2026 Daniel H. Janzen: Ecology and Evolution Researcher – H-Index, Publications & Awards

Discipline name	D-Index	World Ranking	Current World Ranking	National Ranking	Current National Ranking	Publications	Citations
Ecology and Evolution	119	108	101	42	40	666	73271

Research.com Recognitions

2026 - Research.com Ecology and Evolution in United States Leader Award
2025 - Research.com Ecology and Evolution in United States Leader Award
1992 - Member of the National Academy of Sciences
1990 - Fellow of the American Academy of Arts and Sciences
1989 - Fellow of the MacArthur Foundation

Overview

Daniel H. Janzen is affiliated with the University of Pennsylvania in the United States and has contributed extensively in the fields of Agricultural and Biological Sciences as well as Environmental Science. Their research focuses primarily on insect science, ecology, evolution, behavior, systematics, genetics, and nature and landscape conservation.

Their work covers major topics including forest insect ecology and management, insect-plant interactions and control, insect behavior and control techniques, lepidoptera biology and taxonomy, hymenoptera taxonomy and phylogeny, plant and animal studies, and ecology and vegetation dynamics studies.

Recent significant publications include:

"A global phylogeny of butterflies reveals their evolutionary history, ancestral hosts and biogeographic origins" (2023, Nature Ecology & Evolution)
"Minimalist revision and description of 403 new species in 11 subfamilies of Costa Rican braconid parasitoid wasps, including host records for 219 species" (2021, ZooKeys)
"To us insectometers, it is clear that insect decline in our Costa Rican tropics is real, so let's be kind to the survivors" (2021, Proceedings of the National Academy of Sciences)
"Área de Conservación Guanacaste, northwestern Costa Rica: Converting a tropical national park to conservation via biodevelopment" (2020, Biotropica)
"Using DNA-barcoded Malaise trap samples to measure impact of a geothermal energy project on the biodiversity of a Costa Rican old-growth rain forest" (2020, Genome)

Frequent co-authors in their collaborations include:

Winnie Hallwachs
Paul D. N. Hebert
Michael J. Sharkey
Sujeevan Ratnasingham
Brianne St. Jacques

The scientist has published extensively in venues such as:

Zenodo (CERN European Organization for Nuclear Research)
Zootaxa
Biodiversity Data Journal
ZooKeys
Proceedings of the Entomological Society of Washington

Their work is recognized in part by memberships and fellowships, including:

Member of the National Academy of Sciences (1992)
Fellow of the American Academy of Arts and Sciences (1990)
Fellow of the MacArthur Foundation (1989)

Best Publications

Herbivores and the Number of Tree Species in Tropical Forests

Daniel H. Janzen

6324
Citations
Ten species in one: DNA barcoding reveals cryptic species in the neotropical skipper butterfly Astraptes fulgerator

Paul D. N. Hebert;Erin H. Penton;John M. Burns;Daniel H. Janzen

4502
Citations
Herbivores: Their Interaction With Secondary Plant Metabolites

Gerald A. Rosenthal;Daniel H. Janzen

3069
Citations
Seed Predation by Animals

Daniel H. Janzen

2775
Citations
Use of DNA barcodes to identify flowering plants

W. John Kress;Kenneth J. Wurdack;Elizabeth A. Zimmer;Lee A. Weigt

2654
Citations
Why Mountain Passes are Higher in the Tropics

Daniel H. Janzen

2360
Citations
DNA barcodes distinguish species of tropical Lepidoptera

Mehrdad Hajibabaei;Daniel H. Janzen;John M. Burns;Winnie Hallwachs

1900
Citations
Strategies in Herbivory by Mammals: The Role of Plant Secondary Compounds

W. J. Freeland;Daniel H. Janzen

1793
Citations
Averting biodiversity collapse in tropical forest protected areas

William F. Laurance;William F. Laurance;D. Carolina Useche;Julio Rendeiro;Margareta Kalka

1396
Citations
COEVOLUTION OF MUTUALISM BETWEEN ANTS AND ACACIAS IN CENTRAL AMERICA

Daniel H. Janzen

1270
Citations
Why Bamboos Wait So Long to Flower

Daniel H. Janzen

1261
Citations
When Is It Coevolution

Daniel H. Janzen

1246
Citations
Herbivores. Their Interaction with Secondary Plant Metabolites.

Rodolfo Dirzo;G. A. Rosenthal;D. H. Janzen

1203
Citations
Tropical blackwater rivers, animals, and mast fruiting by the Dipterocarpaceae

Daniel H. Janzen

1148
Citations
Neotropical anachronisms: the fruits the gomphotheres ate.

Daniel H. Janzen;Paul S. Martin

1118
Citations
How to be a Fig

Daniel H. Janzen

1086
Citations
Costa Rican Natural History

Daniel H. Janzen

1056
Citations
Euglossine Bees as Long-Distance Pollinators of Tropical Plants

D. H. Janzen

1017
Citations
SEED-EATERS VERSUS SEED SIZE, NUMBER, TOXICITY AND DISPERSAL

Daniel H. Janzen

916
Citations
Sweep Samples of Tropical Foliage Insects: Effects of Seasons, Vegetation Types, Elevation, Time of Day, and Insularity

Daniel H. Janzen

898
Citations
SYNCHRONIZATION OF SEXUAL REPRODUCTION OF TREES WITHIN THE DRY SEASON IN CENTRAL AMERICA.

Daniel H. Janzen

786
Citations
STRATEGIES IN HERBIVORY BY MAMMALS: THE ROLE OF

W. J. Freeland;Daniel H. Janzen

0
Citations

Frequent Co-Authors

Winnie Hallwachs University of Pennsylvania

M. Alex Smith University of Guelph

Mehrdad Hajibabaei University of Guelph

Paul D. N. Hebert University of Guelph

James B. Whitfield University of Illinois at Urbana-Champaign

Nick V. Grishin The University of Texas Southwestern Medical Center

Donald L. J. Quicke Chulalongkorn University

Scott E. Miller National Museum of Natural History

W. John Kress Smithsonian Institution

Rodolfo Dirzo Stanford University

External Links

Wikipedia of Daniel H. Janzen Personal website of Daniel H. Janzen

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