Transcript Does habitat destruction always lead to loss in biodiversity?

Does habitat destruction always
lead to loss in biodiversity?
Kim van der Linde
Animal Ecology
Institute of Evolutionary and Ecological Sciences
Leiden University
Applied biodiversity research
Limited time for research
But:
We want to know everything
So:
What about an indicator group?
Aim of the Study
• Are Drosophila’s potentially useful as
indicator group?
• Therefor, we need to know first:
• Do they show a clear relation between
biodiversity and disturbance?
Methods
• 10 different habitats
• 2 collection sites per
habitat
• oviposition traps
• adult and offspring
Habitats
1. Closed canopy forest (picture)
2. Open canopy forest
3. Patches of logged over forest
4. Scrub, forest with all trees removed
5. Pioneer vegetation on recovering kaïngins
6. Kaïngins, slash and burn agriculture
7. Semi, kaïngins with a semi-permanent character
8. Banana plantation
9. Reforestation with (mostly) softwood species
10.Grassland (picture)
Indices and ranking
S alpha H HB DMG McU 1/D d McD HE EHB McE ES DMN N
*
First Adult
Second Adult
First Offspring
**
Second Offspring
*
Binomial test
P=0.000418
* *
*
*
1. S
2. alpha
3. H
4. HB
5. DMG
6. McU
7. 1/D
8. d
9. McD
10. HE
11. EHB
12. McE
13. ES
14. DMN
15. N
*
*
Number of species
The alpha (α) of the log series model
Shannon diversity index for species richness
Brillouin index for species richness
Margalef's diversity index
McIntosh's index of species diversity
Simpson's index
Berger-Parker diversity index
McIntosh's index of dominance
Shannon diversity index for evenness
Brillouin index for evenness
McIntosh's index of evenness
Rarefraction
Menhinick's index
Number of individuals
Overlap between habitats
100
Percentage overlap (%)
90
80
70
60
50
40
30
20
10
0
0
1
2
3
4
5
6
7
8
9
Distance in disturbance ranking (highest rank - lowest rank)
Mann-Whitnney U-test, one tail probability adult1: p=0.042; adult2:
p=0.184; offspring1: p=0.034; offspring2: p=0.005
10
Does habitat destruction always lead to loss in biodiversity?
• No change in biodiversity indices
• But large change in overlap percentages
• Potentially useful as indicator group