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|Marine birds |
Seaweed is a term applied to multicellular, marine algae which are large enough come be seen by the eye unaided. Part can grow to approximately 60 metres in length. Seaweeds include members that the red, brown and also green algae. They space members the the kingdom Protista meaning they room not Plants. They do not have the vascular device (internal move system) of plants and do not have actually roots, stems, leaves and flowers or cones. Choose plants they usage the pigment chlorophyll for photosynthesis but likewise contain various other pigments which might be coloured red, blue, brown or gold. they are separated into three groups:
Brown Algae (Phaeophyta) green Algae (Chlorophyta) Red birds (Rhodophyta)
Diversity in naval algae
|Blue-green algae are not marine algae. They are in a group referred to as cyanobacteria and also are much more closely pertained to bacteria. Part cyanobacteria kind brown, green, red or purple tufts on coral reefs. |
To make it through seaweeds require salty or brackish water, sunlight and a surface to attach themselves to. Due to the fact that of these factors they are generally found in the littoral region (this includes the intertidal zone but generally extends out lot further). They room usually found on rocky rather than top top sand or shingle shores.
Seaweeds space a food source for marine pets such together sea urchins and fishes, and are the base of some marine food webs. Lock also provide shelter and a residence for numerous fishes, invertebrates, birds and mammals.
The kelps type dense woodlands which support whole underwater communities providing both food and shelter. Intertidal seaweeds can be exposed to numerous environmental stresses consisting of drying out as soon as not under water, temperature and also salinity changes and wave action.
Kelp (a brown alga) woodland
|Structure of algae |
Thallus: the whole body that a seaweed. Lamina: a flattened framework that is each other a leaf. Sorus: a cluster of spores spore. Air bladders: a hollow, gas-filled structure body organ which helps the seaweed float, uncovered on the blade). Other seaweeds (e.g. Kelp) have floats which space located between the lamina and also stipe. Stipe: a stem-like structure, not all seaweeds have actually these. Holdfast: a committed structure ~ above the base of a seaweed i beg your pardon acts as an “anchor” permitting it to attach to a surface (e.g. A rock). Haptera: finger-like expansions of holdfast anchoring to benthic substrate.
Seaweeds beat a very important functions in many marine communities. They space a food source for numerous marine pets such as sea urchins and also fishes, and type the base of part food webs. They also administer shelter and also a home for countless fishes, invertebrates, birds, and also mammals.
framework of naval algae
Seaweed life and also reproductive cycles have the right to be fairly complicated. Part seaweeds are perennial, living for many years, while space annuals. Yearly seaweeds generally begin to prosper in the spring, and also continue transparent the summer. Some red seaweeds have actually a life expectations of 6 to 10 years.
Seaweeds have the right to reproduce sexually, by the authorized of specialized male and also female reproductive cells, called gametes. ~ they room released indigenous the sporophyte, the spores settle and grow right into male and female plants called gametophytes. The gametophytes produce gametes (sperm or eggs). The sperm and also eggs space either preserved within the gametophyte plant body, or released into the water. Eggs are fertilized as soon as the sperm and also egg fuse together, and also a zygote is formed. Zygotes develop and also grow right into sporophytes, and the life cycle continues.
Seaweeds display a variety of different reproductive and life cycles and the description above is just a general instance of one type, referred to as alternation that generations. In a couple of species there is an alternating sexual and also asexual reproductive procgimpppa.orgre with every generation. seaweeds can likewise reproduce asexually with fragmentation or division. This occurs once parts the a tree break off and also develop straight into new individuals. Every offspring resulting from asexual reproduction room clones; they space genetically similar to every other and the parental seaweed.
Reproduction of birds
Uses of Seaweed
Seaweeds area food resource for humans particularly in east Asia, it is most commonly connected with Japanese food. Seaweeds also are supplied to do a number of food additives such as alginates and also carrageenan i beg your pardon is used in cooking and baking together a vegetarian alternate to gelatine.
Many algae are used as medicine. Alginates are supplied in wound dressings and also in the manufacturing of dental moulds and agar is used really widely in Microbiology to assist grow bacter cultures.
Seaweeds space ingredients in toothpaste, cosmetics and also paints and also are supplied in industrial assets such as document coatings, adhesives, dyes, gels, explosives and many more.
Much of the oil and also natural gas we use today created from seaweeds which partly decomposed on the sea floor many millions of years ago.
Japanese food provides seaweeds broadly - Kombu a brown alga and Kim nori a red alga
http://en.wikipedia.org/wiki/Seaweed /www.oilgae.com/algae/types/marine_algae/marine_algae.html www.reef.crc.org.au/discover/plantsanimals/algae/index.html /www.cornishseaweedresources.org/lifecycle.htm http://marinelife.about.com/od/plants/tp/typesofalgae.htm /www.reef.crc.org.au/discover/plantsanimals/algae/index.html http://en.wikipedia.org/wiki/Brown_algae http://en.wikipedia.org/wiki/Red_algae http://en.wikipedia.org/wiki/Green_algae www.seaweed.ie/algae/chlorophyta.html
Red Seaweed image © Brent Wilson via Flickr
Algae: The World"s Most vital Plants think it or not, her life depends on algae! sign up with Scripps" Institution"s Russell Chapman as he discusses the crucial roles algae have actually played in the development of life as we know it. Series: "Perspectives on s Science" <12/2006>