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Arthropods. Why So Successful? Why So Abundant?. Why So Successful? Why So Abundant?. Fact: There are more than 1 million different species of arthropod Fact: for every one human, there are 1 million arthropods on Earth. Exoskeleton. Strong Protective Flexible at the joints.

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Arthropods

Why So Successful?

Why So Abundant?


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Why So Successful?Why So Abundant?

Fact:

There are more than 1 million different species of arthropod

Fact:

for every one human, there are 1 million arthropods on Earth


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Exoskeleton

  • Strong

  • Protective

  • Flexible at the joints


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Segmentation & Appendages

  • Variety of appendages ►

    efficient locomotion

    Legs (walking, hopping, swimming)

    Wings (flying)


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Segmentation & Appendages

  • Variety of mouth parts ►

    many feeding patterns


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Respiration:Air Piped Directly to Cells

  • O2 direct to muscles ► spiracles to tracheae

    permits rapid movement


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Highly Developed Senses

  • Touch E.g. antennae, sensilla

  • Smell / chemosensors

  • Hearing / Vibration E.g. tympanae (# 11)

  • Balance


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Complex Behaviors

1. Insect Societies

(division of labor)

2. Many innate behaviors (genetically programmed) permit survival

E.g.

* weaving of

spider webs,

* building of bee hives,

* bee dances


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Bee dances

  • Dance performed in hive

  • Pattern indicates distance & direction of food source


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Bee Dance- Round Dance

  • This is used when the source of food (nectar or pollen) is less than 100 meters away


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Bee Dances- Waggle Dance

  • For food supplies more than 100 meters the waggle dance is used.


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Metamorphosis

Two Types:

  • Incomplete

    young look like mini adults

    egg →nymph (instar)→ adult

    E.g. grasshopper, arachnids, centipedes, millipedes


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Metamorphosis

2. Complete

young do NOT look like adults

egg → larva

→ pupa (cocoon/chrysalis) → adult

E.g. bees, butterflies, moths, beetles


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Why So Successful?Why So Abundant?

What are six reasons that Arthropods are so successful?


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