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portada Reproduction and Development in Annelida: Series on: Reproduction and Development in Aquatic Invertebrates
Type
Physical Book
Publisher
Author
Language
English
Pages
278
Format
Paperback
ISBN13
9780367780326
Edition No.
1

Reproduction and Development in Annelida: Series on: Reproduction and Development in Aquatic Invertebrates

T. J. Pandian (Author) · Crc Press · Paperback

Reproduction and Development in Annelida: Series on: Reproduction and Development in Aquatic Invertebrates - T. J. Pandian

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Synopsis "Reproduction and Development in Annelida: Series on: Reproduction and Development in Aquatic Invertebrates "

This book is a concise informative elucidation of all aspects of reproduction and development in annelids covering from arenicola to tubifex. Annelids flourish between 4,900 m depth to 2,000 m altitude; some of them occur in unusual habitats like hydrothermal vents and subterranean aquatic system (stigobionts). A few have no gut and acquire adequate nutrients through osmotrophism and/or engaging symbiotic microbes. In the absence of exoskeleton to escape predation, the 17,000 speciose annelids have explored bewildering modes of reproduction; not surprisingly, 42-47% of them are brooders. With 13,000 species, polychaetes are gonochores but some 207 species of them are hermaphrodites. Clitellates are all hermaphrodites; of them, 76 species are parthenogens, of which 56 are earthworms.Regenerative potency of annelids ranges from an organ to an entire worm from a single 'seminal' segment. The head, tail and both together can be regenerated 21, 42 and 20 times, respectively. However, the potency is limited to 1% of polychaetes and Heterogamatic sex determination is reported to occur only in six polychaete species, although karyotype is known for 83 annelid species. In temperate polychaetes, a dozen neuroendocrines, arising mostly from the 'brain' regulates reproductive cycle. A complete chapter devoted to vermiculture, (i) recognizes the fast-growing candidate species, (ii) distinguishes 'layers' from 'brooders', (iii) indicates that the harvest of oligochaetes may reduce the input of nitrogenous fertilizer in the ricefield, and (iv) explores the scope for increasing wealth from waste.

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