Eukarya. Eukarya includes all organisms with eukaryotic cells Examples: plants animals fungi algae single-celled animal-like protozoa

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1 Eukarya Eukarya includes all organisms with eukaryotic cells Examples: plants animals fungi algae single-celled animal-like protozoa

2 Protists Eukaryotic; but comprises its own Kingdom Protista Algae - aquatic, photosynthetic organisms Diatoms Dinoflagellates Protozoans Foraminiferans, Radiolarians, Ciliates Single and multi-cellular

3 Unicellular Algae Green Algae Mostly freshwater and terrestrial 10% of species are marine Brown Algae Almost all species are marine Sargassum (Sargasso seaweed) Macrocystis (Giant Kelp) Red Algae plants grow up to 300 ft can grow 20 /day form kelp beds or kelp forests Harvested for Algin (used in cosmetics and ice cream). Agar and carrageenan: gelling and thickening agents

4 Diatoms Extremely diverse and distinct members of marine phytoplankton Unicellular Diatom structure Enclosed in a box-shaped organic cell wall with silica (SiO2), called a frustule Holes in cell wall allow cholorplast to capture light and dissolved gases to enter.

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6 Dinoflagellates Unicellular protists with 2 flagella (used for motility) Globular, plated outer shell that is made of cellulose Photosynthetic, but also can absorb nutrients Most are planktonic (primary producers) Can be bioluminescent Bioluminescent Bay, Puerto Rico (pg. 97) Red tides produce toxin in water when in Harmful Algal Blooms (HABs)

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8 Unicellular Protists Amoeboid Protozoans All have an organelle called a pseudopod an extension of the cell surface that can change shape and is used for locomotion and food capture Are heterotrophs consuming bacteria and other small organisms

9 Amoeboid Protozoans

10 Amoeboid Protozoans Major Protozoans: Foraminiferans Radiolarians Ciliates

11 Amoeboid Protozoans Foraminiferans (forams) have branched pseudopods that form elaborate, net-like structures used to: snare prey crawl reduce sinking rate (pelagic) consume bacteria and diatoms some harbor symbiotic green and red algae and zooxanthellae Have shell (test) made from CaCO3 Bottom of the ocean (benthic)

12 Foraminiferans

13 White Cliffs of Dover Foraminiferans

14 Unicellular protists Radiolarians Planktonic (primary producers) Shells make of silica (glass) Contains a needle-like pseudopodia Dead remains cover large portions of the ocean bottom as radiolarian ooze.

15 Radiolarians

16 Ciliates Ciliates protozoans that have cilia (hair-like growths) for locomotion and for gathering food membranelles tufts or long rows of fused adjacent cilia Heterotrophs cytostome an organelle serving as a permanent site for phagocytosis of food planktonic major links in marine food chains form symbiotic and parasitic relationships Paramecium

17 Ciliates

18 Fungi General features of fungi eukaryotes with cell walls of chitin filamentous fungi grow into long, multi-cellular filaments called hyphae that can branch to produce a tangled mass called a mycelium Important to marine ecosystems as heterotrophic decomposers that recycle organic material

19 Maritime Lichens Lichens: mutualistic associations between a fungus and an alga fungi are usually ascomycotes algae are usually green or blue-green bacteria The fungus provides attachment, general structure, minerals, moisture The alga produces organic matter through photosynthesis

20 Marine Viruses Viruses are diverse and are more abundant than any other organism in the sea Have significance for marine food webs, population biology and diseases of marine organisms Viruses of marine eukaryotic hosts first reported in the 1970s

21 Biodiversity and Distribution of Marine Viruses 10 times more abundant than marine prokaryotes, may reach virons per liter of seawater, per kilogram of sediment Estimated 100 to 10,000 genotypes Most planktonic viruses are icosahdral or binal bacteriophages ( bacteria eaters ) with lytic life cycles Sediment viruses are typically helical and lysogenic

22 Marine Microbes DIOQ