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Transition and recruitment data for Lepanthes eltoroensis

Source: R/L_elto.R
L_elto.Rd

Individual-level census data from multiple populations of the epiphytic orchid Lepanthes eltoroensis Stimson, a critically rare species endemic to Puerto Rico. Individuals were permanently marked and surveyed at 6-month intervals over 12 census periods (6 calendar years). Each row represents one individual observed at one census period.

Usage

data(L_elto)

Format

A data frame with 5233 rows and 13 variables:

POPNUM

Integer. Population identifier number.

year

Integer. Census period number (each period represents a 6-month interval, not a calendar year; periods range from 1 to 12).

seedlings

Numeric. Population-level count of plantulas (seedlings, stage "p") observed in the population at this census period. The same value is repeated for all individuals in the same population-period combination.

adults

Numeric. Population-level count of adults (stage "a") observed in the population at this census period. The same value is repeated for all individuals in the same population-period combination.

fertility

Numeric. Mean per-individual fertility: average number of seedlings produced per adult in the population at this census period.

IND_NUM

Integer. Unique individual plant identifier number within its population.

stage

Character. Life history stage of the individual at the current census: "p" (plantula/seedling), "j" (juvenile), or "a" (adult). See Details for stage definitions.

next_stage

Character. Life history stage of the individual at the following 6-month census: "p", "j", "a", or "m" (muerto/dead). See Details for stage definitions.

first_year

Integer. 6-month census period number when the individual was first observed (1 = first survey).

last_year

Integer. 6-month census period number when the individual was last observed alive.

recruited

Logical. TRUE if this individual was newly recruited into the population (not present at the previous survey), typically via sexual reproduction. All individuals at the first census period (year == 1) are TRUE by definition as there is no prior survey for comparison.

died

Logical. Whether the individual was found dead at this census period.

lifespan

Integer. Total number of 6-month census periods during which the individual was observed alive (not in calendar years).

Source

Raymond L. Tremblay, University of Puerto Rico at Humacao, unpublished data.

Details

Life history stages are coded as follows:

  • "p" - plantula (seedling): individuals without a lepanthiform sheet on any of the leaves

  • "j" - juvenile: individuals with no evidence of present or past reproductive effort; bases of inflorescences are persistent

  • "a" - adult: individuals with active or inactive inflorescences present

  • "m" - muerto (dead): individual was dead at the following census (used only in next_stage)

References

Tremblay, R.L. and Hutchings, M.J. (2003). Population dynamics in orchid conservation: a review of analytical methods based on the rare species Lepanthes eltoroensis. In: Dixon, K.W. et al. (eds.) Orchid Conservation. Natural History Publications (Borneo), pp. 183–204.

Tremblay, R.L., Perez, M-E., Tyre, A.J. and Tenhumberg, B. (2021). Bayesian estimates for matrix population models of rare plants. Ecological Modelling, 440, 109526. doi:10.1016/j.ecolmodel.2021.109526