University:
Acadia University
Course:
BIOL 2663 | Marine Biology
Academic year:

2024
Views:

313

Pages:

4
Author:

Nabila n.

An Introduction to Seaweeds Seaweed Reproduction Sexual reproduction by many seaweeds involve complex life cycles often consisting of different generations. Save Bil Otar Seaweeds Copyright McGraw-Hill Education. Allinghts reserved. No reproduction or distribution without the prior written consent of McGraw-Ho Important pri primary producers algae or macroalga Often called marine algae or Eukaryotic, multicellular Lack leaves, stem, and roots of plants: Thallus-body of seaweed hold fast-root-like structures blades blades--leaf-like structures Stipe-- stem-like structures (these structures lack the conducting tissues [veins] of plants) Preumatocyst Types of Seaweeds Green Seaweeds (Green Algae): About 7,000 species, mostly marine Microscopic to macroscopic Photosynthetic pigments: chlorophylls a and as well as carotenoids (same as in true plants) Store excess energy as starch (as in plants) Pcellulose in cell walls (as in plants) Calcareous green algae - thallus with calcium carbonate Types of Seaweeds Brown Seaweeds (Brown Algae): About 1,500 species, almost all marine Some microscopic, most larger (up to more than 100 m [300 ft.]) Prefer Shallow, cold waters Contain chlorophyll a, c, and fucoxanthin (brown photosynthetic pigment) Brown Seaweeds Kelps: found in temperate and polar locations; the largest of the seaweeds In some species, like the giant kelp,, each individual can be hundreds of feet in length. Kelp forests are among the most productive (and richest) marine communities. High biodiversity of organisms associated with kelp forests Brown Seaweeds Sargassumis a brown seaweed that forms massive floating mats in the Sargasso Sea, a section of the Atlantic Ocean north of the West Indies. Pelagic sargassum provides shelter and structure in the open ocean, allowing animal communities to thrive in places that they are normally absent. (a) Image courtesy of the Life on the Edge Exploration Red Seaweeds (Red Algae) written consent of Education About 4,000 species, almost all marine 1a, phycobilins. Contain chlorophyll a, other red photosynthetic pigments and Most species are found in warm or cold shallow water, but some can be found in deep relatively deer water. Coralline algae - thallus accumulate calcium carbonate (Ex: Corallina)