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LTREB: Collaborative Research: Cyclic vs. anthropogenic causes of long-term variation in the regeneration of tropical forests with contrasting latitude and diversity

LTREB：合作研究：具有对比纬度和多样性的热带森林再生长期变化的循环与人为原因

基本信息

批准号：
1754632
负责人：
Nancy Garwood
金额：
$ 2.03万
依托单位：
Southern Illinois University at Carbondale
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-07-15 至 2024-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1754632&HistoricalAwards=false
关键词：
LTREB Collaborative Research Cyclic vs.

项目摘要

Tropical forests are globally important because of their high biodiversity and large contributions to carbon storage. This project studies the timing and success of reproduction in tropical forest plants. Tropical species may use cues of seasonal shifts (for example, in rainfall or light availability) to time the start of reproduction, perhaps to ensure their seeds are dispersed during conditions that will be favorable for the growth and survival of young seedlings. Rainfall, light availability, temperature, and other environmental conditions influence each stage of reproduction- flowering, fruit maturation, seed dispersal, and seedling growth. Beneficial conditions for reproduction can vary within a year, due to seasonality, and among years, due to climate cycles like El Nino. This project focuses on long term data in order to capture periods when conditions are better or worse for various types of plants. The research takes place at multiple tropical forest study sites to separate the effects of local weather variability from large regional climate patterns. By measuring the cues tropical plants use to start reproduction and examining which environmental conditions affect seedling growth and survival, the long-term data from this project will strengthen our ability to predict the future of tropical forests and the benefits these forests confer to society. Training of multiple undergraduate students will occur at the sites, by each of the collaborating universities.These long-term studies will enable tests of hypotheses concerning: (1) what are the environmental cues that induce flowering; (2) how is reproduction in tropical forests affected by disturbances such as wind storms, droughts, and by natural climate cycles such as the El Nino Southern Oscillation, the North Atlantic Oscillation, and the Atlantic Multidecadal Oscillation, which vary at subdecadal to multidecadal time scales; (3) how do species with different traits (e.g., small vs. large seeds, soft vs. dense wood) respond to environmental variation; and (4) how does episodic reproduction ramify through to the structure of adult populations. This research approach will effectively close the demographic gap between studies of early reproduction and the dynamics of sapling and adult tree populations. At each of the field sites, species-specific flower, fruit and seed rain is recorded multiple times each year using seed traps. Additionally, all woody seedlings are recorded in an annual census of hundreds of 1-m2 plots adjacent to seed traps, at each site. The trap and plot censuses take place within large mapped forest dynamics plots where all trees 1 cm in diameter are identified and regularly measured.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

热带森林因其高度的生物多样性和对碳储存的巨大贡献而具有全球重要性。该项目研究热带森林植物繁殖的时机和成功。热带物种可能会利用季节变化的线索（例如降雨或光照）来确定繁殖开始的时间，也许是为了确保它们的种子在有利于幼苗生长和存活的条件下传播。降雨、光照、温度和其他环境条件影响着繁殖的每个阶段-开花、果实成熟、种子传播和幼苗生长。繁殖的有利条件在一年之内可能会因季节性而变化，而在几年之间，由于厄尔尼诺等气候周期而变化。该项目侧重于长期数据，以捕捉各种类型工厂的条件更好或更差的时期。该研究在多个热带森林研究地点进行，以将当地天气变化的影响与大的区域气候模式分开。通过测量热带植物用于开始繁殖的线索，并检查哪些环境条件影响幼苗生长和存活，该项目的长期数据将加强我们预测热带森林未来的能力，以及这些森林给社会带来的好处。这些长期的研究将对以下假设进行检验：（1）什么是诱导开花的环境因素;（2）热带森林的繁殖如何受到风暴、干旱等干扰以及厄尔尼诺南方涛动、北大西洋涛动等自然气候周期的影响，和大西洋多年代际振荡，在亚年代际到多年代际的时间尺度上变化;（3）具有不同特征的物种（例如，小与大的种子，软与密集的木材）对环境变化的反应;（4）如何通过成年种群的结构，情节生殖分支。这种研究方法将有效地缩小早期繁殖研究与幼树和成年树种群动态之间的人口差距。在每一个实地，每年都用种子收集器多次记录特定物种的花、果和种子雨。此外，所有木本幼苗记录在每年普查的数百个1平方米的地块附近的种子陷阱，在每个网站。陷阱和小区普查在大型森林动态图中进行，所有直径1厘米的树木都被识别并定期测量。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

期刊论文数量（17）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Beyond the fast-slow continuum: demographic dimensions structuring a tropical tree community.

DOI：
10.1111/ele.12974
发表时间：
2018-07
期刊：
Ecology letters
影响因子：
8.8
作者：
N. Rüger;L. Comita;L. Comita;Richard Condit;Richard Condit;D. Purves;B. Rosenbaum;M. Visser;S. Wright;Christian Wirth;Christian Wirth
通讯作者：
N. Rüger;L. Comita;L. Comita;Richard Condit;Richard Condit;D. Purves;B. Rosenbaum;M. Visser;S. Wright;Christian Wirth;Christian Wirth

A phenology model for tropical species that flower multiple times each year

每年多次开花的热带物种的物候模型

DOI：
10.1111/1440-1703.1017
发表时间：
2019
期刊：
Ecological Research
影响因子：
2
作者：
Wright, S. Joseph;Calderón, Osvaldo;Muller-Landau, Helene C.
通讯作者：
Muller-Landau, Helene C.

Army ant males lose seasonality at a site on the equator

赤道上的雄性行军蚁失去了季节性

DOI：
10.1111/btp.13192
发表时间：
2023
期刊：
Biotropica
影响因子：
2.1
作者：
Tozetto, Leonardo;Forrister, Dale L.;Duval, Megan;Hays, Tobias;Garwood, Nancy C.;Castro, Ronald Vargas;Lattke, John E.;Sendoya, Sebastian;Longino, John T.
通讯作者：
Longino, John T.

Rainforest phenology: flower, fruit and seed production from biweekly collections of 200 traps in the Yasuní Forest Dynamics Plot, Ecuador, 2000-2018

雨林物候学：2000-2018 年厄瓜多尔亚苏尼森林动态图中每两周收集 200 个陷阱的花朵、果实和种子产量