Lecture 11: Why are arthropods successful?
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1 Lecture 11: Why are arthropods successful?
2 Goals: 1. Define success 2. Compare insects to other living organisms, understand what insect adaptations have contributed to their success 3. Relate methods of attaining success to the human race Assignment: Read: Chapter 22 or 23 or 11 depending on the book Websites:
3 Biological Classification Kingdom, Phylum, Class, Order, Family, Genus, Species Binomial Nomenclature Leptinotarsa decemlineata Look this up for Humans and know it!
4 Phylum Arthropoda 1. Exoskeleton 2. Segmented body 3. Jointed appendages 4. Double ventral nerve cord 5. Open circulatory system 6. Bilateral symmetry 7. Sexual Reproduction
5 Classes of Arthropoda Class Common Name Merostomata Merostomata Horseshoe Horseshoe Crab Crab (5) (5) Pycnogonida Pycnogonida Sea Sea Spider Spider (500) (500) Pauropoda Pauropoda Environment Aquatic Aquatic Size 3-60mm 3-60mm Aquatic Aquatic Marine Marine cm -70cm None None (380) (380) Soil Soil and and Leaf Leaf Mold Mold 5-20mm 5-20mm Symphyla Symphyla None None (120) (120) Soil Soil and and Leaf Leaf Mold Mold 2-10mm 2-10mm Crustacea Crustacea Sow Sow Bug, Bug, Lobster Lobster (26,000) (26,000) Diplopoda Diplopoda Millipede Millipede (8000) (8000) Terrestrial Terrestrial.1-100cm.1-100cm Chilopoda Chilopoda Centipede Centipede (3,000) (3,000) Terrestrial Terrestrial.1-100cm.1-100cm Insecta Insecta Insects Insects (1,000,000) (1,000,000) Aquatic, Aquatic, Land Land Aquatic, Aquatic, Land, Land, Air Air.2mm-200cm.2mm-200cm.1mm-25cm.1mm-25cm
6 1. Three Body Regions 2. Three pairs of legs 6. Unique biology Class Insecta 3. Most groups have functional wings 4. One pair of antennae 5. Tracheae respiratory system
7 Criteria for measuring success 1. Historically successful 2. Current diversity 3. Environmental impact
8 Historically Successful 1. Trilobites 600x10 6 ago, fossils = hard exoskeleton
9 Historically Successful 2. Dinosaurs 230x1066 ago, first terrestrial egg Died out 65 x 1066 years ago
10 Historically Successful 3. Brachiopods - hard shells, diverse forms, Been around 545 x 10 6 years
11 3. Insects - Historically Successful Oldest fossils 400 x 10 6 years old These fossils are already well developed Hard to find good insect fossils
12 Current Diversity Current Diversity Tale of the Tape Only 4,000! insects plants non-insect arthropods mulluscs fungi Protozoa algae mammals Number of described species Number of described species
13 Environmental Impact Insects can be found in almost every ecosystem on earth Insects are vital components of food webs Insects have important human impacts as well: Transmit disease to us, our crops and our domesticated animals Feed on the same things we like to eat $$: Pollination, silk, dyes, FOOD!
14 Success? 1. Insects are arguably the most successful group of animals alive 2. One-celled organisms may rival insects in number, but it s hard to tell 3. What about mammals?! Weight? size?
15 Life history strategies: The Tortoise vs. the hare 1. The Tortoise High survival rate, parental care, extended individual life, offspring training 2. The Hare Short lives, small size, high reproduction offsets high mortality
16 Insect adaptations that contribute to success 1. Exoskeleton 2. Jointed Appendages 3. Wings 4. Size 5. Metamorphosis 6. Ability to escape adverse conditions 7. Methods of Reproduction 8. Short generation time 9. Specialization 10. Methods of solving the water problem
17 Exoskeleton- Look ma, no bones! Protects from damage and water loss Overlapping chitin plates -- like a suit of armor Attachment for muscles
18 Jointed appendages Usually specialized for the insect s lifestyle Running, jumping, grasping, swimming, digging
19 Wings Give an advantage over non-flying organisms Insects have been flying for over 250 million years!
20 Size matters: Even the largest insects are small Easier to hide Easier to disperse Need less food.17 mm
21 Why aren t insects gigantic? Insects Limited By: 1. Respiratory system - Spiracles - Trachea - Air sacs Largest Insect ever: Meganeura 2. Musculo-skeletal system
22 Metamorphosis Allows one organism to utilize multiple habitats Or to become more specialized
23 Defense!! Brute force Monarch Poisonous Flying away Hiding in plain sight Viceroy Scaring away Non-poisonous
24 Diapause - A period of slow development and metabolism - Usually due to adverse weather: cold, lack of water, etc. Hibernal diapause - winter Aestival diapause - summer
25 Methods of solving the water problem Wax layers in cuticle Metabolic water Condense water from the air Conserve water by excreting pellets of uric acid, rather than urea
26 Methods of reproduction Apis mellifera The honey bee Dragonflies Aphids Tiger Beetles
27 Short generation time The insect with the shortest known generation time is the apple grain aphid (Rhopalosiphum prunifoliae/fitchii), which can bear live young only 4.7 days after being born. Other kinds of aphids are almost as prolific, bearing live young anywhere from five to seven days after being born. Such rapid-breeding aphids are parthenogenetic. They are so prolific that when they are born they already carry the embryos of their first children. Allows rapid adaptation
28 Specialization
29 Entomophagy Man eating Bugs
30 Proverbs VI: 6 Go to the ant, thou sluggard; consider her ways, and be wise.
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