- N. Hartemink (5)
- J.A.P. Heesterbeek (1)
- H. Heesterbeek (1)
- J.A.P. Hesterbeek (1)
- E. Jongejans (1)
- A.A. Koeijer de (2)
- A. Koeijer de (1)
- H. Kroon de (1)
- R. Meiswinkel (1)
- B.V. Purse (1)
- D.J. Rogers (1)
Hoe een modelleur een mug vangt - het nut van wiskundige modellen voor het bestuderen en bestrijden van vector-overgedragen ziekten
Braks, M.A.H. ; Fischer, E.A.J. ; Hartemink, N. - \ 2011
Entomologische Berichten 71 (2011)5. - ISSN 0013-8827 - p. 136 - 142.
culicidae - epidemiologie - vectoren, ziekten - epidemiology - disease vectors
Vector-overgedragen ziekten zijn infectieziekten die worden overgedragen door vectoren, meestal anthropoden, zoals muggen, knutten en teken. De laatste jaren is de aandacht voor deze ziekten toegenomen. Aanleidingen hiervoor zijn bijvoorbeeld de uitbraak van het West-Nijlvirus in Noord-Amerika, de recente blauwtong-epidemie in Nederland en omringende landen en de uitbraak van chikungunya in Italië.
Mapping the basic reproduction number (Ro) for vector-borne diseases: A case study on bluetongue virus.
Hartemink, N. ; Purse, B.V. ; Meiswinkel, R. ; Brown, H.E. ; Koeijer, A.A. de; Elbers, A.R.W. ; Boender, G.J. ; Rogers, D.J. ; Heesterbeek, J.A.P. - \ 2009
Epidemics 1 (2009)3. - ISSN 1755-4365 - p. 153 - 161.
Geographical maps indicating the value of the basic reproduction number, R0, can be used to identify areas of higher risk for an outbreak after an introduction. We develop a methodology to create R0 maps for vector-borne diseases, using bluetongue virus as a case study. This method provides a tool for gauging the extent of environmental effects on disease emergence. The method involves integrating vector-abundance data with statistical approaches to predict abundance from satellite imagery and with the biologically mechanistic modelling that underlies R0. We illustrate the method with three applications for bluetongue virus in the Netherlands: 1) a simple R0 map for the situation in September 2006, 2) species-specific R0 maps based on satellite-data derived predictions, and 3) monthly R0 maps throughout the year. These applications ought to be considered as a proof-of-principle and illustrations of the methods described, rather than as ready-to-use risk maps. Altogether, this is a first step towards an integrative method to predict risk of establishment of diseases based on mathematical modelling combined with a geographic information system that may comprise climatic variables, landscape features, land use, and other relevant factors determining the risk of establishment for bluetongue as well as of other emerging vector-borne diseases.
Epidemiological analysis of the 2006 bluetongue virus serotype 8 epidemic in north-western Europe, A risk map for epidemic potential in the Netherlands
Koeijer, A. de; Hartemink, N. ; Boender, G.J. ; Elbers, A.R.W. ; Hesterbeek, J.A.P. - \ 2007
niet bekend : EFSA - 18
bluetonguevirus - epidemieën - epidemiologie - risicoschatting - virusziekten - ziekten overgebracht door vectoren - ziekteoverdracht - nederland - noordwest-europa - bluetongue virus - epidemics - epidemiology - risk assessment - viral diseases - vector-borne diseases - disease transmission - netherlands - northwestern europe
One of the most important aspects of vector-borne infections is the strong influence of weather and climate on the transmission. In response to the major epidemic of bluetongue in north western Europe between summer and autumn 2006, an interest in BTV control issues developed. In this context, a map indicating the spatial variation in BTV risk in the north western European region would be very useful. To this end, a new approach is used in which they combine a mathematical epidemiological model and a geographical information system to obtain a spatially explicit measure for the risk of an outbreak of BTV when the virus is introduced in an area
|Bluetongue epidemiology and modelling: a risk map for epidemic potential in the Netherlands
Koeijer, A.A. de; Hartemink, N. ; Boender, G.J. ; Elbers, A.R.W. ; Heesterbeek, H. - \ 2007
Lelystad : Animal Sciences Group (Report / Animal Sciences Group 07/100410)
Flexible life history responses to flower and rosette bud removal in three perennial herbs
Hartemink, N. ; Jongejans, E. ; Kroon, H. de - \ 2004
Oikos 105 (2004). - ISSN 0030-1299 - p. 159 - 167.
resource-allocation - meristem allocation - succisa-pratensis - fruit removal - clonal plant - patterns - growth - reproduction - populations - simulation
Flexible life history responses to flower and rosette bud removal in three perennial herbs Nienke Hartemink, Eelke Jongejans and Hans de Kroon, In a garden experiment we investigated the response to continuous removal of either flower buds or rosette buds in three perennial grassland species (Hypochaeris radicata, Succisa pratensis and Centaurea jacea), which differ in longevity and flowering type. We distinguished two possible responses: compensation for lost buds by making more buds of the same type, and switching towards development of other life history functions. Both responses were demonstrated in our experiment, but bud removal had significantly different effects in each of the three species. The degree of compensation and the expression of trade-offs between life history functions differed markedly between species and seem related to longevity and developmental constraints. With respect to switching, our results suggest costs of reproduction and a trade-off between life history functions, at least for Hypochaeris and Succisa. For these species weight of new rosettes increased when resource allocation to flowering was inhibited. In Hypochaeris, we see that both compensation for lost flower buds and switching from lost rosette buds increased production of flower buds, underscoring the pivotal role of sexual reproduction in this short-lived species. The most prominent response seen in Centaurea is compensation for lost rosette buds, indicating that this long-lived species with monocarpic rosettes relies on rosette formation. Although Succisa does respond to bud removal, time is an important constraint in this species with long-lived rosettes and preformed flowering stalks. Trade-offs in Succisa seem to operate at a larger time scale, requiring long-lasting experiments to reveal them. We conclude that the response of these species to inflicted damage is likely to be linked to their longevity and developmental constraints.