Variation and process of life history evolution in insular dwarfism as revealed by a natural experiment

Hayashi, Shoji; Kubo, Mugino O.; Sánchez-Villagra, Marcelo R. et al.

Frontiers in Earth Science, 2023, 11, 1095903

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Identifier to cite or link to this item: https://hdl.handle.net/11094/93117

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Title
Variation and process of life history evolution in insular dwarfism as revealed by a natural experiment
Creator
NRID
1000060708139 1000060708139
CreatorName
Hayashi, Shoji
CreatorName
Kubo, Mugino O.
CreatorName
Sánchez-Villagra, Marcelo R.
NRID
1000040110043 1000040110043
CreatorName
Taruno, Hiroyuki
NRID
1000010192478 1000010192478
CreatorName
Izawa, Masako
CreatorName
Shiroma, Tsunehiro
NRID
1000030243182 1000030243182
ORCID
0000-0001-8052-1698 0000-0001-8052-1698
researchmap permalink
read0013987 read0013987
Scopus Author ID
7403896013 7403896013
CreatorName
Nakano, Takayoshi
NRID
1000050804126 1000050804126
CreatorName
Fujita, Masaki
Subject
bone histology
deer
demography
fossils
growth rate
islands
life history
skeletochronology
Description
Hayashi S., Kubo M.O., Sánchez-Villagra M.R., et al. Variation and process of life history evolution in insular dwarfism as revealed by a natural experiment. Frontiers in Earth Science 11, 1095903 (2023); https://doi.org/10.3389/feart.2023.1095903.
Abstract
Islands are a classic focus for evolutionary studies. One topic of great interest has been the evolution of “dwarfs,” significantly smaller island mammals relative to their continental counterparts. Although a consensus has been achieved regarding the multivariate ecological causes behind changes in body size, the processes involved remain largely unexplored. Life history variables, including age at first reproduction, growth rate, and longevity, are likely to be key to understanding the process of insular dwarfism. The Japanese archipelago, with its numerous islands, offers a unique natural experiment for the evolution of different sizes within the same group of organisms; namely, deer. Thus, we investigated eight deer populations with a total number of 52 individuals exhibiting body size variation, both extant and fossil, to clarify the effect of insularity on life history traits. We applied several methods to both extant and extinct populations to resolve life history changes among these deer populations. Skeletochronology, using lines of arrested growth formed in long bones (femur and tibia), successfully reconstructed body growth curves and revealed a gradual change in growth trajectories reflecting the degree of insularity. Slower growth rates with prolonged growth periods in more isolated deer populations were revealed. An extensive examination of bone microstructure further corroborated this finding, with much slower growth and later somatic maturity evident in fossil insular deer isolated for more than 1.5 Myr. Finally, mortality patterns assessed by demographic analysis revealed variation among deer populations, with a life history of insular populations shifting toward the “slow life.”
Publisher
Frontiers Media S.A.
Source Title
Frontiers in Earth Science
Volume (Issue)
11
Page
1095903
Date of Issued
2023-05-22
Language
English
Handle URL
https://hdl.handle.net/11094/93117
eISSN
22966463
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.3389/feart.2023.1095903
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution 4.0 International License.
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article