Demographic analysis of dormancy and survival in the terrestrial orchid Cypripedium reginae

被引:68
作者
Kéry, M
Gregg, KB
机构
[1] US Geol Survey, Patuxent Wildlife Res Ctr, Laurel, MD 20708 USA
[2] Swiss Ornithol Inst, CH-6204 Sempach, Switzerland
[3] W Virginia Wesleyan Coll, Buckhannon, WV 26201 USA
关键词
capture-recapture; climate; Cypripedium reginae; demographic analysis; dormancy; herbivory; lag; population dynamics; survival;
D O I
10.1111/j.0022-0477.2004.00885.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
1 We use capture-recapture models to estimate the fraction of dormant ramets, survival and state transition rates, and to identify factors affecting these rates, for the terrestrial orchid Cypripedium reginae. We studied two populations in West Virginia, USA, for 11 years and investigated relationships between grazing and demography. Abe Run's population was small, with moderate herbivory by deer and relatively constant population size. The population at Big Draft was of medium size, with heavy deer grazing, and a sharply declining number of flowering plants up to the spring before our study started, when the population was fenced. 2 We observed dormant episodes lasting from 1 to 4 years. At Abe Run and Big Draft, 32.5% and 7.4% of ramets, respectively, were dormant at least once during the study period for an average of 1.6 and 1.3 years, respectively. We estimated the annual fraction of ramets in the dormant state at 12.3% (95% CI 9.5-15.8%) at Abe Run and at 1.8% (95% CI 1.2-2.6%) at Big Draft. Transition rates between the dormant, vegetative and flowering life-states did not vary between years in either population. Most surviving ramets remained in the same state from one year to the next. Survival rates were constant at Abe Run (0.96, 95% CI 0.93-0.97), but varied between years at Big Draft (0.89-0.99, mean 0.95). 3 At Big Draft, we found neither a temporal trend in survival after cessation of grazing, nor relationships between survival and the number of spring frost days or cumulative precipitation during the current or the previous 12 months. However, analysis of precipitation on a 3-month basis revealed a positive relationship between survival and precipitation during the spring (March-May) of the previous year. 4 Relationship between climate and the population dynamics of orchids may have to be studied with a fine temporal resolution, and considering possible time lags. Capture-recapture modelling provides a comprehensive and flexible framework for demographic analysis of plants with dormancy.
引用
收藏
页码:686 / 695
页数:10
相关论文
共 55 条
[1]  
Alexander HM, 1997, ECOLOGY, V78, P1230, DOI 10.1890/0012-9658(1997)078[1230:AOMRMT]2.0.CO
[2]  
2
[3]  
[Anonymous], 1967, MICH BOT
[4]  
[Anonymous], 1974, Introduction to the Theory of Statistics
[5]  
ARNASON A N, 1973, Researches on Population Ecology (Tokyo), V15, P1
[6]   CAPTURE-RECAPTURE STUDIES FOR MULTIPLE STRATA INCLUDING NON-MARKOVIAN TRANSITIONS [J].
BROWNIE, C ;
HINES, JE ;
NICHOLS, JD ;
POLLOCK, KH ;
HESTBECK, JB .
BIOMETRICS, 1993, 49 (04) :1173-1187
[7]   Dynamics of island populations of Cypripedium calceolus in the Biebrza river valley (north-east Poland) [J].
Brzosko, E .
BOTANICAL JOURNAL OF THE LINNEAN SOCIETY, 2002, 139 (01) :67-77
[8]  
Burnham K. P., 1998, MODEL SELECTION INFE
[9]   Detecting parameter redundancy [J].
Catchpole, EA ;
Morgan, BJT .
BIOMETRIKA, 1997, 84 (01) :187-196
[10]  
CHOQUET R, 2003, USERS MANUAL M SURGE