Arid
DOI10.1016/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
ISSN0140-1963
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
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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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