Abstract
Ancient lakes have been recognized as "long-term isolated islands" in terrestrial ecosystems. Lake Biwa, one of the few ancient lakes that formed around 4 million years ago, harbors many coastal species that commonly inhabit seashores. The beach pea, Lathyrus japonicus, is a typical coastal species of this freshwater lake, where morphological, physiological, and genetic differentiations have been reported between Biwa and coastal populations. Whether Biwa populations were isolated for long periods throughout Pleistocene climatic oscillations and subsequent range shifts is unclear. We assessed population genetic structure and demography of beach pea in this ancient freshwater lake using the sequences of eight nuclear loci. The results of STRUCTURE analyses showed evidence of admixture between Biwa and coastal populations, reflecting recent gene flow. The estimated demographic parameters implemented by the isolation with migration model (IM model) revealed a recent divergence (postglacial period) of Biwa populations, with some gene flow from Biwa to coastal populations. In addition, Biwa populations were significantly smaller in size than the ancestral or coastal populations. Our study suggests that a Holocene thermal maximum, when transgression could allow seeds from coastal plants to access Lake Biwa, was involved in the origin of the Biwa populations and their genetic divergence. Thus, coastal populations might have migrated to Lake Biwa relatively recently. Our study concluded that ancestral migrants in Lake Biwa were derived from small founding populations and accelerated genetic isolation of Biwa populations during short-term isolation.
| Original language | English |
|---|---|
| Pages (from-to) | 2600-2611 |
| Number of pages | 12 |
| Journal | Ecology and Evolution |
| Volume | 3 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2013 |
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Keywords
- Ancient lake
- Coastal plants
- Isolation with migration model
- Lake biwa
- Lathyrus japonicus
- Postglacial period
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
- Ecology
- Nature and Landscape Conservation
Cite this
Recent colonization by a coastal plant of inland habitats at an ancient freshwater lake, Lake Biwa : Multilocus sequencing and a demographic history of lathyrus japonicus (fabaceae). / Ohtsuki, Tatsuo; Ikeda, Hajime; Setoguchi, Hiroaki.
In: Ecology and Evolution, Vol. 3, No. 8, 2013, p. 2600-2611.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Recent colonization by a coastal plant of inland habitats at an ancient freshwater lake, Lake Biwa
T2 - Multilocus sequencing and a demographic history of lathyrus japonicus (fabaceae)
AU - Ohtsuki, Tatsuo
AU - Ikeda, Hajime
AU - Setoguchi, Hiroaki
PY - 2013
Y1 - 2013
N2 - Ancient lakes have been recognized as "long-term isolated islands" in terrestrial ecosystems. Lake Biwa, one of the few ancient lakes that formed around 4 million years ago, harbors many coastal species that commonly inhabit seashores. The beach pea, Lathyrus japonicus, is a typical coastal species of this freshwater lake, where morphological, physiological, and genetic differentiations have been reported between Biwa and coastal populations. Whether Biwa populations were isolated for long periods throughout Pleistocene climatic oscillations and subsequent range shifts is unclear. We assessed population genetic structure and demography of beach pea in this ancient freshwater lake using the sequences of eight nuclear loci. The results of STRUCTURE analyses showed evidence of admixture between Biwa and coastal populations, reflecting recent gene flow. The estimated demographic parameters implemented by the isolation with migration model (IM model) revealed a recent divergence (postglacial period) of Biwa populations, with some gene flow from Biwa to coastal populations. In addition, Biwa populations were significantly smaller in size than the ancestral or coastal populations. Our study suggests that a Holocene thermal maximum, when transgression could allow seeds from coastal plants to access Lake Biwa, was involved in the origin of the Biwa populations and their genetic divergence. Thus, coastal populations might have migrated to Lake Biwa relatively recently. Our study concluded that ancestral migrants in Lake Biwa were derived from small founding populations and accelerated genetic isolation of Biwa populations during short-term isolation.
AB - Ancient lakes have been recognized as "long-term isolated islands" in terrestrial ecosystems. Lake Biwa, one of the few ancient lakes that formed around 4 million years ago, harbors many coastal species that commonly inhabit seashores. The beach pea, Lathyrus japonicus, is a typical coastal species of this freshwater lake, where morphological, physiological, and genetic differentiations have been reported between Biwa and coastal populations. Whether Biwa populations were isolated for long periods throughout Pleistocene climatic oscillations and subsequent range shifts is unclear. We assessed population genetic structure and demography of beach pea in this ancient freshwater lake using the sequences of eight nuclear loci. The results of STRUCTURE analyses showed evidence of admixture between Biwa and coastal populations, reflecting recent gene flow. The estimated demographic parameters implemented by the isolation with migration model (IM model) revealed a recent divergence (postglacial period) of Biwa populations, with some gene flow from Biwa to coastal populations. In addition, Biwa populations were significantly smaller in size than the ancestral or coastal populations. Our study suggests that a Holocene thermal maximum, when transgression could allow seeds from coastal plants to access Lake Biwa, was involved in the origin of the Biwa populations and their genetic divergence. Thus, coastal populations might have migrated to Lake Biwa relatively recently. Our study concluded that ancestral migrants in Lake Biwa were derived from small founding populations and accelerated genetic isolation of Biwa populations during short-term isolation.
KW - Ancient lake
KW - Coastal plants
KW - Isolation with migration model
KW - Lake biwa
KW - Lathyrus japonicus
KW - Postglacial period
UR - http://www.scopus.com/inward/record.url?scp=84887916632&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84887916632&partnerID=8YFLogxK
U2 - 10.1002/ece3.654
DO - 10.1002/ece3.654
M3 - Article
AN - SCOPUS:84887916632
VL - 3
SP - 2600
EP - 2611
JO - Ecology and Evolution
JF - Ecology and Evolution
SN - 2045-7758
IS - 8
ER -