Different Patterns of Ecological Divergence Between Two Tetraploids and Their Diploid Counterpart in a Parapatric Linear Coastal Distribution Polyploid Complex

Castro, Mariana; Loureiro, João; Figueiredo, Albano; Serrano, Miguel; Husband, Brian C.; Castro, Sílvia

doi:10.3389/fpls.2020.00315

Cited by 25 publications

(29 citation statements)

References 95 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This was also indirectly supported by the fact that mixed‐ploidy sites with a markedly higher degree of spatial intermingling of diploids and tetraploids (e.g., AA225) never exhibited higher frequencies of triploids. A considerable proportion of individuals of intermediate ploidy were observed in zones of cytotype sympatry in other sexual autopolyploid complexes (Husband and Schemske, 1998; Burton and Husband, 1999; Trávníček et al, 2011; Čertner et al, 2017), while in other systems triploids were missing (Soltis, 1984; Lumaret et al, 1987; Wolf et al, 1990; Hülber et al, 2015; Castro et al, 2020). It is likely that both extrinsic parameters of the contact zones (spatial arrangement and colonization history) and intrinsic properties of the species (phenological differentiation, strength of pollen tube incompatibilities, or postzygotic barriers; Köhler et al, 2010; Vallejo‐Marín et al, 2016; Alexander, 2020) govern the varying strength of the interploidy hybridization across different species.…”

Section: Discussionmentioning

confidence: 99%

“…Ecological niche modeling has been used to quantitatively characterize the environmental niche of a cytotype based on abiotic variables (e.g., altitude, aspect, precipitation, temperature, soil characteristics) (Glennon, 2014; Visger et al, 2016; Čertner et al, 2019; Castro et al, 2019; López‐Jurado et al, 2019; Molina‐Henao and Hopkins, 2019; Castro et al, 2020). However, the extent to which ploidy differentiation translates to niche differentiation remains debatable (Mallet, 2007; Parisod and Broennimann, 2016; Baniaga et al, 2019).…”

mentioning

confidence: 99%

See 1 more Smart Citation

Niche similarity in diploid‐autotetraploid contact zones ofArabidopsis arenosaacross spatial scales

Morgan

Čertner

Lučanová

et al. 2020

American J of Botany

View full text Add to dashboard Cite

Whole genome duplication is a major evolutionary event, but its role in ecological divergence remains equivocal. When populations of different ploidy (cytotypes) overlap in space, "contact zones" are formed, allowing the study of evolutionary mechanisms contributing toward ploidy divergence. Multiple contact zones per species' range are often described but rarely leveraged as natural replicates. We explored whether the strength of niche differentiation of diploid and autotetraploid Arabidopsis arenosa varies over distinct contact zones and if the frequency of triploids decreases from seedling to adult stage. METHODS: We characterized ploidy composition and habitat preferences in 264 populations across three contact zones using climatic niche modeling. Ecological differences of cytotypes were also assessed using local vegetation surveys at 110 populations within two contact zones, and at the finer scale within five mixed-ploidy sites. This was complemented by flow cytometry of seedlings. RESULTS: We found no niche differences between diploid and tetraploid populations within contact zones for either climatic or local environmental variables. Comparisons of cytotypes within mixed-ploidy sites found weak niche differences that were inconsistent in direction. Triploid individuals were virtually absent (0.14%) in the field, and they were at a similarly low frequency (0.2%) in ex situ germinated seedlings. CONCLUSIONS: This study demonstrates the strength in investigating different spatial scales across several contact zones when addressing ecological niche differentiation between ploidies. The lack of consistent habitat differentiation of ploidies across the scales and locations supports the recently emerging picture that processes other than ecological differentiation may underlie ploidy coexistence in diploid-autopolyploid systems.

show abstract

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Niche similarity in diploid‐autotetraploid contact zones ofArabidopsis arenosaacross spatial scales

Morgan

Čertner

Lučanová

et al. 2020

American J of Botany

View full text Add to dashboard Cite

show abstract

“…& Reut. (López-Jurado et al, 2019 ) and Jasione maritima (Duby) Merino (Castro et al, 2020 ). Our previous study of genome size variation in A. oleraceum cytotypes revealed a remarkably complex pattern both within and between cytotypes (Duchoslav et al, 2013 ).…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, it has been evidenced repeatedly that polyploids (prevalently tetraploids) have a broader niche or may differ in their niche optima from their diploid progenitors (Soltis and Soltis, 1995 , 2000 ; Levin, 2002 ; Weiss-Schneeweiss et al, 2013 ; Ramsey and Ramsey, 2014 ; Baniaga et al, 2020 ). They are reported to have a stronger colonization ability (Treier et al, 2009 ), including invasion potential (Pandit et al, 2006 , 2011 ), and increased ability to cope with environmental extremes better, especially at higher latitudes and elevations, and in arid or artificially disturbed habitats (Grant, 1981 ; Stebbins, 1984 ; Brochmann et al, 2004 ; Wu et al, 2010 ; Ramsey, 2011 ; Manzaneda et al, 2012 ; te Beest et al, 2012 ; Muñoz-Pajares et al, 2018 ; Rice et al, 2019 ; Castro et al, 2020 ; Decanter et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Intricate Distribution Patterns of Six Cytotypes of Allium oleraceum at a Continental Scale: Niche Expansion and Innovation Followed by Niche Contraction With Increasing Ploidy Level

et al. 2020

View full text Add to dashboard Cite

The establishment and success of polyploids are thought to often be facilitated by ecological niche differentiation from diploids. Unfortunately, most studies compared diploids and polyploids, ignoring variation in ploidy level in polyploids. To fill this gap, we performed a large-scale study of 11,163 samples from 1,283 populations of the polyploid perennial geophyte Allium oleraceum with reported mixed-ploidy populations, revealed distribution ranges of cytotypes, assessed their niches and explored the pattern of niche change with increasing ploidy level. Altogether, six ploidy levels (3x−8x) were identified. The most common were pentaploids (53.6%) followed by hexaploids (22.7%) and tetraploids (21.6%). Higher cytotype diversity was found at lower latitudes than at higher latitudes (>52° N), where only tetraploids and pentaploids occurred. We detected 17.4% of mixed-ploidy populations, usually as a combination of two, rarely of three, cytotypes. The majority of mixed-ploidy populations were found in zones of sympatry of the participating cytotypes, suggesting they have arisen through migration (secondary contact zone). Using coarse-grained variables (climate, soil), we found evidence of both niche expansion and innovation in tetraploids related to triploids, whereas higher ploidy levels showed almost zero niche expansion, but a trend of increased niche unfilling of tetraploids. Niche unfilling in higher ploidy levels was caused by a contraction of niche envelopes toward lower continentality of the climate and resulted in a gradual decrease of niche breadth and a gradual shift in niche optima. Field-recorded data indicated wide habitat breadth of tetraploids and pentaploids, but also a pattern of increasing synanthropy in higher ploidy levels. Wide niche breadth of tetra- and pentaploids might be related to their multiple origins from different environmental conditions, higher “age”, and retained sexuality, which likely preserve their adaptive potential. In contrast, other cytotypes with narrower niches are mostly asexual, probably originating from a limited range of contrasting environments. Persistence of local ploidy mixtures could be enabled by the perenniality of A. oleraceum and its prevalence of vegetative reproduction, facilitating the establishment and decreasing exclusion of minority cytotype due to its reproductive costs. Vegetative reproduction might also significantly accelerate colonization of new areas, including recolonization of previously glaciated areas.

show abstract

“…& Reut. (López-Jurado et al, 2019) and Jasione maritima (Duby) Merino (Castro et al, 2020). Our previous study of genome size variation in A. oleraceum cytotypes revealed a remarkably complex pattern both within and between cytotypes (Duchoslav et al, 2013).…”

Section: Role Of Niche Differentiationmentioning

confidence: 92%

Table_2.XLS

View full text Add to dashboard Cite

Different Patterns of Ecological Divergence Between Two Tetraploids and Their Diploid Counterpart in a Parapatric Linear Coastal Distribution Polyploid Complex

Cited by 25 publications

References 95 publications

Niche similarity in diploid‐autotetraploid contact zones ofArabidopsis arenosaacross spatial scales

Niche similarity in diploid‐autotetraploid contact zones ofArabidopsis arenosaacross spatial scales

Intricate Distribution Patterns of Six Cytotypes of Allium oleraceum at a Continental Scale: Niche Expansion and Innovation Followed by Niche Contraction With Increasing Ploidy Level

Table_2.XLS

Contact Info

Product

Resources

About