Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.jaridenv.2004.09.003 |
Influence of climatic variability on local population dynamics of a Sonoran Desert platyopuntia | |
Bowers, JE | |
通讯作者 | Bowers, JE |
来源期刊 | JOURNAL OF ARID ENVIRONMENTS
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ISSN | 0140-1963 |
出版年 | 2005 |
卷号 | 61期号:2页码:193-210 |
英文摘要 | Age-based population dynamics of Opuntia engelmannii, a shrubby cactus with flattened cladodes, were investigated at a Sonoran Desert site protected from grazing since 1907. Demographic statistics were determined from births and deaths on six permanent vegetation plots mapped four times between 1968 and 2001. Moderate longevity (13-56 years) and modest per capita annual survival (0.9298) were associated with fairly rapid turnover; cycles of population growth and decline were thus evident over relatively short periods. Age-frequency distribution, determined for subpopulations in two neighboring habitats in 1996 and 2003, was used to calculate residual regeneration, an index of the difference between observed cohort size and idealized survivorship. Establishment peaks occurred in the late 1970s, the mid-1980s, and the early to mid-1990s and coincided with increased winter moisture in the years before germination, ample summer rain in the year of germination, and decreased drought in the years after germination, reflecting favorable conditions for fruit production, seed germination, and seedling survival. Regionally, pulses and gaps in establishment coincide with the frequency and amplitude of large-scale climatic phenomena that affect cycles of moisture and drought on decadal and interdecadal scales. Because of local factors, however, subpopulations within a few km of one another can experience virtually identical climates yet differ strikingly in age structure and density. (C) 2004 Elsevier Ltd. All rights reserved. |
英文关键词 | demography El Nino-Southern Oscillation longevity Pacific Decadal Oscillation survivorship turnover |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000227111100003 |
WOS关键词 | PRICKLY PEAR CACTUS ; WESTERN UNITED-STATES ; OPUNTIA-ENGELMANNII ; DECADAL VARIABILITY ; VEGETATION CHANGE ; PERENNIAL PLANTS ; GREAT-PLAINS ; PRECIPITATION ; GROWTH ; ENSO |
WOS类目 | Ecology ; Environmental Sciences |
WOS研究方向 | Environmental Sciences & Ecology |
来源机构 | United States Geological Survey |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/149432 |
作者单位 | (1)US Geol Survey, Div Water Resources, Tucson, AZ 85745 USA |
推荐引用方式 GB/T 7714 | Bowers, JE. Influence of climatic variability on local population dynamics of a Sonoran Desert platyopuntia[J]. United States Geological Survey,2005,61(2):193-210. |
APA | Bowers, JE.(2005).Influence of climatic variability on local population dynamics of a Sonoran Desert platyopuntia.JOURNAL OF ARID ENVIRONMENTS,61(2),193-210. |
MLA | Bowers, JE."Influence of climatic variability on local population dynamics of a Sonoran Desert platyopuntia".JOURNAL OF ARID ENVIRONMENTS 61.2(2005):193-210. |
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