ID

Plant identification number

Block

Block number (there is a total of 6 blocks)

SPECIES

Thistle species: TT = tall thistle ; BT = bull thistle

COMP

Competition level: COMP=high (ambient, control, 65 - 90% cover); COMP=medium (reduced to 25 - 35% cover); and COMP=low (reduced to 0 - 5% cover).

HERB

Levels of herbivore pressure: HERB= Ambient (no manipulation), HERB = Reduced (insecticide application)

species

Thistle species: 1 = tall thistle (only one species in this data set)

comp

Competition level: Comp = 2(ambient, control, 65 - 90% cover); Comp = 1 (reduced to 25 - 35% cover); and Comp = 0 (reduced to 0 - 5% cover). 

herb

Levels of herbivore pressure: Herb = 1 (ambient), Herb = 0 (insecticide application)

Total.emerged.07.08

Number of seedlings emerges (out of 400 seeds)

year

Calendar year of sampling

id

Plant identification number

site

comp

Competition level: Comp = 2(ambient, control, 65 - 90% cover); Comp = 1 (reduced to 25 - 35% cover); and Comp = 0 (reduced to 0 - 5% cover). 

herb

Levels of herbivore pressure: Herb = 1 (ambient), Herb = 0 (insecticide application)

initialrosettediam

Initial rosette diameter in cm

sqrt.initialrosettediam

Square root transformed initial rosette diameter in cm

seedproducedyesno

Seed production 0( = No, 1 = Yes)

flowerhds

Total number of mature flower heads per plant

lnflowerhds

Natural Log of total number of flower heads per plant

noseeds

Total Number of seeds per plant

lnnoseeds

Natural Log of Total Number of seeds

leavesAUG

Total Number of leaves in August

biomass

Total aboveground biomass in g

ID

Plant identification number

block

Block number (there is a total of 6 blocks)

plot

Plot number

reps

Replication number

Species

Thistle species: TT = tall thistle ; BT = bull thistle

Comp

Competition level: Comp = high (ambient, control, 65 - 90% cover); Comp = medium (reduced to 25 - 35% cover); and Comp=low (reduced to 0 - 5% cover).

Herb

Levels of herbivore pressure: Herb= Ambient (no manipulation), Herb = Reduced (insecticide application)

species

Thistle species: 1 = tall thistle (only one species in this data set)

comp

Competition level: Comp = 2(ambient, control, 65 - 90% cover); Comp = 1 (reduced to 25 - 35% cover); and Comp = 0 (reduced to 0 - 5% cover).

herb

Levels of herbivore pressure: Herb = 1 (ambient, control), Herb = 0 (insecticide application)

no.leaves07

Number of leaves in July 2007

ave.diam07

Average rosette diameter in July 2007 in cm (two measurements, perpendicular to each other)

mid.leaf.length07

Length of an average (medium) leaf

meristem.da07

Presence of meristem damage in July 2007  (0 = No, 1 = Yes)

ttl.leaf.da.score07

Total leaf damage score in July 2007  (1 = 0.1-6.2%, 2 = 6.3-12.4%, 3 = 12.5 - 24.9%, 4 = 25-49.9%, 5 > 50%)

ave.da.per.leaf07

Average leaf damage score per leaf ( total leaf damage score / total leaf numbers) in July 2007

survived08

Plant survival in July 2008 ( 0 = dead, 1 = alive)

bolt08

Presence of bolt in July 2008 ( 0 = not bolted, 1 = bolted)

no.leaves08

Total Number of leaves in July 2008

no.buds08

Number of buds in July 2008

biomass.buds08

Total bud biomass in July 2008 (g)

biomass.leaves08

Total leaf biomass in July 2008 (g)

veg.bio

Vegetative biomass in g (stem biomass +leaf biomass)

comments

Comments

total biomass 08

Total aboveground biomass in g (in 2008 (stem biomass +leaf biomass +bud biomass)

Plant ID

Plant Identification number

Topo

Topographical location of the plot

year

Calendar year of sampling

site

Data were collected at different sites in Nebraska: 9mile = Nine Mile Prairie, divoky = , DivokyAcres = JackSinn, Nine-mile  , TripleCreek = , trplcrk = , TwinLakes

Species

Thistle species: TT = tall thistle (only one species in this data set)

Comp

Competition level: Comp=high (only one competition level in this data set). Plant cover was not manipulated, which is comparable to the cover in the bull thistle experiments. 

Herb

Levels of herbivore pressure: Herb= Ambient (no manipulation), Herb = Reduced (insecticide application)

species

Thistle species: 1 = tall thistle (only one species in this data set)

comp

Competition level: comp = 2 (only one competition level in this data set). Plant cover was not manipulated, which is comparable to the cover in the bull thistle experiments. 

herb

Levels of herbivore pressure: Herb = 1 (no manipulation), Herb = 2 (insecticide application)

Rsst Diam Ext

rosette diameter

No Lvs

Number of leaves

no.buds

the mean number of seeds (whether damaged or not, developed or not) produced per flower head that flowered and was dissected

hdsflrd

the total number of flower heads produced by the plant

viable seeds

Y=yes, the plant produced viable seeds, N= no, the plant did not produce any viable seeds

mean developed, undamaged seeds per head

the mean number of developed, undamaged seeds produced per flower head that flowered and was dissected

total.seeds

the total number of seeds produced per plant (=hdsflrd* mean developed, undamaged seeds per head)

mean total seeds per hd

The mean total number of seeds (whether damaged or not, developed or not) produced per flower head that flowered and was dissected.

Date 2

Date on which the earliest flower head to disperse seeds was collected for dissection.  Seeds were captured by enclosing post-anthesis flower heads in mesh bags.  Also, the date on which year-end measurements, such as ‘hdsflrd,’ were made.

comments

Comments