Earthworm data of the exploratory region in Germany (April 2012)

Usage Rights

This data is Free within projects.

Dataset Abstract

The belowground foodweb holds a big part of the associated biodiversity in forest ecosystems and plays a major role in litter decomposition and nutrient turnover. So far important interactions between diversity and composition of above- and belowground foodwebs have been observed, however, without being conclusive on the effects of tree species diversity on the belowground foodweb. The response of earthworms as important functional group in the soil ecosystem is assessed. The earthworm sampling records the abundance, biomass and species diversity of earthworms in each focal region. All (30 x 30) m2 plots are divided in nine (10 x 10) m2 subplots. In every plot, earthworms were sampled in the middle subplot. First (if present), a central litter sample (25x25cm) is taken followed by the 'mustard extraction method' over an area of 0,5 m² (0.5x1m) and a final soil sample (25x25x20cm) (length, width, depth) in the middle of this location. Litter and soil samples were taken to the lab for further handsorting, whereby the pit left after sampling was levelled off with surrounding soil. Sampled earthworms are stored in 70% ethanol solution.

Dataset Design

For every plot of the focal region, plots (30 x 30) m2 are divided in nine (10 x 10) m2 subplots. In every plot, earthworms were sampled in the middle subplot. In principle, within every middle subplot, the samples are taken randomly, but samples are not taken close to tree stems. First (if present), a central litter sample (25x25cm) is taken followed by the 'mustard extraction method' over an area of 0,5 m² (0.5x1m) and a final soil sample (25x25x20cm) (length, width, depth) in the middle of this location. When no litter is present, no litter sample could be taken and only a mustard extraction and soil sample is carried out. Litter and soil samples were taken to the lab for further handsorting, whereby the pit left after sampling was levelled off with surrounding soil. Sampled earthworms are stored in 70% ethanol solution.

Spatial Extent

Hainich National Park, Germany

Temporal Extent

Spring 2012

Taxonomic Extent

Earthworms

Data Analysis

Variables of interest are: Species, Biomass (g), Number (m²), Biomass (g/m²). Number (m²) and Biomass (g/m²) are scaled up numbers of the original caught individual and biomass in a particular sampling method. Attention! Corrections for slope of the sampled area however are not included.

Data columns available in the raw data part of this dataset

Date
Data of sampling
Data group: Sampling Date
Values
2012-04-17
2012-04-16
2012-04-18
2012-04-19
2012-04-20
Time
Time of sampling
Data group: Survey time
Values
1899-12-30 09:07:00
1899-12-30 09:18:00
1899-12-30 09:14:00
1899-12-30 09:13:00
1899-12-30 09:06:00
PlotID
Unique plot id
Data group: Exploratory plot id
Values
GER05
GER03
GER04
GER01
GER02
Name samplers
Name of sampler
Data group: Helper
Values
Felix Berthold
Jorgen Opdebeeck
Sampling method
Method of sampling: L=Litter sample; M=Mustard extraction; S=Soil sample
Data group: Sampling method
Values
S
M
L
Slope Length
Lengthwise slope of the sampled area. Value 0 if slope <5°
Unit: degrees
Data group: Topography
Values
24
0
16
5
10
Slope Width
Width-wise slope of the sampled area. Value 0 if slope <5°
Unit: degrees
Data group: Topography
Values
11
6
9
0
Sample code
Sample point code (year/sampling responsible/country/chronological number of sampling action)
Data group: Sample code
Values
12HWDE004
12HWDE001
12HWDE003
12HWDE002
12HWDE005
Date on formol
Date on which the earthworm fixation in a 5% formaldehyde solution started
Data group: Fixation moment
Values
2012-05-03
NA
Date back on ethanol
Date on which the earthworm is transferred from formaldehyde solution to 70% ethanol solution
Data group: Preservation moment
Values
NA
2012-08-17
Date identification
Data of earthworm identification
Data group: Identification moment
Values
2012-09-19
2012-09-24
2012-09-18
2012-09-20
2012-09-21
Name observer - identifier
Name of person who identified and weighed the earthworm
Data group: Helper
Values
Sam Ottoy
NA
* These persons could not be matched within the portal: Sam Ottoy also contributed to this column.
Species
Earthworm species name, identified with the key of Sims and Gerard 1999
Data group: Earthworm species
Values
Dendrobaena octaedra
Aporrectodea caliginosa
Dendrobaena pygmea
Aporrectodea rosea
Aporrectodea sp.
Development stage
Developmental stage of the earthworm: A= adult; S= subadult; J= juvenile ; / = development stage not determinable (Adult = clitellum, tubercula pubertatis and male pore developped; Subadult= clitellum, tubercula pubertatis and male pore not fully developped; Juvenile= no clitellum, tubercula pubertatis and male pore present)
Data group: Earthworm descriptor
Values
A
/
NA
S
J
Biomass
weight of the individual earthworm. 0 means no worm in sample
Unit: gram
Data group: Earthworm biomass
Values
0.005
0
0.004
0.002
0.003
* Berthold, F., These persons could not be matched within the portal: Jorgen Opdebeeck also contributed to this column.
Body part
Description of which part of the organism is sampled: Complete = entire organism; Head = only the rostral part; Tail = only the caudal part; Middle piece = only a middle part
Data group: Earthworm descriptor
Values
NA
Head
Middle piece
Complete
Tail
Density
Number of earthworm individuals scaled up to m², without additional correction for slope of the sampled area; 0 means no worms in sample
Unit: number
Data group: Earthworm density
Values
2
0
16
Biomass per square meter
Weight of the earthworm scaled up to 1m², without additional correction for slope of the sampled area; 0 means no worms in sample
Unit: gramsPerSquareMeter
Data group: Earthworm biomass
Values
0
0.008
0.01
0.012
0.006