Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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    Data from: Land-use intensification effects on functional properties in tropical plant communities
    Carreno Rocabado, Geovana ; Pena Claros, Marielos ; Bongers, Frans ; Díaz, Sandra ; Quétier, Fabien ; Chuviñoa, José ; Poorter, Lourens - \ 2015
    Wageningen University & Research
    agriculture - tropical forest - functional diversity - secondary forest - land use intensity - functional traits - plant community - pastureland - present
    There is consensus that plant diversity and ecosystem processes are negatively affected by land-use intensification (LUI), but, at the same time, there is empirical evidence that a large heterogeneity can be found in the responses. This heterogeneity is especially poorly understood in tropical ecosystems. We evaluated changes in community functional properties across five common land-use types in the wet tropics with different land-use intensity: mature forest, logged forest, secondary forest, agricultural land, and pastureland, located in the lowlands of Bolivia. For the dominant plant species, we measured 12 functional response traits related to their life history, acquisition and conservation of resources, plant domestication, and breeding. We used three single-trait metrics to describe community functional properties: community abundance-weighted mean (CWM) traits values, coefficient of variation, and kurtosis of distribution. The CWM of all 12 traits clearly responded to LUI. Overall, we found that an increase in LUI resulted in communities dominated by plants with acquisitive leaf trait values. However, contrary to our expectations, secondary forests had more conservative trait values (i.e., lower specific leaf area) than mature and logged forest, probably because they were dominated by palm species. Functional variation peaked at intermediate land-use intensity (high coefficient of variation and low kurtosis), which included secondary forest but, unexpectedly, also agricultural land, which is an intensely managed system. The high functional variation of these systems is due to a combination of how response traits (and species) are filtered out by biophysical filters and how management practices introduced a range of exotic species and their trait values into the local species pool. Our results showed that, at local scales and depending on prevailing environmental and management practices, LUI does not necessarily result in communities with more acquisitive trait values or with less functional variation. Instead of the widely expected negative impacts of LUI on plant diversity, we found varying responses of functional variation, with possible repercussions on many ecosystem services. These findings provide a background for actively mitigating negative effects of LUI while meeting the needs of local communities that rely mainly on provisioning ecosystem services for their livelihoods.
    Does functional trait diversity predict aboveground biomass and productivity of tropical forests? Testing three alternative hypotheses
    Finegan, B. ; Pena Claros, M. ; Silva de Oliveira, A. ; Ascarrunz, N. ; Bret-Harte, M.S. ; Carreño Rocabado, I.G. ; Casanoves, F. ; Diaz, S. ; Eguiguren Velepucha, P. ; Fernandez, F. ; Licona, J.C. ; Lorenzo, L. ; Salgado Negret, B. ; Vaz, M. ; Poorter, L. - \ 2014
    Wageningen UR
    green soup hypothesis - biodiversity - biomass ratio - ecosystem processes - functional traits - commiunity weighted mean - niche complementary
    1. Tropical forests are globally important, but it is not clear whether biodiversity enhances carbon storage and sequestration in them. We tested this relationship focusing on components of functional trait biodiversity as predictors. 2. Data are presented for three rain forests in Bolivia, Brazil and Costa Rica. Initial above-ground biomass and biomass increments of survivors, recruits and survivors + recruits (total) were estimated for trees ≥10 cm d.b.h. in 62 and 21 1.0-ha plots, respectively. We determined relationships of biomass increments to initial standing biomass (AGBi), biomass-weighted community mean values (CWM) of eight functional traits and four functional trait variety indices (functional richness, functional evenness, functional diversity and functional dispersion). 3. The forest continuum sampled ranged from ‘slow’ stands dominated by trees with tough tissues and high AGBi, to ‘fast’ stands dominated by trees with soft, nutrient-rich leaves, lighter woods and lower AGBi. 4. We tested whether AGBi and biomass increments were related to the CWM trait values of the dominant species in the system (the biomass ratio hypothesis), to the variety of functional trait values (the niche complementarity hypothesis), or in the case of biomass increments, simply to initial standing biomass (the green soup hypothesis). 5. CWMs were reasonable bivariate predictors of AGBi and biomass increments, with CWM specific leaf area SLA, CWM leaf nitrogen content, CWM force to tear the leaf, CWM maximum adult height Hmax and CWM wood specific gravity the most important. AGBi was also a reasonable predictor of the three measures of biomass increment. In best-fit multiple regression models, CWMHmax was the most important predictor of initial standing biomass AGBi. Only leaf traits were selected in the best models for biomass increment; CWM SLA was the most important predictor, with the expected positive relationship. There were no relationships of functional variety indices to biomass increments, and AGBi was the only predictor for biomass increments from recruits. 6. Synthesis. We found no support for the niche complementarity hypothesis and support for the green soup hypothesis only for biomass increments of recruits. We have strong support for the biomass ratio hypothesis. CWMHmax is a strong driver of ecosystem biomass and carbon storage and CWM SLA, and other CWM leaf traits are especially important for biomass increments and carbon sequestration.
    A SCARECROW-RETINOBLASTOMA Protein Network Controls Protective Quiescence in the Arabidopsis Root Stem Cell Organizer
    Cruz-Ramirez, A. ; Diaz Trivino, S. ; Wachsman, G. ; Du, Y. ; Arteága-Vázquez, M. ; Zhang Hongtao, ; Benjamins, R. ; Blilou, I. ; Neef, A.B. ; Chandler, V. ; Scheres, B. - \ 2013
    PloS Biology 11 (2013)11. - ISSN 1545-7885 - 12 p.
    thaliana root - replication stress - cycle progression - clonal analysis - self-renewal - dna-damage - in-vivo - division - meristem - gene
    Quiescent long-term somatic stem cells reside in plant and animal stem cell niches. Within the Arabidopsis root stem cell population, the Quiescent Centre (QC), which contains slowly dividing cells, maintains surrounding short-term stem cells and may act as a long-term reservoir for stem cells. The RETINOBLASTOMA-RELATED (RBR) protein cell-autonomously reinforces mitotic quiescence in the QC. RBR interacts with the stem cell transcription factor SCARECROW (SCR) through an LxCxE motif. Disruption of this interaction by point mutation in SCR or RBR promotes asymmetric divisions in the QC that renew short-term stem cells. Analysis of the in vivo role of quiescence in the root stem cell niche reveals that slow cycling within the QC is not needed for structural integrity of the niche but allows the growing root to cope with DNA damage
    A bistable circuit involving SCARECROW-RETINOBLASTOMA integrates cues to inform asymmetic stem cell division
    Cruz-Ramirez, A. ; Diaz-Trivino, S. ; Blilou, I. ; Benjamins, R. ; Long, Y. ; Scheres, B.J.G. - \ 2012
    Cell 150 (2012)5. - ISSN 0092-8674 - p. 1002 - 1015.
    protein-protein interactions - arabidopsis root-meristem - tumor-suppressor - split luciferase - auxin transport - cycle - gene - differentiation - plants - growth
    In plants, where cells cannot migrate, asymmetric cell divisions (ACDs) must be confined to the appropriate spatial context. We investigate tissue-generating asymmetric divisions in a stem cell daughter within the Arabidopsis root. Spatial restriction of these divisions requires physical binding of the stem cell regulator SCARECROW (SCR) by the RETINOBLASTOMA-RELATED (RBR) protein. In the stem cell niche, SCR activity is counteracted by phosphorylation of RBR through a cyclinD6;1-CDK complex. This cyclin is itself under transcriptional control of SCR and its partner SHORT ROOT (SHR), creating a robust bistable circuit with either high or low SHR-SCR complex activity. Auxin biases this circuit by promoting CYCD6;1 transcription. Mathematical modeling shows that ACDs are only switched on after integration of radial and longitudinal information, determined by SHR and auxin distribution, respectively. Coupling of cell-cycle progression to protein degradation resets the circuit, resulting in a “flip flop” that constrains asymmetric cell division to the stem cell region.
    Application of DPASV to the study of heavy metal complexation in colloidal latex dispersions.
    Díaz-Cruz, J.M. ; Wonders, J.H.A.M. ; Leeuwen, H.P. van - \ 1995
    Electroanalysis 7 (1995). - ISSN 1040-0397 - p. 1143 - 1150.
    Voltammetry of metal complexes with macromolecules.
    Hoop, M.A.G.T. van den; Díaz-Cruz, J.M. ; Leeuwen, H.P. van - \ 1994
    Current Topics in Electrochemistry 3 (1994). - p. 77 - 91.
    Consistency of voltammetric metal speciation in latex particle dispersions.
    Díaz-Cruz, J.M. ; Wonders, J.H.A.M. ; Jong, H.G. de; Leeuwen, H.P. van - \ 1994
    Journal of Electroanalytical Chemistry 375 (1994). - ISSN 1572-6657 - p. 127 - 139.
    Polarography and differential pulse anodic stripping voltammetry of Pb(II)/polycarboxylate complexes.
    Diaz-Cruz, J.M. ; Arino, C. ; Esteban, M. ; Casassas, E. ; Leeuwen, H.P. van - \ 1993
    Journal of Electroanalytical Chemistry 344 (1993). - ISSN 1572-6657 - p. 119 - 134.
    Protolytic control in stripping voltammetric titrations of metal-polyacid complexes.
    Diaz-Cruz, J.M. ; Esteban, M. ; Hoop, M.A.G.T. van den; Leeuwen, H.P. van - \ 1992
    Analytica Chimica Acta 264 (1992). - ISSN 0003-2670 - p. 163 - 175.
    Stripping voltammetry of metal complexes: interferences from adsorption onto cell components.
    Diaz-Cruz, J.M. ; Esteban, M. ; Hoop, M.A.G.T. van den; Leeuwen, H.P. van - \ 1992
    Analytical Chemistry 64 (1992). - ISSN 0003-2700 - p. 1769 - 1776.
    Differential pulse anodic stripping voltammetry of some heavy metal - polycarboxylate complexes.
    Esteban, M. ; Diaz Cruz, J.M. ; Arino, C. ; Casassas, E. ; Hoop, M.A.G.T. van den; Leeuwen, H.P. van - \ 1990
    In: Abstract Heyrovsky Congr. Praag (1990) T-40
    Voltammetry of some heavy metal - polycarboxylate complexes.
    Esteban, M. ; Diaz Cruz, J.M. ; Arino, C. ; Casassas, E. ; Leeuwen, H.P. van - \ 1990
    In: Electro Spain Analysis. Gijon - p. 4 - 4.
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