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| 001 | 9781003057512 | ||
| 003 | FlBoTFG | ||
| 005 | 20220711212101.0 | ||
| 006 | m o d | ||
| 007 | cr ||||||||||| | ||
| 008 | 201006s2020 flua o 000 0 eng d | ||
| 040 |
_aOCoLC-P _beng _erda _epn _cOCoLC-P |
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| 020 |
_a9781000284584 _q(ePub ebook) |
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| 020 | _a1000284581 | ||
| 020 | _a1000284549 | ||
| 020 |
_a9781000284560 _q(Mobipocket ebook) |
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| 020 | _a1000284565 | ||
| 020 |
_a9781003057512 _q(ebook) |
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| 020 | _a1003057519 | ||
| 020 |
_a9781000284546 _q(electronic bk.) |
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| 020 | _z9780367523350 (hbk.) | ||
| 024 | 7 |
_a10.1201/9781003057512 _2doi |
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| 035 | _a(OCoLC)1202997066 | ||
| 035 | _a(OCoLC-P)1202997066 | ||
| 050 | 4 | _aQL364.15 | |
| 072 | 7 |
_aSCI _x039000 _2bisacsh |
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| 072 | 7 |
_aSCI _x072000 _2bisacsh |
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| 072 | 7 |
_aNAT _x001000 _2bisacsh |
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| 072 | 7 |
_aPSC _2bicssc |
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| 082 | 0 | 4 |
_a592 _223 |
| 100 | 1 |
_aPandian, T. J., _eauthor. _912976 |
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| 245 | 1 | 0 |
_aReproduction and development in minor phyla / _cT.J. Pandian. |
| 264 | 1 |
_aBoca Raton : _bCRC Press, _c2020. |
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| 300 |
_a1 online resource : _billustrations (black and white). |
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| 336 |
_atext _2rdacontent |
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_astill image _2rdacontent |
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| 337 |
_acomputer _2rdamedia |
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| 338 |
_aonline resource _2rdacarrier |
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| 490 | 0 | _aReproduction and development in aquatic invertebrates | |
| 520 | _aThe 26 recognized minor phyla comprise aberrant clades, as most of them terminate as blind offshoots. Untied from the discussion on their phylogenesis of minor phyla, this book is largely devoted, for the first time, to aspects of reproduction and development in minor phyletics. The minor phyla are not as speciose (1,795 species/phylum) as the major phyla (157,066 species/phylum) are. The accumulation of deleterious genes causes inbreeding depression among progenies arising from parthenogenesis, clonal multiplication and selfing hermaphrodites. The reason for the limited species diversity in minor phyla is traced to (i) eutelism in 65.7% of minor phyletics and (ii) existence of 21.6% clonals, (iii) 6.4% parthenogens and (iv) 1.2% selfing hermaphroditism. Gonochorism obligately requires motility to search for a mate. The combination of low motility and gonochorism from Placozoa to hemocoelomatic minor phyla has limited diversity to < 1,000 species. Over 19% of minor phyletics are hermaphrodites. With the need to manifest and maintain dual sexuality, fecundity of hermaphrodites may be reduced to 50% of that in gonochores. Adopting an array of strategies, < 100 hermaphrodites are selfers. In eutelics, mitotic division is ceased in somatic cells after hatching. For the first time, the prevalence of eutelism has been brought to light in numbers of all the six pseudocoelomate phyla and priapulids. Eutelism limits fecundity to 30-300 eggs in free-living pseudocoelomates, priapulids and possibly other hemocoelomates. In them, sperm production is less than that of egg production; as a result, a large fraction of their eggs is sterile. With a high proportion of non-eutelic gametic cells (35%), Nematoda and possibly Nematomorpha and Acanthocephala are more fecund than rotifers, in which the proportion is 15%. Briefly, the reasons for the limited species diversity in minor phyletics are traced to eutelism, parthenogenesis and clonal multiplication. Surprisingly, parthenogenesis and clonal multiplication mutually eliminate each other. This is also true of hermaphroditism and parthenogenesis. However, clonal multiplication is prevalent from structurally simplest Placozoa to the most complex Ascidiacea, except in pseudocoelomates and hemocoelomates. A limited number of cells and cell types, and the consequent structural simplicity facilitate manifestation of parthenogenesis in pseudocoelomates and parasitism in Mesozoa, Myxozoa, 59% of Nematoda, Nematomorpha, Acanthocephala and Pentastomida. Despite hermaphroditism, Bryozoa (5,700 species) and Ascidiacea (3,000 species) are speciose among minor phyla. For the first time, the importance of fusion of fragments or colonies - an event equivalent to gamete fusion at fertilization - is recognized as a source of new gene combination. Besides, the colonies in these minor phyla degenerate and regenerate more or less regularly. Only the fittest degenerated colonies may be rejuvenated and regenerated. | ||
| 588 | _aOCLC-licensed vendor bibliographic record. | ||
| 650 | 0 |
_aInvertebrates _xReproduction. _912977 |
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| 650 | 0 |
_aInvertebrates _xDevelopment. _912978 |
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| 650 | 7 |
_aSCIENCE / Life Sciences / Biology / Marine Biology _2bisacsh _912979 |
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| 650 | 7 |
_aSCIENCE / Life Sciences / Biology / Developmental Biology _2bisacsh _912980 |
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| 650 | 7 |
_aNATURE / Animals _2bisacsh _912001 |
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| 856 | 4 | 0 |
_3Taylor & Francis _uhttps://www.taylorfrancis.com/books/9781003057512 |
| 856 | 4 | 2 |
_3OCLC metadata license agreement _uhttp://www.oclc.org/content/dam/oclc/forms/terms/vbrl-201703.pdf |
| 942 | _cEBK | ||
| 999 |
_c70338 _d70338 |
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