1 / 15

SEAWEEDS PART I MARINE BOTANY FALL 2009 Dr. Mitra

WHAT ARE SEAWEEDS?. Macroalgae found in estuarine and marine environments.Non-vascular, multicellular, and photosynthetic plants.Chlorophyta, Rhodophyta, and Phaeophyta ---wall chemistry, chloroplast structures and pigmentation, arrangement of flagella in motile cells, and life cycles.Found in polar, tropical, and temperate waters around the globe..

jersey
Download Presentation

SEAWEEDS PART I MARINE BOTANY FALL 2009 Dr. Mitra

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    2. WHAT ARE SEAWEEDS? Macroalgae found in estuarine and marine environments. Non-vascular, multicellular, and photosynthetic plants. Chlorophyta, Rhodophyta, and Phaeophyta ---wall chemistry, chloroplast structures and pigmentation, arrangement of flagella in motile cells, and life cycles. Found in polar, tropical, and temperate waters around the globe.

    3. WHY DO WE CARE ABOUT SEAWEEDS? Primary producers-important role in the marine trophic structure Calcareous seaweeds –major contributors to the structure of coral reefs (they can make up 30% of the reef). Porolithon and Lithophyllum Mangroves and seagrass beds—seaweeds can provide a rich source of food for detritus feeders such as fiddler crabs. These seaweeds can also be important food sources for amphipods and isopods.

    4. WHY DO WE CARE ABOUT SEAWEEDS? Seaweeds that are edible are called “seavegetables” Health-promoting/medicinal properties (treatment of cancers, heart diseases, rheumatism, blood sugar, and flu) Effective fertilizers, soil conditioners, and are a source of livestock feed Used in wide range of products from ice cream to fabric dyes.

    5. WHY DO WE CARE ABOUT SEAWEEDS? Used as “biological scrubbers”—Ulva Gels from seaweeds—Agar is derived from red seaweeds (Gelidium, Gracilaria, Hypnea, and Pterocladia). It is used in microbiological growth medium and food industry. Carrageenans are obtained from Chondrus and Gigartina. Alginates are found in the cell walls of many brown seaweeds. Primary sources are Macrocystis, Ascophyllum, and Laminaria.

    6. SEAWEEDS AS AN ECOLOGICAL PROBLEM

    7. ECOLOGICAL CYCLE OF MACROALGA

    8. TYPES OF SEAWEEDS (MORPHOLOGICAL TYPES) Sheet like Filamentous group Coarsely branched group Thick-leathery group Jointed calcareous group Crustose group

    9. SHEET GROUP Thin, tubular or sheetlike. Soft Photosynthetic activity-high Toughness-low Examples: Ulva, Enteromorpha, Porphyra.

    10. FILAMENTOUS GROUP Delicate branches Texture-Soft Photosynthetic activity-moderate Toughness-low Chaetomorpha, Cladophora, Ceramium

    11. COARSELY BRANCHED GROUP Coarsely branched Pseudoparenchymatous to parenchymatous Texture—fleshy to wiry Toughness-low Gigartina, Chondrus, Agardhiella

    12. THICK LEATHERY GROUP Thick blades and branches Texture-leathery Photosynthetic rate –low Toughness-high Fucus, Laminaria, Sargassum, Padina

    13. JOINTED-CALCAREOUS TYPE Calcareous, upright Calcified segments, flexible joints Texture-stony Photosynthetic rate-very low Toughness-very high Corallina, Halimeda

    14. CRUSTOSE GROUP Encrusting Calcified, some uncalcified Texture-stony, tough Photosynthetic activity-low Toughness-very high Encrusting corallines, Ralfsia,Hildenbrandia

    15. BENTHIC MARINE ALGAE-MORPHOLOGICAL TYPES Which forms have the least resistance to herbivores? Which forms have the highest resistance to herbivores? Which ones are late successional forms? Sheet like Filamentous group Coarsely branched group Thick-leathery group Jointed calcareous group Crustose group

    16. OPPORTUNISTIC VS LATE SUCCESSIONAL FORMS

More Related