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Träfflista för sökning "WFRF:(Pollock C.) "

Search: WFRF:(Pollock C.)

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  • Böhm, M., et al. (author)
  • The conservation status of the world’s freshwater molluscs
  • 2021
  • In: Hydrobiologia. - : Springer Science and Business Media LLC. - 0018-8158 .- 1573-5117. ; 848, s. 3231-3254
  • Journal article (peer-reviewed)abstract
    • With the biodiversity crisis continuing unchecked, we need to establish levels and drivers of extinction risk, and reassessments over time, to effectively allocate conservation resources and track progress towards global conservation targets. Given that threat appears particularly high in freshwaters, we assessed the extinction risk of 1428 randomly selected freshwater molluscs using the IUCN Red List Categories and Criteria, as part of the Sampled Red List Index project. We show that close to one-third of species in our sample are estimated to be threatened with extinction, with highest levels of threat in the Nearctic, Palearctic and Australasia and among gastropods. Threat levels were higher in lotic than lentic systems. Pollution (chemical and physical) and the modification of natural systems (e.g. through damming and water abstraction) were the most frequently reported threats to freshwater molluscs, with some regional variation. Given that we found little spatial congruence between species richness patterns of freshwater molluscs and other freshwater taxa, apart from crayfish, new additional conservation priority areas emerged from our study. We discuss the implications of our findings for freshwater mollusc conservation, the adequacy of a sampled approach and important next steps to estimate trends in freshwater mollusc extinction risk over time. © 2020, Springer Nature Switzerland AG.
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  • Fadanelli, S., et al. (author)
  • Four-Spacecraft Measurements of the Shape and Dimensionality of Magnetic Structures in the Near-Earth Plasma Environment
  • 2019
  • In: Journal of Geophysical Research - Space Physics. - 2169-9380 .- 2169-9402. ; 124:8, s. 6850-6868
  • Journal article (peer-reviewed)abstract
    • We present a new method for determining the main relevant features of the local magnetic field configuration, based entirely on the knowledge of the magnetic field gradient four‐spacecraft measurements. The method, named “magnetic configuration analysis” (MCA), estimates the spatial scales on which the magnetic field varies locally. While it directly derives from the well‐known magnetic directional derivative and magnetic rotational analysis procedures (Shi et al., 2005, htpps://doi.org/10.1029/2005GL022454; Shen et al., 2007, https://doi.org/10.1029/2005JA011584), MCA was specifically designed to address the actual magnetic field geometry. By applying MCA to multispacecraft data from the Magnetospheric Multiscale (MMS) satellites, we perform both case and statistical analyses of local magnetic field shape and dimensionality at very high cadence and small scales. We apply this technique to different near‐Earth environments and define a classification scheme for the type of configuration observed. While our case studies allow us to benchmark the method with those used in past works, our statistical analysis unveils the typical shape of magnetic configurations and their statistical distributions. We show that small‐scale magnetic configurations are generally elongated, displaying forms of cigar and blade shapes, but occasionally being planar in shape like thin pancakes (mostly inside current sheets). Magnetic configurations, however, rarely show isotropy in their magnetic variance. The planar nature of magnetic configurations and, most importantly, their scale lengths strongly depend on the plasma β parameter. Finally, the most invariant direction is statistically aligned with the electric current, reminiscent of the importance of electromagnetic forces in shaping the local magnetic configuration.
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  • Result 1-10 of 129
Type of publication
journal article (113)
conference paper (12)
research review (4)
Type of content
peer-reviewed (116)
other academic/artistic (13)
Author/Editor
Ergun, R. E. (60)
Russell, C. T. (60)
Torbert, R. B. (58)
Giles, B. L. (54)
Burch, J. L. (52)
Lindqvist, Per-Arne (51)
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Strangeway, R. J. (49)
Pollock, C. J. (48)
Gershman, D. J. (45)
Pollock, C. (45)
Lavraud, B. (44)
Khotyaintsev, Yuri V ... (42)
Dorelli, J. C. (32)
Saito, Y. (30)
Magnes, W. (30)
Paterson, W. R. (28)
Le Contel, O. (27)
Avanov, L. A. (25)
Wilder, F. D. (23)
Moore, T. E. (23)
Nakamura, R. (19)
Graham, Daniel B. (19)
Phan, T. D. (19)
Chen, L. -J (18)
Khotyaintsev, Yuri (17)
Argall, M. R. (17)
Fuselier, S. A. (17)
Carrero, JJ (16)
Khotyaintsev, Yu. V. (16)
Eastwood, J. P. (16)
Wang, S (15)
Plaschke, F. (15)
Goodrich, K. A. (15)
Avanov, L. (15)
James, G (13)
Vaivads, Andris (13)
Marklund, Göran (13)
Burch, J. (13)
Pecoits, R (13)
Retino, A. (12)
Sanchez, JJG (12)
Paterson, W. (12)
Dorelli, J. (11)
Shay, M. A. (11)
Wheeler, DC (11)
Norgren, Cecilia (10)
Giles, B. (10)
Hesse, M (10)
Cassak, P. A. (10)
Schwartz, S. J. (10)
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University
Uppsala University (76)
Royal Institute of Technology (59)
Karolinska Institutet (39)
Lund University (4)
University of Gothenburg (2)
Stockholm University (2)
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University of Gävle (2)
Linköping University (1)
Mid Sweden University (1)
Chalmers University of Technology (1)
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Language
English (129)
Research subject (UKÄ/SCB)
Natural sciences (81)
Medical and Health Sciences (16)

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