Main Experiment: Trap nest data Site B 2014/15

Usage Rights

This data is Private.

Dataset Abstract

Trap nests are a well-established tool to monitor cavity-nesting Hymenoptera and to assess parasitism rates. Despite only 5-10% of all non-parasitoid solitary bee and wasp species are colonizing trap nests, it has been show that the cavity-nesting part of the Hymenoptera community is representative for the overall Hymenoptera community in terms of species richness and abundance.
In the BEF-China project, we used standardized trap-nests in 40 plots in Site A and 48 plots in Site B. We included all VIPs and additional plots to balance sampling to at least 8 replicates per species richness level (except for 24 species), on Site A eight monocultures were dropped due to logistical limitations. Per plot, two wooden posts with two trap nests (Site B four trap nests), each consisting of a 22 cm long, 12.5 cm diameter plastic tube filled with dried Arundo donax L. (Poaceae) internodes of varying diameter (2-20 mm) were exposed.
Trap nests were set up approximately 1.5 m above the ground and controlled monthly for nests that are easily distinguishable by the characteristic nest sealing pluck. Internodes containing nests were replaced with new internodes of the same diameter. Nests were taken to the laboratory, opened and reared in glass test tubes closed with cotton wool till hatching.
We found a diverse set of bee, wasp, and parasitoid (and other enemy) species. Individual species differ markedly in their nesting and feeding ecology.

Dataset Design

Trap nests (eight traps per plot; four traps each attached to a wooden post; located at two diagonal corners of the core area, close to xxyy: 0707 and 1212) were used to collect solitary bees and wasps in the Main experiment. Abundance and species richness of bees and wasps allow to test to which extent woody plant species richness affects the abundance, species composition and diversity of, e.g. predators (which might profit from higher structural diversity or better resource availability in more plant diverse plots) or pollinators (which might profit from more diverse flower resources). Traps consisted of plastic tubes (diameter 12.5 cm, length 22 cm) that were filled with dried internodes of the reed Arundo donax L. (2-20 mm diameter). Trap nests were exposed from August 2014 to August 2015. All trap nests were checked monthly for nests of solitary bees and wasps. These were then reared in the laboratory till hatching. Taxa were first sorted to morphspecies and then identified to species level with the help of taxonomic experts whenever possible.

Spatial Extent

Main experiment Site A, all VIPs and additional plots to balance sampling to at least 8 replicates per species richness level (except for 24 species)

Temporal Extent

September 2014 - July 2015

Taxonomic Extent

Solitary cavity-nesting Hymenoptera

Data Analysis

The data allow to test to what extent woody plant species richness affects the abundance, species composition and diversity of, e.g. predators (which might profit from higher structural diversity or better resource availability in more plant diverse plots) or pollinators (which might profit from more diverse flower resources). Individual numbers presented are brood cell numbers, i.e. the number of brood cells provisioned by within one reed internode, which can be multiple internodes for the same species within one trap. The identity and number of higher species 1 and 2 are given for each nest. If not empty then the host species was attacked by the higher species with a complete loss of the offspring in the attacked brood cell. Therefore, to calculate the number of host species hatched from the internode, the sum of the higher species needs to be subtracted from the number of brood cells of the host species. Hosts and higher species are provided to construct interaction networks and calculate parasitism rates, which we test in response to plant species richness, succession and host occurrence.

Data columns available in the raw data part of this dataset

Plot
Plot within the Experimental Site B
Data group: BEF research plot name
Keywords: location, main
Values
B35
C32
E29
D29
E25
TrapID
Location of the trap nest
Data group: Helper
Keywords: location
Values
bar _IIII
bar _II
bar_I
bar_III
bar_II
Host_species
Name of bee/wasp species that established the nest; Datagroup description: Nominal taxon which has been assigned to a species(group). This does not reflect a real taxonomic instance but allows to differentiate certain taxonomic and/or functional instances across analyses that do not rely on detailed taxonomy.
Data group: Bee/wasp species name
Keywords: species, taxon, host
Values
Allorhynchium chinense
Auplopus carbonarius
Ancistrocerus SP1
Chalybion japonicum
Anterhynchium flavomarginatum curvimaculatum
No_broodcells
Number of brood cells established by the host species in one sample (Reed internode).
Unit: count
Data group: Abundance
Keywords: abundance
Values
12
10
0
1
11
Higher_species_1
Name of Higher species 1, that attacked the host species
Data group: Bee/wasp/beetle/fly species name
Keywords: species, taxon, parasitoid, enemy
Values
Aphanteles SP1
Braconidae SP1
Anthrax aygula
Braconidae SP2
Amobia SP1
No_attacked_broodcells_sp1
Number of brood cells attacked by Higher specis 1
Unit: count
Data group: Abundance
Keywords: abundance
Values
15
2
0
1
3
Higher_species_2
Name of Higher species 2, that attacked the host species
Data group: Bee/wasp/beetle/fly species name
Keywords: species, taxon, parasitoid, enemy
Values
Braconidae SP1
Chrysis smaragdula
Anthrax aygula
Amobia SP1
Aphanteles SP1
No_attacked_broodcells_sp2
Number of brood cells attacked by Higher specis 2
Unit: count
Data group: Abundance
Keywords: abundance
Values
10
3
1
0
2
Sampling_date
Day of nest collection
Data group: Date time information
Keywords: date
Values
2014-09-07
2014-10-09
2014-09-08
2014-10-10
2014-09-09