Riverine complexity and life history inform restoration in riparian environments in the southwestern United States
Riverine complexity and life history inform restoration in riparian environments in the southwestern United States
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DOI：
10.1111/rec.13418
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发表时间：
2021-07-09
影响因子：
3.2
通讯作者：
Shafroth，Patrick B.
中科院分区：
文献类型：
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作者：
Palmquist，Emily C.;Allan，Gerard J.;Shafroth，Patrick B.
在过去的一个世纪里，美国西南部的河岸栖息地经历了严重的退化，促使对这些关键生态系统进行广泛的管理和恢复。然而，大多数修复工作并没有考虑到可能影响遗传多样性和结构的生活史特征或河流复杂性。本研究利用简单序列重复标记对4种西南河岸物种（白杨、黄柳、黄柳）进行了分析。(1)河流连通性如何与遗传多样性和遗传结构相关？(2)交配系统和扩散机制如何影响基因流动？(3)遗传多样性是否受到单向水流的影响？(4)不受管制的支流和受管制的河流流量如何影响克隆性和相关的多样性？结果表明：(1)不同物种间遗传多样性模式和结构存在显著差异；(2)地理分布包括大型多年生河流的物种遗传结构最少；(3)配偶制度、克隆性和种子传播与遗传结构有关；(4)遗传多样性在物种和种群之间是可变的，但不会单向增加或减少；(5)受管制河流的克隆性和相关多样性与不受管制河流的克隆性和相关多样性无显著差异。我们的多物种方法可以理解河流复杂性和生活史特征如何影响遗传多样性和结构，可以纳入管理工作，使河岸物种与其独特的环境更紧密地匹配，从而促进恢复的成功。
Riparian habitat in the southwestern United States has undergone substantial degradation over the past century, prompting extensive management and restoration of these critical ecosystems. Most restoration efforts, however, do not account for life history traits or riverine complexity that may influence genetic diversity and structure. Here, we use simple sequence repeat markers in four southwestern riparian species (Populus fremontii,Salix gooddingii,S. exigua, andProsopis glandulosa) that occupy a geographically complex region to address four questions: (1) How is river connectivity related to genetic diversity and structure? (2) How do mating systems and dispersal mechanisms influence gene flow? (3) Is genetic diversity influenced by unidirectional water flow? (4) How do unregulated tributary and regulated river flows affect clonality and associated diversity? Our results identify five findings: (1) Patterns of genetic diversity and structure vary substantially across different species; (2) species with geographic distributions that include a large, perennial river exhibit the least genetic structure; (3) mating system, clonality, and seed dispersal are related to genetic structure; (4) genetic diversity is variable among species and populations, but does not increase or decrease unidirectionally; and (5) clonality and associated diversity does not differ along a regulated river relative to unregulated tributaries. Our multispecies approach to understanding how riverine complexity and life history traits influence genetic diversity and structure could be incorporated into management efforts to more closely match riparian species with their unique environments, thereby facilitating restoration success.