Reproduction and Development in Mollusca - T. J. Pandian

Reproduction and Development in Mollusca

(Autor)

Buch | Softcover
320 Seiten
2021
CRC Press (Verlag)
978-0-367-78206-1 (ISBN)
57,35 inkl. MwSt
Molluscs are comprised of edible abalones, snails, mussels, oysters, cuttlefish, and squids. With chapters focusing on sexual and asexual reproduction, aestivation, and how to determine sex, this book will be a valuable tool for marine biologists studying the endogenic biosynthesis and sexual differentiation of molluscans.
This book is perhaps the first attempt to comprehensively project the uniqueness of molluscs, covering almost all aspects of reproduction and development from aplacophorans to vampyromorphic cephalopods. Molluscs are unique for the presence of protective external shell, defensive inking, geographic distribution from the depth of 9,050 m to an altitude of 4,300 m, gamete diversity, the use of nurse eggs and embryos to accelerate the first few mitotic divisions in embryos, the natural occurrence of androgenics in a couple of bivalves, viable induced tetraploids, gigantism induced by elevated ploidy, the complementary role played by mitochondrial genome in sex determination by nuclear genes and the uptake and accumulation of steroid hormone from surrounding waters. In molluscs, sexuality comprises of gonochorism (< 75 %) and hermaphroditism, which itself includes simultaneous (> 24%), protandry (< 1 %), Marian and serial. In them, the presence of shell affords iteroparity and relatively longer life span in prosobranchs and bivalves but its absence semelparity and short life span in opisthobranchs and cephalopods. Within semelparity, gonochorism facilitates faster growth and larger body size but hermaphroditism small body size. In them, sex is irrevocably determined at fertilization by a few unknown genes and is not amenable to any environmental influence. However, the sex determining mechanism is more a family trait in bivalves. Primary sex differentiation is also fixed and not amenable to environmental factor but secondary differentiation is labile, protracted and amenable to environmental factors. Both sex differentiation and reproductive cycle are accomplished and controlled solely by neurohormones. In these processes, the role of steroid hormones may be alien to molluscs.

T.J. Pandian: Visiting Professor, CAS Marine Biology, Annamalai University, Tamil Nadu, India.

Introduction. Shell and reproduction. Sexual reproduction. Regeneration and asexual reproduction. Aestivation. Sex determination. Sex differentiation. Ocean acidification. Uniqueness of molluscs. References.

Erscheinungsdatum
Reihe/Serie Reproduction and Development in Aquatic Invertebrates
Verlagsort London
Sprache englisch
Maße 156 x 234 mm
Gewicht 435 g
Themenwelt Naturwissenschaften Biologie Genetik / Molekularbiologie
Naturwissenschaften Biologie Limnologie / Meeresbiologie
Naturwissenschaften Biologie Zoologie
ISBN-10 0-367-78206-5 / 0367782065
ISBN-13 978-0-367-78206-1 / 9780367782061
Zustand Neuware
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