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HOW MANY PHYLUMS ARE THERE?
- 1. Annelida
- 2. Anthropoda
- 3. Chordata [HUMANS]
- 4. Cnidaria
- 5. Echinodermata
- 6. Mollusca
- 7. Nematoda
- 8. Platyhelminthes
- 9. Porifera
Phylum Porifera - WHO?
Phylum Coelenterata WHO?
The Coelenterates: jellyfish, hydras, corals
Phylum Platyhelminthes WHO?
The Flatworms: planaria, tapeworms
Symmetry: Flatworms have bilateral symmetry and they have a definite head and tail region.
Phylum Nematoda WHO?
Symmetry: Bilateral symmetry with an anterior end and a posterior end.
Phylum Annelida WHO?
The Segmented Worms: earthworm, leech, sandworm.
Symmetry: Bilateral; anterior and posterior ends; dorsal and ventral surfaces.
Segmented both internally and externally
Phylum Arthropoda WHO
The Arthropods: insects, spiders, crustaceans
Phylum Mollusca WHO?
The Mollusks: clams, snails, oysters, octopus
Phylum Echinodermata WHO?
The Echinoderms: sea stars, sea urchins
Phylum Chordata WHO?
The Chordates: fish, reptiles, amphibians, birds, mammals
How Do Biologists Characterize Populations?
- unstructured population
- all individuals are subject to the same general ecological pressures.
rates of growth, reproduction, and mortality are roughly the same for all individuals.
EX: bacterial colony
- structured populations individuals can differ from one another in ways that make some individuals more susceptible to mortality or more likely to reproduce than others.
EX: insects, sea turtles, trees, and fish.
In these cases, mortality is often much higher for younger (and/or smaller) individuals.
Reproduction is often delayed until individuals are older (and/or larger).
LOGISTIC GROWTH...COLUMNS AND FORMULAS.
DEFINE r SELECTIVE SPECIES
- LOTS OF OFFSPRING
- MANY WILL NOT SURVIVE.
- LITTLE PARENTING
DEFINE K SELECTIVE SPECIES
SALMANDER OR HUMAN
- FEW OFFSPRING
- WILL SURVIVE LONGER
- LOTS OF PARENTING
WHAT COMES FIRST EXPERIENTIAL OR LOGISTIC GROWTH?
EXPERIENTIAL THEN LOGISTIC.
LOGISTIC HAS EQUILIBRIUM WITH THE "K" FACTOR.
WHAT IS THE COLUMNS AND FORMULAS FOR EXPONENTIAL GROWTH?
- N= POPLUATION
- r = B-D/N
- (IN THIS EXAMPLE r WAS SOLVED, IT'S .3)