密克罗克苏铁性状对安松栎木慢性食草性的响应

IF 1.7 Q3 ECOLOGY
Ecologies Pub Date : 2023-06-04 DOI:10.3390/ecologies4020024
T. Marler, L. Terry
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引用次数: 0

摘要

Aulacaspis yasumatsui Takagi于2003年入侵关岛,并导致当地小苏铁K.D.Hill种群的广泛死亡。20年后,幸存树木种群的再生仍然受到限制,观察巨型树特征的变化可能会为未来有关再生的保护管理决策提供信息。为了满足这一需求,我们量化了2001年至2022年的大蠊繁殖努力和产出。2006年,大孢子叶数量下降了29%,胚珠数量下降了73%。繁殖产量也受到了损害,因为结实率下降了56%,每粒球果的种子数量下降了88%。到2022年,这些繁殖力指标几乎没有恢复的迹象。我们的研究结果表明,长期的A.yasumtasui侵扰,加上其他入侵性食草动物的威胁,通过持续减少胚珠产量和每株大球果的结实率,损害了寄主微小弯孢菌的种群,从而损害了再生。这种植物对生物威胁的反应不同于成熟树木和新兴幼苗的持续死亡。可能需要采取保护干预措施,以促进在未来帮助微小弯孢菌恢复的过程中恢复充分的再生。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Cycas micronesica Megastrobilus Traits Respond to Chronic Herbivory by Aulacaspis yasumatsui
Aulacaspis yasumatsui Takagi invaded Guam in 2003 and caused the widespread mortality of the indigenous Cycas micronesica K.D. Hill population. The regeneration of the surviving tree population continues to be constrained 20 years later, and a look at the changes in megastrobili traits may inform future conservation management decisions concerning regeneration. We quantified megastrobilus reproductive effort and output from 2001 to 2022 to address this need. The reproductive effort of each megastrobilus was immediately reduced by the invasion, as the number of megasporophylls declined by 29%, and the number of ovules declined by 73% in 2006. Reproductive output was also damaged, as the percent seed set declined by 56% and the number of seeds per strobilus declined by 88%. These fecundity metrics have shown few signs of recovery through 2022. Our results reveal that chronic A. yasumatsui infestations, combined with other invasive herbivore threats, have damaged the host C. micronesica population through a sustained reduction in ovule production and the percent seed set for each megastrobilus, thereby impairing regeneration. This plant response to the biotic threats is distinct from the ongoing mortality of mature trees and emerging seedlings. Conservation interventions may be required to foster a return to adequate regeneration during future attempts to aid C. micronesica recovery.
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CiteScore
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