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Wood for bees, which interactions?Anna Dupleix
To cite this version:
Anna Dupleix. Wood for bees, which interactions?. Master. Iran. 2018. �cel-02010186�
Wood for bees, which interactions?
The University of Tehran, Dept Wood Sciences, University College of Agriculture and Natural Ressources 01/10/2018
Anna Dupleix Post-doctoral researcher
__________________________________________________ Montpellier, France
__________________________________________________
Wood sciences
Anthropology
Apidology
Contents
The researcher
The laboratory The project The history
Physical approach Chemical and ecological approach Social sciences approach
Latest developments Future work
2
Researcher background
3
International co-tutelle agreement between Arts et Métiers ParisTech LaBoMaP, Cluny, France and Aalto University, Helsinki, Finland Topic : Feasibility of wood peeling assisted by infrared
Engineer
Master degree in Wood Technology Master of research in Timber design Topic : Investigation on failure modes of multiple-nailed steel-to-timber connections loaded parallel to the grain
PhD degree in Wood mechanics
Master thesis : Investigating failure modes of multiple-nailed steel-to-timber connections loaded parallel to the grain Case study : Radiata Pine (Pinus Radiata)
4
Cred
its
: Ann
a Du
plei
x
brittle failure
ductile failure
Appl
ied
load
Displacement
Fig.2. Load vs displacement curves in case of ductile and brittle failures
0
50
100
150
200
250
0 2 4 6
Load
(kN
)
Displacement (mm)
Specimen 410red-1
BottomTop
Fig.3. Typical load-displacement curve of a tested specimen
Fig.1. Test set-up
PhD thesis : Feasibility of wood peeling assisted by infrared radiation
5
Cred
its
: Ann
a Du
plei
x
Peeling process: veneer production
PhD thesis : Wood kebab
6
Cred
its
: Ann
a Du
plei
x
Wood is not penetrated deep and fast enough by the IR radiation
Laboratory
7
Wood sciences
Anthropology
Apidology Montpellier, France
Biomechanics and wood formation
Wood building
Diversity of wood properties
Uses of wood in traditional knowledge
Project : Wood for bees, which interactions?
8 Source : omafra.gov.on.ca Source : pinterest.fr
Source : omafra.gov.on.ca Source : pinterest.fr
Honeybees have to face major problems nowadays
(pesticides, Varroa destructor, climate change, etc.)
Their lives are at stake and therefore humanity because
of their role in pollination
Our hypothesis is that the wood material of the hives can help them thanks to many interactions.
Source : CNRS
History of the project
9
Traditional uses of beehives
- In Cévennes (South of France) : chestnut trunk
- In Finland : polystyren
Hypothesis of the project and methods of work
10
Scientific hypothesis from local traditional knowledge 1) « Chestnut trunk beehives can lower temperature and humidity differences thanks to thickness of wood »
2) « Polystyrene beehive is more insulative from a thermal point of view »
3) « Chestnut extractives promote bees health »
4) « Chestnut wood is repellent to Varroa destructor »
Tests on the thickness and material of beehive on (T°C, RH%) inner climate
Tests on the effect of chestnut extractives on Varroa destructor and bees health
Physical approach
11
Comparison of different thicknesses and wood species on inner (T°C, RH%) climate
Material Thicknesses (mm)
Open/Closed
Chestnut 15, 21, 30 21
closed open
Cryptomeria 21 closed
Spruce 21 21
closed open
Polystyrene 21 21
closed open
Sour
ce :
Ann
a Du
plei
x
Fig. 1: Empty hives equipped with (T°C, RH%) sensors
First results
12
Relative Humidity (%) in blue and Temperature (°C) in red
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cryptomeria closed 21mm
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polystyrene closed 21mm
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chestnut closed 30mm
Chemical and ecological approach
13
Comparison of effects on chestnut vs spruce extractives on Varroa destructor
Fig. 1: Chestnut extractives extraction (in gaz and in liquid forms)
Fig. 2: Electrodes for testing olfactive sensors (located in the front leg) of Varroa 2mm
Sour
ces
: H
arri
ngto
n
Social sciences
14
Face to face interviews with beekeepers and beehive builders on their knowledge and perception of the wood material for the bees
Beekeepers and beehive builders have strong knowledge on the wood material (species, properties)
They know how to use it
Some of them think it has an influence on the bees health (depending on their kind of beekeeping)
Development of Varroa counting
7
Contexte
Today Tomorrow
Time-consuming
Smartphone Application
From manual to automated counting
8 Algorithms based on deep-learning
First results of counting
17
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70.00
31/12/2017 19/02/2018 10/04/2018 30/05/2018 19/07/2018 07/09/2018 27/10/2018
Chestnut Varroa count/Day/Colony Population =f(t)
RUCHE 2 (Châtaignier) RUCHE 4 (Châtaignier) RUCHE 6 (Châtaignier) RUCHE 8 (Châtaignier)
RUCHE 10 (Châtaignier) RUCHE 12 (Châtaignier) RUCHE 14 (Châtaignier) RUCHE 16 (Châtaignier)
Future work
18
Study (T°C, RH%) inside living beehives (with bees)
Comparison of effects on chestnut vs spruce extractives on bees health
Continue this work on bee hives in living trees Bashkyrie/Poland
Cévennes, France
Thank you for your attention
and
Welcome to work together in France and Iran
19
