J. Hartmann

404 total citations
15 papers, 328 citations indexed

About

J. Hartmann is a scholar working on Nature and Landscape Conservation, Ecology and Environmental Chemistry. According to data from OpenAlex, J. Hartmann has authored 15 papers receiving a total of 328 indexed citations (citations by other indexed papers that have themselves been cited), including 12 papers in Nature and Landscape Conservation, 7 papers in Ecology and 7 papers in Environmental Chemistry. Recurrent topics in J. Hartmann's work include Fish Ecology and Management Studies (12 papers), Aquatic Ecosystems and Phytoplankton Dynamics (7 papers) and Aquatic Invertebrate Ecology and Behavior (4 papers). J. Hartmann is often cited by papers focused on Fish Ecology and Management Studies (12 papers), Aquatic Ecosystems and Phytoplankton Dynamics (7 papers) and Aquatic Invertebrate Ecology and Behavior (4 papers). J. Hartmann collaborates with scholars based in Germany. J. Hartmann's co-authors include M. G. Johnson, J. R. M. Kelso, J. H. Leach and Reiner Eckmann and has published in prestigious journals such as Journal of Fish Biology, ICES Journal of Marine Science and Journal of Evolutionary Biology.

In The Last Decade

J. Hartmann

15 papers receiving 250 citations

Peers

J. Hartmann

NLC

ECOLO

EC

GPC

AS

Ralph M. Stedman United States

Jimmy D. Winter United States

Donald V. Rottiers United States

J. Douglas Oliver United States

Carl M. Way United States

Jeffrey D. Holuszko United States

Michael L. Toneys United States

Melissa T. Drake United States

Michael D. Clady United States

D. J. Russell Australia

Ralph M. Stedman United States

J. Hartmann

287 ×1.1

NLC

213 ×1.2

ECOLO

27 ×0.2

EC

101 ×1.0

GPC

114 ×1.2

AS

Citations per year, relative to J. Hartmann J. Hartmann (= 1×) peers Ralph M. Stedman

Countries citing papers authored by J. Hartmann

Since Specialization

Citations

This map shows the geographic impact of J. Hartmann's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by J. Hartmann with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites J. Hartmann more than expected).

Fields of papers citing papers by J. Hartmann

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by J. Hartmann. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by J. Hartmann. The network helps show where J. Hartmann may publish in the future.

Co-authorship network of co-authors of J. Hartmann

This figure shows the co-authorship network connecting the top 25 collaborators of J. Hartmann. A scholar is included among the top collaborators of J. Hartmann based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with J. Hartmann. J. Hartmann is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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15 of 15 papers shown

1.

Hartmann, J., et al.. (2008). Human‐induced changes in the reproductive traits of Lake Constance common whitefish (Coregonus lavaretus). Journal of Evolutionary Biology. 22(1). 88–96. 29 indexed citations

2.

Hartmann, J., et al.. (1995). Divergent distributions of prey and predator, a fishing effect?. Aquatic Sciences. 57(2). 106–118. 2 indexed citations

3.

Hartmann, J., et al.. (1993). Fecundity of whitefish (Coregonus lavaretus) during the eu‐and oligotrophication of Lake Constance. Journal of Fish Biology. 43(1). 81–87. 13 indexed citations

4.

Hartmann, J.. (1987). Whitefish as indicators of cultural eutrophication?. Aquatic Sciences. 49(3). 343–352. 7 indexed citations

5.

Hartmann, J.. (1984). 11-year cycle of spawning time and growth of the whitefish (Coregonus lavaretus) of Lake Constance. Aquatic Sciences. 46(1). 163–170. 6 indexed citations

6.

Hartmann, J.. (1983). Charr as Indicators of Pollution. Fisheries. 8(6). 10–12. 10 indexed citations

7.

Hartmann, J.. (1982). Hierarchy of niches of the fishes of Lake Constance, a lake undergoing eutrophication. Aquatic Sciences. 44(2). 315–323. 5 indexed citations

8.

Hartmann, J.. (1979). Unterschiedliche Adaptionsfähigkeit der Fische an Eutrophierung. Aquatic Sciences. 41(2). 374–382. 9 indexed citations

9.

Hartmann, J.. (1978). Fischwachstum bei Oligo-, Meso- und Eutrophie des Bodensees. Aquatic Sciences. 40(1). 32–39. 5 indexed citations

10.

Hartmann, J.. (1977). Fischereiliche Veränderungen in kulturbedingt eutrophierenden Seen. Aquatic Sciences. 39(2). 243–254. 56 indexed citations

11.

Leach, J. H., et al.. (1977). Responses of Percid Fishes and Their Habitats to Eutrophication. Journal of the Fisheries Research Board of Canada. 34(10). 1964–1971. 102 indexed citations

12.

Hartmann, J., et al.. (1977). Percids of Lake Constance, a Lake Undergoing Eutrophication. Journal of the Fisheries Research Board of Canada. 34(10). 1670–1677. 74 indexed citations

13.

Hartmann, J.. (1976). Der Jahresgang von Neuston im Golf von Neapel. Internationale Revue der gesamten Hydrobiologie und Hydrographie. 61(6). 825–840. 2 indexed citations

14.

Hartmann, J.. (1972). Behaviour of Neuston in an Aquarium. Internationale Revue der gesamten Hydrobiologie und Hydrographie. 57(4). 559–571. 2 indexed citations

15.

Hartmann, J.. (1970). Juvenile Saury Pike (Scomberesox Saurus Walb.), an Example of Ichthyoneuston. ICES Journal of Marine Science. 33(2). 245–255. 6 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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