Sun, 27 Jul 2008 07:17:37 BST CiteULike: neteler's Hudson http://www.citeulike.org/user/neteler/author/Hudson CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/neteler/article/2737725 <i>Journal of Animal Ecology, Vol. 69, No. 4. (2000), pp. 620-638.</i><br /><br />1. Time series data on five species of gamebird from the Dolomitic Alps were used to examine the relative importance of dispersal and common stochastic events in causing synchrony between spatially structured populations. 2. Cross-correlation analysis of detrended time series was used to describe the spatial pattern of fluctuations in abundance, while standardized time series were used to describe both fluctuations and the trend in abundance. There were large variations in synchrony both within and between species and only weak negative relationships with distance. 3. Species in neighbouring habitats were more likely to be in synchrony than species separated by several habitats. Species with similar density-dependent structure were more likely to be in synchrony. 4. In order to estimate the relative importance of dispersal and environmental stochasticity, we modelled the spatial dynamics of each species using two different approaches. First, we used estimating functions and bootstrapping of time series data to calculate the relative importance of dispersal and stochastic effects for each species. Second, we estimated the intensity of environmental stochasticity from climatic records during the breeding season and then modelled the dispersal rate and dispersal distance for each species. The two models exhibited similar results for rock ptarmigan, black grouse, hazel grouse and rock partridge, while contrasting patterns were observed for capercaillie. 5. The results suggest that environmental stochasticity plays the dominant role in synchronizing the fluctuations of these galliform species, although there will also be some dispersal between populations. Searching for mechanisms of synchrony in spatially structured gamebird populations Isabella Cattadori Stefano Merler Peter Hudson doi:10.1046/j.1365-2656.2000.00421.x Journal of Animal Ecology, Vol. 69, No. 4. (2000), pp. 620-638. 2008-04-30T12:37:01-00:00 2000 Journal of Animal Ecology 69 4 620 638 climate habitat synchrony http://www.citeulike.org/user/neteler/article/570796 <i>Ecology Letters, Vol. 9, No. 4. (April 2006), pp. 467-484.</i> Seasonality and the dynamics of infectious diseases Sonia Altizer Andrew Dobson Parviez Hosseini Peter Hudson Mercedes Pascual Pejman Rohani doi:10.1111/j.1461-0248.2005.00879.x Ecology Letters, Vol. 9, No. 4. (April 2006), pp. 467-484. 2006-03-30T14:33:32-00:00 2006 Ecology Letters 1461-023X 9 4 467 484 Blackwell Publishing disease dynamic infectious model seasonality http://www.citeulike.org/user/neteler/article/1065575 <i>(2002), pp. 102-118.</i> Spatial aspects of disease dynamics G Hess S Randolph P Arneberg C Chemini C Furlanello J Harwood M Roberts J Swinton (2002), pp. 102-118. 2007-01-24T17:34:47-00:00 2002 102 118 Oxford Univ. Press disease ecology ixodes modeling tick-borne ticks vector-borne wildlife zoonoses http://www.citeulike.org/user/neteler/article/750068 <i>Int J Parasitol, Vol. 33, No. 9. (August 2003), pp. 909-917.</i><br /><br />An important epidemiological consequence of aggregated host-parasite associations occurs when parasites are vectors of pathogens. Those hosts that attract many vectors will tend to be the focus of transmission. But to what extent, and can we identify characteristics of these key hosts? We investigated these questions with respect to the host-tick relationship of the yellow-necked mouse, Apodemus flavicollis, a critical host in the maintenance of the zoonotic disease, tick-borne encephalitis. Transmission of the virus occurs when ticks feed in a 'co-feeding' aggregation. Thus, the number and frequency of co-feeding groups provides an estimate of the potential rate of virus transmission. We recorded the spatio-temporal variations in co-feeding on a population of rodents in conjunction with recording individual host characteristics. Using Lorenz curves, we revealed conformation of tick-borne encephalitis transmission potential to the 20/80 Rule, where the 20% of hosts most infested with ticks were accountable for 80% of transmission potential. Hosts in the transmission cohort were identified as the sexually mature males of high body mass. Therefore control efforts targeted at this group would substantially reduce transmission potential compared to non-targeted control of the population, which resulted in a linear reduction in transmission potential. Focusing on the 'wrong' functional group would have little impact upon transmission potential until a considerable proportion of the population had been subject to control. However, individuals can change their functional status over time making it difficult to predict the contribution of these individuals to future transmission. Empirical evidence for key hosts in persistence of a tick-borne disease. SE Perkins IM Cattadori V Tagliapietra AP Rizzoli PJ Hudson Int J Parasitol, Vol. 33, No. 9. (August 2003), pp. 909-917. 2006-07-11T07:43:18-00:00 2003 Int J Parasitol 0020-7519 33 9 909 917 disease encephalitis host ixodes tick-borne ticks http://www.citeulike.org/user/neteler/article/573476 <i>(2002), pp. 119-138.</i> The ecology of tick-borne infections in wildlife reservoirs SE Randolph C Chemini C Furnanello C Genchi RS Hails PJ Hudson LD Jones G Medley RA Norman AP Rizzoli G Smith MEJ Woolhouse (2002), pp. 119-138. 2006-04-02T21:57:25-00:00 2002 119 138 Oxford Univ. Press disease ecology ixodes modeling tick-borne ticks vector-borne wildlife zoonoses http://www.citeulike.org/user/neteler/article/454062 <i>Epidemiology and Infection (22 December 2005), pp. 1-7.</i><br /><br />The spatial and temporal distribution of hantavirus and arenavirus antibody-positive wild rodents in Trentino, Italy, was studied using immunofluorescence assays (IFA) in two long-term sites trapped in 2000-2003, and six other sites trapped in 2002. The overall hantavirus seroprevalence in the bank voles, Clethrionomys glareolus (n=229) screened for Puumala virus (PUUV) antibodies was 0.4%, and that for Apodemus flavicollis mice (n=1416) screened for Dobrava virus (DOBV) antibodies was 0.2%. Antibodies against lymphocytic choriomeningitis virus (LCMV) were found in 82 (5.6%) of the 1472 tested rodents; the seroprevalence being 6.1% in A. flavicollis (n=1181), 3.3% in C. glareolus (n=276), and 14.3% in Microtus arvalis (n=7). Of the serum samples of 488 forestry workers studied by IFA, 12 were LCMV-IgG positive (2.5%) and one DOBV-IgG positive (0.2%), however, the latter could not be confirmed DOBV-specific with a neutralization assay. Our results show a widespread distribution but low prevalence of DOBV in Trentino, and demonstrate that the arenavirus antibodies are a common finding in several other rodent species besides the house mouse. Hantavirus and arenavirus antibody prevalence in rodents and humans in Trentino, Northern Italy. H Kallio-Kokko J Laakkonen A Rizzoli V Tagliapietra I Cattadori SEE Perkins PJJ Hudson A Cristofolini W Versini O Vapalahti A Vaheri H Henttonen doi:10.1017/S0950268805005431 Epidemiology and Infection (22 December 2005), pp. 1-7. 2006-01-02T12:33:48-00:00 2005 Epidemiology and Infection 0950-2688 1 7 arena hanta rodents http://www.citeulike.org/user/neteler/article/173313 <i>Med Vet Entomol, Vol. 15, No. 3. (September 2001), pp. 304-313.</i><br /><br />Ixodes ricinus ticks were collected from dragging vegetation and from shot roe deer in the province of Trento and Belluno in northern Italy. Ticks were pooled for analyses and from 1060 pools of ticks collected in the province of Belluno and 12390 tick samples collected in Trentino, four proved positive by immunofluorescence microscopy using a tick-borne encephalitis (TBE)-specific antiserum. The identity of the virus isolates was determined by RT-PCR cycle sequencing and they were all found to be closely similar (> 98% nucleotide identity) to typical western European TBE complex viruses as found in Austria. The isolates from Trentino differed from the Neudorfl strain of western European TBE virus at eight nucleotide positions but as these nucleotide substitutions were all synonymous, there were no amino acid changes. These results imply that the virus isolates in Trentino have changed slightly from the typical European strains isolated in nearby Austria. The abundance of questing ticks and ticks feeding on roe deer was greater in TBE positive hunting districts than in hunting districts where TBE complex viruses were only probable or believed to be absent. In TBE positive and probable districts synchrony in the seasonal dynamics of larvae and nymphs of L. ricinus was observed. This study provides evidence to suggest that roe deer may have an important role to play in the maintenance of tick density and in the persistence of TBE virus. Tick-borne encephalitis virus in northern Italy: molecular analysis, relationships with density and seasonal dynamics of Ixodes ricinus. PJ Hudson A Rizzoli R Rosà C Chemini LD Jones EA Gould Med Vet Entomol, Vol. 15, No. 3. (September 2001), pp. 304-313. 2005-04-28T09:21:08-00:00 2001 Med Vet Entomol 0269-283X 15 3 304 313 disease encephalitis ixodes ricinus