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Title:
Main Experiment: Trap nest data Site B 2014/15
Access rights:
Private
Usage rights:
No information available
Published:
No information available
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.
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
Measurement cirumstances:
No information available
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.

Filter:
Dataset column

Name:
Plot
Definition:
Plot within the Experimental Site B
Unit:
No information available
Datagroup:
BEF research plot name
Keywords:
location, main
Values:
C32
E29
B35
D29
E25
Contributors:
No information available

Dataset column

Name:
TrapID
Definition:
Location of the trap nest
Unit:
No information available
Datagroup:
Helper
Keywords:
location
Values:
bar_I
bar _II
bar_III
bar_II
bar _IIII
Contributors:
No information available

Dataset column

Name:
Host_species
Definition:
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.
Unit:
No information available
Datagroup:
Bee/wasp species name
Keywords:
species, taxon, host
Values:
Ancistrocerus SP1
Anterhynchium flavomarginatum curvimaculatum
Chalybion japonicum
Allorhynchium chinense
Auplopus carbonarius
Contributors:
No information available

Dataset column

Name:
No_broodcells
Definition:
Number of brood cells established by the host species in one sample (Reed internode).
Unit:
count
Datagroup:
Abundance
Keywords:
abundance
Values:
1
11
0
12
10
Contributors:
No information available

Dataset column

Name:
Higher_species_1
Definition:
Name of Higher species 1, that attacked the host species
Unit:
No information available
Datagroup:
Bee/wasp/beetle/fly species name
Keywords:
species, taxon, parasitoid, enemy
Values:
Braconidae SP1
Braconidae SP2
Amobia SP1
Anthrax aygula
Aphanteles SP1
Contributors:
No information available

Dataset column

Name:
No_attacked_broodcells_sp1
Definition:
Number of brood cells attacked by Higher specis 1
Unit:
count
Datagroup:
Abundance
Keywords:
abundance
Values:
1
2
0
3
15
Contributors:
No information available

Dataset column

Name:
Higher_species_2
Definition:
Name of Higher species 2, that attacked the host species
Unit:
No information available
Datagroup:
Bee/wasp/beetle/fly species name
Keywords:
species, taxon, parasitoid, enemy
Values:
Aphanteles SP1
Amobia SP1
Braconidae SP1
Chrysis smaragdula
Anthrax aygula
Contributors:
No information available

Dataset column

Name:
No_attacked_broodcells_sp2
Definition:
Number of brood cells attacked by Higher specis 2
Unit:
count
Datagroup:
Abundance
Keywords:
abundance
Values:
0
10
1
3
2
Contributors:
No information available

Dataset column

Name:
Sampling_date
Definition:
Day of nest collection
Unit:
No information available
Datagroup:
Date time information
Keywords:
date
Values:
2014-09-09
2014-10-10
2014-09-07
2014-09-08
2014-10-09
Contributors:
No information available

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Felix
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