Isao Koike

7.5k total citations · 2 hit papers
110 papers, 5.9k citations indexed

About

Isao Koike is a scholar working on Oceanography, Ecology and Global and Planetary Change. According to data from OpenAlex, Isao Koike has authored 110 papers receiving a total of 5.9k indexed citations (citations by other indexed papers that have themselves been cited), including 85 papers in Oceanography, 76 papers in Ecology and 22 papers in Global and Planetary Change. Recurrent topics in Isao Koike's work include Marine and coastal ecosystems (66 papers), Marine Biology and Ecology Research (36 papers) and Microbial Community Ecology and Physiology (29 papers). Isao Koike is often cited by papers focused on Marine and coastal ecosystems (66 papers), Marine Biology and Ecology Research (36 papers) and Microbial Community Ecology and Physiology (29 papers). Isao Koike collaborates with scholars based in Japan, United States and United Kingdom. Isao Koike's co-authors include Hiroshi Ogawa, Toshi Nagata, Akihiko Hattori, Toshihiro Miyajima, Akinori Hattori, Kazuki Terauchi, Shigemitsu Hara, Ronald Benner, Karl Kaiser and Kazuhiro Kogure and has published in prestigious journals such as Nature, Science and Journal of Geophysical Research Atmospheres.

In The Last Decade

Isao Koike

107 papers receiving 5.5k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Production of Refractory Dissolved Organic Matter by Bacteria

2001 547 citations Hiroshi Ogawa, Isao Koike et al. profile →
Direct Determination of Carbon and Nitrogen Contents of Natural Bacterial Assemblages in Marine Environments

1998 539 citations Hiroshi Ogawa, Toshi Nagata et al. Applied and Environmental Microbiology profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Isao Koike Japan	42	3.8k	3.8k	1.1k	1.0k	702	110	5.9k
T. H. Blackburn Denmark	37	2.9k 0.8×	2.3k 0.6×	1.1k 1.0×	1.7k 1.7×	828 1.2×	79	5.7k
Graham J. C. Underwood United Kingdom	50	3.6k 0.9×	2.9k 0.8×	668 0.6×	1.8k 1.7×	676 1.0×	101	6.2k
Toshi Nagata Japan	36	3.0k 0.8×	3.3k 0.9×	624 0.6×	1.2k 1.2×	359 0.5×	117	4.8k
James L. Pinckney United States	46	3.9k 1.0×	3.0k 0.8×	1.0k 0.9×	2.0k 1.9×	543 0.8×	118	6.7k
Yoshiaki Maita Japan	16	4.2k 1.1×	2.6k 0.7×	1.4k 1.3×	1.2k 1.2×	349 0.5×	48	6.0k
Margaret R. Mulholland United States	44	4.5k 1.2×	3.2k 0.8×	849 0.8×	1.2k 1.2×	529 0.8×	124	5.8k
Nick Owens United Kingdom	37	2.9k 0.8×	1.7k 0.5×	1.0k 0.9×	1.1k 1.1×	348 0.5×	68	4.1k
Todd M. Kana United States	34	4.2k 1.1×	2.6k 0.7×	750 0.7×	2.6k 2.5×	787 1.1×	45	6.6k
Joel C. Goldman United States	41	4.2k 1.1×	2.0k 0.5×	1.0k 0.9×	1.8k 1.8×	496 0.7×	76	6.3k
Helle Ploug Germany	44	3.9k 1.0×	3.5k 0.9×	454 0.4×	1.4k 1.4×	743 1.1×	80	5.9k

Countries citing papers authored by Isao Koike

Since Specialization

Citations

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

Fields of papers citing papers by Isao Koike

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Isao Koike

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

All Works

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20 of 20 papers shown

Inoue, Shogo, et al.. (2023). Development of the Autonomous Core Sampling System for AUV. ePrints Soton (University of Southampton). 1–4.

Umezawa, Yu, Teruhisa Komatsu, Masumi Yamamuro, & Isao Koike. (2009). Physical and topographic factors affecting suspended particulate matter composition in a shallow tropical estuary. Marine Environmental Research. 68(2). 59–70. 6 indexed citations

Tanaka, Yasuaki, Toshihiro Miyajima, Isao Koike, Takeshi Hayashibara, & Hiroshi Ogawa. (2008). Production of Dissolved and Particulate Organic Matter by the Reef-building Corals Porites cylindrica and Acropora pulchra. Bulletin of Marine Science. 82(2). 237–245. 38 indexed citations

Umezawa, Yu, Toshihiro Miyajima, & Isao Koike. (2008). Stable nitrogen isotope composition in sedimentary organic matter as a potential proxy of nitrogen sources for primary producers at a fringing coral reef. Journal of Oceanography. 64(6). 899–909. 8 indexed citations

Fukuda, Hideki, et al.. (2007). Sources of dissolved organic carbon and nitrogen in Otsuchi Bay on the Sanriku ria coast of Japan in the spring. 31(1). 19–29. 10 indexed citations

Umezawa, Yu, Toshihiro Miyajima, Yasuaki Tanaka, Isao Koike, & Takeshi Hayashibara. (2007). VARIATION IN INTERNAL δ¹⁵N AND δ¹³C DISTRIBUTIONS AND THEIR BULK VALUES IN THE BROWN MACROALGA PADINA AUSTRALIS GROWING IN SUBTROPICAL OLIGOTROPHIC WATERS¹. Journal of Phycology. 43(3). 437–448. 16 indexed citations

Koike, Isao. (2004). Structural significances of pseudouridination and methylation of uridine residues in tRNA: X-Ray analyses of DNA dodecamers containing uridine and pseudouridine. Nucleic Acids Symposium Series. 48(1). 253–254.

Austen, Melanie C., P.J.D. Lambshead, Pat Hutchings, et al.. (2002). Biodiversity links above and below the marine sediment–water interface that may influence community stability. Biodiversity and Conservation. 11(1). 113–136. 50 indexed citations

Hasegawa, Taro, Isao Koike, & H. Mukai. (2000). Estimation of dissolved organic nitrogen release by micrograzers in natural planktonic assemblages. 9 indexed citations

10.

Sohrin, Yoshiki, et al.. (2000). East—west gradient in ectoenzyme activities in the subarctic Pacific: Possible regulation by zinc. Limnology and Oceanography. 45(4). 930–939. 45 indexed citations

11.

Austen, Melanie C., Guy Boucher, C.H.R. Heip, et al.. (2000). Global Change and Biodiversity of Marine Sediments: Impacts and Linkages Across the Sediment–Water Interface. 50(12). 7 indexed citations

12.

Yamamuro, Masumi, Isao Koike, & Hitoshi Iizumi. (1993). Partitioning of the nitrogen stock in the vicinity of a Fijian seagrass bed dominated by Syringodium isoetifolium (Ascherson) Dandy. Australian Journal of Marine and Freshwater Research. 44(1). 101–115. 9 indexed citations

13.

Hara, Shigemitsu, Kazuki Terauchi, & Isao Koike. (1991). Abundance of Viruses in Marine Waters: Assessment by Epifluorescence and Transmission Electron Microscopy. Applied and Environmental Microbiology. 57(9). 2731–2734. 143 indexed citations

14.

Koike, Isao, et al.. (1990). Estimation of ammonification and ammonium assimilation in surficial coastal and estuarine sediments. Limnology and Oceanography. 35(2). 270–286. 22 indexed citations

15.

Mukai, H., Isao Koike, Moritaka Nishihira, & Satoshi Nojima. (1989). Oxygen consumption and ammonium excretion of mega-sized benthic invertebrates in a tropical seagrass bed. Journal of Experimental Marine Biology and Ecology. 134(2). 101–115. 28 indexed citations

16.

Koike, Isao, et al.. (1986). Inorganic nitrogen metabolism by Antarctic phytoplankton with special reference to ammonium cycling. Marine Ecology Progress Series. 30. 105–116. 134 indexed citations

17.

Koike, Isao & H. Mukai. (1983). Oxygen and inorganic nitrogen contents and fluxes in burrows of the shrimps Callianassa japonica and Upogebia major. Marine Ecology Progress Series. 12. 185–190. 96 indexed citations

18.

Koike, Isao, et al.. (1981). Microbial nitrogen metabolism in the scotia sea south atlantic ocean. 16(5). 165–166. 2 indexed citations

19.

Koike, Isao & Akinori Hattori. (1975). Growth Yield of a Denitrifying Bacterium, Pseudomonas denitrificans, under Aerobic and Denitrifying Conditions. Journal of General Microbiology. 88(1). 1–10. 91 indexed citations

20.

Seki, H., Isao Koike, E. Matsumoto, & A Hattori. (1972). A study on the distribution of total bacteria, bacterial aggregates and heterotrophic bacteria in the sea. Journal of Oceanography. 28(3). 103–108. 1 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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