uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read doi:10.6073/pasta/21158257a32ce12cd6f014785b7baf5e Aaron Ellison https://orcid.org/0000-0003-4151-6081 Nicholas Gotelli https://orcid.org/0000-0002-5409-7456 2023 English

The northern pitcher plant Sarracenia purpurea is a model system for forecasting extinction risk in the face of environmental change. We have monitored demographic variables of two mapped cohorts of S. purpurea in ombrotrophic bogs of northern New England from 1997-2005 (Hawley Bog, Massachusetts) and 1997-present (Molly Bog, Vermont). Growth, survivorship, and reproduction are in close balance, and matrix-models with four life stages (seeds, seedlings/juvenile plants, non-flowering adult plants, flowering adults) predicted population growth rates close to zero, with long doubling times. To further assess seed-to-seedling transitions, we measured and weighed Sarracenia seeds, and conducted a greenhouse experiment on density-dependent dynamics of newly germinated seedlings of S. purpurea.

carnivorous plants demography extinction population dynamics LTER controlled vocabulary populations LTER core area Harvard Forest HFR LTER USA HFR default

This dataset is released to the public under Creative Commons CC0 1.0 (No Rights Reserved). Please keep the dataset creators informed of any plans to use the dataset. Consultation with the original investigators is strongly encouraged. Publications and data products that make use of the dataset should include proper acknowledgement.

Creative Commons Zero v1.0 Universal https://spdx.org/licenses/CC0-1.0.html CC0-1.0 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf202 Hawley Bog (Hawley MA), Molly Bog (Morristown VT). Coordinates based on WGS84 datum. -72.88972 -72.63944 +44.49917 +42.57528 236 543 meter 1997 2021 genus Endothenia species daeckeana pitcher plant moth genus Exyra species fax pitcher plant moth genus Papaipema species appassionata pitcher plant borer genus Sarracenia species purpurea northern pitcher plant complete Information Manager Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 hf-im@lists.fas.harvard.edu Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 (978) 724-3595 https://harvardforest.fas.harvard.edu

In fall 1997, we located and tagged 400 S. purpurea plants at Hawley Bog and 444 plants at Molly Bog (400 in one area, 44 in another area of the bog); one-half of each marked cohort were "adult" plants (rosette diameters greater than 100 mm), the other half were "juvenile" plants (rosette diameters less than 100 mm). Each year since then (through 2005 at Hawley Bog, when the population was trampled by moose), plants are relocated and measured (as described in A. M. Ellison and N. J. Gotelli, 2001, Proc. Nat. Acad. Sci. 99: 4409-4412), and flowering status, and whether or not the plant has been damaged by herbivores noted. Plants were mapped with transit and stadia rods in 1999.

Mature seeds of S. purpurea and other recognized species of Sarracenia were collected in the field. Maximum length and width of 100-200 seeds of each species were measured with an ocular micrometer at 100x magnification under a dissecting microscope. A random subset of 20 seeds of each species were individually weighed to the nearest 10 ug.

In September 1998, 1000 S. purpurea seeds were randomly scattered in a planting bed (3 x 1 x 0.25 m) filled with milled Sphagnum. Germinated seedlings were individually flagged with toothpicks, and their location was mapped (+- 1 mm). The number of seedling leaves, plant diameter, length of longest leaf, and rosette diameter of each plant were measured in May 1999, June 1999, August 1999, May 2000, June 2000, August 2000, September 2001, and August 2002. Surviving plants in August 2002 were harvested, dried, and weighed after separating roots and shoots. The flowers from the three flowering plants were also dried and weighed.

Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 (978) 724-3595 https://harvardforest.fas.harvard.edu https://ror.org/059cpzx98 pointOfContact The Harvard Forest Long-Term Ecological Research (LTER) program examines ecological dynamics in the New England region resulting from natural disturbances, environmental change, and human impacts. National Science Foundation LTER grants: DEB-8811764, DEB-9411975, DEB-0080592, DEB-0620443, DEB-1237491, DEB-1832210. hf202-01-sarr-dem.csv Sarracenica demography data (1997-2021) hf202-01-sarr-dem.csv 470233 c0813f2af3f0ca3440ebb21ccd32abb4 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p20/hf202/hf202-01-sarr-dem.csv site site name Molly Molly Bog, Vermont Hawley Hawley Bog, Massachusetts plant.num plant number plant number init.stage initial stage A Adult (rosette > 10cm) J Juvenile (rosette < 10cm) group group, R, G (Molly) – two spatially separate populations; H (dummy variable for Hawley) R Molly G Molly H dummy variable for Hawley year sample year YYYY pitchers number of pitchers number 1 whole NA missing value phyllodes number of phyllodes number 1 whole NA missing value buds number of buds (since 2000) number 1 whole NA missing value flowers number of flowers number 1 whole NA missing value fruits number of fruits number 1 whole NA missing value damage damage to flower/fruit (not taken in 2000) 0 none A abort H herbivory P moth damage by Papaipema PE moth damage by Papaipema + Endothenia E moth damage by Endothenia rosette rosette diamter (since 1998) millimeter 0.01 real NA missing value leaf.len length of leaf (since 1998) millimeter 0.01 real NA missing value diam1 mouth diameter (since 1998) millimeter 0.01 real NA missing value diam2 mouth diameter (since 1998) millimeter 0.01 real NA missing value tube tube width at widest point (since 2001) millimeter 0.01 real NA missing value keel keel width at widest point (since 2001) millimeter 0.01 real NA missing value censor censoring status for survivorship analysis (Hawley since 2005, Molly since 2008) 1 alive 0 known dead -1 plant missing (cannot assume dead) 7900 hf202-02-plant-coords.csv Hawley and Molly plant coordinates hf202-02-plant-coords.csv 10982 42f390c9c910063dbf8391cad8b48aac 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p20/hf202/hf202-02-plant-coords.csv site site name Hawley Hawley Bog, Massachusetts Molly Molly Bog, Vermont plant.num plant number plant number group group, R, G (Molly) – two spatially separate populations; H (dummy variable for Hawley) H dummy variable for Hawley R Molly G Molly x location in meters (from survey origin) meter 0.01 real NA missing value y location in meters (from survey origin) meter 0.01 real NA missing value 444 hf202-03-sarr-seed-size.csv Sarracenia seed size data (1997-1998) hf202-03-sarr-seed-size.csv 36077 838e4b61c78b59d362905f39e6b16d54 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p20/hf202/hf202-03-sarr-seed-size.csv species species of Sarracenia; one of alata, flava, leucophylla, minor, psittacina, purpurea_purpurea, purpurea_venosa, rubra species of Sarracenia length seed length millimeter 0.01 real NA missing value width seed width millimeter 0.01 real NA missing value mass seed mass (for subset of each species) gram 0.00001 real NA missing value 1402 hf202-04-sarr-dd-coords.csv Sarracenia density-dependence coordinates hf202-04-sarr-dd-coords.csv 12359 703368171ce2f9b9edfa55a3e2871902 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p20/hf202/hf202-04-sarr-dd-coords.csv plant.no plant number (matches value in hf202-05-sarr-dd-meas.csv) plant number x.mm x coordinate of location of plant millimeter 1 whole NA missing value y.mm y coordinate of location of plant millimeter 1 whole NA missing value 915 hf202-05-sarr-dd-meas.csv Sarracenia density-dependence measurements hf202-05-sarr-dd-meas.csv 305145 9fed1dfd07f0e68628e3d12a44cca985 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p20/hf202/hf202-05-sarr-dd-meas.csv plant.no plant number (matches value in hf202-04-sarr-dd-coords.csv) plant number date date YYYY-MM-DD measure measurement nleaves number of leaves leaflen length of longest leaf rosette rosette diameter leafdiam1 diameter of pitcher opening; measured in 2001 only); leafdiam2 diameter of pitcher opening, perpendicular to leafdiam1, measured in 2001 only shootmass oven-dried mass of shoot at harvest in 2002 rootmass oven-dried mass of roots at harvest in 2002 flowermass oven-dried mass of flower at harvest in 2002 units units of measurement count count mm millimeters g grams value value of measurement value of measurement 9776 biodiversity conservation community long-term measurement modeling https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf159