Lab 6 - Techniques in Ecology C - Invertebrates

Question 1

What are some important ecosystem functions of invertebrates?

Answer 1

• Dung burial
• Decomposition of plant material (nutrient recycling)
• Pest control
• Pollination
• Soil aeration and turning
• Wildlife nutrition (food source)
• Seed dispersal

Question 2

How would you distinguish an arachnid from an insect?

Answer 2

Insects have six legs, whereas arachnids have eight. Most insects have antennae, but arachnids don’t.
Insects have 3 body segments (head, abdomen, thorax); arachnids only have 2 (abdomen,
cephalothorax).

Question 3

Describe the main morphological and ecological (food preference, habitat) differences between
centipedes and millipedes?

Answer 3

Morphological: Millipedes have two sets of leg per segment under their body while centipedes have only one. Millipedes have a tube shaped body and small antennae while centipedes have long antennae and a flat body.
Ecological: Millipedes can be found in moist forest areas while centipedes prefer dry environments. Millipedes eat decomposing organic matter while centipedes eat insects and small animals.

Question 4

What kinds of invertebrates do you expect to be caught with the pit-fall trap?

Answer 4

Mostly invertebrates that dwell in the ground such as some beetles, ants, spiders, and millipedes.