遗传漂变反对种群空间扩展过程中的互利共生
Genetic drift opposes mutualism during spatial population expansion
摘要：
互惠互动对双方都有利，促进共存和遗传多样性〈动〉性<动>。空间结构可以促进合作，但空间扩张也可能使互惠的伙伴很难呆在一起，因为扩张前沿的遗传漂变创造了低遗传和物种多样性〈动〉性<动>的区域。为了探索互惠共生和遗传漂变之间的拮抗作用，我们培养了芽殖酵母S.酿酒酵母在琼脂表面作为模型的互惠经历空间扩张。通过提供不同数量的交换养分，我们调整了互惠互动的强度和对称性。强互利共生在空间扩展过程中抑制遗传分离，从而保持多样性，但弱或不对称互利共生被遗传漂变所压倒，即使互利共生仍然是有益的，减缓增长和减少多样性。使用实验测量参数的理论建模预测了分层区域的大小，以及互利主义必须有多强才能在空间扩张中生存下来。
英文摘要：
Mutualistic interactions benefit both partners, promoting coexistence and genetic diversity. Spatial structure can promote cooperation, but spatial expansions may also make it hard for mutualistic partners to stay together, since genetic drift at the expansion front creates regions of low genetic and species diversity. To explore the antagonism between mutualism and genetic drift, we grew cross-feeding strains of the budding yeast S. cerevisiae on agar surfaces as a model for mutualists undergoing spatial expansions. By supplying varying amounts of the exchanged nutrients, we tuned strength and symmetry of the mutualistic interaction. Strong mutualism suppresses genetic demixing during spatial expansions and thereby maintains diversity, but weak or asymmetric mutualism is overwhelmed by genetic drift even when mutualism is still beneficial, slowing growth and reducing diversity. Theoretical modeling using experimentally measured parameters predicts the size of demixed regions and how strong mutualism must be to survive a spatial expansion.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
