ESTIMATING DORMANCY AND SURVIVAL OF A RARE HERBACEOUS PERENNIAL USING MARK–RECAPTURE MODELS

Mark-recapture statistics have rarely been applied to plants, yet they can be useful for estimating plant demographic traits where individuals may be missed or unob- servable. We applied mark-recapture statistics based on an information theory approach to estimate annual probabilities of dormancy in a five-year study of a threatened, perennial plant, the small yellow lady's slipper orchid ( Cypripedium calceolusssp. parviflorum (Sal- isb.) Fernald). The aboveground states of 548 genets in eight patches were monitored over five years. Apparent survival probabilities (f), corrected for dormancy, were calculated. The best-fit model suggested that apparent survival was constant throughout the study for all patches, while dormancy varied additively with time among patches. The mean prob- ability of dormancy was 0.320 6 0.024, with a mean maximum overestimation of 0.067 as calculated using an estimate of the probability of detection. Dormancy typically lasted for no longer than two consecutive years, although dormancy as long as four years was observed. Dormancy displayed a strong covariate relationship with spring frost days, al- though effects of precipitation and mean spring temperature were almost equally strong. Mean apparent survival probabilities were high in each patch ( f5 0.878), but dormancy probabilities varied considerably among patches (d 5 0.188-0.672). Conventional re- sprouting probabilities underestimated apparent survival by a mean difference of 0.288 (range: 0.150-0.589). This novel application of mark-recapture statistics to plant demog- raphy allowed robust survival estimates that accounted for uncertainty due to an unob- servable, dormant life stage.

[1]  David R. Anderson,et al.  Modeling Survival and Testing Biological Hypotheses Using Marked Animals: A Unified Approach with Case Studies , 1992 .

[2]  J. Willems,et al.  Population dynamics and life‐history of Coeloglossum viride (L.) Hartm.: an endangered orchid species in The Netherlands , 1998 .

[3]  K. Pollock.  A Capture-Recapture Design Robust to Unequal Probability of Capture , 1982 .

[4]  M. Bhaskara Rao,et al.  Model Selection and Inference , 2000, Technometrics.

[5]  Miguel Franco,et al.  comparative plant demography - relative importance of life-cycle components to the finite rate of increase in woody and herbaceous perennials , 1993 .

[6]  K. Burnham,et al.  Model selection: An integral part of inference , 1997 .

[7]  Amy W. Ando,et al.  On the Use of Demographic Models of Population Viability in Endangered Species Management , 1998 .

[8]  R. Jefferies,et al.  Approaches to the monitoring of rare plant populations , 1981 .

[9]  J. T. Curtis.  ANNUAL FLUCTUATION IN RATE OF FLOWER PRODUCTION BY NATIVE CYPRIPEDIUMS DURING TWO DECADES1 , 1954 .

[10]  S. Waite,et al.  The phenology of Ophrys sphegodes (the early spider orchid): what annual censuses can miss , 1998 .

[11]  C. Tamm.  Survival and Flowering of Some Perennial Herbs. II. The Behaviour of Some Orchids on Permanent Plots , 1972 .

[12]  L. Mehrhoff.  The Dynamics of Declining Populations of an Endangered Orchid, Isotoria Medeoloides , 1989 .

[13]  C Brownie,et al.  Recent models for mark-recapture and mark-resighting data. , 1987, Biometrics.

[14]  Mark D. Semon,et al.  POSTUSE REVIEW: An Introduction to Error Analysis: The Study of Uncertainties in Physical Measurements , 1982 .

[15]  M. Hutchings.  The population biology of the early spider orchid, Ophrys sphegodes Mill I. A demographic study from 1975 to 1984 , 1987 .

[16]  P. Ascher,et al.  Overcoming Dormancy in Lilium longiflorum Bulblets Produced in Tissue Culture1 , 1982, Journal of the American Society for Horticultural Science.

[17]  C. S. Robbins,et al.  Estimating bird species richness from capture and count data , 1995 .

[18]  Stephen P. Ellner,et al.  Simple Methods for Calculating Age‐Based Life History Parameters for Stage‐Structured Populations , 1992 .

[19]  C. Clark,et al.  Island Extinction Rates from Regular Censuses , 1994 .

[20]  Ingrid M. Parker,et al.  Evaluating approaches to the conservation of rare and endangered plants , 1994 .

[21]  Eric S. Menges,et al.  Population Viability Analysis for an Endangered Plant , 1990 .

[22]  David R. Cox.  The analysis of binary data , 1970 .

[23]  S. Takayama,et al.  Differentiation in Lilium bulbscales grown in vitro. Effects of activated charcoal, physiological age of bulbs and sucrose concentration on differentiation and scale leaf formation in vitro , 1980 .

[24]  J. B. Taft,et al.  VASCULAR FLORA OF THE WETLAND AND PRAIRIE COMMUNITIES OF GAVIN BOG AND PRAIRIE NATURE PRESERVE, LAKE COUNTY, ILLINOIS , 1990 .

[25]  J. T. Curtis.  GERMINATION AND SEEDLING DEVELOPMENT IN FIVE SPECIES OF CYPRIPEDIUM L. , 1943 .

[26]  Norman A. Slade,et al.  APPLICATION OF MARK–RECAPTURE MODELS TO ESTIMATION OF THE POPULATION SIZE OF PLANTS , 1997 .

[27]  James D. Nichols,et al.  Capture-recapture models. , 1992 .

[28]  MODELING COLONY-SITE DYNAMICS: A CASE STUDY OF GULL- BILLED TERNS (STERNA NILOTICA) IN COASTAL VIRGINIA , 1998 .

[29]  J. Wood,et al.  Orchids of the Western Great Lakes Region , 1989 .

[30]  W. Rice.  ANALYZING TABLES OF STATISTICAL TESTS , 1989, Evolution; international journal of organic evolution.

[31]  T. Wells.  Changes in a Population of Spiranthes Spiralis (L.) Chevall. at Knocking Hoe National Nature Reserve, Bedfordshire, 1962-65 , 1967 .

[32]  Kenneth H. Pollock,et al.  Estimating taxonomic diversity, extinction rates, and speciation rates from fossil data using capture-recapture models , 1983, Paleobiology.

[33]  O. T. Solbrig.  Demography and natural selection. , 1980 .

[34]  H. Akaike,et al.  Information Theory and an Extension of the Maximum Likelihood Principle , 1973 .

[35]  M. E. Palmer.  A critical look at rare plant monitoring in the United States , 1987 .

[36]  P. Fiedler,et al.  Rare Plant Demography: Lessons from the Mariposa Lilies (Calochortus: Liliaceae) , 1998 .

[37]  J. Harper,et al.  The Demography of Plants , 1974 .

[38]  David R. Anderson,et al.  Statistical inference from capture data on closed animal populations , 1980 .

[39]  W. Havers,et al.  Demographic properties of an outlier population of Orchis militaris L. (Orchidaceae) in England , 1998 .

[40]  D. Whigham,et al.  The underground phase: a special challenge in studies of terrestrial orchid populations , 1998 .