► Description:
شرح |
■
درباره این کتاب:
Table
of contents :
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.
■ در این کتاب چه
میخوانیم:
Introduction
-- Molluscan Science -- Taxonomy and
Distribution -- Thermal Vents and Cold
Seeps -- Energy Budgets -- Life Span and
Generation Time -- Spermatogenesis and
Fertilization -- Ontogenetic Development
-- Locomotion and Dispersal -- Molluscan
Fisheries -- Shell and Reproduction --
Structure and Diversity -- Latitudes,
Predators and Parasites -- Shell and
Resource Allocation -- Symmetry and
Sinistrals -- Chemical Defense -- Sexual
Reproduction -- Reproductive Systems --
Gonochorism -- Pathenogenesis --
Hermaphroditism -- Mates and Mating
Systems -- Alternative Mating System (AMS)
-- Multiple Paternity -- Encapsulation and
Nurse Eggs -- Poecilogony and Dispersal
Dimorphism -- Brood Protection and
Viviparity -- Fecundity -- Regeneration
and Asexual Reproduction -- Gastropods --
Clio pyrimidata -- Aestivation -- Seasonal
Aestivation -- Tidal Aestivation --
Biological Weapon -- Sex Determination --
Inheritance of Color and Symmetry --
Karyotypes and Heterogametism -- Spawning
Induction and Cryopreservation -- Ploidy
Induction and Gigantism -- Mitochondrial
Genome -- Sex Determination Models -- Sex
Differentiation -- Neuroendocrines --
Steroid Hormones -- Endocrines Disruption
-- Parasitic Disruption -- Ocean
Acidification -- Chemistry of Seawater --
Pelagic Molluscs -- Benthic Molluscs --
Persistent Carry-over Effects -- Effects
on Prey-Predators -- Uniqueness of
Molluscs -- Shell and Iteroparity --
Gamete Diversity -- Gigantism and
Polyploidy -- Sexuality and Paternity --
Double Uniparental Inheritance (DUI) --
Vertebrate Type Steroids -- Aestivation vs
Cysts --
◄ مطالعه
این کتاب برای کلیه علاقمندان زیست شناسی
دریا و آبهای داخلی برای نوشتن مقاله و
پایان نامه مفید است.
|