Ken Okaji

1.3k total citations
18 papers, 948 citations indexed

About

Ken Okaji is a scholar working on Ecology, Oceanography and Global and Planetary Change. According to data from OpenAlex, Ken Okaji has authored 18 papers receiving a total of 948 indexed citations (citations by other indexed papers that have themselves been cited), including 15 papers in Ecology, 12 papers in Oceanography and 11 papers in Global and Planetary Change. Recurrent topics in Ken Okaji's work include Coral and Marine Ecosystems Studies (15 papers), Marine and coastal plant biology (10 papers) and Marine and fisheries research (8 papers). Ken Okaji is often cited by papers focused on Coral and Marine Ecosystems Studies (15 papers), Marine and coastal plant biology (10 papers) and Marine and fisheries research (8 papers). Ken Okaji collaborates with scholars based in Japan, Australia and United States. Ken Okaji's co-authors include Glenn De’ath, Katharina Fabricius, Jon Brodie, Tenshi Ayukai, John S. Lucas, Nina Yasuda, Kazuo Nadaoka, Karin Gérard, Masami Hamaguchi and Satoshi Nagai and has published in prestigious journals such as Molecular Ecology, Marine Pollution Bulletin and Marine Ecology Progress Series.

In The Last Decade

Ken Okaji

17 papers receiving 882 citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Ken Okaji Japan	12	832	562	530	91	83	18	948
Luis E. Calderón‐Aguilera Mexico	20	722 0.9×	584 1.0×	493 0.9×	134 1.5×	109 1.3×	87	998
Mary Stafford-Smith Australia	4	852 1.0×	496 0.9×	468 0.9×	126 1.4×	39 0.5×	5	1.0k
Carmen Barberá Spain	16	622 0.7×	470 0.8×	570 1.1×	105 1.2×	113 1.4×	31	997
Martha S. Nizinski United States	13	598 0.7×	348 0.6×	403 0.8×	124 1.4×	83 1.0×	29	786
Amilcar Leví Cupul‐Magaña Mexico	21	1.2k 1.4×	645 1.1×	820 1.5×	72 0.8×	77 0.9×	90	1.3k
Thierry Lison de Loma France	12	755 0.9×	508 0.9×	391 0.7×	79 0.9×	51 0.6×	17	813
J. G. Harmelin France	13	783 0.9×	764 1.4×	429 0.8×	171 1.9×	101 1.2×	17	1.1k
Mohsen Kayal France	13	772 0.9×	540 1.0×	527 1.0×	70 0.8×	39 0.5×	29	908
Stephen C. Schroeter United States	16	881 1.1×	383 0.7×	884 1.7×	158 1.7×	109 1.3×	37	1.3k
Charles F. Boudouresque France	6	538 0.6×	466 0.8×	501 0.9×	42 0.5×	59 0.7×	10	871

Countries citing papers authored by Ken Okaji

Since Specialization

Citations

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

Fields of papers citing papers by Ken Okaji

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Ken Okaji

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

All Works

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18 of 18 papers shown

Okaji, Ken, Kei Ogasawara, Makoto Kitamura, et al.. (2019). Comprehensive management program of crown-of-thorns starfish outbreaks in Okinawa. 21(1). 91–110. 6 indexed citations

Mellin, Camille, et al.. (2017). Selective Feeding and Microalgal Consumption Rates by Crown-Of-Thorns Seastar (Acanthaster cf. solaris) Larvae. Diversity. 9(1). 8–8. 15 indexed citations

Nakamura, Masako, et al.. (2016). Using Long-Term Removal Data to Manage a Crown-of-Thorns Starfish Population. Diversity. 8(4). 24–24. 12 indexed citations

Nakajima, Ryota, et al.. (2016). Crown-of-Thorns Starfish Larvae Can Feed on Organic Matter Released from Corals. Diversity. 8(4). 18–18. 17 indexed citations

Nakamura, Morikazu, Naoki H. Kumagai, Kazuhiko Sakai, et al.. (2015). Spatial variability in recruitment of acroporid corals and predatory starfish along the Onna coast, Okinawa, Japan. Marine Ecology Progress Series. 540. 1–12. 16 indexed citations

Nakamura, Masako, et al.. (2014). Spatial and temporal population dynamics of the crown-of-thorns starfish, Acanthaster planci, over a 24-year period along the central west coast of Okinawa Island, Japan. Marine Biology. 161(11). 2521–2530. 37 indexed citations

Kayanne, Hajime, Chuki Hongo, Ken Okaji, et al.. (2012). Low species diversity of hermatypic corals on an isolated reef, Okinotorishima, in the northwestern Pacific. Galaxea Journal of Coral Reef Studies. 14(1). 73–95. 5 indexed citations

Okubo, Nami, et al.. (2010). Reproduction in Cultured versus Wild Coral Colonies: Fertilization, Larval Oxygen Consumption, and Survival. Biological Bulletin. 218(3). 230–236. 11 indexed citations

Yasuda, Nina, et al.. (2010). Latitudinal differentiation in the reproduction patterns of the crown-of-thorns starfish Acanthaster planci through the Ryukyu Island Archipelago. Plankton and Benthos Research. 5(4). 156–164. 20 indexed citations

10.

Fabricius, Katharina, Ken Okaji, & Glenn De’ath. (2010). Three lines of evidence to link outbreaks of the crown-of-thorns seastar Acanthaster planci to the release of larval food limitation. Coral Reefs. 29(3). 593–605. 260 indexed citations

11.

Yasuda, Nina, Satoshi Nagai, Masami Hamaguchi, et al.. (2009). Gene flow of Acanthaster planci (L.) in relation to ocean currents revealed by microsatellite analysis. Molecular Ecology. 18(8). 1574–1590. 92 indexed citations

12.

Okubo, Nami, et al.. (2008). Oxygen consumption of a single embryo/planula in the reef-building coral Acropora intermedia. Marine Ecology Progress Series. 366. 305–309. 31 indexed citations

13.

Golbuu, Yimnang, et al.. (2007). Palau’s coral reefs show differential habitat recovery following the 1998-bleaching event. Coral Reefs. 26(2). 319–332. 124 indexed citations

14.

Brodie, Jon, Katharina Fabricius, Glenn De’ath, & Ken Okaji. (2004). Are increased nutrient inputs responsible for more outbreaks of crown-of-thorns starfish? An appraisal of the evidence. Marine Pollution Bulletin. 51(1-4). 266–278. 230 indexed citations

15.

De’ath, Glenn, et al.. (2004). Increased chlorophyll levels lead to increased frequency and severity of outbreaks of the crown-of-thorns starfish (Acanthaster planci) on the Great Barrier Reef. 1 indexed citations

16.

Okaji, Ken, Tenshi Ayukai, & John Lucas. (1997). Selective uptake of dissolved free amino acids by the larvae of the crown-of-thorns starfish, Acanthaster planci (L.). 1 indexed citations

17.

Okaji, Ken, Tenshi Ayukai, & John S. Lucas. (1997). Selective feeding by larvae of the crown-of-thorns starfish, Acanthaster planci (L.). Coral Reefs. 16(1). 47–50. 64 indexed citations

18.

Keesing, John K., et al.. (1996). Mortality rates of juvenile starfish Acanthaster planci and Nardoa spp measured on the Great Barrier Reef, Australia and in Okinawa, Japan. Institutional Archive of Ifremer (French Research Institute for Exploitation of the Sea). 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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