February 15, 2017

2/15/2017

Detritivores and Decomposers

  • Feed on Detritus
  • Detritus is dead organic matter-dead bodies of animals, plans, fungi, etc.
  • Includes animal wastes, secretions
  • Animal detritivores are called scavengers
  • Examples?
    • Crabs, lobsters, rodents, insects

Decomposers

  • Microbial detritivores are often called decomposers
  • Bacteria
  • Fungi
  • Secrete enzymes onto detritus, breakdown molecules, release CO2 and heat

The Whale Pump

Image result for the flow of energy and cycling nutrients

THE WHALE PUMP” UNDER  CREATIVE COMMONSATTRIBUTION-SHARE ALIKE 2.5 GENERIC

The Flow of Energy and Cycling Nutrients

NUTRIENT CYCLE” UNDER  CREATIVE COMMONSATTRIBUTION-SHARE ALIKE 2.5 GENERIC

Nutrient Upwelling

 

UPWELLING” UNDER PUBLIC DOMAIN

Major Marine Anima Phyla

  • Porifera
  • Cnidaria
  • Annelida
  • Arthropoda
  • Chordata
  • Mollusca
  • Echinodermata

Choanoflagellattes

Syconoid                      Leuconoid

Class Hydrozoa

Colonial Polyps                        Medusa

Jellyfish Life Cycle

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JELLYFISH LIFE CYCLE” UNDER PUBLIC DOMAIN

Phylum Ctenophore (Comb Jelly)

COMB JELLY” UNDER PUBLIC DOMAIN

Coral Reefs

  • Terrestrial ecosystems are dominated by a great variety of plants (Primary Producers) and fewer animal consumers
  • But a coral reef contains a rich diversity of consumers and only a few plants
  • Corals and Sponges feed by filter-feeding – Remove plankton from the water
  • But tropical seas are virtually devoid of Plankton! (Makes them so transparent)
  • So – Where are the primary producers?
    • They are embedded in the tissue of the corals
  • Reef-building corals contain endosymbiotic (Mutualistic) algae called Zooxanthellae

Coral, Coral Reef, Reef, Sea, South Sea, Salt Water

CORAL REEF” UNDER PUBLIC DOMAIN

Endosymbiosis: The relationship between a host organism and a second species that lives inside the hosts cells

 

Coral – Zooxanthellae Mutualism

  • The zooxanthellae provide organic compounds (food) via photosynthesis to the coral animal
  • In return, the zooxanthellae get a place to live and a steady supply of nutrients from the corals waste products
  • Nutrients are recycled – very efficient system!

File:Coral detail.jpg

CORAL DETAIL” UNDER  CREATIVE COMMONS ATTRIBUTION-SHARE ALIKE 2.0 GENERIC