环境因素会影响墨西哥特有和濒危橡树布兰德盖栎的空间聚集和橡子生产

IF 1.1 4区 生物学 Q3 PLANT SCIENCES Botanical Sciences Pub Date : 2023-06-07 DOI:10.17129/botsci.3309
Carolyn Brinckwirth, C. Klimas, Camila Cortez, Janet Nuῆez, Daniel W. Pérez-Morales, A. Breceda, A. González‐Rodríguez, S. Álvarez-Clare
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引用次数: 0

摘要

背景和研究物种:墨西哥下加利福尼亚特有的濒临灭绝的栎树(Quercus brandegeei Goldman),由于其传统分布局限于短暂的河床,种群数量下降,缺乏幼苗再生,因此受到威胁。虽然有证据表明橡子生产可行,但在整个发生范围内没有发现该物种的幼苗或树苗。假设:我们测试了空间聚集和决定橡子产量的因素,假设在降水较多的地区,布氏栎树之间的距离较小,树木属性和气候变量将共同决定橡子的存在。方法:我们对12个种群和194个个体进行了Ripley’s K分析,以确定每个种群的空间格局(随机、均匀、聚集)。为了找出环境因子对橡子产量的影响,我们对8个气候变量进行了一系列广义线性模型。结果:Ripley’s K分析结果显示,布氏柽柳是一种高度聚集的物种,聚集率最高的区域为0 ~ 25 m。区域而不是气候线索被发现是橡子存在的重要决定因素。结论:在一些种群中,高聚集性和低橡子产量的证据表明,该物种存在生态位消耗,这种消耗仅限于沿短暂河床的非常特定的微点。在该地区预测的更炎热和更干燥的气候下,合适的招聘面积可能会进一步减少。
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Environmental factors can influence spatial aggregation and acorn production in the endemic and endangered oak Quercus brandegeei in Mexico
Background and study species: The endangered oak Quercus brandegeei Goldman, endemic to Baja California Sur, Mexico, is threatened because of its relictual distribution restricted to ephemeral riverbeds, declining populations, and a lack of seedling regeneration. Although there is evidence of viable acorn production, no seedlings or saplings have been found across the range of occurrence for this species. Hypothesis: We tested for spatial aggregation and factors determining acorn production, hypothesizing that Q. brandegeei trees would be less distant from one another in regions with higher precipitation and that tree attributes and climatic variables would co-determine acorn presence. Study site and dates: Baja California Sur, Mexico, 2016-2017 Methods: We conducted a Ripley’s K analysis to determine each population’s spatial pattern (random, uniform, clumped) across 12 populations and a total of 194 individuals. To find the impact of environmental factors on acorn production we conducted a series of generalized linear models on eight climatic variables. Results: Ripley’s K analysis revealed that Q. brandegeei is a highly clumped species, with the highest rate of aggregation occurring within 0-25 meters. Region but not climatic cues were found to be important determinants of presence of acorns. Conclusions: High aggregation in clumps and low evidence of acorn production in some populations suggests that there is a niche attrition for this species, which is confined to very specific microsites along ephemeral riverbeds. Suitable recruitment areas could be reduced even further under the hotter and drier climate predicted for the region.
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来源期刊
Botanical Sciences
Botanical Sciences Agricultural and Biological Sciences-Plant Science
CiteScore
1.90
自引率
21.40%
发文量
71
审稿时长
16 weeks
期刊介绍: Botanical Sciences welcomes contributions that present original, previously unpublished results in Botany, including disciplines such as ecology and evolution, structure and function, systematics and taxonomy, in addition to other areas related to the study of plants. Research reviews are also accepted if they summarize recent advances in a subject, discipline, area, or developmental trend of botany; these should include an analytical, critical, and interpretative approach to a specific topic. Acceptance for reviews will be evaluated first by the Review Editor. Opinion Notes and Book Reviews are also published as long as a relevant contribution in the study of Botany is explained and supported.
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