Jörn Gessner

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Sturgeon species are among the commercially most valuable and the most endangered groups of fish. To assess the existing literature published within the field of sturgeon research over the past 15 years (1996–2010) we applied a bibliometric approach, in order to identify patterns and trends of the published research in this field. The analysis was performed(More)
Data Deficient species (DD) comprise a significant portion of the total number of species listed within the IUCN Red List. Although they are not classified within one of the threat categories, they may still face high extinction risks. However, due to limited data available to infer their extinction risk reliably, it is unlikely that the assessment of the(More)
In conservation science, assessments of trends and priorities for actions often focus on species as the management unit. Studies on species coverage in online media are commonly conducted by using species vernacular names. However, the use of species vernacular names for web-based data search is problematic due to the high risk of mismatches in results.(More)
Population models in fish represent one of the major scientific approaches to identify and bridge existing gaps in the understanding of the ecology and life history, as well as to support management. In general, the more complex the models get, the more they are restricted to a case-by-case basis for particular, well-studied species, because demographic(More)
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