A 20-year Long-term Demographic Data of <i>Cirsium undulatum</i> sampled in the Nebraska Sandhills

The study curates demographic information of a short-lived native iterocarpic herb, <i>Cirsium undulatum</i>. This data was collected from 1990 to 2009 at two study sites, Arapaho Prairie Preserves (APP) and Niobrara Valley Preserve (NVP), in the Nebraska Sandhills, USA. At APP, four 12m by 12m plots were established. At NVP, three 12m by 12m plots were established. The data associated with each plot are as described below:1. "UAASOverview19902009RAMET 20230630.xlsx" = Original Transition data for Plot A in APP2. "UABSOverview19902009RAMET 20230630.xlsx" = Original Transition data for Plot B in APP3. "UACSOverview19902009RAMET 20230630.xlsx" = Original Transition data for Plot C in APP4. "UADSOverview19902009RAMET 20230630.xlsx" = Original Transition data for Plot D in APP5. "UNMSOverview19902009RAMET 20230630.xlsx" = Original Transition data for Plot M in NVP6. "UNKSOverview19902009RAMET 20230630.xlsx" = Original Transition data for Plot K in NVP7. "UNLSOverview19902009RAMET 20230630.xlsx" = Original Transition data for Plot L in NVPIn 1990 – 1999, ramets in the plots were monitored twice a year: in early season (May) and in late season (late June - mid July); plots at both sites were examined within one week each year. In 4 years (2000 - 2004), all ramets were measured in late May, but in general, only flowering ramets were remeasured in July; however, some late-season observations were recorded on non-flowering ramets. In 5 years late in the study (2005 – 2009), the ramets were measured only once, in mid- to late-season: in mid-July for 3 years (2005 - 2007) and in late June for two years (2008 - 2009). New ramets observed in 2008 – 2009 at the end of the study were no longer given numerical tags; so, those did not contribute to the estimation of specific stage transition rates.This data is associated with a current ongoing project which examines the time-lag effect of weather variables on the vital rates of <i>Cirsium undulatum.</i><i> </i>The data was collected by Dr. Svata Louda (a retired Professor from the School of Biological Sciences, University of Nebraska, Lincoln) with the help of her collaborators: A. Arnett, T. A. Rand, F. L. Russell, R. W. Otley, 18 graduate students, and 21 undergraduate students over the 20 years. The data provided here was extracted by Dr. Kathleen Keeler (also a retired Professor from the School of Biological Sciences, University of Nebraska, Lincoln) from the field data records.We want to acknowledge that this study was done on the homelands of the Lakota People (Arapaho Prairie Preserve) and of the Ponca People (Niobrara Valley Preserve); we honor this legacy. We are also indebted to The Nature Conservancy, Nebraska Chapter, for permission to work in these reserves and to their incredible staff for all of the support and encouragement provided for the study, especially A. A. Steuter at the beginning of the study.

本研究整理了本土短命多次结实草本<i>Cirsium undulatum</i>的种群统计信息。本数据集于1990年至2009年间，在美国内布拉斯加州沙丘地区的两个研究样地收集完成：阿拉帕霍草原保护区（Arapaho Prairie Preserves, APP）与尼奥布拉拉谷保护区（Niobrara Valley Preserve, NVP）。在阿拉帕霍草原保护区内设置了4块12米×12米的样地，在尼奥布拉拉谷保护区内设置了3块12米×12米的样地。各块样地对应的数据文件说明如下：1. "UAASOverview19902009RAMET 20230630.xlsx"：阿拉帕霍草原保护区样地A的原始转移数据；2. "UABSOverview19902009RAMET 20230630.xlsx"：阿拉帕霍草原保护区样地B的原始转移数据；3. "UACSOverview19902009RAMET 20230630.xlsx"：阿拉帕霍草原保护区样地C的原始转移数据；4. "UADSOverview19902009RAMET 20230630.xlsx"：阿拉帕霍草原保护区样地D的原始转移数据；5. "UNMSOverview19902009RAMET 20230630.xlsx"：尼奥布拉拉谷保护区样地M的原始转移数据；6. "UNKSOverview19902009RAMET 20230630.xlsx"：尼奥布拉拉谷保护区样地K的原始转移数据；7. "UNLSOverview19902009RAMET 20230630.xlsx"：尼奥布拉拉谷保护区样地L的原始转移数据。1990年至1999年期间，每年对样地内的分株（ramet）开展两次监测：分别于生长季早期（5月）与生长季晚期（6月末至7月中旬）；两个保护区的样地每年均在一周内完成调查。2000年至2004年的4年间，所有分株均在5月末进行测量，但通常仅在7月对开花分株进行复测；不过也有部分晚期观测记录了非开花分株的相关信息。研究后期的2005年至2009年的5年间，仅在生长季中晚期开展一次分株测量：2005年至2007年的3年为7月中旬，2008年至2009年的2年为6月末。2008年至2009年研究末期观测到的新生分株未被赋予数字标签，因此这些分株数据未用于特定阶段转移率的估算。本数据集关联于一项当前仍在进行的研究项目，该项目旨在探究气象变量对<i>Cirsium undulatum</i>生活史特征速率的时滞效应。本数据集由内布拉斯加大学林肯分校生物科学学院退休教授Svata Louda博士，联合其合作者A. Arnett、T. A. Rand、F. L. Russell、R. W. Otley，以及18名研究生与21名本科生，耗时20年收集完成。本次提供的数据由内布拉斯加大学林肯分校生物科学学院退休教授Kathleen Keeler博士从野外记录数据中提取得到。本研究的开展地原为拉科塔族（阿拉帕霍草原保护区）与庞卡族（尼奥布拉拉谷保护区）的故土，我们谨此致敬这一文化遗产。同时，我们衷心感谢内布拉斯加分会自然保护协会（The Nature Conservancy, Nebraska Chapter）允许我们在上述保护区开展研究，并感谢其全体工作人员为本研究提供的鼎力支持与鼓励，尤其感谢研究初期的A. A. Steuter。