<br>对于西部草原流苏兰花（Platanthera praeclara Sheviak & Bowles）来说，降水会影响植物高度，但不会影响繁殖力：来自植物标本室记录的证据。,Ecology and Evolution

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对于西部草原流苏兰花（Platanthera praeclara Sheviak & Bowles）来说，降水会影响植物高度，但不会影响繁殖力：来自植物标本室记录的证据。
Ecology and Evolution ( IF 2.3 ) Pub Date : 2020-08-09 , DOI: 10.1002/ece3.6647
Lori A Biederman ₁ , Sydney M Weldon ₁ , Derek S Anderson ₂ , Mark J Leoschke ₃

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西部流苏草原兰花 (WFPO) 是一种稀有植物，生长于美国大平原和中西部地区的中温至湿润高草草原。 WFPO种群规模每年变化很大，研究表明种群规模取决于植物年度发育关键时期的降水量。我们假设植物高度和繁殖努力也将受到降水的控制，无论是在这些时期还是在更广泛的时期。我们从 21 个植物标本室获取了 WFPO 的可用图像，尽管某些种群/年份组合出现了多次，但其中 141 种植物的信息足以进行分析。对于每个样本，我们测量了植物高度（厘米）和繁殖努力（通过总花和芽数来测量）。我们使用自举线性回归，从每个种群/年份组合中随机选择一个个体，来比较关键时期和各种摘要期间的降水模型。我们发现物候关键时期的降水量不能很好地预测植物高度和繁殖努力。在更广泛的降水变量中，从 1 月 1 日到采集日期的累积降水量最能描述植物高度。我们还使用相关性来检测变量 WFPO 高度、繁殖努力、降水量、纬度和收集年份之间的关系。标本采集年份与 WFPO 株高和累积降水量呈负相关，表明近年来两者均呈下降趋势。与纬度的负相关性还表明 WFPO 范围北部的高度和降水量减少。繁殖努力与测试的降水变量无关；然而，它与株高的相关性较弱。尽管结果有限，但本研究利用现有数据并在广泛的时间范围（1894-2012）和纬度（37.5°-49.9°）内对 WFPO 生物学进行推断。

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Precipitation contributes to plant height, but not reproductive effort, for western prairie fringed orchid (Platanthera praeclara Sheviak & Bowles): Evidence from herbarium records.

The western fringed prairie orchid (WFPO) is a rare plant found in mesic to wet tallgrass prairies in the Great Plains and Midwest regions of the United States. The size of WFPO populations varies considerably from year to year, and studies have suggested that population size is dependent on precipitation during critical periods in the plant's annual development. We hypothesized that plant height and reproductive effort would also be controlled by precipitation, either during these periods or over a broader period. We acquired available images of WFPO from 21 herbaria, and of these 141 individual plants had information adequate for analysis, although some population/year combinations were represented multiple times. For each specimen, we measured plant height (cm) and reproductive effort (as measured by total flower and bud count). We used bootstrapped linear regression, randomly selecting one individual from each population/year combination, to compare precipitation models, both during critical periods and the various summaries. We found that precipitation during the phenologically critical periods was a poor predictor of plant height and reproductive effort. Of the broader precipitation variables, accumulated precipitation from January 1 to collection date best described plant height. We also used correlations to detect a relationship among the variables WFPO height, reproductive effort, precipitation, latitude, and year of collection. Year of specimen collection was negatively correlated with WFPO plant height and accumulated precipitation, suggesting that both have declined in more recent years. Negative correlations with latitude also suggest height and precipitation decrease in the northern part of WFPO's range. Reproductive effort was not related to tested precipitation variables; however, it was weakly correlated with plant height. Although the results are limited, this study leverages available data and makes inferences on WFPO biology over broad ranges of time (1894–2012) and latitude (37.5°–49.9°).

更新日期：2020-09-14

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