a resolution 100 times finer than available atlas data, in Malaga province, southern Spain; demonstrates the use of species taxonomy to delineate environmental extent and evaluates how this affects the performance of species distribution models for 356 terrestrial species in mainland Spain; explores the application of the Dempter-Shafer Theory of Evidence in modelling the distribution of a well-known (Bonelli’s eagle), and a poorly-studied (Short-toed Eagle) species in mainland Spain; the synthesis, summarizes and discusses the main findings, and outlines perspectives for future research.
  • LA

  • Methods in movement :Deconstructing bird behaviour with wavelets

    • Authors: Skidmore, A.K.; Sur, M.;  Advisor: -;  Participants: - (2014)

  • Thesis distincts strengths of fractals and wavelets analysis paradigm are used for better understanding animal movement behaviour and factors influencing movement at different spatio temporal scales; demonstrate the usefulness of cross wavelet analysis (as a signal for correlation between two signals) for the segmentation of movement trajectories into extensive and intensive search strategies; proposes an approach to detect behavioural change points in animal movements at migratory scales using discrete wavelet transforms. We compare two methods by applying the already accepted Lavielle method (Lavielle, 1999, 2005) with discrete wavelet analysis; periodic behaviour of moving animals in relation to periodic environmental cues by using cross wavelet analysis and show relevant correla...
  • LA

  • Modelling population dynamics and persistence in fragmented landscapes

    • Authors: Skidmore, A.K.; Ye, X.;  Advisor: -;  Participants: - (2014)

  • Thesis examines the relative importance of patch size, patch isolation, and spatiotemporal variation in within-patch habitat quality in determining population dynamics in fragmented landscapes; explores how spatial pattern of within-patch habitat quality affect population dynamics and long-term persistence in fragmented landscapes; tests the joint effects of the scale of spatial autocorrelation in habitat quality and species’ life-history traits on population dynamics in spatially heterogeneous landscapes; presents a wavelet-based approach to disentangle the roles of structural and functional landscape spatial heterogeneity in animal space use at multiple spatial scales, using a case study of American black bears (Ursus americanus) in a Canadian boreal forest.
  • LA

  • On uncertainty in species distribution modelling

    • Authors: Skidmore, A.K.; Naimi, B.;  Advisor: -;  Participants: - (2015)

  • Thesis investigates the impact of positional uncertainty in species data and explores if examining (global) spatial autocorrelation in predictors can be a solution to understand the models’ robustness to these kind of uncertainty; using local indicators of spatial association to investigate where the positional uncertainty affects the models more; addresses the problem of modelling (local) spatial association and introduces a new method to measure local spatial associations; explores and visualizes model uncertainty in species distribution modelling; provides a synthesis based on the previous chapters, and suggestions for the future works.
  • BB

  • Remote Sensing for Biodiversity

    • Authors: Skidmore, A.K.;  Advisor: -;  Participants: - (2017)

  • Remote sensing (RS)—taking images or other measurements of Earth from above—provides a unique perspective on what is happening on the Earth and thus plays a special role in biodiversity and conservation applications. The periodic repeat coverage of satellite-based RS is particularly useful for monitoring change and so is essential for understanding trends, and also provides key input into assessments, international agreements, and conservation management. Historically, RS data have often been expensive and hard to use, but changes over the last decade have resulted in massive amounts of global data being available at no cost, as well as significant (if not yet complete) simplification of access and use. This chapter provides a baseline set of information about using RS for conservat...
  • LT

  • Remote sensing of essential biodiversity :Powerpoint

    • Authors: Mucher, S.; Skidmore, A.K.;  Advisor: -;  Participants: - (2014)

  • This lecture presents: Global biodiversity loss; What are essential biodiversity variables (ebv)?; Global climate observing system essential climate variables (ecv); Agree biodiversity metrics to track from space; Definitive set of biodiversity variables to track from space; Mismatch in the definition of remote sensing and ecological units; Progress in satellites.
  • previous
  • 1
  • next