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  • 1.
    Christensen, Pernilla
    et al.
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Ekologi, miljö och geovetenskap.
    Ecke, F.
    Sandström, P.
    Nilsson, M.
    Hörnfeldt, Birger
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Ekologi, miljö och geovetenskap.
    Can landscape properties predict occurrence of grey-sided voles?2008Ingår i: Population Ecology, Vol. 50, nr 2, s. 169-179Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    There has been a long-term decline in spring and fall numbers of Clethrionomys rufocanus in boreal Sweden in 1971-2005. Previous studies on permanent sampling plots in the centre of 2.5 x 2.5 km landscapes suggested that habitat fragmentation (sensu destruction) could have contributed to the decline. Therefore, we tested these findings in a field study and compared trapping results on the central sampling plots of landscapes with a low degree of fragmentation (LDF) and of "hot spot" type with trapping results in managed forest landscapes with a high degree of fragmentation (HDF). We predicted that C. rufocanus would be more common on the LDF plots. We used our permanent plots supplemented with a new sample of plots, mainly of the rare LDF type, inside or just outside the long-term study area. Very few voles were trapped on both plot types, and no difference was found. However, a subsequent pilot study with trapping in a national park with large areas of pristine, unfragmented forest yielded more voles than in the managed, more fragmented, areas. Consequently, the initial field study data and some other recent data were also re-analysed from a "local patch quality" perspective. This alternative approach revealed the positive importance of large focal patches of forest > 60 years old and their content of old-growth (pine) forest (> 100 years). Interestingly, at the landscape level, the frequency distribution of patches of forest > 60 years old, old-growth (> 100 years), and especially of old-growth pine forest (> 100 years), relative to the properties of plots with C. rufocanus, suggested that there are few forest patches left that are suitable for C. rufocanus. Our current results suggest that habitat fragmentation cannot be excluded as a contributing cause to the long-term decline of C. rufocanus in boreal Sweden.

  • 2.
    Christensen, Pernilla
    et al.
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
    Ecke, Frauke
    Sandström, Per
    Nilsson, Mats
    Hörnfeldt, Birger
    Dependence of Clethrionomys rufocanus on focal forest patch size and qualityManuskript (Övrigt vetenskapligt)
  • 3.
    Christensen, Pernilla
    et al.
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
    Hörnfeldt, Birger
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
    Habitat preference of Clethrionomys rufocanus in boreal Sweden2006Ingår i: Landscape Ecology, ISSN 0921-2973, E-ISSN 1572-9761, Vol. 21, nr 2, s. 185-194Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A long-term decline of vole populations in boreal Sweden, especially of the grey-sided vole (Clethrionomysrufocanus Sund.), has been revealed by snap-trapping in 1971–2004. We identified important habitats forthe grey-sided vole by mapping the distribution of cumulated number of reproductive females in 1971–1978, prior to the major decline in the 1980s. Mean abundance of C. rufocanus was higher in the western(inland) than eastern (coastland) part of the study area. As the inland appeared to represent the most, as faras we know, pristine, abundant part of the population, we based identification of high quality habitats oninland data only. Four habitats were more important than others and yielded nearly 86% of the reproductivefemales in spring: (1) forests of dry, (2) moist and (3) wet/hydric dwarf-shrub type, in addition to (4)forest/swamp complexes rich in dwarf-shrubs. The latter three habitats were used more frequently thanexpected from their occurrence in the landscape. Still, the variation in density of reproductive femaleswithin patches of the same habitat was frequently high. This suggested that habitat composition in thesurrounding landscape, perhaps may have affected local vole density at the patch scale. Clear-cut samplingplots appeared to be low-frequently used by reproductive females, but also by males and immatures. Inconclusion, our study indicated the importance of also studying habitat at a larger scale than that of thepatch to get a deeper understanding on how habitat influences local and regional densities and populationdynamics of C. rufocanus.

  • 4.
    Christensen, Pernilla
    et al.
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
    Hörnfeldt, Birger
    Long-term decline of vole populations in northern Sweden: a test of the destructive sampling hypothesis2003Ingår i: Journal of Mammalogy, ISSN 1545-1542, Vol. 84, nr 4, s. 1292-1299Artikel i tidskrift (Refereegranskat)
  • 5. Ecke, F
    et al.
    Christensen, P
    Sandström, P
    Hörnfeldt, Birger
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Ekologi, miljö och geovetenskap.
    Identification of landscape elements related to local declines of a boreal grey-sided vole population2006Ingår i: Landscape Ecology, Vol. 21, s. 485-497Artikel i tidskrift (Refereegranskat)
  • 6. Ecke, Frauke
    et al.
    Christensen, Pernilla
    Rentz, Ralf
    Nilsson, Mats
    Sandström, Per
    Hörnfeldt, Birger
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap. Vindelfjällens forskningsstation, Ammarnäs, Sweden; Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences, Umeå, Sweden .
    Landscape structure and the long-term decline of cyclic grey-sided voles in Fennoscandia2010Ingår i: Landscape Ecology, ISSN 0921-2973, E-ISSN 1572-9761, Vol. 25, nr 4, s. 551-560Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Changes in forest landscape structure have been suggested as a likely contributing factor behind the long-term decline in the numbers of cyclic grey-sided voles (Clethrionomys rufocanus) in northern Fennoscandian lowland regions in contrast to mountain regions due to the absence of forest management in the mountains. This study, for the first time, formally explored landscape structure in 29 lowland (LF) and 14 mountain forest (MF) landscapes (each 2.5 x 2.5 km) in northern Sweden, and related the results to the cumulated spring trapping index of the grey-sided vole in 2002-2006. The grey-sided vole showed striking contrasts in dynamics close in space and time. The MF landscapes were characterized by larger patches and less fragmentation of preferred forest types. The grey-sided vole was trapped in all of 14 analyzed MF landscapes but only in three out of 29 of the LF landscapes. MF and LF landscapes with grey-sided vole occurrence were characterized by similar focal forest patch size (mean 357 ha, minimum 82 ha and mean 360 ha, minimum 79 ha, respectively). In contrast, these MF compared to the LF landscapes were characterized by larger patches of preferred forest types and less fragmented preferred forest types and by a lower proportion of clear-cut areas. The present results suggest that landscape structure is important for the abundance of grey-sided voles in both regions. However, in the mountains the change from more or less seasonal dynamics to high-amplitude cycles between the mid 1990s and 2000s cannot be explained by changes in landscape structure.

  • 7. Ecke, Frauke
    et al.
    Christensen, Pernilla
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
    Sandström, Per
    Hörnfeldt, Birger
    Identification of landscape elements related to declines of grey-sided vole populations2006Ingår i: Landscape Ecology, ISSN 0921-2973, Vol. 21, nr 4, s. 485-497Artikel i tidskrift (Refereegranskat)
  • 8.
    Hipkiss, T
    et al.
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Ekologi, miljö och geovetenskap.
    Hörnfeldt, B
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Ekologi, miljö och geovetenskap.
    High interannual variation in the hatching sex ratio of Tengmalm’s owl broods during a vole cycle2004Ingår i: Po Ecol, Vol. 46, s. 263-268Artikel i tidskrift (Refereegranskat)
  • 9.
    Hipkiss, Tim
    et al.
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Ekologi, miljö och geovetenskap.
    Stefansson, O.
    Hörnfeldt, Birger
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Ekologi, miljö och geovetenskap.
    Effect of cyclic and declining food supply on great grey owls in boreal Sweden2008Ingår i: Canadian Journal of Zoology, Vol. 86, s. 1426-1431Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this study of 35 years of data, we examine the short-term (cyclic) and long-term relationship between breeding success of great grey owls (Strix nebulosa Forster, 1772) and their food supply (bank voles (Clethrionomys glareolus (Schreber, 1780)), grey-sided voles (Clethrionomys rufocanus (Sundevall, 1846)), and field voles (Microtus agrestis (L., 1761))) in northern Sweden. Annual number of owl nests showed a 3 year cyclicity, which as predicted, corresponded to the length of the vole cycle in the region. Mean annual brood size also fluctuated and was positively dependent on the vole supply during the same spring. In this region, there has also been a decline in vole numbers in recent decades, from high-amplitude cycles in the 1970s to subsequent low-amplitude cycles. Correspondingly, and as predicted, mean annual brood size of the owls also declined, although only during the third years of the vole cycle when vole supply in spring and brood size of the owls is at its highest level in high-amplitude cycles. We predict that in the long run the vole decline, associated with increasingly milder winters, and the reduction of the brood size of the owls, especially in years of high owl breeding success, will have serious implications for the population of great grey owls in Scandinavia.

  • 10.
    Hörnfeldt, B
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Ekologi, miljö och geovetenskap.
    Long-term decline in numbers of cyclic voles in boreal Sweden: analysis and presentation of hypotheses2004Ingår i: Oikos, Vol. 107, s. 376-392Artikel i tidskrift (Refereegranskat)
  • 11.
    Hörnfeldt, Birger
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Ekologi och geovetenskap.
    Cycles of voles, predators, and alternative prey in boreal Sweden1991Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Bank voles, grey-sided voles, and field voles had synchronous 3-4 year density cycles with variable amplitudes which averaged about 200-fold in each species. Cycles of vole predators (red fox and Tengmalm's owl), and their (foxes') alternative prey (mountain hare and forest grouse) lagged behind the vole cycles.

    The nomadic Tengmalm's owl responded with a very rapid and strong numerical increase to the initial cyclic summer increase of voles (the owl’s staple food). Owl breeding densities in the springs were highly correlated with vole supply in the previous autumns. This suggested that the number of breeding owls was largely determined in the autumn at the time of the owl's nomadic migrations, and that immigration was crucial for the rapid rise in owl numbers. The owl's numerical response was reinforced by the laying of earlier and larger clutches when food was plentiful. In addition, the owl has an early maturation at one year of age.

    The transition between subsequent vole cycles was characterized by a distinct shift in rate of change in numbers from low to high or markedly higher values in both summer and winter. Regulation increased progressively throughout the cycle since the rate of change decreased continuously in the summers. Moreover, there was a similar decrease of the rate of change in winter. Rate of change was delayed density-dependent. The delayed density-dependence had an 8 month time-lag in the summers and a 4 month time-lag in the winters relative to the density in previous autumns and springs, respectively. These findings suggest that vole cycles are likely to be generated by a time-lag mechanism. On theoretical grounds, it has been found that a delayed density- dependence of population growth rate with a 9 month time-lag caused stable limit cycles with a period between 3 and 4 years. Some mechanisms for the delayed density-dependence are suggested and discussed. The mechanisms are assumed to be related to remaining effects of vole populations past interactions with predators, food supplies, and/or diseases.

    Unlike the other voles, the bank vole had regular and distinct seasonal declines in density over winter. These declines are proposed to be due to predation, mainly by Tengmalm's owl. Supranivean foraging for epiphytic tree lichens and conifer seeds most likely explains why this species was frequently taken by the owl under snow-rich conditions.

    The alternative prey hypothesis predicts that a reduction of predator numbers should increase the number of alternative prey. Alternative prey should be less effectively synchronized to the vole cycle by predation at declining and low vole (main prey) densities; they may also lose their 3-4 year cyclicity. The appearance of sarcoptic mange among foxes in northern Sweden in the mid 1970s provided an opportunity to "test" these ideas, and these were found to be supported. In areas with highest mange infection rates, foxes declined markedly from the late 1970s to mid 1980s, whereas hare numbers rose rapidly and appeared non-cyclic.

  • 12.
    Hörnfeldt, Birger
    et al.
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
    Christensen, Pernilla
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
    Sandström, Per
    Ecke, Fraucke
    Long-term decline and local extinction of Clethrionomys rufocanus in boreal Sweden2006Ingår i: Landscape Ecology, ISSN 0921-2973, E-ISSN 1572-9761, Vol. 21, s. 1135-1150Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Over the past three decades in boreal Sweden, there has been a long-term decline of cyclic sympatric voles,leading to local extinctions of the most affected species, the grey-sided vole (Clethrionomys rufocanus). Wemonitored this decline by snap-trapping on 58 permanent plots spread over 100 km2 in spring and fall from fall1971–2003. The reason for the decline is largely unknown, although a common major factor is likely to beinvolved in the decline of C. rufocanus and of the coexisting voles.However, here we deal with the reasonabilityof one complementary hypothesis, the habitat fragmentation hypothesis, which assumes that part of thedecline of C. rufocanus is caused by habitat (forest) destruction. There was considerable local variation in thedecline among the 58 1-ha sampling plots, with respect to both density and timing of the decline; however, alldeclines ended up with local extinction almost without exception. Local declines were not associated withhabitat destruction by clear-cutting within sampling-plots, as declines started about equally often before asafter clear-cutting, which suggested that habitat destruction outside sampling plots could be involved. In amultiple regression analysis, local habitat preference (LHP; expressed as a ratio of observed to expectednumber of voles trapped per habitat) together with two habitat variables in the surrounding (2.5 · 2.5 km2)landscape matrix explained56%of the variation among local cumulated densities of C. rufocanus and hence oflocal time-series.LHPwas positively correlated and explained31%of the variation, while connectivity amongclear-cuts was negatively correlated and proximity among xeric-mesic mires was positively correlated andexplained additional 16% and 9%, respectively. Even if the overall decline cannot be connected to local clearcuttingon sampling-plots, clear-cutting and hence habitat fragmentation/destruction in the surroundinglandscapes potentially influenced grey-sided vole numbers negatively.

  • 13.
    Hörnfeldt, Birger
    et al.
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Ekologi, miljö och geovetenskap.
    Hipkiss, Tim
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Ekologi, miljö och geovetenskap.
    Eklund, Ulf
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Ekologi, miljö och geovetenskap.
    Fading out of vole and predator cycles?2005Ingår i: Proc Biol Sci, ISSN 0962-8452, Vol. 272, nr 1576, s. 2045-9Artikel i tidskrift (Refereegranskat)
  • 14. Khalil, Hussein
    et al.
    Hörnfeldt, Birger
    Evander, Magnus
    Umeå universitet, Medicinska fakulteten, Institutionen för klinisk mikrobiologi, Virologi.
    Magnusson, Magnus
    Olsson, Gert
    Ecke, Frauke
    Dynamics and Drivers of Hantavirus Prevalence in Rodent Populations2014Ingår i: Vector Borne and Zoonotic Diseases, ISSN 1530-3667, E-ISSN 1557-7759, Vol. 14, nr 8, s. 537-551Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    Human encroachment on wildlife habitats has contributed to the emergence of several zoonoses. Pathogenic hantaviruses are hosted by rodents and cause severe diseases in the Americas and Eurasia. We reviewed several factors that potentially drive prevalence (the proportion of infected rodents) in host populations. These include demography, behavior, host density, small mammal diversity, predation, and habitat and landscape characteristics. This review is the first to include a quantitative summary of the literature investigating hantavirus prevalence in rodents. Demographic structure and density were investigated the most and predation the least. Reported effects of demographic structure and small mammal diversity were consistent, whereby reproductive males were most likely to be infected and prevalence decreased with small mammal diversity. The influences of habitat and landscape properties are often complex and indirect. The relationship between density and prevalence merits more investigation. Most hantavirus hosts are habitat generalists and their control is challenging. Incorporating all potential factors and their interactions is essential to understanding and controlling infection in host populations.

  • 15. Khalil, Hussein
    et al.
    Olsson, Gert
    Ecke, Frauke
    Evander, Magnus
    Umeå universitet, Medicinska fakulteten, Institutionen för klinisk mikrobiologi, Virologi.
    Hjertqvist, Marika
    Magnusson, Magnus
    Löfvenius, Mikaell Ottosson
    Hörnfeldt, Birger
    The importance of bank vole density and rainy winters in predicting nephropathia epidemica incidence in Northern Sweden.2014Ingår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 9, nr 11, artikel-id e111663Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Pathogenic hantaviruses (family Bunyaviridae, genus Hantavirus) are rodent-borne viruses causing hemorrhagic fever with renal syndrome (HFRS) in Eurasia. In Europe, there are more than 10,000 yearly cases of nephropathia epidemica (NE), a mild form of HFRS caused by Puumala virus (PUUV). The common and widely distributed bank vole (Myodes glareolus) is the host of PUUV. In this study, we aim to explain and predict NE incidence in boreal Sweden using bank vole densities. We tested whether the number of rainy days in winter contributed to variation in NE incidence. We forecast NE incidence in July 2013-June 2014 using projected autumn vole density, and then considering two climatic scenarios: 1) rain-free winter and 2) winter with many rainy days. Autumn vole density was a strong explanatory variable of NE incidence in boreal Sweden in 1990-2012 (R2 = 79%, p<0.001). Adding the number of rainy winter days improved the model (R2 = 84%, p<0.05). We report for the first time that risk of NE is higher in winters with many rainy days. Rain on snow and ground icing may block vole access to subnivean space. Seeking refuge from adverse conditions and shelter from predators, voles may infest buildings, increasing infection risk. In a rainy winter scenario, we predicted 812 NE cases in boreal Sweden, triple the number of cases predicted in a rain-free winter in 2013/2014. Our model enables identification of high risk years when preparedness in the public health sector is crucial, as a rainy winter would accentuate risk.

  • 16. Niklasson, B
    et al.
    Samsioe, A
    Papadogiannakis, N
    Kawecki, A
    Hörnfeldt, Birger
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Ekologi, miljö och geovetenskap.
    Saade, G R
    Klitz, W
    Association of zoonotic Ljungan virus with intrauterine fetal deaths2007Ingår i: Birth Defects Res (Part A), Vol. 79, s. 488-493Artikel i tidskrift (Refereegranskat)
  • 17. Niklasson, Bo
    et al.
    Nyholm, Erik
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Ekologi, miljö och geovetenskap.
    Feinstein, Ricardo E
    Samsioe, Annika
    Hörnfeldt, Birger
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Ekologi, miljö och geovetenskap.
    Diabetes and myocarditis in voles and lemmings at cyclic peak densities--induced by Ljungan virus?2006Ingår i: Oecologia, ISSN 0029-8549, Vol. 150, nr 1, s. 1-7Artikel i tidskrift (Refereegranskat)
  • 18. Niklasson, Bo
    et al.
    Råsten Almqvist, Petra
    Hörnfeldt, Birger
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
    Klitz, William
    Sudden infant death syndrome and Ljungan virus2009Ingår i: Forensic Science, Medicine, and Pathology, ISSN 1547-769X, E-ISSN 1556-2891, Vol. 5, nr 4, s. 274-279Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Ljungan virus (LV) has recently been associated with perinatal death in its natural rodent reservoir and also with developmental disorders of reproduction in laboratory mice. A strong epidemiological association has been found between small rodent abundance in Sweden and the incidence of intrauterine fetal death (IUFD) in humans. LV antigen has been detected in half of the IUFD cases tested. The question was therefore raised whether sudden infant death syndrome (SIDS) might be associated with rodent abundance, and whether the virus is present in cases of SIDS. Variation in the incidence of SIDS using the Swedish cause-of-death database tracked the changes in the population fluctuations of native rodents. Formalin-fixed tissues from the brain, heart, and lung were investigated from cases of SIDS, SIDS with lymphocytic infiltration of the myocardium (myocarditis) and myocarditis cases using LV specific immunohistochemistry (IHC). Ljungan virus was detected in the brain, heart, and lung tissue from all three of the patient categories investigated using IHC. These studies suggest that LV may play a prominent role in infant death, and that IUFD and SIDS may have common etiological underpinnings.

  • 19. Olsson , GE
    et al.
    Hjertqvist , M
    Lundkvist , Å
    Hörnfeldt , Birger
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Ekologi, miljö och geovetenskap.
    Predicting High Risk for Human Hantavirus Infections, Sweden2009Ingår i: Emerging Infectious Diseases, ISSN 1080-6040, E-ISSN 1080-6059, Vol. 15, nr 1, s. 104-106Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An increased risk for hemorrhagic fever with renal syndrome caused by Puumala hantavirus was forecast for Sweden in 2007. The forecast was based on a predicted increase in the number of Myodes glareolus rodents (reservoir hosts). Despite raised awareness and preparedness, the number of human cases during July 2007-June 2008 was 1,483, a new high.

  • 20.
    Olsson, Gert E
    et al.
    Umeå universitet, Medicinska fakulteten, Institutionen för klinisk mikrobiologi, Virologi.
    Dalerum, Fredrik
    Hörnfeldt, Birger
    Elgh, Fredrik
    Umeå universitet, Medicinska fakulteten, Institutionen för klinisk mikrobiologi, Virologi.
    Palo, Thomas R
    Juto, Per
    Umeå universitet, Medicinska fakulteten, Institutionen för klinisk mikrobiologi, Virologi.
    Ahlm, Clas
    Human hantavirus infections, Sweden.2003Ingår i: Emerging Infectious Diseases, ISSN 1080-6040, E-ISSN 1080-6059, Vol. 9, nr 11, s. 1395-401Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The prevalent human hantavirus disease in Sweden is nephropathia epidemica, which is caused by Puumala virus and shed by infected bank voles (Clethrionomys glareolus). To evaluate temporal and spatial patterns of this disease, we studied 2,468 reported cases from a highly disease-endemic region in northern Sweden. We found that, in particular, middle-aged men living in rural dwellings near coastal areas were overrepresented. The case-patients were most often infected in late autumn, when engaged in activities near or within manmade rodent refuges. Of 862 case-patients confident about the site of virus exposure, 50% were concentrated within 5% of the study area. The incidence of nephropathia epidemica was significantly correlated with bank vole numbers within monitored rodent populations in part of the region. Understanding this relationship may help forestall future human hantavirus outbreaks.

  • 21. Rodushkin, Ilia
    et al.
    Engstrom, Emma
    Sorlin, Dieke
    Baxter, Douglas
    Hörnfeldt, Birger
    Nyholm, Erik
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
    Ecke, Frauke
    Uptake and Accumulation of Anthropogenic Os in Free-Living Bank Voles (Myodes glareolus)2011Ingår i: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 218, nr 1-4, s. 603-610Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Osmium tetroxide (OsO4) is one of the most toxic air contaminants but its environmental effects are poorly understood. Here, for the first time, we present evidence of osmium uptake in a common herbivore (bank vole, Myodes glareolus) in boreal forests of northern Sweden. Voles (n = 22) and fruticose arboreal pendular lichens, the potential main winter food source of the vole, were collected along a spatial gradient to the west of a steelwork in Tornio, Finland at the Finnish-Swedish border. Os-187/Os-188 isotope ratios increased and osmium concentrations decreased in lichens and voles along the gradient. Osmium concentrations in lichens were 10,000-fold higher than those in voles. Closest to the steelwork, concentrations were highest in kidneys rather than skin/fur that are directly exposed to airborne OsO4. The kidney-to-body weight ratio was higher at the two localities close to the steelwork. Even though based on a small sample size, our results for the first time demonstrate that osmium is taken up, partitioned, and accumulated in mammal tissue, and indicate that high kidney-to-body weight ratios might be induced by anthropogenic osmium.

  • 22. Samsioe, Annika
    et al.
    Feinstein, Ricardo
    Saade, George
    Sjöholm, Ake
    Hörnfeldt, Birger
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Ekologi, miljö och geovetenskap.
    Fundele, Reinald
    Klitz, William
    Niklasson, Bo
    Intrauterine death, fetal malformation, and delayed pregnancy in Ljungan virus-infected mice.2006Ingår i: Birth Defects Res B Dev Reprod Toxicol, ISSN 1542-9733, Vol. 77, nr 4, s. 251-6Artikel i tidskrift (Refereegranskat)
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