New PDF release: A Textbook on Algae

By H. D. Kumar, H. N. Singh (auth.)

ISBN-10: 0333260724

ISBN-13: 9780333260722

ISBN-10: 1349161446

ISBN-13: 9781349161447

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Extra resources for A Textbook on Algae

Example text

Likewise, hens fed with seaweed meal produce eggs rieh in iodine. The primary producers in aquatic habitats, incIuding the sea, are mainly algae and therefore algal metaboJism and productivity has a great bearing on the natural flora and fauna of the aquatic ecosystem. Nitrogenfixing blue-green algae maintain and regulate the nitrogen budget of aquatic habitats, and by excretion of fixed nitrogen into the surrounding water, aid the growth of other microorganisms in places where nitrogen is a limiting factor (Stewart, 1967).

True sexuality has been established for most members of the Chlorophyta, Phaeophyta and Rhodophyta and for some members of the Xanthophyta, Bacillariophyta, Pyrrophyta and Chrysophyta. In the Cyanophyta, true sexuality in the sense of karyogamy and meiosis is lacking but a parasexual phenomenon involving recombination of genes in a single line of des cent from two genetically distinct parents has been reported in three REPRODUCTION AND PERENNA TION 29 different genera-Anacystis, Cylindrospermum and Anabaena.

The gametes produced in antheridia are the ├čagellated, motile antherozoids (or spermatozoids), whereas the gamete produced in the oogonium is the non-motile, non-├čagellated egg or ovum. In Rhodophyta the oogonium having a swollen base (containing the egg) and asiender projecting neck, the trichogyne, is called a carpogonium, and the non-motile, non-f1agellate male gamete is termed spermatium, the structure producing it being known as a spermatangium. True sexuality has been established for most members of the Chlorophyta, Phaeophyta and Rhodophyta and for some members of the Xanthophyta, Bacillariophyta, Pyrrophyta and Chrysophyta.

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A Textbook on Algae by H. D. Kumar, H. N. Singh (auth.)


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New PDF release: A Textbook on Algae
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