2 Zooplankton Animals and animal-like organisms that float and drift Unicellular protists and multicellular (jellyfish)Most are microscopicCrab Larvae
3 Diversity Meroplankton Temporary Embryos or larvae of fish, crabs, sponges, lobsters, clams, and other invertebratesMature and settle to bottom as adultsSlipper Lobster Larva
4 Diversity Permanent Zooplankton Species that remain in the plankton population for whole life cycleForaminiferan (Foram)Hole-bearingUnicellular protistEncased in calcium carbonate shellParts of cytoplasm flow out through holes to catch foodDead organisms form chalk deposits (Cliffs of Dover)
5 Diversity Radiolarian Permanent Unicellular Cell wall of silica TransparantLong spines like spokes of a wheel for buoyancy and protection
6 Diversity Copepod Most numerous Tiny, shrimp-like animal (size of a grain of sand)Feeds on phytoplankton (diatoms)Eaten by larger zooplankton, fish, and whalesImportant link in many food chainsCopepod!
7 Sea Soup Plankton are tiny food particles suspended in the “soup” Whales feed by straining food from water, called filter feedingKrill (4-5 cm)Shrimp like zooplanktonIn AntarcticPotential food source for humans
8 Sea Soup Plankton form the foundation of the marine food chain Bottom dwelling mollusks (muscles, clams, oysters, scallops) filter feed on planktonClamsCells inside have microscopic cilia that create a current through body
9 Protozoans Includes forams and radiolarians Found on surface and in bottom sedimentsUnicellularAnimal likeKingdom ProtistaSubdivided into 3 phyla:CiliophoraZoomastiginaSarcodina
10 Sarcodina Forams, radiolarians, and amoebas Live on surface of substratesMove and eat using psuedopods
11 Sensitivity Ability of an organism to respond to environmental stimuli VorticellaResponds to touch by contracting its stalk into a coilAvoidance reaction to stimuli that may be harmfulAlso contracts spontaneously
12 Reproduction Vorticella Paramecium Asexual reproduction Binary fission – division of prokaryotic cell into 2 identical cellsParameciumSexual reproductionConjugation2 parent protozoans exchange parts of their micronuclei when they come in contact (exchange genetic material)Increases genetic variationBinary fission then occurs, but with unique offspring.