Reproduction and Development in Echinodermata and Prochordata (Record no. 70272)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 04242cam a2200397Ii 4500 |
| 001 - CONTROL NUMBER | |
| control field | 9780815364733 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 180706s2018 xx a o 000 0 eng d |
| 020 ## - INTERNATIONAL STANDARD BOOK NUMBER | |
| ISBN | 9780815364733 |
| -- | (e-book : PDF) |
| 020 ## - INTERNATIONAL STANDARD BOOK NUMBER | |
| ISBN | 9781351106900 |
| -- | (e-book: Mobi) |
| 020 ## - INTERNATIONAL STANDARD BOOK NUMBER | |
| -- | (hardback) |
| 100 1# - AUTHOR NAME | |
| Author | Pandian, T. J., |
| 245 10 - TITLE STATEMENT | |
| Title | Reproduction and Development in Echinodermata and Prochordata |
| 250 ## - EDITION STATEMENT | |
| Edition statement | First edition. |
| 300 ## - PHYSICAL DESCRIPTION | |
| Number of Pages | 1 online resource |
| 490 0# - SERIES STATEMENT | |
| Series statement | Reproduction and Development in Aquatic Invertebrates |
| 520 2# - SUMMARY, ETC. | |
| Summary, etc | "Echinoderms and prochordates occupy a key position in vertebrate evolution. The genomes of sea urchin share 70% homology with humans. Researches on cell cycle in sea urchin and phagocytosis in asteroids have fetched Nobel Prizes. In this context, this book assumes immense importance. Echinoderms are unique, as their symmetry is bilateral in larvae but pentamerous radial in adults. The latter has eliminated the development of an anterior head and bilateral appendages. Further, the obligate need to face the substratum for locomotion and acquisition of food has eliminated their planktonic and nektonic existence. Egg size, a decisive factor in recruitment, increases with decreasing depths up to 2,000-5,000 m in lecithotrophic asteroids and ophiuroids but remains constant in their planktotrophics. Smaller (< 18 mm) ophiuroids do not produce a lecithotrophic eggs but larger (> 110 mm) asteroids generate planktotrophic eggs only. Publications on sex ratio of echinoderms indicate the genetic determination of sex at fertilization but those on hybridization, karyotype and ploidy induction do not provide evidence for heterogametism. But the herbivorous echinoids and larvacea with their gonads harboring both germ cells and Nutritive Phagocytes (NPs) have economized the transportation and hormonal costs on gonadal function. Despite the amazing potential just 2 and 3% of echinoderms undergo clonal reproduction and regeneration, respectively. Fission is triggered, when adequate reserve nutrients are accumulated. It is the most prevalent mode of clonal reproduction in holothuroids, asteroids and ophiuroids. However, budding is a more prevalent mode of clonal reproduction in colonial hemichordates and urochordates. In echinoderms, fission and budding eliminate each other. Similarly, autoregulation of early development eliminates clonal reproduction in echinoids and solitary urochordates. In pterobranchs, thaliaceans and ascidians, the repeated and rapid budding leads to colonial formation. Coloniality imposes reductions in species number and body size, generation time and life span, gonad number and fecundity as well as switching from gonochorism to simultaneous hermaphorditism and oviparity to ovoviviparity/viviparity."--Provided by publisher. |
| 856 40 - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | https://www.taylorfrancis.com/books/9780815364733 |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | eBooks |
| 264 #1 - | |
| -- | Boca Raton, FL : |
| -- | CRC Press, |
| -- | 2018. |
| 336 ## - | |
| -- | text |
| -- | rdacontent |
| 337 ## - | |
| -- | computer |
| -- | rdamedia |
| 338 ## - | |
| -- | online resource |
| -- | rdacarrier |
| 650 04 - SUBJECT ADDED ENTRY--SUBJECT 1 | |
| -- | BIOSCIENCEnetBASE |
| 650 04 - SUBJECT ADDED ENTRY--SUBJECT 1 | |
| -- | LIFESCIENCEnetBASE |
| 650 04 - SUBJECT ADDED ENTRY--SUBJECT 1 | |
| -- | Oceanography |
| 650 04 - SUBJECT ADDED ENTRY--SUBJECT 1 | |
| -- | SCI-TECHnetBASE |
| 650 04 - SUBJECT ADDED ENTRY--SUBJECT 1 | |
| -- | STMnetBASE |
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