A DATA SET is a series of observations collected by the same methodology. Each data set should have documentation sufficient for someone unfamiliar with the research to replicate the study. Data sets may be broken into subsets (data files) that are discrete in space and time, in that order. The documentation for a data set should include all spatial and temporal subdivisions of the data.

(Data, Abstract, Methods, Variables)

NOTES:

• Add rows to tables or lines to paraghaphs as you need them for entering your data.
• Contact emelendez@lternet.edu, if you have any question.

PERSON(S) COMPLETING THIS FORM: E-MAIL ADDRESS:

DATA SET IDENTIFIER: Cecropia growth at El Verde gaps

PROJECT TITLE: Revegetation, Transplants and Fertilization (Disturbance Regime)

PROJECT DESCRIPTION: The goal of this project was to locate and characterize the sites where Cecropia schreberiana saplings and seedlings occur.  I made a one-time survey of about 35 ha of tabonuco forest near El Verde Research Station, in 1989 before Hurricane Hugo.  What little Cecropia regeneration I found was in tree fall gaps, or in open areas along streams.

LTER CORE AREAS: (Annotate all that apply)

Primary Productivity

LEF LTER 1 RESEARCH TOPIC: (Annotate all that apply)

Gap Revegetation

We define a data file as a component of a data set. A data set can have only one data file or more. Basically, different data files have different data structures or format.
DATA SET FILES (SUBSETS):

Data File No.	Data File Identifier	On-Line Filename	Starting Date	Periodicity of sample	End Period
1	Cecropia growth at El Verde gaps	Cecropia.txt	August 1989	once	August 1989

RESEARCH LOCATION:Over about 35 ha at El Verde, Luquillo Experimental Forest

INVESTIGATORS:

PRINCIPAL INVESTIGATORS E-MAIL address

Nick Brokaw

Nbrokaw@lternet.edu

OTHER RESEARCHERS E-MAIL address

Miguel A. García

CONTACT PERSONS E-MAIL address Phone Number (Include area code)

Nick Brokaw

Nbrokaw@lternet.edu

(787) 764-0000 ext.

SOURCE OF FUNDING (SPONSOR): NSF

DATA SET ABSTRACT: While doing the survey of gaps at El Verde the number and height of Cecropia saplings found in gaps where recorded. Since this species is mostly restricted to gaps, an estimate of the total population of Cecropia in the regeneration size classes in the forest can be obtained. (There are others along the edges of the Sonadora and Prieta.) The abundance, dispersion, and size class distribution of the Cecropia population is an index of disturbance in tabonuco forest and make an interesting study in its own right.

DATA SET METHODS: All cecropia encountered were measured as to height.

REFERENCES:
Brokaw, N. V. L. 1982. Treefalls: frequency, timing, and consequences. Pages 101-108 in E. G. Leigh, A. S. Rand, and D. M. Windsor (eds.). The Ecology of a Tropical Forest: Seasonal Rhythms and Long-term Changes. Smithsonian Institution Press, Washington, D.C

CROSS-REFERENCES (other data sets related to this one): none

SAMPLE LOCATION: N/A

STORAGE SITES (of data files): stored with N. Brokaw and also LUQ-LTER Data Manager's File DM-001 , Drawer #1

INVESTIGATOR'S ASSIGNED KEYWORDS: canopy, Puerto Rico, Tabonuco forest, treefall gap

LEF LTER OFFICIAL KEYWORDS (See table): TABONUCO, TREEFALL, TREES, PEER REVIEWED JOURNAL

PUBLICATIONS:
Brokaw, N., S. Fraver, J. S. Grear, J. Thompson, J. K. Zimmerman, R. B. Waide, E. M. Everham III, S. P. Hubbell, and R. B. Foster. Disturbance and canopy structure in two tropical forests. In E. Losos, R. Condit, and J. LaFrankie (eds.). Tropical Forest Diversity and Dynamism: Results from a Long-Term Tropical Forest Network. Smithsonian Institution. In press.

DISSEMINATION: UNRESTRICTED

REASONS TO RESTRICT DATA IN THIS DATA SET BEYOND ITS TWO YEAR POLICY PERIOD*:

*WILL HAVE TO BE APPROVED BY LTER PRINCIPAL INVESTIGATORS: J. ZIMMERMAN, A. LUGO , D.J. LODGE

FILING
___ "File" copy only : Data Management will only file an electronic copy of the data file and its documentation
X "Enter" data on-line : Data Management will be in charge of entering the data on computer files (Contact Eda C. Meléndez

SITES DESCRIPTIONS:

Geographical positional system (GPS) Coordinates for each location:

location	latitude	longitude

VARIABLES (ATTRIBUTES):

FILE NAME OR #ABOVE (all in which the variable appears)	1	1	1	1
ABBREVIATION (as it appears on the data file)	Site	Date	Gap#	Gapdimensions(m)
NAME OF VARIABLE	Site name	Date of observation	Gap number	Size of gap
DEFINITION OF VARIABLE	Location of observation	Date of observation	Number assigned to gap	Length and width of gap
UNIT		meter	N/A	meter
PRECISION		±0.5 m		±0.5 m
RANGE OR LIST OF VALUES	El Verde	2-22 m	1,...,76	2-22 m
DATA TYPE	alphabetic	decimal	integer	decimal
MISSING DATA CODES	No missing data	No missing data	No missing data	No missing data

VARIABLES (ATTRIBUTES): ,No.Cecropia,HtoftallestCecropia(m)

FILE NAME OR #ABOVE (all in which the variable appears)	1	1
ABBREVIATION (as it appears on the data file)	No.Cecropia	HtoftallestCecropia(m)
NAME OF VARIABLE	numbers of Cecropias	Ht. of tallest Cecropia (m)
DEFINITION OF VARIABLE	Count of cecropias plants in gap	Height of tallest Cecropia plant in the gap
UNIT		meter
PRECISION
RANGE OR LIST OF VALUES		0.25-9.5
DATA TYPE	integer	decimal
MISSING DATA CODES	No missing data	No missing data

COMPUTATIONAL METHODS:

Variable Name	Formula

DATE OF LAST REVIEW: May 24, 2007
DATE OF LAST ENTRY: Aug 1989
STAGE OF DATA SET MANAGEMENT (dates):
RECEIVED ENTERED: Nov 2000 Jan 2001
FILED ON-LINE REVIEWED BY RESEARCHER 1995 Feb 2001
FILING MEDIA:
NAME OF DOCUMENTATION FILE: lterdb22.htm
NAME OF ON - LINE CATALOG: LTERDBAS
RECORD #: 22
DOCUMENT TYPE : magnetic media
PRIORITY TO BE ENTERED: N/A

Rev. date of this form: 22 Feb. 2002