Higher ploidy is associated with reduced range breadth in the Potentilleae tribe

Brittingham, Hayley A.; Koski, Matthew H.; Ashman, Tia‐Lynn

doi:10.1002/ajb2.1046

Cited by 19 publications

(18 citation statements)

References 103 publications

(133 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The higher polyploids (6× and 12× cytotypes) have diverged towards environmental margins and occur in specialized and mostly nonoverlapping niches with regard to the other cytotypes. This niche divergence pattern is similar to that found in a broad survey within the tribe Potentilleae of the Rosaceae family, which included > 100 species and six different ploidy levels (Brittingham et al ., ). In D. broteri , 6× and 12× niches were characterized by the most extreme conditions (high temperatures and scarce water availability) of the Mediterranean climate.…”

Section: Discussionmentioning

confidence: 97%

Niche divergence and limits to expansion in the high polyploid Dianthus broteri complex

2019

View full text Add to dashboard Cite

Summary Niche evolution in plant polyploids remains controversial and evidence for alternative patterns has been reported. Using the autopolyploid Dianthus broteri complex (2×, 4×, 6× and 12×) as a model, we aimed to integrate three scenarios – competitive exclusion, recurrent origins of cytotypes and niche filling – into a single framework of polyploid niche evolution. We hypothesized that high polyploids would tend to evolve towards extreme niches when low ploidy cytotypes have nearly filled the niche space. We used several ecoinformatics and phylogenetic comparative analyses to quantify differences in the ecological niche of each cytotype and to evaluate alternative models of niche evolution. Each cytotype in this complex occupied a distinct ecological niche. The distributions were mainly constrained by soil characteristics, temperature and drought stress imposed by the Mediterranean climate. Tetraploids had the highest niche breadth and overlap due to their multiple origins, whereas the higher ploidy cytotypes were found in different, restricted, nonoverlapping niches. Niche evolution analyses suggested a scenario with one niche optimum for each ploidy, including the two independent tetraploid lineages. Our results suggest that the fate of nascent polyploids could not be predicted without accounting for phylogenetic relatedness, recurrent origins or the niche occupied by ancestors.

show abstract

Section: Discussionmentioning

confidence: 97%

Niche divergence and limits to expansion in the high polyploid Dianthus broteri complex

2019

View full text Add to dashboard Cite

show abstract

“…In a study of the genus Phalaris , there was no general support for broader niche breadths of polyploids (Visser and Molofsky, ), and in Primula , climatic niches of polyploid species were narrower than those of diploid species (Theodoridis et al., ). In the Potentilleae tribe of the Rosaceae, transitions to higher ploidy are actually associated with reduced range size and abiotic breadth (Brittingham et al., ).…”

Section: Discussionmentioning

confidence: 99%

“…However, maintaining large genomes also presents metabolic costs for polyploid cytotypes that can result in lower growth rates (Otto, 2007;Neiman et al, 2013;Guignard et al, 2016). Little is known about the ecological consequences of different levels of polyploidy (Brittingham et al, 2018).…”

mentioning

confidence: 99%

Ecological niche differences between two polyploid cytotypes ofSaxifraga rosacea

Decanter

Colling

Elvinger

et al. 2020

American J of Botany

View full text Add to dashboard Cite

Premise Different cytotypes of a species may differ in their morphology, phenology, physiology, and their tolerance of extreme environments. We studied the ecological niches of two subspecies of Saxifraga rosacea with different ploidy levels: the hexaploid Central European endemic subspecies sponhemica and the more widely distributed octoploid subspecies rosacea. Methods For both cytotypes, we recorded local environmental conditions and mean plant trait values in populations across their areas of distribution, analyzed their distributions by niche modeling, studied their performance at two transplant sites with contrasting conditions, and experimentally tested their cold resistance. Results Mean annual temperature was higher in hexaploid than in octoploid populations and experiments indicated that frost tolerance of the hexaploid is lower than that of the octoploid. Reproduction of octoploids from Central Europe was higher than that of hexaploids at a transplant site in subarctic Iceland, whereas the opposite was true in temperate Luxembourg, indicating adaptation of the octoploids to colder conditions. Temperature variables were also most important in niche models predicting the distribution of the two cytotypes. Genetic differences in survival among populations were larger for the octoploids than for the hexaploids in both field gardens, suggesting that greater genetic variability may contribute to the octoploid's larger distributional range. Conclusions Our results support the hypotheses that different cytotypes may have different niches leading to spatial segregation, and that higher ploidy levels can result in a broader ecological niche and greater tolerance of more extreme conditions.

show abstract

“…Numerous studies have also addressed whether plant polyploidy is associated with increases in abiotic niche breadth, yet no clear patterns have emerged (Husband et al, 2013;Glennon et al, 2014;Brittingham et al, 2018). Although some polyploid plant taxa occupy larger abiotic niches than their diploid progenitors (Lowry & Lester, 2006;Coughlan et al, 2017), others occupy different or smaller niches (Ramsey, 2011;Brittingham et al, 2018). Additional studies testing how polyploidy shapes niche breadth of both biotic and abiotic interactions are needed to elucidate broad patterns and clarify underlying mechanisms.…”

Section: Discussionmentioning

confidence: 99%

Polyploid plants obtain greater fitness benefits from a nutrient acquisition mutualism

et al. 2020

Self Cite

View full text Add to dashboard Cite

Polyploidy is a key driver of ecological and evolutionary processes in plants, yet little is known about its effects on biotic interactions. This gap in knowledge is especially profound for nutrient acquisition mutualisms, despite the fact that they regulate global nutrient cycles and structure ecosystems. Generalism in mutualistic interactions depends on the range of potential partners (niche breadth), the benefits obtained and ability to maintain benefits across a variety of partners (fitness plasticity). Here, we determine how each of these is influenced by polyploidy in the legume-rhizobium mutualism. We inoculated a broad geographic sample of natural diploid and autotetraploid alfalfa (Medicago sativa) lineages with a diverse panel of Sinorhizobium bacterial symbionts. To analyze the extent and mechanism of generalism, we measured host growth benefits and functional traits. Autotetraploid plants obtained greater fitness enhancement from mutualistic interactions and were better able to maintain this across diverse rhizobial partners (i.e. low plasticity in fitness) relative to diploids. These benefits were not attributed to increases in niche breadth, but instead reflect increased rewards from investment in the mutualism. Polyploid plants displayed greater generalization in bacterial mutualisms relative to diploids, illustrating another axis of advantage for polyploids over diploids.

show abstract

Higher ploidy is associated with reduced range breadth in the Potentilleae tribe

Cited by 19 publications

References 103 publications

Niche divergence and limits to expansion in the high polyploid Dianthus broteri complex

Niche divergence and limits to expansion in the high polyploid Dianthus broteri complex

Ecological niche differences between two polyploid cytotypes ofSaxifraga rosacea

Polyploid plants obtain greater fitness benefits from a nutrient acquisition mutualism

Contact Info

Product

Resources

About