Island gigantism is a documented evolutionary phenomenon in plants and animals
Island gigantism is a well-documented evolutionary and ecological phenomenon where small mainland species evolve significantly larger body sizes when isolated on islands.
The retrieved literature robustly supports the claim that island gigantism is a documented phenomenon in plants and animals. Multiple studies across diverse taxa (mammals, reptiles, birds, and plants) confirm the island rule, demonstrating that small species frequently evolve gigantism under insular conditions.
Mark V. Lomolino. Body size evolution in insular vertebrates: generality of the island rule. 2005. https://doi.org/10.1111/j.1365-2699.2005.01314.x
Supports the island rule, confirming the general trend of gigantism in smaller species across insular vertebrates.
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Alexander Zizka, R. Onstein, R. Rozzi, Patrick Weigelt, H. Kreft, M. Steinbauer, H. Bruelheide, F. Lens. The evolution of insular woodiness. 2022. https://doi.org/10.1073/pnas.2208629119
Documents insular woodiness and gigantism as notable evolutionary traits in island plant species.
R. Rozzi, Mark V. Lomolino, Alexandra A. E. van der Geer, D. Silvestro, S. K. Lyons, P. Bover, J. Alcover, Ana Benítez‐López, Cheng‐Hsiu Tsai, Masaki Fujita, M. Kubo, J. Ochoa, Matthew E. Scarborough, S. Turvey, Alexander Zizka, Jonathan M. Chase. Dwarfism and gigantism drive human-mediated extinctions on islands. 2023. https://doi.org/10.1126/science.add8606
Examines morphologically divergent giant and dwarf species resulting from island evolution.
P. Renom, Toni de-Dios, S. Civit, Laia Llovera, A. Sánchez‐Gracia, Esther Lizano, J. Rando, Tomàs Marquès-Bonet, G. Kergoat, I. Casanovas‐Vilar, C. Lalueza-Fox. Genetic data from the extinct giant rat from Tenerife (Canary Islands) points to a recent divergence from mainland relatives. 2021. https://doi.org/10.1098/rsbl.2021.0533
Shows that Tenerife giant rats evolved rapidly from mainland relatives via island gigantism.
Rachel Berg, Pirmin Nietlisbach. Giant mice on small islands: biogeographic and ecological differences contribute to gigantism in island populations.. 2025. https://doi.org/10.1098/rspb.2025.1201
Provides evidence of insular gigantism in island mice compared to mainland populations.
Zengke Zhang, Wensheng Chen, Zengyan Li, Wentao Ren, Ling Mou, Junyong Zheng, Tian Zhang, Hantang Qin, Liyi Zhou, Bile Sai, Hang Ci, Yongchuan Yang, Shekhar R Biswas, Enrong Yan. The island rule-like patterns of plant size variation in a young land-bridge archipelago: Roles of environmental circumstance and biotic competition.. 2025. https://doi.org/10.1016/j.pld.2024.12.001
Finds island rule-like plant size variations, including gigantism, across an archipelago.
Kenneth Petren, Ted J Case. A PHYLOGENETIC ANALYSIS OF BODY SIZE EVOLUTION AND BIOGEOGRAPHY IN CHUCKWALLAS (SAUROMALUS) AND OTHER IGUANINES.. 1997. https://doi.org/10.1111/j.1558-5646.1997.tb02402.x
Demonstrates that isolated island chuckwallas evolved significantly larger body sizes than mainland species.
J Scott Keogh, Ian A W Scott, Christine Hayes. Rapid and repeated origin of insular gigantism and dwarfism in Australian tiger snakes.. 2005. https://pubmed.ncbi.nlm.nih.gov/15792242/
Documents rapid and repeated evolution of island gigantism in Australian tiger snakes.
Ana Benítez-López, Luca Santini, Juan Gallego-Zamorano, Borja Milá, Patrick Walkden, Mark A J Huijbregts, Joseph A Tobias. The island rule explains consistent patterns of body size evolution in terrestrial vertebrates.. 2021. https://doi.org/10.1038/s41559-021-01426-y
Confirms through a phylogenetic meta-analysis that island rule body size shifts are widespread in terrestrial vertebrates.
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