Brown algae - Revision history

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2025-03-23T10:50:45Z

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← Older revision		Revision as of 10:50, 23 March 2025
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	''~~'Brown Algae'~~'' ~~is a large group of~~ [[~~algae~~]] ~~that are classified under the~~ phylum ~~'''Phaeophyceae'''. They are predominantly marine organisms and are known for their distinctive brown or olive-green color, which is a result of the presence of the pigment~~ [[~~fucoxanthin~~]] ~~in addition to~~ [[~~chlorophyll~~]].		{{Short description\|A group of mostly marine, multicellular algae}}
			{{Taxobox
			\| name = Brown algae
			\| image = Laminaria_hyperborea.jpg
			\| image_caption = ''Laminaria hyperborea''
			\| domain = Eukaryota
			\| unranked_regnum = SAR
			\| unranked_superphylum = [[Heterokonta]]
			\| phylum = [[Ochrophyta]]
			\| classis = [[Phaeophyceae]]
			}}

	~~== Characteristics ==~~		'''Brown algae''' (class ''Phaeophyceae'') are a large group of mostly marine, multicellular algae, including many seaweeds located in colder waters within the Northern Hemisphere. They play a significant role in marine environments, both as food and for the habitats they form.

	Brown algae are ~~multicellular and range in size~~ from ~~tiny filamentous forms to large complex structures. The largest species, such as~~ the [[~~kelp~~]], ~~can reach up to 50 meters in length. They possess a unique organ known as~~ the [[~~holdfast~~]] which ~~helps them anchor to the substrate~~.		==Characteristics==
			Brown algae are characterized by their brown or greenish-brown color, which results from the presence of the pigment [[fucoxanthin]], which masks the green of the [[chlorophyll]]. They are unique among algae in having this pigment, which is responsible for their distinctive color.

	~~== Life Cycle ==~~		[[File:Bladder_Wrack_(Fucus_vesiculosus)_-_geograph.org.uk_-_224125.jpg\|thumb\|right\|''Bladder Wrack'' (''Fucus vesiculosus'')]]

	The ~~life cycle~~ of brown algae ~~is characterized by an alternation of generations. This involves a~~ [[~~haploid~~]] ~~phase~~, ~~where the cells contain~~ a ~~single set~~ of ~~chromosomes~~, and ~~a [[diploid]] phase~~, ~~where the cells contain two sets of chromosomes~~.		The cell walls of brown algae contain [[alginic acid]], a polysaccharide that is used commercially as a thickening agent in foods and other products. The thallus of brown algae is typically differentiated into a holdfast, stipe, and blade, although these structures can vary greatly in form and function.

	== ~~Ecology~~ ==		==Reproduction==
			Brown algae exhibit a wide range of reproductive strategies, including both sexual and asexual reproduction. Many species have a complex life cycle involving alternation of generations, with both haploid and diploid stages.

	~~Brown algae play a significant role in marine environments, particularly in~~ [[~~coastal ecosystems]]. They provide food and shelter for a variety of marine organisms~~. ~~Some species of brown algae are also of economic importance, used in food and as sources of [[alginates~~]]~~, a thickening and stabilizing agent used in various industries.~~		[[File:Laminaria_Life_Cycle.png\|thumb\|left\|''Laminaria'' Life Cycle]]

	~~== Classification ==~~		In the sexual reproduction of brown algae, gametes are produced in specialized structures called [[conceptacles]], which are found in some species such as ''Fucus''. The gametes are released into the water, where fertilization occurs.

	The classification of brown algae has been a subject of much debate. They are currently classified under the phylum Phaeophyceae, which is divided into several orders based on morphological characteristics.		[[File:Fucus_conceptacle_XS3.jpg\|thumb\|right\|''Fucus'' conceptacle]]

	== ~~See Also~~ ==		==Ecology==
			Brown algae are important components of marine ecosystems. They form dense underwater forests, known as [[kelp forests]], which provide habitat and food for a wide variety of marine organisms. These forests are among the most productive and dynamic ecosystems on Earth.

			[[File:Kelp-forest-Monterey.jpg\|thumb\|left\|Kelp forest in Monterey]]

			==Economic Importance==
			Brown algae are harvested for their alginates, which are used in a variety of industries, including food, pharmaceuticals, and textiles. They are also used as fertilizers and soil conditioners.

			==Diversity==
			The class ''Phaeophyceae'' includes a wide variety of species, ranging from small filamentous forms to large kelps. Some well-known genera include ''[[Laminaria]]'', ''[[Fucus]]'', ''[[Sargassum]]'', and ''[[Macrocystis]]''.

			[[File:Saccharina_latissima_NOAA.jpg\|thumb\|right\|''Saccharina latissima'']]

			==Related pages==
	* [[Algae]]		* [[Algae]]
	* [[Kelp]]		* [[Kelp]]
	* [[~~Fucoxanthin~~]]		* [[Seaweed]]
	* [[~~Chlorophyll]]~~		* [[Marine biology]]
	* [[Haploid]]
	* [[Diploid]]
	* [[Coastal ecosystems]]
	* [[Alginates]]

			[[Category:Brown algae]]
			[[Category:Ochrophyta]]
	[[Category:Algae]]		[[Category:Algae]]
	~~[[Category:Marine biology]]~~
	~~[[Category:Phaeophyceae]]~~

	~~{{Algae-stub}}~~
	~~<gallery>~~
	~~File:Laminaria_hyperborea.jpg\|Laminaria hyperborea~~
	~~File:Bladder_Wrack_(Fucus_vesiculosus)_-_geograph.org.uk_-_224125.jpg\|Bladder Wrack (Fucus vesiculosus)~~
	~~File:Capo_Gallo_Dicotoma.jpg\|Brown algae~~
	~~File:Laminaria_Life_Cycle.png\|Laminaria Life Cycle~~
	~~File:Fucus_conceptacle_XS3.jpg\|Fucus conceptacle~~
	~~File:Saccharina_latissima_NOAA.jpg\|Saccharina latissima~~
	~~</gallery>~~
	~~<gallery>~~
	~~File:Kelp-forest-Monterey.jpg\|Kelp forest in Monterey~~
	~~File:Laminaria_hyperborea.jpg\|Laminaria hyperborea~~
	~~File:Bladder_Wrack_(Fucus_vesiculosus)_-_geograph.org.uk_-_224125.jpg\|Bladder Wrack (Fucus vesiculosus)~~
	~~File:Capo_Gallo_Dicotoma.jpg\|Capo Gallo Dicotoma~~
	~~File:Laminaria_Life_Cycle.png\|Laminaria Life Cycle~~
	~~File:Fucus_conceptacle_XS3.jpg\|Fucus conceptacle~~
	~~File:Saccharina_latissima_NOAA.jpg\|Saccharina latissima~~
	~~</gallery>~~

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2025-02-18T11:13:26Z

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← Older revision		Revision as of 11:13, 18 February 2025
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	File:Bladder_Wrack_(Fucus_vesiculosus)_-_geograph.org.uk_-_224125.jpg\|Bladder Wrack (Fucus vesiculosus)		File:Bladder_Wrack_(Fucus_vesiculosus)_-_geograph.org.uk_-_224125.jpg\|Bladder Wrack (Fucus vesiculosus)
	File:Capo_Gallo_Dicotoma.jpg\|Brown algae		File:Capo_Gallo_Dicotoma.jpg\|Brown algae
			File:Laminaria_Life_Cycle.png\|Laminaria Life Cycle
			File:Fucus_conceptacle_XS3.jpg\|Fucus conceptacle
			File:Saccharina_latissima_NOAA.jpg\|Saccharina latissima
			</gallery>
			<gallery>
			File:Kelp-forest-Monterey.jpg\|Kelp forest in Monterey
			File:Laminaria_hyperborea.jpg\|Laminaria hyperborea
			File:Bladder_Wrack_(Fucus_vesiculosus)_-_geograph.org.uk_-_224125.jpg\|Bladder Wrack (Fucus vesiculosus)
			File:Capo_Gallo_Dicotoma.jpg\|Capo Gallo Dicotoma
	File:Laminaria_Life_Cycle.png\|Laminaria Life Cycle		File:Laminaria_Life_Cycle.png\|Laminaria Life Cycle
	File:Fucus_conceptacle_XS3.jpg\|Fucus conceptacle		File:Fucus_conceptacle_XS3.jpg\|Fucus conceptacle
	File:Saccharina_latissima_NOAA.jpg\|Saccharina latissima		File:Saccharina_latissima_NOAA.jpg\|Saccharina latissima
	</gallery>		</gallery>

Prab: CSV import

2025-02-18T11:07:58Z

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← Older revision		Revision as of 11:07, 18 February 2025
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	{{Algae-stub}}		{{Algae-stub}}
			<gallery>
			File:Laminaria_hyperborea.jpg\|Laminaria hyperborea
			File:Bladder_Wrack_(Fucus_vesiculosus)_-_geograph.org.uk_-_224125.jpg\|Bladder Wrack (Fucus vesiculosus)
			File:Capo_Gallo_Dicotoma.jpg\|Brown algae
			File:Laminaria_Life_Cycle.png\|Laminaria Life Cycle
			File:Fucus_conceptacle_XS3.jpg\|Fucus conceptacle
			File:Saccharina_latissima_NOAA.jpg\|Saccharina latissima
			</gallery>

Prab: CSV import

2024-03-03T14:19:31Z

CSV import

New page

'''Brown Algae''' is a large group of [[algae]] that are classified under the phylum '''Phaeophyceae'''. They are predominantly marine organisms and are known for their distinctive brown or olive-green color, which is a result of the presence of the pigment [[fucoxanthin]] in addition to [[chlorophyll]].

== Characteristics ==

Brown algae are multicellular and range in size from tiny filamentous forms to large complex structures. The largest species, such as the [[kelp]], can reach up to 50 meters in length. They possess a unique organ known as the [[holdfast]] which helps them anchor to the substrate.

== Life Cycle ==

The life cycle of brown algae is characterized by an alternation of generations. This involves a [[haploid]] phase, where the cells contain a single set of chromosomes, and a [[diploid]] phase, where the cells contain two sets of chromosomes.

== Ecology ==

Brown algae play a significant role in marine environments, particularly in [[coastal ecosystems]]. They provide food and shelter for a variety of marine organisms. Some species of brown algae are also of economic importance, used in food and as sources of [[alginates]], a thickening and stabilizing agent used in various industries.

== Classification ==

The classification of brown algae has been a subject of much debate. They are currently classified under the phylum Phaeophyceae, which is divided into several orders based on morphological characteristics.

== See Also ==

* [[Algae]]
* [[Kelp]]
* [[Fucoxanthin]]
* [[Chlorophyll]]
* [[Haploid]]
* [[Diploid]]
* [[Coastal ecosystems]]
* [[Alginates]]

[[Category:Algae]]
[[Category:Marine biology]]
[[Category:Phaeophyceae]]

{{Algae-stub}}

← Older revision		Revision as of 11:13, 18 February 2025
Line 37:		Line 37:
	File:Bladder_Wrack_(Fucus_vesiculosus)_-_geograph.org.uk_-_224125.jpg\|Bladder Wrack (Fucus vesiculosus)		File:Bladder_Wrack_(Fucus_vesiculosus)_-_geograph.org.uk_-_224125.jpg\|Bladder Wrack (Fucus vesiculosus)
	File:Capo_Gallo_Dicotoma.jpg\|Brown algae		File:Capo_Gallo_Dicotoma.jpg\|Brown algae
			File:Laminaria_Life_Cycle.png\|Laminaria Life Cycle
			File:Fucus_conceptacle_XS3.jpg\|Fucus conceptacle
			File:Saccharina_latissima_NOAA.jpg\|Saccharina latissima
			</gallery>
			<gallery>
			File:Kelp-forest-Monterey.jpg\|Kelp forest in Monterey
			File:Laminaria_hyperborea.jpg\|Laminaria hyperborea
			File:Bladder_Wrack_(Fucus_vesiculosus)_-_geograph.org.uk_-_224125.jpg\|Bladder Wrack (Fucus vesiculosus)
			File:Capo_Gallo_Dicotoma.jpg\|Capo Gallo Dicotoma
	File:Laminaria_Life_Cycle.png\|Laminaria Life Cycle		File:Laminaria_Life_Cycle.png\|Laminaria Life Cycle
	File:Fucus_conceptacle_XS3.jpg\|Fucus conceptacle		File:Fucus_conceptacle_XS3.jpg\|Fucus conceptacle
	File:Saccharina_latissima_NOAA.jpg\|Saccharina latissima		File:Saccharina_latissima_NOAA.jpg\|Saccharina latissima
	</gallery>		</gallery>