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- Böhm, M., et al.
(författare)
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The conservation status of the world’s freshwater molluscs
- 2021
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Ingår i: Hydrobiologia. - : Springer Science and Business Media LLC. - 0018-8158 .- 1573-5117. ; 848, s. 3231-3254
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Tidskriftsartikel (refereegranskat)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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| 2. |
- Kågström, Bo, et al.
(författare)
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Blocked Algorithms For the Reduction to Hessenberg-Triangular Form Revisited
- 2008
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Ingår i: BIT Numerical Mathematics. ; 48:3, s. 563-584
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Tidskriftsartikel (refereegranskat)abstract
- We present two variants of Moler and Stewart's algorithm for reducing a matrix pair to Hessenberg-triangular (HT) form with increased data locality in the access to the matrices. In one of these variants, a careful reorganization and accumulation of Givens rotations enables the use of efficient level 3 BLAS. Experimental results on four different architectures, representative of current high performance processors, compare the performances of the new variants with those of the implementation of Moler and Stewart's algorithm in subroutine DGGHRD from LAPACK, Dackland and Kagstrom's two-stage algorithm for the HT form, and a modified version of the latter which requires considerably less flops.
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| 3. |
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| 4. |
- Machado, Carla G., et al.
(författare)
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Implementation of a knowledge management program and its impact on the management system : Case study at an industrial company
- 2010
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Konferensbidrag (refereegranskat)abstract
- The business and management environment is influenced by political, organizational, institutional, technological, economic and social phenomena of a global scope. Thus, capturing, registering, organizing and disseminating information and knowledge plays a strategic role in organizations. The objective of this paper is to present a case study of an organization that is developing a Knowledge Management project, analyzing its initiative in order to classify the stage at which the company’s knowledge management cycle is at and to relate this cycle to other management instruments it has. The following instruments were used to raise and collect data: individual interviews and bibliographic study. This paper represents an important contribution to the study of knowledge management, demonstrating new technologies that can leverage organizational change and trigger a new understanding of Knowledge Management.
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