A sterol-mediated gleaner–opportunist trade-off underlies the evolution of grazer resistance to cyanobacteria
A sterol-mediated gleaner–opportunist trade-off underlies the evolution of grazer resistance to cyanobacteria
复制标题
甾醇介导的拾取者与机会主义权衡是食草动物对蓝藻抗性进化的基础
DOI:
10.1098/rspb.2022.0178
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
D. Martin-Creuzburg
中科院分区:
文献类型:
--
作者:
Isanta-Navarro;T. Klauschies;A. Wacker ;D. Martin-Creuzburg
The human-caused proliferation of cyanobacteria severely impacts consumers in freshwater ecosystems. Toxicity is often singled out as the sole trait to which consumers can adapt, even though cyanobacteria are not necessarily toxic and the lack of nutritionally critical sterols in cyanobacteria is known to impair consumers. We studied the relative significance of toxicity and dietary sterol deficiency in driving the evolution of grazer resistance to cyanobacteria in a large lake with a well-documented history of eutrophication and oligotrophication. Resurrecting decades-oldDaphniagenotypes from the sediment allowed us to show that the evolution and subsequent loss of grazer resistance to cyanobacteria involved an adaptation to changes in both toxicity and dietary sterol availability. The adaptation ofDaphniato changes in cyanobacteria abundance revealed a sterol-mediated gleaner–opportunist trade-off. Genotypes from peak-eutrophic periods showed a higher affinity for dietary sterols at the cost of a lower maximum growth rate, whereas genotypes from more oligotrophic periods showed a lower affinity for dietary sterols in favour of a higher maximum growth rate. Our data corroborate the significance of sterols as limiting nutrients in aquatic food webs and highlight the applicability of the gleaner–opportunist trade-off for reconstructing eco-evolutionary processes.
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