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The indicative value of specific insect groups
Transcript of The indicative value of specific insect groups
for the whole taxonomic level of insects, when decline is concerned.
An internship at CML
year 2014-2015, second semester
Supervisor: C.J.L. Musters
by Hans Peter Honkoop
- Material and Method
- Discussion and conclusion.
- Suggestions for further research.
Decision making and policy
Urgent need for a way to generalize the effect of a conservation measure on the decline of one (indicator) group to a bigger taxonomic group.
Musters et al. 2013: Random forest method.
Birds to vertebrates 75.43%
(Expected: 56.27% )
Vertebrates to animals: 72.9 % (Expected: 64.79%)
Vascular plants to plants: 79.73%
Butterflies to insects: 57.1 %
Musters et al (2013) database:
R forest method (R. 3.0.2), creation of indicator forest.
Dutch red list data
Musters et al. (2013) : Database of traits and species.
Classification by random forest.
Dutch red list data insects
Actual correct classification
Butterflies are bad indicators:
- Hambler C., 2004: Terrestrial, herbivorous, thermophilous insects and very sensitive to climatic fluctuations.
- Hambler C., 2004: Sampling bias in well known species.
- Musters et al, 2013: Only three traits in common with insects.
Expectation: same value as indicator species.
Indicative value indicator random forest.
What is the indicative value of insect groups other than butterflies for insects, when decline is concerned?
- Bees and Caddisflies are suitable indicators for all insects combined.
- When the insect groups are divided into aquatic and terrestrial groups, all indicative values improve. Bees and grasshoppers then prove to be suitable indicators for terrestrial groups and mayflies and Caddisflies prove to be suitable indicators for aquatic insects.
Thank you for your attention
- Certain insect species have certain traits in common.
- Policy aimed at one species or species group could be beneficial for other species as well, because of these common traits.
- If this is true, decline in a species or species group would indicate decline in species or species group with traits in common.
Main discussion points:
- Large Type 1 and type 2 errors.
- Number of common traits.
- Dispersion data.
- Sampling bias in bees, butterflies and dragonflies.
A - E
Suggestions for further research:
- Trait importance
- Dataset size
- Insect group splitting
- Groups other than insects
- Focus terrestrial insect monitoring/policy on bees and grasshoppers.
- Focus aquatic insect monitoring/policy on mayflies and caddisflies.