DOI: 10.5061/dryad.bvq83bkf5
title: Dicerandra christmanii demographic data

description: These data files consist of demographic measures taken on marked plants of
 the federally endangered Dicerandra christmanii from natural populations
 (in open gaps and roadsides), an augmented population, and introduced
 population. Data were collected from seven populations across two sites
 from 199 –2018 although populations were initiated in different
 years. 
description: Sampling of the natural population of <em>D.
 christmanii</em> began in 1994 at its only known protected
 population Flamingo Villas Lake Wales Ridge National Wildlife Refuge
 (LWRNWR) owned and managed by the USFWS. Initiated in 1994, plants were
 sampled quarterly (January, April, July and October) at a single
 population (FV north road) within a 45 m by 2 m belt transect with six, 1
 m wide perpendicular transects extending out at various lengths. Sampling
 efforts within the six belt transects were reduced to single 1 x 1 m quads
 in 1996 with plant tags outside the quads or longer transects pulled and
 coded as “no longer in transect” (code 6). Two additional transects were
 added in 1999; FV south road west was a 51 m long, 1 m wide transect and
 FV south road east was a 31 m long, 1 m wide transect. A fourth population
 was added in 2000, FV south gaps, sampling plants in 16 gaps.
 We augmented populations of <em>D.
 christmanii</em> in the southern section of Flamingo Villas LWRNWR
 in 2010 using seeds sown in the field and transplants from cuttings and
 seedlings germinated in a greenhouse. This was an experimental
 augmentation, with some gaps experimentally burned in June 2009 prior to
 the augmentation. Altogether we introduced 4,000 seeds, 160 seedling
 transplants, and 40 stem-cutting transplants into 40 gaps on 19 August
 2010. All gaps were initially watered via a gravity-fed irrigation system;
 irrigation ceased in June 2011. In 2012, we introduced <em>D. christmanii
 </em>plants to Carter Creek LWRNWR, a protected property just north
 of the protected populations at Flamingo Villas LWRNWR. This experimental
 introduction examined the effects of propagule type (transplanted
 seedlings vs. stem cuttings) and supplemental irrigation. Between
 September 12<sup>th</sup> and 13<sup>th</sup>
 2012, a total of 114 transplants from stem cuttings and 102 seedling
 transplants were out-planted into 50 gaps. Half of the plants were
 provided supplemental irrigation, unless sufficient rainfall occurred,
 through the end of 2012. Censuses initially occurred quarterly in
 January, April, July, and October, marking new plants with aluminum tags
 and pin flags and recording survival since the last census. At each
 census, we recorded if a plant had survived, died (for the first time),
 was previously dead, a new plant (previously missed) or a new seedling. In
 October, we took additional measurements, counting the total number of
 branch tips (&gt;2 cm in length) and flowering branch tips. In 2006,
 we stopped sampling in July, in 2012, we stopped sampling in January, and
 in 2014, we stopped sampling in April.
description: All files are CSV extensions and can be opened with most standard
 programs (including Excel and R).