Chloroplast population genetics reveals low levels of genetic variation and conformation to the central–marginal hypothesis in Taxus wallichiana var. mairei, an endangered conifer endemic to China
Abstract The central–marginal hypothesis predicts that geographically peripheral populations should exhibit reduced genetic diversity and increased genetic differentiation than central populations due to smaller effective population size and stronger geographical isolation. We evaluated these predic...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2019-10-01
|
| Series: | Ecology and Evolution |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/ece3.5703 |
| _version_ | 1818432908687310848 |
|---|---|
| author | Li Liu Zhen Wang Lijie Huang Ting Wang Yingjuan Su |
| author_facet | Li Liu Zhen Wang Lijie Huang Ting Wang Yingjuan Su |
| author_sort | Li Liu |
| collection | DOAJ |
| description | Abstract The central–marginal hypothesis predicts that geographically peripheral populations should exhibit reduced genetic diversity and increased genetic differentiation than central populations due to smaller effective population size and stronger geographical isolation. We evaluated these predictions in the endangered conifer Taxus wallichiana var. mairei. Eight plastid simple sequence repeats (cpSSRs) were used to investigate plastid genetic variation in 22 populations of Taxus wallichiana var. mairei, encompassing nearly its entire distribution range. Low levels of plastid genetic variation and differentiation were detected in the populations, and the findings were attributed to low mutation rates, small population sizes, habitat fragmentation and isolation, and effective pollen or seed dispersal. Hunan and Hubei were identified as major refugia based on the number of private haplotypes and species distribution modeling. Trends in plastid genetic diversity and genetic differentiation from central to peripheral populations supported the predictions of the central–marginal hypothesis. In scenarios wherein the future climate becomes warmer, we predict that some peripheral populations will disappear and southern and southeastern regions will become significantly less habitable. Factors that include the levels of precipitation during the driest month, annual precipitation level, and annual temperature range will be decisive in shaping the future distribution of these populations. This study provides a theoretical basis for the conservation of T. wallichiana var. mairei. |
| first_indexed | 2024-12-14T16:12:41Z |
| format | Article |
| id | doaj.art-2e5c187af0a842179cd29e57f7948d80 |
| institution | Directory Open Access Journal |
| issn | 2045-7758 |
| language | English |
| last_indexed | 2024-12-14T16:12:41Z |
| publishDate | 2019-10-01 |
| publisher | Wiley |
| record_format | Article |
| series | Ecology and Evolution |
| spelling | doaj.art-2e5c187af0a842179cd29e57f7948d802022-12-21T22:54:57ZengWileyEcology and Evolution2045-77582019-10-01920119441195610.1002/ece3.5703Chloroplast population genetics reveals low levels of genetic variation and conformation to the central–marginal hypothesis in Taxus wallichiana var. mairei, an endangered conifer endemic to ChinaLi Liu0Zhen Wang1Lijie Huang2Ting Wang3Yingjuan Su4School of Life Sciences Sun Yat‐sen University Guangzhou ChinaCollege of Life Sciences Nanjing Agricultural University Nanjing ChinaSchool of Life Sciences Sun Yat‐sen University Guangzhou ChinaCollege of Life Sciences South China Agricultural University Guangzhou ChinaSchool of Life Sciences Sun Yat‐sen University Guangzhou ChinaAbstract The central–marginal hypothesis predicts that geographically peripheral populations should exhibit reduced genetic diversity and increased genetic differentiation than central populations due to smaller effective population size and stronger geographical isolation. We evaluated these predictions in the endangered conifer Taxus wallichiana var. mairei. Eight plastid simple sequence repeats (cpSSRs) were used to investigate plastid genetic variation in 22 populations of Taxus wallichiana var. mairei, encompassing nearly its entire distribution range. Low levels of plastid genetic variation and differentiation were detected in the populations, and the findings were attributed to low mutation rates, small population sizes, habitat fragmentation and isolation, and effective pollen or seed dispersal. Hunan and Hubei were identified as major refugia based on the number of private haplotypes and species distribution modeling. Trends in plastid genetic diversity and genetic differentiation from central to peripheral populations supported the predictions of the central–marginal hypothesis. In scenarios wherein the future climate becomes warmer, we predict that some peripheral populations will disappear and southern and southeastern regions will become significantly less habitable. Factors that include the levels of precipitation during the driest month, annual precipitation level, and annual temperature range will be decisive in shaping the future distribution of these populations. This study provides a theoretical basis for the conservation of T. wallichiana var. mairei.https://doi.org/10.1002/ece3.5703central–marginal hypothesisclimatic variablecpSSRsplastid genetic variationTaxus wallichiana var. mairei |
| spellingShingle | Li Liu Zhen Wang Lijie Huang Ting Wang Yingjuan Su Chloroplast population genetics reveals low levels of genetic variation and conformation to the central–marginal hypothesis in Taxus wallichiana var. mairei, an endangered conifer endemic to China Ecology and Evolution central–marginal hypothesis climatic variable cpSSRs plastid genetic variation Taxus wallichiana var. mairei |
| title | Chloroplast population genetics reveals low levels of genetic variation and conformation to the central–marginal hypothesis in Taxus wallichiana var. mairei, an endangered conifer endemic to China |
| title_full | Chloroplast population genetics reveals low levels of genetic variation and conformation to the central–marginal hypothesis in Taxus wallichiana var. mairei, an endangered conifer endemic to China |
| title_fullStr | Chloroplast population genetics reveals low levels of genetic variation and conformation to the central–marginal hypothesis in Taxus wallichiana var. mairei, an endangered conifer endemic to China |
| title_full_unstemmed | Chloroplast population genetics reveals low levels of genetic variation and conformation to the central–marginal hypothesis in Taxus wallichiana var. mairei, an endangered conifer endemic to China |
| title_short | Chloroplast population genetics reveals low levels of genetic variation and conformation to the central–marginal hypothesis in Taxus wallichiana var. mairei, an endangered conifer endemic to China |
| title_sort | chloroplast population genetics reveals low levels of genetic variation and conformation to the central marginal hypothesis in taxus wallichiana var mairei an endangered conifer endemic to china |
| topic | central–marginal hypothesis climatic variable cpSSRs plastid genetic variation Taxus wallichiana var. mairei |
| url | https://doi.org/10.1002/ece3.5703 |
| work_keys_str_mv | AT liliu chloroplastpopulationgeneticsrevealslowlevelsofgeneticvariationandconformationtothecentralmarginalhypothesisintaxuswallichianavarmaireianendangeredconiferendemictochina AT zhenwang chloroplastpopulationgeneticsrevealslowlevelsofgeneticvariationandconformationtothecentralmarginalhypothesisintaxuswallichianavarmaireianendangeredconiferendemictochina AT lijiehuang chloroplastpopulationgeneticsrevealslowlevelsofgeneticvariationandconformationtothecentralmarginalhypothesisintaxuswallichianavarmaireianendangeredconiferendemictochina AT tingwang chloroplastpopulationgeneticsrevealslowlevelsofgeneticvariationandconformationtothecentralmarginalhypothesisintaxuswallichianavarmaireianendangeredconiferendemictochina AT yingjuansu chloroplastpopulationgeneticsrevealslowlevelsofgeneticvariationandconformationtothecentralmarginalhypothesisintaxuswallichianavarmaireianendangeredconiferendemictochina |