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(802) 656-0683femc@uvm.eduwww.uvm.edu/femcUniversity of Maine Holt Research ForestleadLongterm observations of two fern species. Annual variation in fern leaf production, leaf size, spore production and other observed characteristics. Plant observations from annual fall monitoring visits begun in the year 2000 and completed in 2019. Data should not be used without first contacting the researcher for more detail and updates (January 2020). Forest Ecosystem Monitoring CooperativeJoanneSharpeprincipalInvestigatorLongterm observations of two fern species. Annual variation in fern leaf production, leaf size, spore production, and other observed characteristics. Plant observations from annual fall monitoring visit begun in the year 2000 and completed in 2019Fern ObservationsLongterm observations of two fern species. Annual variation in fern leaf production, leaf size, spore production and other observed characteristics. Plant observations from annual fall monitoring visits begun in the year 2000 and completed in 2019. Data should not be used without first contacting the researcher for more detail and updates (January 2020). VMC.1632.3307mySQL/femc/data/archive/project/hrfferns/dataset/fern-observations2000-01-012019-12-31BLOCKBLOCKHolt Forest research area major subdivisions (100m x 100m): number (south-north coordinate) + letter (north-south coordinate) textBROKENBROKENCode for no leaf on plant being full length, but shortened because of breakage or insect damage below the tip of the leaf.F11. B = broken leaf.textEATENEATENSori (with spores inside) are attacked at some point during the year, probably by insect larvae, creating a "smeared" effect on the back of leaves and occasional brown spots on the top of the leaves. Y = sori destroyedtextFERTILEFERTILECount of the leaves on the monitored plant that had spore bearing stuctures (sorus, pl sori) on the bottom surface of the leafintmeternatural016FIMFIMNumber of leaves on monitored plant that were fertile, but by the monitoring date (Sept/Oct) the sori were not yet mature (leaf assumed to have emerged mid-summer)intmeternatural15FLAFLAPlants were assigned an ID number when first monitored 1; a white flag marked with the number (Sharpie) was put in the ground near the plant and re-marked or replaced as needed throughout the study. Not all numbers between 1 and 849 were used to identify the 719 plants in the study.intmeternatural1854INSECT_LF_COUNTINSECT_LF_COUNTNumber of leaves on monitored plant with development that had been stopped by an insect (type unknown) that at some point along the rachis "rolled" the remaining developing pairs of leaflets into a "ball"; usually occurred at about leaflet pair 3 or 4 counting from the bottom, and leaflet pairs belointmeternatural16LENGTHLENGTHSum of long petiole length and lamina length measurementsintmeternatural386LAMLAMLength of the lamina of the longest leaf on plantintmeterinteger161LOCATION_NOTESLOCATION_NOTESNotes about plant locations printed on data sheets used for each year's monitoring: usually in relation to other flagged plants and may have changed from year to year to improve the plant location processtextPETPETLength of the petiole of the longest leaf on plantintmeterinteger134PROFILEPROFILECode indicating plants in each study subquadrat that were randomly selected during the first year of the survey for extra measurements. These plants had ALL leaves measured to obtain info on the relationship between longest leaf length and mean leaf length for plants with that longest measured leaf.textXPlant selectedNPlant not selectedPRSPRSCount of pairs of leaflets (toward tip until merged into a terminal leaflet) in the lamina on longest leaf of plant; noted from the beginning of study (2000) through 2011 and again in 2019 onlyintmeterinteger121QUADQUADHolt forest major block divisions (50m x 50m), four per blockintSORAL_COUNTSORAL_COUNTCount of the number of pairs of leaflets with sori on the longest fertile leaf measured (0 = terminal only, blank = sterile leaf or data for this variable not collected)intmeterinteger017SPSPAbbreviation for the two species of fern monitored in this study. DI = Dryopteris intermedia and DM = Dryopteris marginalistextDMITIS #17541, woodfern (Dryopteris marginalis)DIITIS #17538, intermediate woodfern (Dryopteris intermedia)STATCODESTATCODECode indicating that the plant has died, was missing or not surveyed. textNSnot surveyed during year (2018 only) MI5missed measuring plant for 5 consecutive yearsMI4missed measuring plant for 4 consecutive yearsMI3missed measuring plant for 3 consecutive yearsMI2missed measuring plant for 2 consecutive yearsMI1missed measuring plant for 1 consecutive yearsG2gone within past two years if monitoring missed previous year (2019 only)G1gone within past yearALplant alive and monitoredSTATYEARSTATYEARFirst survey year for plant (STATCODE = AL) or first survey year that plant is gone (STATCODE = G) or year that plant was missing (STCODE = MIn) though found alive in subsequent surveysdateYYYYSTERILESTERILECount of the leaves on the monitored plant that did NOT have spore bearing stuctures (sorus, pl sori) on the bottom surface of the leaf (includes observations of leaflets on broken leaves as well where the tip of the leaf may have been fertile)intmeterinteger09SUBQIDSUBQIDAssigned sequence number (1-20) for sample units (subquadrats) used in THIS study (BLOCK-QUAD-SUBQ combination (eg 1 = F321, 2 = 3F23…20 = 8C44))intSUBQUADSUBQUADHolt forest minor block subdivisions (25m x 25m), four per block; basic "study plot" sampling area in THIS studyintTYPE_LEAFTYPE_LEAFOn fertile plants where the longest leaf was not fertile, this code indicates that a sterile leaf was measured. Happens occasionally (3.6% of all lvs in study)when the sterile leaf happens to be longer, or all fertile leaves were broken. In early years (prior to 2007) the leaf type was not noted.textSsterile leafFfertile leafTYPE_PLANTTYPE_PLANTIn the monitoring year, the plant has produced one or more fertile (spore-bearing) leaves or is sterile, having produced only photosynthetic leavestextFfertile plantSsterile plantVCROWNVCROWNCode used in later years to describe plants with 4 or more leaves for which the leaves formed a complete circle, suggesting that all croziers had successfully emerged and matured; these plants were therefore capable of maximum leaf litter accumulationtextVfully vase-shapedWIDWIDWidth of lamina at about midpoint for the longest leaf on plantintmeterinteger141YEARYEARYear during which fall monitoring took placedateYYYY