More about cartilaginous fish

Explain how cartilaginous and bony fish regulate the salt found in water?
      Bony fish drink alot of seawater for hydration. Sharks reabsurb the area by the break down of protein back into their tissue.


What are some key differences in life's history between cartilaginous and bony fish?
       Sharks have a life strategy that requires slow growth to a relatively large size, while fish demonstrate rapid growth and reach maturity younger.


Describe how sharks reproduce.
         Their reproduction is internal. They have pelvic claspers that serve as the sperm conducting structure for internal fertilization.

Cartilaginous Fish

What makes cartilaginous fish different from others?
      Skeletons are made from cartilage

Examples of cartilaginous fish?
       Sharks, Rays, Chimeras

What is special about sharks eyes?
        They can protect their eye with a tough third eye lid

Difference between cartilaginous and bony fish?
a)Blood and heart
         Sharks have larger and fewer blood cells
b)External features
         Shark skin is covered by dermal deaticles
          Bony fish is covered by flat scales
c)Digestive evacuation
          Sharks kidneys and genitals empty into one opening
          Bony fish have two, rectum and anus

Marine Arthropods

Example of marine arthropods?
    Crustacea, pycnogonida, merostomata

Difference between arthropod and human skeleton?
     Arthropods skeletons are on the outside and is used as armor

Compare/contrast how arthropods and humans carry their blood?
     Arthropods have no arteries or veins to carry blood while humans do. Arthropods blood is pumped through sinuses.

How do arthropods eyes differ from yours?
      They have compound eyes, it is composed of small light sensitive organs called ommatidia.

How do humans use marine arthropods?
       As a food source.

Nine Major Animal Phyla

List Nine major animal phyla

• Sponges
• Coelenterates
• Flat worms
• Roundworms
• Segmented Worms
• Arthropods
• Mollusks
• Echinoderms
• Chordates

What habitat can the species be found?
       Marine(salt water), fresh water, terrestrial
How do they digest food?
     "Complete" digestive system and "Incomplete" digestive system
Have you seen an example of phyla?
     I have seen many, Arthropods, Mollusks, and Chordates in salt and fresh water phyla habitats. Such as when i fish at a lake or go to the beach

marine scince words of wisdom

"Dont wander away unseen for ten years...come back and visit often"

Sea turtle hatchlings have to make their way from their nest on shore to the open ocean, alone. From the

time they take their first swim until they return to the coastal ocean to forage as juveniles can take up to a decade and is called “the lost years” because they are so hard to track.

energy flows through the ecosystem

QUESTIONS
1. (a) Examples of primary produceres. (b) How do they get their energy?
2. (a) The second trophic level is made up of what creatures. (b) How do they get their energy?
3. Why do predators make up the third trophic level?

ANSWERS
1. (a) plants, algae, and some bacteria. (b) use solar energy to produce organic plant material through photosythesis.

2. (a) Herbivores (plant eaters). (b) get energy through photosynthesis.

3. because they eat second trophyic level animals and other small predators.

animal habitat structure

How does eelgrass density influence abundance of species in a ecosystem?

-Provide habitats for invertebrates, food, and cover for the many species that live there
-Its rhizomes help to trap sediment and anchor shifting sands, and its leaves dampen wave action. This helps to prevent beach erosion

http://www.oregon.gov/DSL/SSNERR/tides/tidesA13_eelgrassfacts.pdf
http://www.crd.bc.ca/watersheds/protection/wildlife-plants/eelgrass.htm