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AP Bio-Biodiversity: The Eukarya

Bonus presentation on Eukarya. Image Credits: Biology (Campbell) 9th edition, copyright Pearson 2011, & The Internet. Provided under the terms of a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. By David Knuffke.

David Knuffke

on 26 June 2014

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Transcript of AP Bio-Biodiversity: The Eukarya

Before We Begin
Big Questions
Make sure you can
Last Common Ancestor
Many Phyla of Worms
Bryophytes: Mosses, liverworts, etc.
Seedless Vascular Plants: Ferns, horsetails, etc.
Gymnosperms: Evergreens, Ginkos, etc.
Angiosperms: Flowering plants
Our understanding of life's diversity is constantly expanding.

This presentation reflects a very brief explanation of the relationships among living organisms. Not all phyla are represented.

The "branches of the tree" only represent general relationships (and a generally accurate phylogeny), not time or abundance or anything else.

The blue arrows (eukarya- plants and animals only) spotlight important evolutionary transitions.
General Characteristics:
eukaryotic, almost entirely unicellular*
mixed nutritional modes
General Characteristics:
eukaryotic, multicellular, photoautotrophic
cell walls made of cellulose
General Characteristics:
eukaryotic, multicellular
heterotrophic (internal digestion)
no cell walls
*EXCEPTION: Seaweeds, Colonial stages of some life cycles
Some Example Protists
The classification of protists is beyond the scope of this course.

Classification of the Protists is undergoing constant revision.

Relationships among protist lineages are determined through molecular analysis.

You need to know three things:
How to recognize when an organism is a protist
The ancestors of all of the other organisms in the eukarya domain were protists.
The ecological roles that protists play
Endosymbiosis has occurred multiple times in the protists.
unicellular algae produce most of the oxygen you breathe.
The three major divisions of seaweeds are green, red, & brown.
The green seaweeds (
) are the ancestors of the plant kingdom
are two classic examples of heterotrophic protists.
is a protist that can carry out autotrophic and heterotrophic nutrition.
Protists play major roles in aquatic ecosystems as both producers and consumers
Protist diseases are common in the developing world, and very difficult to treat (why?)
There is a wide diversity of life cycles in protists (shocking, I know).
Many protists have very complex, multi-stage life cycles.
Life Cycles
Protists alternate between sexual and asexual reproduction strategies
No vascular tissue or seeds
the gametophyte generation is dominant, with a dependent sporophyte
Vascular tissue, but no seeds.
Sporophyte is dominant, dependent gametophyte.
Motile, free-swimming gametes.
Vascular tissue, seeds develop exposed or in cones
Sporophyte is dominant, microscopic gametophyte
Includes all "evergreen trees"
Have flowers. Vascular tissue, seeds develop in floral ovary (fruit)
Sporophyte is dominant, microscopic gametophyte
Classified into 2 major groups: monocots and dicots
Most diverse group of plants (why so successful?)
Vascular Tissue!
Pollen & Seeds!
Flowers & Fruit!
What makes a plant?
General Characteristics:
eukaryotic, almost entirely multicellular*
Heterotrophic (external digestion)
Cell walls made of Chitin
Anatomy & Physiology
Arranging the animals:
aka: sponges

Asymmetrical, sessile, filter feeders, no tissues
aka: jellies, corals, anemones

radially symmetrical, 2 tissue layers, specialized stinging cells
aka: worms, lots of worms.

bilateral symmetry, then it depends on the phylum
aka: snails, clams, slugs, octopi, etc.

bilateral symmetry, three main body segments (head, viscera, foot)
shell made of CaCO secreted by the "mantle" organ
Wide diversity of feeding strategies
aka: crustaceans, insects, arachnids, etc.

bilateral symmetry, three main body segments (head, thorax, abdomen)
exoskeleton made of chitin
Wide diversity of feeding strategies
aka: seastars, sea cucumbers, sea urchins, etc.

special derived "pentaradial" symmetry
endoskeleton made of ostia plates
water vascular system for locomotion
predators and filter feeders
"spiny skin"
"jointed foot"
What it is:
What it is:
What they are:
What they are:
: sleeping sickness
Plasmodium: malaria
molecular analysis suggests that plants evolved from green algae
Plants grow continuously during their life cycle.

": permanently undifferentiated tissue. Site of plant growth
Alternation of Generations
" Life cycle:
2 multicellular forms (
Evolutionary trends in plant forms:
evolutionary time
Tissue that transports water (
) and sugar (
) throughout the plant.
Why does it matter?
Vascular Bundles
" of xylem and phloem in a celery stalk
Why do they matter?
: a water-free mode of dispersing sperm.

: a protective, nourishing, dispersive place for early embryo development
typical pollen structure:
Dandelion seeds are adapted for wind dispersal:
"naked seed"
gymnosperms include the largest plants on Earth
Why do they matter?
: a structure that contains both reproductive organs of the plant and is adapted for pollination.

: a structure that houses fertilized seeds and aids in their dispersal.
"Mmm... Nom Nom Nom!"
fruit consumption by animals = seed deposition in fertilizer
"Male part"
"Female part"
Fungi evolved from a heterotrophic protist lineage.

The major divisions of modern fungi are classified by the structures that their spores develop in.
Fungi have a very simple anatomy.
: the loose, thread-like body of the fungus.
Fruiting body
: develops from mycellium to produce spores.
A "fairy ring" of mushrooms (all one organism) that forms as mycellium radiates outward:
Fungi reproduce sexually and asexually.
Immediately after fertilization ("plasmogamy"), fungi undergo meiosis ("karyogamy") and return to the haploid condition
Fungi are major decomposers of other organisms.
mold on an orange
3 Examples of Fungal Plant Diseases
Some fungi exist in interesting symbiotic relationships
a lichen is a relationship between a fungus and an algae
leaf-cutter ants cultivate a fungus that produces an antibiotic
Fungi can also be parasites, causing disease and even "stalking" prey.
To The Chordates!
(more next time)
How is the Eukaryotic domain of life organized?

What are the characteristics of eukaryotes that are used to classify them?
Learn your floral anatomy!
Animals evolved from a group of protists called "Choanoflagellates"
Early events in development are a major dividing line between animal phyla
The organization of the body cavity (if it exists) is another major identifying trait of animals
Porifera are the most basal (evolutionarily basic) organisms that we classify as animals.

Choanocytes: "Collar cells" responsible for moving water through the sponge and filtering out food.
Cnidarians are predators and filter feeders.

Nematocysts: stinging barb organelles that cnidarians use to paralyze prey.

Cnidarians have two tissue types.
Why does it Matter?
the concentration of sensory organs in the anterior ("head") of the organism.

necessitates bilateral symmetry
spicules give sponges structure
Cnidarians come in two major forms
jellyfish are only one group of cnidarians
Coral consist of many individual polyps living colonially
We're not really interested in keeping all worm phyla straight.
You need to know three groups of worms:
Phylum Platyhelminthes: The "Flatworms"- Acoelomates
Phylum Nematoda: The "Roundworms"- Pseudocoelomates
Phylum Annelida: Segmented worms- Coelomates
is a typical example of a playtyhelminthe
Acoelomates do not have a body cavity.

This is the most primitive 3-germ layer animal body plan.
this is a pretty marine flatworm
Blood flukes and Tapeworms are good examples of parasitic flatworms
Pseudocoelomates have a body cavity that is lined by 2 different tissue layers (mesoderm and endoderm)
C. elegans
is a roundworm that is widely used to study animal development.
is a parasitic roundworm that lives in mammalian muscle tissue (most notably pork)
leeches are another well-known group of parasitic roundworms
Coelomate organization has a true body cavity lined entirely by one germ layer (mesoderm).
This allows organs to be suspended in the cavity, and protected.
All phyla that we will look at from this point onward are coelomates.
Earthworms are very typical annelids, though there are many marine annelids, as well.
Bottom line:
You should be familiar with general characteristics and example organisms of these three worm phyla.
You should be able to explain the differences in body plans shown in these phyla.
That's it.
The structure of a mollusc's shell is useful for keeping the different groups separate.
Gastropods have a one-piece shell (or no shell at all)
Bivalves have a 2-piece shell
Cephalopods have mostly lost their shells.

They have the largest brain:body ratio of any invertebrate animals
Chitons have a series of interlocking plates
Though plentiful in terms of diversity, molluscs have suffered more recorded extinctions than any other phylum of organisms (why?)
Arthropods are the most abundant phylum of animals.
There are more arthropods than all other species of animal combined.
common aquatic arthropods.
Usually 10 legs (some have 8 or 12)
The arthropod exoskeleton gives them very clear body segmentation
Trilobites: a very common arthropod fossil
Arthropods undergo a very dramatic metamorphosis when moving from larval form to adult form
Some example arthropods:
very common terrestrial arthropods
6 legs
"God has an inordinate fondness for stars and beetles."
-JBS Haldane (evolutionary biologist)
another group of very common terrestrial arthropods
8 legs
Echinoderms are only found in aquatic environments.
Their radial symmetry is a special, derived kind that splits their body segments into 5 identical sections.
They are the first group of deuterostomes that we have encountered.
Seastars have typical echinoderm anatomy
6 kinds of echinoderms
sea stars
sea cucumbers
brittle stars
sea urchins
sea lillies
sea daisies
Echinoderms have amazing regenerative ability. One arm of a sea star can give rise to an entire organism
Identify members of all of the groups that were discussed in this presentation if given information about their characteristics.

Explain why the particular example organisms discussed in this presentation belong in particular groups.

Identify the characteristics most useful for grouping members of each kingdom discussed in this presentation.

Explain the evolutionary trends demonstrated in the plants and animals.

Explain the advantages and tradeoffs of the strategies and adaptations that were discussed in this presentation.

Explain why the phylogeny discussed in this presentation is hypothetical and subject to continuing revision.
Since their divergence, the eukaryotes have evolved into four major groups (tranditionally referred to as kingdoms)
Amoeba eating!
(now with 200% more epic music!)
It makes me want to Sing and Dance!
Not Just Nematodes!
Pneumatocysts are cool!
Full transcript