Recruitment varies among milkweed seed sources for habitat specialist but not generalist
Recruitment varies among milkweed seed sources for habitat specialist but not generalist
复制标题
栖息地专家的马利筋种子来源不同，但通才的招聘情况不同
DOI：
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发表时间：
2022
影响因子：
3.2
通讯作者：
Kayri Havens
中科院分区：
文献类型：
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作者：
Jessamine Finch;Alexandra E. Seglias;A. Kramer;Kayri Havens
如果能够实现足够的幼苗建立，基于种子的恢复提供了一种负担得起的，积极的恢复方法，可以快速大规模实施。然而，建立已成为一个主要的恢复瓶颈，强调需要更好地了解种子发芽生态位和网站条件的相互作用。发芽生态位宽度（NB）预计将增加基因流，导致更广泛的环境耐受范围，降低敏感性的网站条件，并减少种子来源之间的变化。为了研究发芽NB如何与种子建立中的种间和种内变异相关，我们比较了两种马利筋（马利筋）的田间招募，马利筋是帝王蝶的幼虫宿主植物，因此是栖息地创造的高优先级群体。与来自实验室试验的物种级NB一致，有强有力的证据表明，栖息地专家（Asclepias incarnata）的早期生命阶段在种子采集区域（相隔423-572 km）之间存在差异，但没有证据表明通才（A.在大约750 km的样带中收集的种子来源之间存在差异。再生趋势表明A. incarnata对种子源明显更敏感，因此需要更严格的种子区。然而，气候变化可能需要我们将种子收集区与种子应用区分开，颠覆种子转移区的传统框架。在特定分类群的研究确定了适应性和表型变异的规模之前，恢复工作者应该继续根据已知影响基因流的物种特征，如丰度和栖息地特异性，调整乳草和其他分类群的种子收集区的规模。
If sufficient seedling establishment can be achieved, seed‐based restoration provides an affordable, active restoration approach that can be implemented quickly at scale. However, establishment has served as a major restoration bottleneck, highlighting the need for improved understanding of seed germination niche and interactions with site conditions. Germination niche breadth (NB) is expected to increase with gene flow, resulting in broader environmental tolerance range, reduced sensitivity to site conditions, and less variation among seed sources. To investigate how germination NB relates to inter‐ and intraspecific variation in establishment from seed, we compared field recruitment for two milkweeds (Asclepias), the larval host plant of the monarch butterfly and thus a high priority group for habitat creation. Consistent with species‐level NB derived from laboratory trials, there was strong evidence that early life stages of the habitat specialist (Asclepias incarnata) varied among seed collection regions (separated by 423–572 km) but no evidence that the generalist (A. syriaca) varied among seed sources collected across an approximately 750‐km transect. Regeneration trends demonstrate that A. incarnata is significantly more sensitive to seed source and therefore requires more restricted seed zones. However, climate change may necessitate that we separate seed collection zones from seed application zones, upending the traditional framework of seed transfer zones. Until taxon‐specific studies have identified the scale of adaptive, phenotypic variance, restoration practitioners should continue to adjust the scale of seed collection zones for milkweeds and other taxa based on species traits known to influence gene flow, such as abundance and habitat specificity.