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.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Wat doet een beek zelf na een project van beekherstel?
Eekhout, J.P.C. ; Hoitink, A.J.F. ; Huising, C. ; Talsma, M. - \ 2014
H2O : tijdschrift voor watervoorziening en afvalwaterbehandeling 47 (2014)5. - ISSN 0166-8439 - p. 34 - 35.
waterlopen - herstel - morfologie - gelderse vallei - streams - rehabilitation - morphology
Al 25 jaar voeren waterbeheerders projecten uit waarbij laglandbeken een kronkelende loop terugkrijgen. Maar wat gebeurt er precies met de vorm van zo'n beek na uitvoering van het project? Hoe lang duurt de aanpassingsperiode en welke factoren hebben invloed? De conclusies van een onderzoek in de Lunterse Beek.
Integrated soil fertility management in sub-Saharan Africa: unravelling local adaptation
Vanlauwe, B. ; Descheemaeker, K.K.E. ; Giller, K.E. ; Huising, J. ; Merckx, R. ; Nziguheba, G. ; Wendt, J. ; Zingore, S. - \ 2014
SOIL 1 (2014)2014. - ISSN 2199-3971 - p. 1239 - 1286.
Intensification of smallholder agriculture in sub-Saharan Africa is necessary to address rural poverty and natural resource degradation. Integrated Soil Fertility Management (ISFM) is a means to enhance crop productivity while maximizing the agronomic efficiency (AE) of applied inputs, and can thus contribute to sustainable intensification. ISFM consists of a set of best practices, preferably used in combination, including the use of appropriate germplasm, the appropriate use of fertilizer and of organic resources, and good agronomic practices. The large variability in soil fertility conditions within smallholder farms is also recognised within ISFM, including soils with constraints beyond those addressed by fertilizer and organic inputs. The variable biophysical environments that characterize smallholder farming systems have profound effects on crop productivity and AE and targeted application of limited agro-inputs and management practices is necessary to enhance AE. Further, management decisions depend on the farmer's resource endowments and production objectives. In this paper we discuss the "local adaptation" component of ISFM and how this can be conceptualized within an ISFM framework, backstopped by analysis of AE at plot and farm level. At plot level, a set of four constraints to maximum AE is discussed in relation to "local adaptation": soil acidity, secondary nutrient and micro-nutrient (SMN) deficiencies, physical constraints, and drought stress. In each of these cases, examples are presented whereby amendments and/or practices addressing these have a significantly positive impact on fertilizer AE, including mechanistic principles underlying these effects. While the impact of such amendments and/or practices is easily understood for some practices (e.g., the application of SMNs where these are limiting), for others, more complex interactions with fertilizer AE can be identified (e.g., water harvesting under varying rainfall conditions). At farm scale, adjusting fertilizer applications within-farm soil fertility gradients has the potential to increase AE compared with blanket recommendations, in particular where fertility gradients are strong. In the final section, "local adaption" is discussed in relation to scale issues and decision support tools are evaluated as a means to create a better understanding of complexity at farm level and to communicate best scenarios for allocating agro-inputs and management practices within heterogeneous farming environments.
Sustainable intensification and the African smallholder farmer
Vanlauwe, B. ; Coyne, D. ; Gockowski, J. ; Hauser, S. ; Huising, J. ; Masso, C. ; Nziguheba, G. ; Schut, M.L.W. - \ 2014
Current Opinion in Environmental Sustainability 8 (2014). - ISSN 1877-3435 - p. 15 - 22.
soil fertility gradients - yield gaps - agriculture - management - paradigm - poverty
Sub-Saharan Africa needs to produce more food, feed, and fiber to support its growing population and intensification of smallholder agriculture is a crucial component of any strategy towards this goal. Sustainable Intensification (SI) acknowledges that enhanced productivity needs to go hand in hand with the maintenance of other ecosystem services and enhanced resilience to shocks. A very diverse group of smallholders dominate SSA agriculture, with large heterogeneity in socio-technical conditions, famer typologies, production objectives, and the biophysical environment. This potentially generates a multitude of pathways from the current low productivity based on nutrient mining to SI. The institutional context needs to be right for delivering the necessary goods and services underlying SI, ensuring inclusiveness across household types and facilitating local innovation.
N2Africa: Final Report of the first Phase - 2009 - 2013
Woomer, P.L. ; Huising, J. ; Giller, K.E. ; Baijukya, F.P. ; Kantengwa, S. ; Vanlauwe, B. ; Boahen, S. ; Franke, A.C. ; Abaidoo, R. ; Dianda, M. ; Sanginga, J. ; Ronner, E. ; Brand, G.J. van den; Schilt, C. - \ 2014
N2Africa (N2Africa reports 73) - 138 p.
Aanpassing van de morfologie na beekherstel : casestudie Lunterse beek
Eekhout, J.P.C. ; Huising, C. ; Talsma, M.J.G. - \ 2014
waterlopen - ecologisch herstel - morfologie - waterbodems - hydrologie - gelderse vallei - streams - ecological restoration - morphology - water bottoms - hydrology
Over een periode van anderhalf jaar zijn morfologische, hydrologische en ecologische ontwikkelingen gemonitord na een herstelproject in de Lunterse beek. Tijdens een initiële vegetatieloze periode was de morfodynamiek groot, met een bochtafsnijding, oevererosie en oeveraangroei. Deze processen zijn gerelateerd aan de aanpassing van het lengteprofiel, dat sedimenttoevoer tot gevolg had. Vervolgens heeft vegetatie zich in de inundatiezone ontwikkeld. De morfodynamiek nam in deze periode af, de morfologische veranderingen speelden zich met name nog op de beekbodem af. De metingen laten zien dat de beekbodem stabiliseert na een initiële morfologische aanpassingsperiode van ongeveer acht maanden.
Verbeterd gebruik van peulvruchten geeft Afrikaans landbouwsysteem een boost
Vanlauwe, B. ; Giller, K.E. ; Huising, J. - \ 2013
Evaluation of the progress made towards achieving the Vision of Success in N2Africa
Franke, A.C. ; Wolf, J. ; Huising, J. ; Vanlauwe, B. ; Giller, K.E. - \ 2013
Wageningen : N2Africa (Milestone 1.6.1, 2.6.1.) - 21 p.
N2Africa Putting nitrogen fixation to work for smallholder farmers in Africa, Podcaster no 22, August, September and October 2013
Giller, K.E. ; Schilt, C. ; Huising, J. ; Franke, A.C. ; Jager, I. de - \ 2013
Wageningen : N2Africa project (Podcaster 22) - 14 p.
The conundrum of conservation agriculture and livelihoods in Southern Africa
Nkala, P. ; Mango, N. ; Corbeels, M. ; Veldwisch, G.J.A. ; Huising, J. - \ 2011
African Journal of Agricultural Research 6 (2011)24. - ISSN 1991-637X - p. 5520 - 5528.
Low crop productivity, food insecurity, hunger and malnutrition; inadequate farming knowledge and skills, implements and inputs are characteristic of smallholder agriculture in Southern Africa. Many researchers argue that conservation agriculture can guarantee higher crop productivity, food security, improved livelihoods and environmental protection, better than the unsustainable traditional systems of slash and burn practices. In this paper, we present the results of a meta-analysis of over 40 academic publications to review conservation agriculture’s role in influencing desired livelihood outcomes in Southern Africa. We conclude that the effectiveness of conservation agriculture towards better livelihood outcomes in Southern Africa remains debatable, especially when supportive government policies are lacking.
Digital Soil Map of the World
Sanchez, P.A. ; Ahamed, S. ; Carré, F. ; Hartemink, A.E. ; Hempel, J. ; Huising, J. ; Lagacherie, P. ; McBratney, A.B. ; McKenzie, N.G. ; Lourdes Mendonça-Santos, M. de; Minasny, B. ; Montanarella, L. ; Okoth, P. ; Palm, C.A. ; Sachs, J.D. ; Shepherd, K.D. ; Vägen, T. ; Vanlauwe, B. ; Walsh, M.G. ; Winowiecki, L.A. ; Zhang, G.L. - \ 2009
Science 325 (2009)5941. - ISSN 0036-8075 - p. 680 - 681.
Soils are increasingly recognized as major contributors to ecosystem services such as food production and climate regulation (1, 2), and demand for up-to-date and relevant soil information is soaring. But communicating such information among diverse audiences remains challenging because of inconsistent use of technical jargon, and outdated, imprecise methods. Also, spatial resolutions of soil maps for most parts of the world are too low to help with practical land management. While other earth sciences (e.g., climatology, geology) have become more quantitative and have taken advantage of the digital revolution, conventional soil mapping delineates space mostly according to qualitative criteria and renders maps using a series of polygons, which limits resolution. These maps do not adequately express the complexity of soils across a landscape in an easily understandable way
Stress-axis, thyroid-axis and immune system: the very first triunvirate in vertebrates
Flik, G. ; Klaren, P.H.M. ; Metz, J. ; Gorissen, M. ; Verburg-van Kemenade, B.M.L. ; Huising, M.O. - \ 2008
In: Abstract Book Conference 24th European Comparative Endocrinologists, Genoa, Italy, 2 - 6 September, 2008. - - p. 50 - 50.
Corticotropin-releasing factor (CRF) and CRF-binding protein expression in and release from the head kidney of common carp: evolutionary conservation of the adrenal CRF system
Huising, M.O. ; Aa, L.M. van der; Metz, J.R. ; Mazon, A.D. ; Verburg-van Kemenade, B.M.L. ; Flik, G. - \ 2007
Journal of Endocrinology 193 (2007)3. - ISSN 0022-0795 - p. 349 - 357.
hormone crh - euryhaline flounder - platichthys-flesus - factor receptors - stress-response - gland - secretion - pituitary - medulla - peptide
Corticotropin-releasing factor (CRF) plays a central role in the regulation of the stress axis. In mammals, CRF as well as its receptors and its CRF-binding protein (CRF-BP) are expressed in a variety of organs and tissues outside the central nervous system. One of these extrahypothalamic sites is the adrenal gland, where the paracrine actions of adrenal CRF influence cortical steroidogenesis and adrenal blood flow. Although the central role of CRF signaling in the initiation and regulation of the stress response has now been established throughout vertebrates, information about the possible peripheral presence of CRF in earlier vertebrate lineages is scant. We established the expression of CRF, CRF-BP, and the CRF receptor 1 in a panel of peripheral organs of common carp (Cyprinus carpio). Out of all the peripheral organs tested, CRF and CRF-BP are most abundantly expressed in the carp head kidney, the fish equivalent of the mammalian adrenal gland. This expression localizes to chromaffin cells. Furthermore, detectable quantities of CRF are released from the intact head kidney following in vitro stimulation with 8-bromo-cAMP in a superfusion setup. The presence of CRF and CRF-BP within the chromaffin compartment of the head kidney suggests that a pathway homologous to the mammalian intra-adrenal CRF system is present in the head kidney of fish. It follows that such a system to locally fine-tune the outcome of the centrally initiated stress response has been an integral part of the vertebrate endocrine system since the common ancestor of teleostean fishes and mammals.
Real-time gene expression analysis in carp (Cyprinus carpio) skin: inflammatory responses to injury mimicking infection with ectoparasites
Gonzalez, S.F. ; Huising, M.O. ; Stakauska, R. ; Forlenza, M. ; Verburg-van Kemenade, B.M.L. ; Buchmann, K. ; Nielsen, M.E. ; Wiegertjes, G.F. - \ 2007
Developmental and Comparative Immunology 31 (2007)3. - ISSN 0145-305X - p. 244 - 254.
necrosis-factor-alpha - innate immune-responses - rainbow-trout skin - common carp - oncorhynchus-mykiss - molecular-cloning - cxc chemokines - ichthyophthirius-multifiliis - interleukin-1-beta - cytokines
We studied a predictive model of gene expression induced by mechanical injury of fish skin, to resolve the confounding effects on the immune system induced by injury and skin parasite-specific molecules. We applied real time quantitative PCR (RQ-PCR) to measure the expression of the pro-inflammatory cytokines CXCa, CXCb, interleukin (IL)1-beta, tumor necrosis factor alpha (TNFalpha), and the receptors IL1R1, CXCR1 and CXCR2 in skin of Cyprinus carpio after mechanical injury. We also studied the expression of the anti-inflammatory cytokine IL-10. Most obvious, specific up-regulation of the chemokine CXCa, the chemokine receptor CXCR1 and the pro-inflammatory cytokine IL-beta was detected at 2-3h after injury. In order to correlate gene expression patterns after injury with cell migration, we studied chemotaxis of head kidney leukocytes towards lysates of epithelioma papulosum cyprini (EPC) cells. Neutrophilic granulocytes were shown to migrate towards epithelial lysates. Using immunohistochemistry we observed that the early inflammatory response after injury involved an influx of cells, most probably neutrophilic granulocytes, into the injured area. This suggests that the increased expression of pro-inflammatory genes is related to a rapid influx of neutrophilic granulocytes.
First appearance of Rodlet cells in carp (Cyprinus carpio) ontogeny and their possible roles during stress and infection
Mazon, A.F. de; Huising, M.O. ; Taverne-Thiele, J.J. ; Bastiaans, J.H.M.W. ; Verburg-van Kemenade, B.M.L. - \ 2007
Fish and Shellfish Immunology 22 (2007)(1-2). - ISSN 1050-4648 - p. 27 - 37.
trout oncorhynchus-mykiss - rhabdospora-thelohani - rainbow-trout - crh-bp - ultrastructure - intestine - fish - expression - cortisol - teleosts
The origin and function of rodlet cells (RCs) are still a matter of discussion. Whereas the exogenous hypothesis considers them parasites, the endogenous hypothesis regards them as a genuine fish cell population with a secretory and/or leukocyte function. In order to shed more light on these questions we focused on the location and appearance of RCs during carp (Cyprinus carpio) ontogeny. Typical RCs were seen at 5 days post fertilisation (dpf) between kidney and intestine, at 6 dpf in the intestine and at 8 dpf in both anterior and posterior kidney and in the abdominal cavity among the mesothelial cells. The RC number increased with age and after 14 dpf they were also present in gills. The early appearance of the RCs during carp ontogeny support the endogenous hypothesis stating that RCs are genuine constituents of fish tissue and suggest that they are `immune cells¿. The fact that the RCs of the gills secrete their content into the surrounding water, combined with the strategic location around blood vessels in kidney and within intestinal epithelium, would also support an important role in host defense. To investigate whether RC numbers in gills and kidney are related to typical fluctuations in the physiology during stress and infection we counted their number in gills and kidney after parasite infection and stress. In the gills the number of RCs increased after infection but did not change after stress while in the kidney their number increased after stress and no significant changes were observed after infection
Phylogeny and evolution of class-I helical cytokines
Huising, M.O. ; Kruiswijk, C.P. ; Flik, G. - \ 2006
Journal of Endocrinology 189 (2006)1. - ISSN 0022-0795 - p. 1 - 25.
leukemia-inhibitory factor - colony-stimulating factor - recombinant human interleukin-11 - neurotrophic factor-receptor - trout oncorhynchus-mykiss - embryonic stem-cells - chicken leptin gene - oncostatin-m osm - molecular-cloning - growth-hormone
The class-1 helical cytokines constitute a large group of signalling molecules that play key roles in a plethora of physiological processes including host defence, inuinine regulation, somatic growth, reproduction, food intake and energy metabolism, regulation of neural growth and many more. Despite little primary amino acid sequence similarity, the view that A contemporary class-1 helical cytokines have expanded from a single ancestor is widely accepted, as A class-1 helical cytokines share a similar three-dimensional fold, signal via related class-1 helical cytokine receptors and activate similar intracellular signalling cascades. Virtually all of our knowledge on class-1 helical cytokine signalling derives from research on primate and rodent species. Information on the presence, structure and function of class-1 helical cytokines in non-mammalian vertebrates and non-vertebrates is fragmentary. Consequently, our ideas about the evolution of this versatile inultigene firmly are often based on a limited comparison of human and murine orthologs. In the last 5 years, whole genome sequencing projects have yielded draft genomes of the early vertebrates, pufferfish (Takifugu rubripes), spotted green pufferfish (Tetraodon nigroviridis) and zebrafish (Danio rerio). Fuelled by this development, Fish orthologs of a number of mammalian class-1 helical cytokines have recently been discovered. In this review, we have characterised the mammalian class-1 helical cytokine family and compared it with the emerging class-1 helical cytokine repertoire of teleost fish. This approach offers important insights into cytokine evolution as it identifies the helical cytokines shared by fish and mammals that, consequently, existed before the divergence of teleosts and tetrapods. A 'fish-mammalian' comparison will identify the class-1 helical cytokines that still await discovery ill fish or, alternatively, may have been evolutionarily recent additions to the mammalian cytokine repertoire.
Signaling molecules for multidirectional neuro-endocrine-immune interaction
Verburg-van Kemenade, B.M.L. ; Huising, M.O. ; Flik, G. - \ 2006
Type-1 cytokines in teleost fish: evolutionary conservation in relation to their functions
Verburg-van Kemenade, B.M.L. ; Flik, G. ; Savelkoul, H.F.J. ; Huising, M.O. - \ 2006
In: Abstracts 10th ISDCI Congress 2006. - Charleston, USA : - p. 205 - 205.
CXC chemokines in common carp show different degrees of sequence conservation reflecting their putative function in ontogeny and leukocyte chemotaxis
Verburg-van Kemenade, B.M.L. ; Flik, G. ; Savelkoul, H.F.J. ; Huising, M.O. - \ 2006
In: Abstracts of the 10th ISDCI Congress, Charleston, USA, July 1-6, 2006. - Charleston, USA : - p. 205 - 205.
The presence of multiple and differentially regulated interleukin-12p40 genes in bony fishes signifies an expansion of the vertebrate heterodimeric cytokine family
Huising, M.O. ; Schijndel, J. van; Kruiswijk, C.P. ; Nabuurs, S.B. ; Savelkoul, H.F.J. ; Flik, G. ; Verburg-van Kemenade, B.M.L. - \ 2006
Molecular Immunology 43 (2006)10. - ISSN 0161-5890 - p. 1519 - 1533.
cell stimulatory factor - il-12 p40 homodimer - cyprinus-carpio l - cd4(+) t-cells - in-vitro - molecular evolution - immune-responses - th1 responses - teleost fish - common carp
Interleukin-12 (IL-12) is the founding member of a rapidly growing family of heterodimeric cytokines. It consists of two subunits, designated p35 and p40 that together constitute a disulphide-linked heterodimeric cytokine. IL-12 is well known for its prominent role in both the early innate immune response and the skewing of the ensuing acquired immune response towards Th1. Here, we report the presence of IL-12p35 and three highly distinct IL-12p40 genes in common carp (Cyprinus carpio). The carp is a bony fish species genetically similar to the zebrafish, but its substantially larger body size facilitates immunological studies. A comparison of IL-12p35 genes of mammalian and non-mammalian species reveals the presence of a duplicated exon that is unique to the mammalian lineage. The organisation of the three carp IL-12p40 genes is similar to that of higher vertebrates. Phylogenetic analyses that include the p40-related subunits of other composite cytokines confirm the presence of three genuine IL-12p40 genes in carp and indicate that they are evolutionary ancient and possibly not restricted to bony fishes. The orthology of the different carp p40 subunits to mammalian IL-12p40 is further evident from the conservation of key residues involved in the formation of intra- and interchain disulphide bridges and the tight interlocking topology between p35 and p40. The expression of each of the carp IL-12p40 genes differs profoundly, constitutively as well as in response to in vitro stimulation of carp macrophages. Collectively, the presence of multiple and substantially different IL-12 genes signifies a considerable expansion of the vertebrate heterodimeric cytokine family
Endurance exercise differentially stimulates heart and axial muscle development in zebrafish (Danio rerio)
Meulen, T. van der; Schipper, H. ; Boogaart, J.G.M. van den; Huising, M.O. ; Kranenbarg, S. ; Leeuwen, J.L. van - \ 2006
American Journal of Physiology. Regulatory, Integrative and Comparative Physiology 291 (2006). - ISSN 0363-6119 - p. R1040 - R1048.
rainbow-trout - teleost fish - oncorhynchus-mykiss - brachydanio-rerio - erythropoietin - fibers - growth - performance - expression - ontogeny
Mechanical load is an important factor in the differentiation of cells and tissues. To investigate the effects of increased mechanical load on development of muscle and bone, zebrafish were subjected to endurance swim training for 6 h/day for 10 wk starting at 14 days after fertilization. During the first 3 wk of training, trained fish showed transiently increased growth compared with untrained (control) fish. Increased expression of proliferating cell nuclear antigen suggests that this growth is realized in part through increased cell proliferation. Red and white axial muscle fiber diameter was not affected. Total cross-sectional area of red fibers, however, was increased. An improvement in aerobic muscle performance was supported by an increase in myoglobin expression. At the end of 10 wk of training, heart and axial muscle showed increased expression of the muscle growth factor myogenin and proliferating cell nuclear antigen, but there were major differences between cardiac and axial muscle. In axial muscle, expression of the "slow" types of myosin and troponin C was increased, together with expression of erythropoietin and myoglobin, which enhance oxygen transport, indicating a shift toward a slow aerobic phenotype. In contrast, the heart muscle shifts to a faster phenotype but does not become more aerobic. This suggests that endurance training differentially affects heart and axial muscle
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