Phylogeography of Bellamya (Mollusca: Gastropoda: Viviparidae) snails on different continents: contrasting patterns of diversification in China and East Africa
PLEISTOCENE CLIMATIC FLUCTUATIONS
; POPULATION GENETIC-STRUCTURE
; FRESH-WATER MOLLUSKS
; MOLECULAR PHYLOGENY
; TIBETAN PLATEAU
; GEOLOGICAL EVENTS
; SPECIES-DIVERSITY
; ASIAN MONSOONS
; LAKE MALAWI
; BIOGEOGRAPHY
WOS学科分类:
Evolutionary Biology
; Genetics & Heredity
WOS研究方向:
Evolutionary Biology
; Genetics & Heredity
英文摘要:
BackgroundSpecies diversity is determined by both local environmental conditions that control differentiation and extinction and the outcome of large-scale processes that affect migration. The latter primarily comprises climatic change and dynamic landscape alteration. In the past few million years, both Southeast Asia and Eastern Africa experienced drastic climatic and geological oscillations: in Southeast Asia, especially in China, the Tibetan Plateau significantly rose up, and the flow of the Yangtze River was reversed. In East Africa, lakes and rivers experienced frequent range expansions and regressions due to the African mega-droughts. To test how such climatic and geological histories of both regions relate to their respective regional species and genetic diversity, a large scale comparative phylogeographic study is essential. Bellamya, a species rich freshwater snail genus that is widely distributed across China and East Africa, represents a suitable model system to address this question. We sequenced mitochondrial and nuclear DNA for members of the genus from China and used published sequences from Africa and some other locations in Asia to investigate their phylogeny and distribution of genetic diversity.ResultsOur phylogenetic analysis revealed two monophyletic groups, one in China and one in East Africa. Within the Chinese group, Bellamya species show little genetic differentiation. In contrast, we observe fairly deep divergence among the East African lakes with almost every lake possessing its unique clade. Our results show that strong divergence does not necessarily depend on intrinsic characteristics of a species, but rather is related to the landscape dynamics of a region.ConclusionOur phylogenetic results suggest that the Bellamya in China and East Africa are independent phylogenetic clades with different evolutionary trajectories. The different climate and geological histories likely contributed to the diverging evolutionary patterns. Repeated range expansions and regressionsof lakes likely contributed to the great divergence of Bellamya in East Africa, while reversal of the river courses and intermingling of different lineages had an opposite effect on Bellamya diversification in China.
1.Hunan Normal Univ, Coll Life Sci, State Key Lab Dev Biol Freshwater Fish, 36 Lushan Rd, Changsha 410081, Hunan, Peoples R China 2.Henan Normal Univ, Coll Fisheries, Engn Technol Res Ctr Henan Prov Aquat Anim Cultiv, Xinxiang 453007, Henan, Peoples R China 3.Univ Hamburg, Ctr Nat Kunde, D-20146 Hamburg, Germany
Recommended Citation:
Gu, Qian H.,Husemann, Martin,Wu, Hui H.,et al. Phylogeography of Bellamya (Mollusca: Gastropoda: Viviparidae) snails on different continents: contrasting patterns of diversification in China and East Africa[J]. BMC EVOLUTIONARY BIOLOGY,2019-01-01,19