Sjirk Geerts

1.5k total citations
64 papers, 987 citations indexed

About

Sjirk Geerts is a scholar working on Ecology, Evolution, Behavior and Systematics, Nature and Landscape Conservation and Plant Science. According to data from OpenAlex, Sjirk Geerts has authored 64 papers receiving a total of 987 indexed citations (citations by other indexed papers that have themselves been cited), including 44 papers in Ecology, Evolution, Behavior and Systematics, 42 papers in Nature and Landscape Conservation and 34 papers in Plant Science. Recurrent topics in Sjirk Geerts's work include Ecology and Vegetation Dynamics Studies (42 papers), Plant and animal studies (40 papers) and Plant Parasitism and Resistance (27 papers). Sjirk Geerts is often cited by papers focused on Ecology and Vegetation Dynamics Studies (42 papers), Plant and animal studies (40 papers) and Plant Parasitism and Resistance (27 papers). Sjirk Geerts collaborates with scholars based in South Africa, Australia and United States. Sjirk Geerts's co-authors include Anton Pauw, David M. Richardson, John R. Wilson, Desika Moodley, Mirijam Gaertner, Vernon Visser, Opeyemi Adedoja, Mlungele M. Nsikani, Sheunesu Ruwanza and Sabrina Kumschick and has published in prestigious journals such as SHILAP Revista de lepidopterología, PLoS ONE and Journal of Environmental Management.

In The Last Decade

Sjirk Geerts

59 papers receiving 962 citations

Peers

Sjirk Geerts
Miguel A. Munguía‐Rosas Mexico
Keenan M. L. Mack United States
Stefan Abrahamczyk Germany
Christiane N. Weiner Germany
Alejandro Flores‐Palacios Mexico
Elizabeth G. Pringle United States
Anne Kempel Switzerland
Petr Dostál Czechia
Jeferson Vizentin‐Bugoni Brazil
Patrick Hoehn Germany
Miguel A. Munguía‐Rosas Mexico
Sjirk Geerts
Citations per year, relative to Sjirk Geerts Sjirk Geerts (= 1×) peers Miguel A. Munguía‐Rosas

Countries citing papers authored by Sjirk Geerts

Since Specialization
Citations

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

Fields of papers citing papers by Sjirk Geerts

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Sjirk Geerts

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

All Works

20 of 20 papers shown
1.
Geerts, Sjirk, et al.. (2025). Post-fire flowering enhances pollinator visitation and may reduce florivory and nectar robbing in sunbird-pollinated plants. South African Journal of Botany. 186. 201–211.
2.
Geerts, Sjirk. (2025). The genus Cyclopia (honeybush) in South Africa: A scientometric assessment of research trends. South African Journal of Botany. 184. 257–262.
3.
Geerts, Sjirk & Johannes J. Le Roux. (2025). Below- and above-ground mutualisms impact two alien brooms in South Africa differently. Biological Invasions. 27(4).
4.
Nsikani, Mlungele M. & Sjirk Geerts. (2024). Enhancing invasive alien plant eradication outcomes: Lessons learned from South Africa. African Journal of Ecology. 62(3). 2 indexed citations
5.
Kumschick, Sabrina, et al.. (2024). Regulatory options for cultivars and hybrids of invasive plant species—the South African experience. Invasive Plant Science and Management. 17(3). 228–238.
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Geerts, Sjirk, et al.. (2024). Impacts of Supplemental Feeding on Sunbird-Pollination Systems in Young Fynbos Varies with Floral Abundance. Environmental Management. 75(4). 906–917.
8.
Adedoja, Opeyemi, et al.. (2024). Moving with your mutualist: Predicted climate‐induced mismatch between Proteaceae species and their avian pollinators. Journal of Biogeography. 51(6). 992–1003. 1 indexed citations
9.
Kraaij, Tineke, et al.. (2024). Seed banks and post‐fire recovery of invasive alien Metrosideros excelsa in South Africa: Implications for control. Austral Ecology. 49(5). 1 indexed citations
10.
Geerts, Sjirk, et al.. (2023). Spatial and temporal patterns in wildlife tourism encounters and how people feel about them based on social media data from South Africa. Journal of Outdoor Recreation and Tourism. 44. 100642–100642. 8 indexed citations
11.
Geerts, Sjirk, et al.. (2023). Weak latitudinal trends in reproductive traits of Afromontane forest trees. Annals of Botany. 133(5-6). 711–724. 5 indexed citations
12.
Podest, E., et al.. (2023). Mapping Invasive Herbaceous Plant Species with Sentinel-2 Satellite Imagery: Echium plantagineum in a Mediterranean Shrubland as a Case Study. SHILAP Revista de lepidopterología. 3(2). 328–344. 5 indexed citations
13.
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Adedoja, Opeyemi, et al.. (2021). Mixed effect of habitat fragmentation on pollinator visitation rates but not on seed production in renosterveld of South Africa. South African Journal of Botany. 146. 48–57. 5 indexed citations
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Kumschick, Sabrina, et al.. (2020). Identifying safe cultivars of invasive plants: six questions for risk assessment, management, and communication. NeoBiota. 62. 81–97. 8 indexed citations
17.
Visser, J.H., Sjirk Geerts, & Bettine Jansen van Vuuren. (2020). Phylogeographic Patterns in a Semi-Lithophilous Burrowing Scorpion, Opistophthalmus pallipes, from South Africa. ZOOLOGICAL SCIENCE. 38(1). 36–44. 4 indexed citations
18.
Novoa, Ana, Ross T. Shackleton, Susan Canavan, et al.. (2017). A framework for engaging stakeholders on the management of alien species. Journal of Environmental Management. 205. 286–297. 131 indexed citations
19.
Moodley, Desika, Sjirk Geerts, David M. Richardson, & John R. Wilson. (2013). Different Traits Determine Introduction, Naturalization and Invasion Success In Woody Plants: Proteaceae as a Test Case. PLoS ONE. 8(9). e75078–e75078. 73 indexed citations
20.

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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