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Books > Science & Mathematics > Biology, life sciences > Developmental biology
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Reproduction and Development in Mollusca (Paperback)
Loot Price: R1,447
Discovery Miles 14 470
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Reproduction and Development in Mollusca (Paperback)
Series: Reproduction and Development in Aquatic Invertebrates
Expected to ship within 12 - 17 working days
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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.
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