Polyploidy impacts population growth and competition with diploids: multigenerational experiments reveal key life‐history trade‐offs
Polyploidy impacts population growth and competition with diploids: multigenerational experiments reveal key life‐history trade‐offs
复制标题
多倍体影响人口增长以及与二倍体的竞争：多代实验揭示了关键的生命与历史权衡
DOI：
10.1111/nph.18794
复制
发表时间：
2023
期刊：
影响因子：
9.4
通讯作者：
Turcotte, Martin M.
中科院分区：
文献类型：
--
作者：
Anneberg, Thomas J.;O'Neill, Elizabeth M.;Ashman, Tia‐Lynn;Turcotte, Martin M.
生态学理论预测，早代多倍体（“新多倍体”）由于稀有和与二倍体祖先竞争的缺点，应该很快灭绝。然而，多倍体仍然存在于全球的自然栖息地中。这一悖论已在理论上得到解决，认识到新多倍体的生殖保证和生态位分化可以促进建立。尽管如此，多倍体在种群水平上的直接影响仍然在很大程度上未经测试，尽管建立是一个内在的种群水平的过程。我们进行了种群水平的实验，在四个谱系对二倍体和合成同源四倍体的水生植物多根螺旋藻中跟踪当前和未来生长的生活史投资。在一系列营养处理中，对二倍体和新多倍体之间存在竞争和不存在竞争的情况下的种群增长进行了评估。虽然新多倍体种群产生更多的生物量，但当单独生长或在所有营养处理中竞争时，它们达到较低的种群规模，并降低了承载能力。因此，与个体水平的研究相反，我们的群体水平数据表明，新多倍体在竞争力上劣于二倍体。相反，新多倍体种群有更大的投资，在休眠繁殖体生产比diploids.Our研究结果表明，新多倍体种群不应该坚持根据目前的增长动态，但高潜力的未来增长可能会允许多倍体在随后的季节建立。
Ecological theory predicts that early generation polyploids (‘neopolyploids’) should quickly go extinct owing to the disadvantages of rarity and competition with their diploid progenitors. However, polyploids persist in natural habitats globally. This paradox has been addressed theoretically by recognizing that reproductive assurance of neopolyploids and niche differentiation can promote establishment. Despite this, the direct effects of polyploidy at the population level remain largely untested despite establishment being an intrinsically population‐level process.We conducted population‐level experiments where life‐history investment in current and future growth was tracked in four lineage pairs of diploids and synthetic autotetraploids of the aquatic plantSpirodela polyrhiza. Population growth was evaluated with and without competition between diploids and neopolyploids across a range of nutrient treatments.Although neopolyploid populations produce more biomass, they reach lower population sizes and have reduced carrying capacities when growing alone or in competition across all nutrient treatments. Thus, contrary to individual‐level studies, our population‐level data suggest that neopolyploids are competitively inferior to diploids. Conversely, neopolyploid populations have greater investment in dormant propagule production than diploids.Our results show that neopolyploid populations should not persist based on current growth dynamics, but high potential future growth may allow polyploids to establish in subsequent seasons.