3.3.2 Cell Migration3.3.3 Blastema and Differentiation; 3.3.4 Segmentation and Reorganization; 3.4 Anterior vs Posterior; Chapter 4. Asexual Reproduction; Introduction; 4.1 Obligate Cloners?; 4.2 Incidence and Prevalence; 4.3 Observations and Characteristics; 4.4 Architomy; 4.5 Naidu's Monograph; 4.6 Paratomy; 4.7 Restoration of Sexual Reproduction; 4.8 Clonal Stem Cells; Chapter 5. Epitoky; Introduction; 5.1 Types and Characteristics; 5.2 Epigamy; 5.3 Schizogamy; 5.4 Vertical Migration; 5.5 Swarming Phenomenon; 5.6 Pheromones and Spawning; Chapter 6. Sex Determination; Introduction
متن يادداشت
6.1 Karyotype and Heterogamety6.2 Gametic Compatibility; 6.3 Sex Ratio and Variations; Chapter 7. Sex Differentiation; Introduction; 7.1 Endocrine Regulation; 7.1.1 Nereidids; 7.1.2 Nephtyids; 7.1.3 Phyllodocids; 7.1.4 Arenicolids; 7.2 Differentiation and Lability; 7.2.1 Dorvilleids; 7.2.2 Syllids; 7.3 Pollutants and Reproduction; 7.4 Vectors and Borers; Chapter 8. Vermiculture; Introduction; 8.1 Characteristics and Features; 8.2 Candidate Species; 8.2.1 Growth; 8.2.2 Reproduction; 8.2.3 Polyploids and Parthenogens; Chapter 9. Summary and New Findings; Chapter 10 . References; Author Index
متن يادداشت
Species IndexSubject Index; Author's Biography
بدون عنوان
0
بدون عنوان
8
بدون عنوان
8
بدون عنوان
8
بدون عنوان
8
یادداشتهای مربوط به خلاصه یا چکیده
متن يادداشت
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 <2% of oligochaetes. In oligochaetes, the chloragogue temporally separates regeneration and reproduction but sedentary polychaetes undertake them together at the reduced reproductive output. Only 79 polychaete and 111 oligochaete species have the potency for clonal reproduction. Within families, the potency ranges from 2% in spionids to 54% in naidids. Epitoky, a spectacular and unique phenomenon, involves the transformation from benthic to meroplanktonic reproductive morphism. It occurs in 106 errant polychaete species. The larger glycerides, nereidids and eunicids use muscular energy to climb <50 m vertical distance. But the small phyllodocids and cteniodrilids may reduce buoyancy to climb 1,000-4,000 m vertical distance. 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.
یادداشتهای مربوط به سفارشات
منبع سفارش / آدرس اشتراک
Ingram Content Group
شماره انبار
9780429582585
ویراست دیگر از اثر در قالب دیگر رسانه
شماره استاندارد بين المللي کتاب و موسيقي
9780367187453
موضوع (اسم عام یاعبارت اسمی عام)
موضوع مستند نشده
Annelida-- Development.
موضوع مستند نشده
Annelida-- Reproduction.
موضوع مستند نشده
MEDICAL-- Veterinary Medicine-- General.
موضوع مستند نشده
NATURE-- Animals.
موضوع مستند نشده
SCIENCE-- Life Sciences-- Biology-- Marine Biology.
موضوع مستند نشده
SCIENCE-- Life Sciences-- Zoology-- Invertebrates.
مقوله موضوعی
موضوع مستند نشده
MED-- 089000
موضوع مستند نشده
NAT-- 001000
موضوع مستند نشده
RBKC
موضوع مستند نشده
SCI-- 039000
موضوع مستند نشده
SCI-- 070020
رده بندی ديویی
شماره
592/
.
6
ويراست
23
رده بندی کنگره
شماره رده
QL391
.
A6
نشانه اثر
P35
2019
نام شخص به منزله سر شناسه - (مسئولیت معنوی درجه اول )