Divergence and reproductive isolation between two closely related allopatric Iris species

Volis, Sergei; Zhang, Yonghong; Deng, Tao; Dorman, Michael; Blecher, Michael; Abbott, Richard J.

doi:10.1093/biolinnean/blz014

Cited by 13 publications

(12 citation statements)

References 25 publications

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“…This study confirms the hypothesis that the role of pre-zygotic barriers, especially eco-geography, is more significant in speciation [ 3 ]. More specifically, we provide strong evidence for the hypotheses raised in previous studies that species divergence in the Oncocyclus species complex is driven by the eco-geographic barrier [ 35 , 36 ].…”

Section: Discussionsupporting

confidence: 76%

“…Partial post-zygotic RI among populations was shown within Iris atropurpurea , one of the species in the group [ 34 ]. Recent studies [ 35 , 36 ] have found no post-zygotic reproductive isolation, with eco-geography as the main barrier enforcing isolation between four species. Altogether, evidence supports the hypothesis that the royal irises are in the course of speciation [ 37 ].…”

Section: Introductionmentioning

confidence: 99%

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Eco-Geography and Phenology Are the Major Drivers of Reproductive Isolation in the Royal Irises, a Species Complex in the Course of Speciation

Osmolovsky

Shifrin

Gamliel

et al. 2022

Plants

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The continuous nature of speciation implies that different species are found at different stages of divergence, from no- to complete reproductive isolation. This process and its underlying mechanisms are best viewed in incipient species. Moreover, the species complex can offer unique insight into how reproductive isolation (RI) has evolved. The royal irises (Iris section Oncocyclus) are a young group of species in the course of speciation, providing an ideal system for speciation study. We quantified pre- and post-zygotic reproductive barriers between the eight Israeli species of this complex and estimated the total RI among them. We tested for both pre-pollination and post-pollination reproductive barriers. Pre-pollination barriers, i.e., eco-geographic divergence and phenological differentiation were the major contributors to RI among the Iris species. On the other hand, post-pollination barriers, namely pollen–stigma interactions, fruit set, and seed viability had negligible contributions to total RI. The strength of RI was not uniform across the species complex, suggesting that species may have diverged at different rates. Overall, this study in a young, recently diverged group of species provides insight into the first steps of speciation, suggesting a crucial role of the pre-zygotic barriers.

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Section: Discussionsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Eco-Geography and Phenology Are the Major Drivers of Reproductive Isolation in the Royal Irises, a Species Complex in the Course of Speciation

Osmolovsky

Shifrin

Gamliel

et al. 2022

Plants

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Section: Predicted Suitable Habitats Using Both Climatic and Soil Varmentioning

confidence: 99%

“…Within a suitable climate niche, the distribution of a species may be restrained by soil conditions. Thus, a number of studies included both climate and soil variables in the same models [20,21]. However, the inclusion of soil variables in a niche-based model may compromise the role of climatic variables or soil variables due to correlations between the variables in the two categories [39].…”

Section: Predicted Suitable Habitats Using Both Climatic and Soil Varmentioning

confidence: 99%

Predicting Suitable Habitats of Camptotheca acuminata Considering Both Climatic and Soil Variables

Feng

Sun

Shi

et al. 2020

Forests

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Camptotheca acuminata is considered a natural medicinal plant with antitumor activity. The assessment of climate change impact on its suitable habitats is important for cultivation and conservation. In this study, we applied a novel approach to build ecological niche models with both climate and soil variables while the confounding effects between the variables in the two categories were avoided. We found that the degree-days below zero and mean annual precipitation were the most important climatic factors, while the basic soil saturation, soil gravel volume percentage, and clay content were the main soil factors, determining the suitable habitats of C. acuminata. We found that suitable habitats of this species would moderately increase in future climates under both the RCP4.5 and RCP8.5 climate change scenarios for the 2020s, 2050s, and 2080s. However, substantial shifts among levels of habitat suitability were projected. The dual high-suitable habitats would expand, which would be favorable for commercial plantations. Our findings contribute to a better understanding of the impact of climate change on this species and provide a scientific basis for the cultivation and conservation purposes.

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“…Speciation is the origin of reproductive isolation and divergence between populations (Mayr, 1963). Isolation by physical and/or ecological barriers is an important driver in allopatric processes that may lead to population differentiation and, ultimately, speciation (Volis et al, 2019). Other processes such as hybridization and introgression between involved species in the secondary contact zones may also have important evolutionary consequences for speciation, especially at the early stages of speciation when reproductive barriers may be weak (Bertrand et al, 2017;Cortés-Ortiz et al, 2019;Coyner et al, 2015;Sardell & Uy, 2016;Souissi et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Climate warming will increase chances of hybridization and introgression between two Takydromus lizards (Lacertidae)

Guo

Zhong

Xie

et al. 2021

Ecology and Evolution

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Coexisting species may experience population and range changes alone or jointly in response to environmental change. Here, we used six climate variables and ten modeling algorithms to predict the distribution of two Takydromus species ( T . septentrionalis and T . sexlineatus ) in China. We identified the sympatric and allopatric areas by comparing projections between the two species based on habitat suitability under present and future climate scenarios. We constructed the hypervolumes of six climate variables for the two species and then evaluated overlaps between hypervolumes. From this study, we know the following. First, minimum temperature of coldest month contributes the most to the prediction of habitat suitability. Second, habitats suitable for the two species will shift northward in response to climate warming. Third, the range of T. sexlineatus will expand across the four future time intervals before 2,100, namely the 2021–2040, 2041–2060, 2061–2080, and 2081–2100 intervals, under both Shared socioeconomic pathway (SSP) 245 and SSP585 scenarios, and the range of T. septentrionalis will also expand in the future except at the 2081–2100 interval under the SSP585 scenario. Fourth, the sympatric areas will contract or expand under the SSP245 scenario and expand across the four future time intervals before 2,100 under the SSP585 scenario. Fifth, the niche hypervolumes of the two species partially overlapped, and the differences in niche centroid show some degree of niche differentiation between the two species. These results allow to conclude that climate warming will not only drive the northward drift of sympatric areas but also increase the size of these areas if nothing is done to limit the emission of greenhouse gases. Given the existence of hybridization and introgression between T. septentrionalis and T. sexlineatus in the field where they coexist, we also conclude that climate warming will increase chances of hybridization and introgression between the two species.

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Divergence and reproductive isolation between two closely related allopatric Iris species

Cited by 13 publications

References 25 publications

Eco-Geography and Phenology Are the Major Drivers of Reproductive Isolation in the Royal Irises, a Species Complex in the Course of Speciation

Eco-Geography and Phenology Are the Major Drivers of Reproductive Isolation in the Royal Irises, a Species Complex in the Course of Speciation

Predicting Suitable Habitats of Camptotheca acuminata Considering Both Climatic and Soil Variables

Climate warming will increase chances of hybridization and introgression between two Takydromus lizards (Lacertidae)

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