Ole Hamann

896 total citations
19 papers, 572 citations indexed

About

Ole Hamann is a scholar working on Plant Science, Ecology, Evolution, Behavior and Systematics and Ecology. According to data from OpenAlex, Ole Hamann has authored 19 papers receiving a total of 572 indexed citations (citations by other indexed papers that have themselves been cited), including 5 papers in Plant Science, 4 papers in Ecology, Evolution, Behavior and Systematics and 4 papers in Ecology. Recurrent topics in Ole Hamann's work include Plant and animal studies (3 papers), Aging, Elder Care, and Social Issues (2 papers) and Health, Medicine and Society (2 papers). Ole Hamann is often cited by papers focused on Plant and animal studies (3 papers), Aging, Elder Care, and Social Issues (2 papers) and Health, Medicine and Society (2 papers). Ole Hamann collaborates with scholars based in Denmark, Switzerland and United Kingdom. Ole Hamann's co-authors include Lloyd L. Loope, Charles P. Stone, R. E. Brockie, Michael B. Usher, Søren Wium‐Andersen, Alan Tye, M. Dolores Lledó, Alain Vanderpoorten, Jennifer L. Trusty and Michael Kiehn and has published in prestigious journals such as BioScience, Biological Conservation and Biodiversity and Conservation.

In The Last Decade

Ole Hamann

17 papers receiving 488 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Ole Hamann Denmark	11	250	245	223	143	81	19	572
Maj De Poorter New Zealand	8	142 0.6×	324 1.3×	164 0.7×	80 0.6×	85 1.0×	11	559
DJ Coates Australia	15	232 0.9×	194 0.8×	160 0.7×	240 1.7×	296 3.7×	18	658
George Gibbs New Zealand	16	385 1.5×	230 0.9×	213 1.0×	99 0.7×	209 2.6×	29	682
Ian A.E. Atkinson New Zealand	8	164 0.7×	751 3.1×	277 1.2×	59 0.4×	223 2.8×	11	919
Heinke Jäger Ecuador	10	170 0.7×	153 0.6×	158 0.7×	104 0.7×	38 0.5×	23	439
Katrine Eldegard Norway	17	370 1.5×	367 1.5×	212 1.0×	119 0.8×	96 1.2×	47	676
Shyama Pagad New Zealand	10	201 0.8×	369 1.5×	210 0.9×	97 0.7×	78 1.0×	12	669
Frank R. Lambert United Kingdom	13	377 1.5×	486 2.0×	498 2.2×	140 1.0×	85 1.0×	31	899
Sankarsan Roy India	4	174 0.7×	666 2.7×	300 1.3×	119 0.8×	189 2.3×	17	954
Sven‐Axel Bengtson Sweden	15	221 0.9×	472 1.9×	204 0.9×	36 0.3×	65 0.8×	45	636

Countries citing papers authored by Ole Hamann

Since Specialization

Citations

This map shows the geographic impact of Ole Hamann'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 Ole Hamann with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Ole Hamann more than expected).

Fields of papers citing papers by Ole Hamann

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Ole Hamann. 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 Ole Hamann. The network helps show where Ole Hamann may publish in the future.

Co-authorship network of co-authors of Ole Hamann

This figure shows the co-authorship network connecting the top 25 collaborators of Ole Hamann. A scholar is included among the top collaborators of Ole Hamann 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 Ole Hamann. Ole Hamann is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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19 of 19 papers shown

Hamann, Ole. (2021). Plants introduced into Galapagos - not by man, but by EI Niño?. AquaDocs (United Nations Educational, Scientific and Cultural Organization). 1 indexed citations

Hamann, Ole, et al.. (2021). Vegetation regrowth on Isla Pinta : a success story. AquaDocs (United Nations Educational, Scientific and Cultural Organization).

Bramwell, David, Paula Posadas, Sterling C. Keeley, et al.. (2011). The Biology of Island Floras. Cambridge University Press eBooks. 66 indexed citations

Hamann, Ole. (2003). Vietation changes over three decades on Santa Fe Island, Galhpagos, Ecuador. Nordic Journal of Botany. 23(1). 143–152. 17 indexed citations

Hamann, Ole. (2001). Demographic studies of three indigenous stand-forming plant taxa (Scalesia, Opuntia, and Bursera) in the Galápagos Islands, Ecuador. Biodiversity and Conservation. 10(2). 223–250. 37 indexed citations

Hamann, Ole. (1995). Vegetationsveränderungen und Naturschutz. Research at the University of Copenhagen (University of Copenhagen). 8(44). 14–17. 1 indexed citations

Hamann, Ole. (1993). The vegetation of Isla Santiago : past and present. AquaDocs (United Nations Educational, Scientific and Cultural Organization). 6 indexed citations

Hamann, Ole. (1993). On vegetation recovery, goats and giant tortoises on Pinta Island, Gal�pagos, Ecuador. Biodiversity and Conservation. 2(2). 138–151. 48 indexed citations

Schofield, Eileen K., et al.. (1991). Botanical Research and Management in Galapagos.. Bulletin of the Torrey Botanical Club. 118(1). 88–88. 6 indexed citations

10.

Lawesson, Jonas E., et al.. (1991). Botanical Research and Management in Galapagos.. Brittonia. 43(2). 127–127. 8 indexed citations

11.

Brockie, R. E., Lloyd L. Loope, Michael B. Usher, & Ole Hamann. (1988). Biological invasions of island nature reserves. Biological Conservation. 44(1-2). 9–36. 98 indexed citations

12.

Loope, Lloyd L., Ole Hamann, & Charles P. Stone. (1988). Comparative Conservation Biology of Oceanic Archipelagoes: Hawaii and the Galápagos. BioScience. 38(4). 272–282. 109 indexed citations

13.

Hamann, Ole & Søren Wium‐Andersen. (1986). Scalesia gordilloi sp. nov. (Asteraceae) from the Galápagos Islands, Ecuador. Nordic Journal of Botany. 6(1). 35–38. 11 indexed citations

14.

Hamann, Ole. (1985). The IUCN/WWF Plants Conservation Programme 1984–85. Vegetatio. 60(3). 147–149. 3 indexed citations

15.

Hamann, Ole. (1985). Announcement. Biological Conservation. 33(4). 383–386. 1 indexed citations

16.

Hamann, Ole. (1979). On Climatic Conditions, Vegetation Types, and Leaf Size in the Galapagos Islands. Biotropica. 11(2). 101–101. 58 indexed citations

17.

Hamann, Ole. (1979). Dynamics of a stand of Scalesia pedunculata Hooker fil., Santa Cruz Island, Galápagos. Botanical Journal of the Linnean Society. 78(2). 67–84. 18 indexed citations

18.

Hamann, Ole. (1979). Regeneration of vegetation on Santa Fé and Pinta islands, Galápagos, after the eradication of goats. Biological Conservation. 15(3). 215–235. 45 indexed citations

19.

Hamann, Ole. (1975). Vegetational changes in the Galápagos Islands during the period 1966–1973. Biological Conservation. 7(1). 37–59. 39 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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