Title: WHY ARE INSECTS SO SUCCESSFUL
1WHY ARE INSECTSSO SUCCESSFUL?
2HEXAPODDIVERSITY
1. PARAINSECTS 2. DIPLURANS 3. INSECTS
3INSECTS
ARCHAEOGNATHA (JUMPING BRISTLETAILS) THYSANURA
(SILVERFISH FIREBRATS) EPHEMEROPTERA
(MAYFLIES) ODONATA (DRAGONFLIES AND
DAMSELFLIES) NEOPTERA (MOST INSECTS 26 ORDERS)
4ORDER ODONATA (DRAGONFLIES)
Aquatic nymph with mask Adult with 2 pairs of
wings 2 Groups Damselflies Dragonflies
5DEFINED BY ADULT WINGS
Zygoptera Anisoptera Damselfly
Dragonfly
6ADULT RESTING
Damselfly Dragonfly
7NYMPH
Damselfly Dragonfly
8NYMPH HAS MASK
9APTERYGOTES
1. PARAINSECTS 2. DIPLURANS 3. INSECTS
ARCHAEOGNATHA
THYSANURA
EPHEMEROPTERA
ODONATA
NEOPTERA most insects
10PTERYGOTES
1. PARAINSECTS 2. DIPLURANS 3. INSECTS
ARCHAEOGNATHA
THYSANURA
EPHEMEROPTERA
ODONATA
NEOPTERA most insects
11NEOPTERA
1) EXOPTERYGOTES 15 ORDERS
Incomplete Metamorphosis Have Nymphs Largest
order Hemiptera (Bugs)
12EXOPTERYGOTES Incomplete Metamorphosis Have
Nymphs
nymphs
egg
BUG
adult
13HEXAPODS OUTSIDE NEOPTERA Incomplete
Metamorphosis
nymphs
eggs
adult
14NEOPTERA
1) EXOPTERYGOTES 15 ORDERS 2)
ENDOPTERYGOTES 11 ORDERS Include the
big three orders Lepidoptera Hymenoptera
Coleoptera Moths Bees, etc.
Beetles
15ENDOPTERYGOTES COMPLETE METAMORPHOSIS HAVE
LARVAE PUPA
larvae
eggs
MOTH
pupa
adult
16WHY ARE INSECTS SO SPECIES-RICH?
17FIVE OUT OF MANY ANSWERS
18INSECTS ARE SUCCESSFULBECAUSE
(1) THEY ARE SMALL High surface area volume
ratio Experience world as fine-grained
19HIGH SURFACE AREA VOLUME RATIO
- Can jump from heights that would kill (e.g.)
mammals
20HIGH SURFACE AREA VOLUME RATIO
- Can jump from heights that would kill mammals
- Can can jump to heights many times their body
length
21HIGH SURFACE AREA VOLUME RATIO
- Can jump from heights that would kill mammals
- Can can jump to heights many times their body
length - Can carry many times their body weight
22HIGH SURFACE AREA VOLUME RATIO
- DRAWBACKS
- Rapid heat exchange
23HIGH SURFACE AREA VOLUME RATIO
- DRAWBACKS
- Rapid heat exchange
- Potentially devastating water loss in dry
habitats
24EXPERIENCE WORLDAS FINE-GRAINED
25SMALL SIZE
ONE PROBLEM VULNERABLE TO WIDER RANGEOF
MORTALITY FACTORS e.g. more predators than larger
species
26SMALL SIZE
CENTRAL PROBLEM INSECTS ARE NOT UNUSUALLYSMALL
27INSECTS ARE SUCCESSFULBECAUSE
(2) HAVE PROTECTIVE CUTICLE
28INSECTS ARE SUCCESSFULBECAUSE
(3) HAVE BLOOD-BRAIN BARRIER
29INSECTS ARE SUCCESSFULBECAUSE
(4) CAN FLY
30INSECTS ARE SUCCESSFULBECAUSE
(4) CAN FLY
STRIKING THAT ONLY PTERYGOTES - MOST CAN FLY
ARE SPECIES-RICH
31FLIGHT
CANNOT BE SOLE REASON BIRDS BATS ARE NOT AS
SPECIES-RICH
32INSECTS ARE SUCCESSFULBECAUSE
(5) REPRODUCE FAST
33INSECTS ARE SUCCESSFULBECAUSE
(5) REPRODUCE FAST Many rear 50 young per
month
34INSECTS ARE SUCCESSFULBECAUSE
(5) REPRODUCE FAST Many rear 50 young per
month After 18 months their descendents
2.9 x 1025
35HIGH REPRODUCTIVE RATE
CENTRAL PROBLEM EXPECTED OF r-SELECTED SPECIES
36WHY ARE INSECTS SO SUCCESSFUL?
A COMBINATION OF FACTORS?
37WHY ARE INSECTS SO SUCCESSFUL?
WRONG QUESTION?
38WHY ARE ENDOPTERYGOTESSO SPECIES-RICH?
39IS PUPATION A KEY INVENTION?
40 Allows larvae adults to completely avoid
competition Species can occupy two niches
41WHY ARE 3 ORDERSSO SPECIES-RICH?
42Beetles (Coleoptera) All over armour?
43Beetles (Coleoptera) All over armour? Moths
(Lepidoptera) Caterpillar herbivory?
44Beetles (Coleoptera) All over armour? Moths
(Lepidoptera) Caterpillar herbivory? Adult
nectarivory?
45Beetles (Coleoptera) All over armour? Moths
(Lepidoptera) Caterpillar herbivory? Adult
nectarivory? Bees etc. (Hymenoptera) Nectarivory?
46Beetles (Coleoptera) All over armour? Moths
(Lepidoptera) Caterpillar herbivory? Adult
nectarivory? Bees etc. (Hymenoptera) Nectarivory?
Sawfly larva herbivory?
47Beetles (Coleoptera) All over armour? Moths
(Lepidoptera) Caterpillar herbivory? Adult
nectarivory? Bees etc. (Hymenoptera) Nectarivory?
Sawfly larva herbivory? Parasitoids?
48ABOUT 10 OF ANIMALS ARE PARASITOID WASPS
49PARASITOID WASP
.
ovipositor
wasp egg or larva
50HYPER-PARASITOID WASP
.
.
51SUPER-PARASITOID WASP
.
.
.
.