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Books > Science & Mathematics > Biology, life sciences > Zoology & animal sciences > Invertebrates

The Dancing Bees - Karl von Frisch and the Discovery of the Honeybee Language (Paperback): Tania Munz The Dancing Bees - Karl von Frisch and the Discovery of the Honeybee Language (Paperback)
Tania Munz
R641 Discovery Miles 6 410 Ships in 9 - 15 working days

We think of bees as being among the busiest workers in the garden, admiring them for their productivity. But amid their buzzing, they are also great communicators and unusual dancers. As Karl von Frisch (1886-1982) discovered during World War II, bees communicate the location of food sources to each other through complex circle and waggle dances. For centuries, beekeepers had observed these curious movements in hives, and others had speculated about the possibility of a bee language used to manage the work of the hive. But it took von Frisch to determine that the bees' dances communicated precise information about the distance and direction of food sources. As Tania Munz shows in this exploration of von Frisch's life and research, this important discovery came amid the tense circumstances of the Third Reich.The Dancing Bees draws on previously unexplored archival sources in order to reveal von Frisch's full story, including how the Nazi government in 1940 determined that he was one-quarter Jewish, revoked his teaching privileges, and sought to prevent him from working altogether until circumstances intervened. In the 1940s, bee populations throughout Europe were facing the devastating effects of a plague (just as they are today), and because the bees were essential to the pollination of crops, von Frisch's research was deemed critical to maintaining the food supply of a nation at war. The bees, as von Frisch put it years later, saved his life. Munz not only explores von Frisch's complicated career in the Third Reich, she looks closely at the legacy of his work and the later debates about the significance of the bee language and the science of animal communication. This first in-depth biography of von Frisch paints a complex and nuanced portrait of a scientist at work under Nazi rule. The Dancing Bees will be welcomed by anyone seeking to better understand not only this chapter of the history of science but also the peculiar waggles of our garden visitors.

Climate Change and Animal Health (Hardcover): Craig Stephen, Colleen Duncan Climate Change and Animal Health (Hardcover)
Craig Stephen, Colleen Duncan
R4,029 Discovery Miles 40 290 Ships in 12 - 17 working days

DIRECTLY APPLIES TO LIFE ON LAND SDG and CLIMATE CHANGE SDG. International organizations such as the Intergovernmental Panel on Climate Change (IPPC), World Health Organization, Food and Agriculture Organization and World Organization for Animal Health have all reminded us that health impacts of climate change will become some of societies' greatest challenges. How we respond or adapt to climate change will have profound implications for people, animals, biodiversity, economies and ecosystems today as well as in the future. The book provides, in one easy reference, all of the information Animal Health practitioners need from defining the climate change concept, providing science-based evidence of climate change degradation of animal (ecosystem) health and successful mitigation and reversal strategies. Despite being arguably the most important challenges of the 21st century, engagement, and leadership from the animal health sector on climate change remains hard to find. This book attempts to support animal health professionals by providing information, knowledge, and experiences they can use to remedy this situation. There is no other book that covers anything like the proposed subject matter to this level of completeness and detail. The publishing of a text of this nature could help erode the power of the climate denialism lobby, shifting the debate and allowing mitigation efforts to gain higher priority. The tone of the book has an understated sense of urgency, leaning slightly toward presenting as a 'Manual for the apocalypse'. This has potential to be a benchmark publication. The text not only defines climate change but takes a proactive approach with intervention and corrective action examples: each chapter ends with suggestions on teachable and actionable ideas that could be used to mobilize concepts and information provided into education or advocacy. In this way, the book not only brings key ideas, principles and information to understand the implications for climate change for animal health, but will help translate the book's offerings into education and intervention. Teachers and researchers could use this one-of-a-kind book to frame a course or seminar series heightening student career engagement and stewardship of a more sustainable and healthier planet.

Insect Virology (Hardcover): Sassan Asgari, Karyn N. Johnson Insect Virology (Hardcover)
Sassan Asgari, Karyn N. Johnson
R5,775 Discovery Miles 57 750 Ships in 10 - 15 working days

Viruses that are pathogenic to beneficial insects and other arthropods cause millions of dollars of damage every year to industries, such as sericulture, apiculture, and aquaculture (e.g. infecting honeybees and silk worms). On the other hand, viruses that are pathogenic to insect pests can be exploited as attractive biological control agents. Another fascinating feature of these viruses is that some, e.g. baculoviruses, have been commercially exploited for use as gene expression and delivery vectors in both insect and mammalian cells. All of these factors have led to an explosion in the amount of research into insect viruses in recent years, generating impressive quantities of information on the molecular and cellular biology of these viruses. This timely book reviews the exciting new developments in the field of insect virology. Written by internationally renowned insect virologists, the chapters review the current molecular biology of all the major groups of insect pathogenic viruse

The Darkling Beetles of the Sinai Peninsula - Coleoptera: Tenebrionidae (Hardcover): Martin Lillig, Tomas Pavlicek The Darkling Beetles of the Sinai Peninsula - Coleoptera: Tenebrionidae (Hardcover)
Martin Lillig, Tomas Pavlicek
R3,282 Discovery Miles 32 820 Ships in 12 - 17 working days

This book as been requested by a number of researchers since the original supplement was published in 2003. There is increasing demand for it. The book contains an identification key and colour plates of the species known from the Sinai Peninsula. Darkling beetles serve as a model group for a wide range of research, e.g. in faunistics, biogeography, phylogeography, and taxonomy. They are of the interest of the active and future researchers and amateurs. Many potential readers in the Middle East countries deal with biogeography and bionomics of Tenebrionidae as a model group. One researcher said "There is an absolute gap in the market concerning professional books dealing with the beetles of the family Tenebrionidae" As well as being a valuable taxonomic reference, the book can be used on the following course/modules: biogeography, desert life, ecology of insects, local faunas of insects.

Echinoidea - with bilateral symmetry. Irregularia (Hardcover): Heinke A G Schultz Echinoidea - with bilateral symmetry. Irregularia (Hardcover)
Heinke A G Schultz
R9,097 Discovery Miles 90 970 Ships in 12 - 17 working days

This book is the second volume of two books about sea urchins (echinoids) since 1953 (Th. Mortensen). The detailed and coloured illustrated descriptions enable the reader to identify all species living today in our oceans. Recent scientific searchings are included. Volume II. describes the Irregularia with bilateral symmetry, including the well known "sand dollars" and "heart urchins", living mostly more or less deeply burrowed in the substrat.

Species Problems and Beyond - Contemporary Issues in Philosophy and Practice (Hardcover): John S. Wilkins, Frank E. Zachos,... Species Problems and Beyond - Contemporary Issues in Philosophy and Practice (Hardcover)
John S. Wilkins, Frank E. Zachos, Igor Ya. Pavlinov
R5,320 Discovery Miles 53 200 Ships in 12 - 17 working days

Key Features A timely book for a still pressing problem Contributions by many of the leading figures in the debate. Summarizes the many new contributions to the field of recent years. For the use of upper level seminars and courses A dialogue format will generate further discussion

The Goddard Guide to Arthropods of Medical Importance (Paperback, 7th edition): Gail Miriam Moraru, Jerome Goddard II The Goddard Guide to Arthropods of Medical Importance (Paperback, 7th edition)
Gail Miriam Moraru, Jerome Goddard II
R1,516 Discovery Miles 15 160 Ships in 9 - 15 working days

Covering all major arthropods of medical importance worldwide, this award-winning resource has established itself as a standard reference for almost 25 years. With the globilization of commerce and the world becoming more intimately connected through the everyday ease of travel, unknown arthropod species are being increasingly encountered. This means access to up-to-date, authoritative information in medical entomology has never been more important. Now in its seventh edition, this book maintains its well-acclaimed status as the ultimate easy-to-use guide to identify disease-carrying arthropods, the common signs and symptoms of vector-borne diseases, and the current recommended procedures for treatment. Includes an in-depth chapter with diagnostic aids to help physicians to recognize and accurately diagnose arthropod-related diseases and conditions more easily Updates all chapters with the latest medical and scientific findings, including Zika virus, red meat allergy, new viruses found in ticks, and vaccine development for malaria and dengue fever Presents a greater medical parasitology emphasis throughout Offers electronic downloads containing additional photographs of arthropod-caused diseases and lesions, as well as instructional videos with pest identification aids, basic entomology, and insect and pest ecology. Illustrated throughout with detailed color images to aid identification, The Goddard Guide to Arthropods of Medical Importance, Seventh Edition will remain an essential guide for physicians, public health officials, and pest control professionals.

Public Health Entomology (Hardcover, 2nd edition): Jerome Goddard Public Health Entomology (Hardcover, 2nd edition)
Jerome Goddard
R4,651 Discovery Miles 46 510 Ships in 9 - 15 working days

1) The first and only textbook solely about public health entomology, mapping onto new Certificate in Public Health Entomology courses in the U.S. Half the price of the nearest competitors, with the subject of Public Health Entomology rapidly becoming a hot topic in public health, this should be adopted as the "go-to" text for public health entomology. 2) Discusses the rationale for having public health entomology programs in state and federal health agencies. 3) Shows how to set up a public health program from scratch. 4) Compares and contrasts specific duties of a public health entomologist (and what are NOT the duties). 5) Includes a section about the primary public health arthropod vectors, their biology, distribution, disease potential, and control.

Reproductive Strategies in Insects (Hardcover): Omkar, Geetanjali Mishra Reproductive Strategies in Insects (Hardcover)
Omkar, Geetanjali Mishra
R3,315 Discovery Miles 33 150 Ships in 12 - 17 working days

Reproduction is one of the most inherent tasks that all living organisms are actively involved in. It forms the backbone of their existence with all evolutionary energies directed over billion years of creation into maximizing reproductive effort. For so simple and directed a need such as maximizing reproduction, it is interesting to see how much diversity and complexity exists in this task. Each organism despite having the same end goal employs different strategies. The complexities, intricacies and strategies of successful reproduction while being extremely fascinating are equally befuddling. Reproductive Strategies in Insects provides an expansive critical look at the reproductive strategies of the most diverse group of animals, the insects. Insects which inhabit myriad niches in all ecosystems except the oceans, show the most diverse reproductive strategies ranging from simplest to most complex. Reproductive strategies, viz., search for mates, number of mates, display of mate quality, assessment of mate quality, acceptance of mate, rejection of mates, forced copulations, the fight for paternity pre, during and post copula, the modulation of paternity, ovipositional strategies and parental care are described in detail in this book. Also, each strategy in analyzed in relation to its morphological, physiological, ethological, ecological and evolutionary aspects. Features: Covers a wide variety of reproductive strategies, A detailed step by step description of reproductive strategies. Discusses morphological, physiological, ethological, ecological and evolutionary aspects. Modulation of these strategies and responsible modulatory factors are also discussed. Well-illustrated. Recent research results and probable future research directions. This is a niche reference book for ethologists, biologists studying behavioural evolution and entomologists. It may also be used as a textbook for a graduate level course in behaviour.

All the Insects in the World (Hardcover): David Opie All the Insects in the World (Hardcover)
David Opie; Illustrated by David Opie
R461 R414 Discovery Miles 4 140 Save R47 (10%) Ships in 10 - 15 working days
Advances in Pest Management in Commercial Flowers (Paperback): Suprakash Pal, Akshay Kumar Chakravarthy Advances in Pest Management in Commercial Flowers (Paperback)
Suprakash Pal, Akshay Kumar Chakravarthy
R2,514 Discovery Miles 25 140 Ships in 12 - 17 working days

Floricultural crops all over the world are challenged by a number of insect and mite pests. The pest scenario is changing, and with climate change the instances of new pest incidences have become a more common problem. Like other crops, the intensive cultivation of commercial flowers has accentuated pest problems, as farmers tend to use more agricultural chemicals, which, in turn, increase the problems of pesticide resistance, pest resurgence, and residues leading to health hazards. This volume, Advances in Pest Management in Commercial Flowers, looks at the major challenges and improvements in this growing area today. It first provides an informative overview of worldwide pests of important commercial flowers. It explores a number of important issues in this area, such as the role of climate change on insect pests of commercial flowers and the synthetic chemicals and their possible harmful effects on the environment.

Moths - A Complete Guide to Biology and Behavior (Paperback): David Lees, Alberto Zilli Moths - A Complete Guide to Biology and Behavior (Paperback)
David Lees, Alberto Zilli
R682 R625 Discovery Miles 6 250 Save R57 (8%) Ships in 10 - 15 working days
Taxonomic Nomenclature - What's in a Name - Theory and History (Hardcover): Igor Ya. Pavlinov Taxonomic Nomenclature - What's in a Name - Theory and History (Hardcover)
Igor Ya. Pavlinov
R3,135 Discovery Miles 31 350 Ships in 12 - 17 working days

This book suggests an in-depth look at nomenclature in systematics instead of providing another "instruction for use" of various Codes of nomenclature. The focus is on ideas of what taxonomic nomenclature is as a part of the professional language of systematics considered in its full historical and conceptual scope. Basic concepts of nomenclature are outlined, and their development characterized; a hierarchy of fundamental principles of nomenclature are summarized; and the relationship between taxonomic nomenclature and taxonomic theory discussed. This book is addressed to those who would like to go beyond the boundaries of existing Codes to look at the subject from a more general, mostly theoretical standpoint. Key Features * Provides a review of the role of nomenclature in systematics * Reviews the conceptual scope and historical contexts of nomenclature * Analyzes fundamental principles of nomenclature * Outlines the historical development of nomenclature * Reviews the rules of nomenclature in botany, zoology, microbiology, and horticulture Related Titles Mishler, B. D. What, If Anything, Are Species? (ISBN 978-1-4987-1454-9) Pavlinov. I. Ya. Biological Systematics: History and Theory (ISBN 978-0-367-65445-0) Rieppel, O. Phylogenetic Systematics: Haeckel to Hennig (ISBN 978-0-367-87645-6) Wilkins, J. S. Species: The Evolution of an Idea, 2nd ed. (ISBN 978-0-367-65736-9)

A Monograph on Whiteflies (Hardcover): N.S. Butter, A. K Dhawan A Monograph on Whiteflies (Hardcover)
N.S. Butter, A. K Dhawan
R3,919 R3,151 Discovery Miles 31 510 Save R768 (20%) Ships in 12 - 17 working days

Whiteflies, taxonomy biotypes. Management on whitefly. Whiteflies - vector of viruses. Whitefly - Plant Relationship. Responsible for crop failures throughout the globe. Whitefly in Agricultural System. Developed resistance to pesticides with the resurgence.

Key Questions in Urban Pest Management - A Study and Revision Guide (Paperback): Partho Dhang, Philip Koehler, Roberto Pereira,... Key Questions in Urban Pest Management - A Study and Revision Guide (Paperback)
Partho Dhang, Philip Koehler, Roberto Pereira, Daniel Dye II
R667 Discovery Miles 6 670 Ships in 9 - 15 working days

Urban pests are common all over the world. These include cockroaches, flies, mosquitoes, bed bugs, ticks, fleas, ants, termites, rodents and others. These pests thrive in human structures, where there is food, warmth and places to hide. Urban pests are one of the leading causes of illnesses in humans due to allergies, bites, food contamination and phobias. They can also cause significant damage to property and structures. Knowledge and training in this field is vital for professional and trainee pest managers. This book is specifically intended to provide an aid to such candidates. The book contains 500 multiple-choice questions (and answers) grouped into the following major topic areas: * The history of urban entomology * Household pests * Cockroaches * Flies * Mosquitoes * Bed bugs * Termites * Sporadic pests * Stored product pests * Vertebrate pests * Pesticides and pesticide formulations * Handling pesticides * Integrated Pest Control Produced in a convenient format that can be used at any time in any place, the book allows the reader to learn and revise the subject and much more. Its structure allows the study of one topic area at a time, progressing through a simple introduction followed by key revision questions, many of which require students to use their practical knowledge. The answers to each of the questions are provided at the end with short explanations wherever appropriate.

The Insect & Spider Collections of the World (Paperback, 2nd edition): G. Allan Samuelson, Gordon M Nishida, Ross H. Arnett Jr The Insect & Spider Collections of the World (Paperback, 2nd edition)
G. Allan Samuelson, Gordon M Nishida, Ross H. Arnett Jr
R1,738 Discovery Miles 17 380 Ships in 12 - 17 working days

First published in 1993, completely rewritten, this second edition includes a list of all 210 countries of the world and all of the islands, with comments on the existence of insect and spider collections, both public and private. These listings are arranged alphabetically by country, state/province, and city, with private collections listed under the public collection with which they are registered. Part II of the directory is an alphabetical list of the codes assigned to each of the collections described in Part I. This list is also cross-referenced to variations of the codes used in other works, which will eliminate any confusion over this duplication. This classic work provides a ready reference to all collections and is required by all insect and spider systematists.

Biology and Evolution of the Mollusca, Volume 2 (Paperback): David R Lindberg, Winston Frank Ponder, Juliet Mary Ponder Biology and Evolution of the Mollusca, Volume 2 (Paperback)
David R Lindberg, Winston Frank Ponder, Juliet Mary Ponder
R1,613 Discovery Miles 16 130 Ships in 12 - 17 working days

This volume provides individual treatments of the major molluscan taxa. Each chapter provides an overview of the evolution, phylogeny and classification of a group of molluscs, as well as more specific and detailed coverage of their biology (reproduction, feeding and digestion, excretion, respiration etc.), their long fossil record and aspects of their natural history. The book is illustrated with hundreds of colour figures. In both volumes, concepts are summarised in colour-coded illustrations. Key selling features: Comprehensively reviews molluscan biology and evolutionary history Includes a description the anatomy and physiology of anatomical systems Up to date treatment with a comprehensive bibliography Reviews the phylogenetic history of the major molluscan lineages

Reproduction and Development in Platyhelminthes (Paperback): T. J Pandian Reproduction and Development in Platyhelminthes (Paperback)
T. J Pandian
R1,508 Discovery Miles 15 080 Ships in 12 - 17 working days

This book is a comprehensive elucidation on aspects of reproduction and development in platyhelminthes covering from acoelids to taeniids. With the unique presence of neoblasts, turbellarians serve as a model for studies on cancer and senescence. Of ~ 27,000 species, ~ 77% are parasites; they are harmful to man and his food basket from livestock and fish. The stress hormone, cortisol level is responsible for susceptibility and resistance of the host. In digeneans, the propagatory multiplication potency is retained by all the larval forms and in either direction in sporocyst. The higher clonal diversity, mixing and selection in Second Intermediate Host (SIH) may purge inbreeding depression suffered by the fluke on propagatory multiplication in First Intermediate Host (FIH). Of 12,012 digeneans, 88% may engage 33,014 potential SIH species. They have the choice to select one among the available/awaiting 3.5 host species. The motility of vertebrate host and euryxenic flexibility/scope for selection of SIH species has increased lineage diversification in digeneans. The life cycle of cestodes is divided into aquatic and terrestrial patterns. The former includes (i) oncosphere and (ii) coracidium types and the latter (iii) hexacanth-cysticercoid, (iv) hexacanth-tetrathyridium and (v) hexacanth-cysticercus types. The share for the oncosphere, coracidium and hexacanth types is 17.0, 29.5 and 46.5%, respectively. The staggering fecundity and adoption of the intermediate host in the herbivorous/insectivorous food chain have enriched Taenioidea as the most (2,264) speciose order. Sex specific genes Smed-dmd 1 and macbol have been identified, and neuropeptides and dipeptides are involved in sexualization. Trematodes are unable to parasitize elasmobranchs, as they cannot suck body fluid/blood containing a high level of urea. Relatively higher fecundity supplemented with propagatory multiplication, incorporation of SIH in 88% species, clonal selection in SIH, and euryxenic flexibility and the widest choice for selection of SIH have led to the highest lineage diversification to render digeneans as the most speciose order in Platyhelminthes.

Biological Control - Global Impacts, Challenges and Future Directions of Pest Management (Hardcover): Peter Mason Biological Control - Global Impacts, Challenges and Future Directions of Pest Management (Hardcover)
Peter Mason
R4,390 Discovery Miles 43 900 Ships in 12 - 17 working days

There are many books on biological control, but this will bring up to date the regulatory and other specific challenges facing biological control, and how they are being met. It is the first book to bring together a comprehensive account of global activities in biological control, region-by-region, amalgamating information from introduction biological control, conservation biological control and augmentative biological control (including commercial use). Offers a historical summary of organisms and main strategies used in biological control. Outlines key challenges confronting biological control in the 21st century and describes the main socioeconomic challenges that need to be addressed. Global overview: summarises biological control efforts around the globe and highlights important successes and failures, providing suggestions to best move biological control forward in a changing world. Biological control is a fairly specialized field but one that is spread across a broad array of socio-environments in agriculture and public health around the world. There is also a significant regulatory component to a subset of this field (classical biological control) that researchers must navigate to achieve the aims of their research and its application. This book will help!

Microbial Diversity in Honeybees (Hardcover): Charles Wick, David Wick Microbial Diversity in Honeybees (Hardcover)
Charles Wick, David Wick
R3,580 Discovery Miles 35 800 Ships in 12 - 17 working days

Honeybees are an important link in our food chain because they are major pollinators of food crops. In recent years, honeybee populations have declined precipitously perhaps due to changes in their microbiome. This book describes and identifies the bee microbiome using a proteomics technology. Chapters include the detection and identification of microbes found in honeybees collected around the United States. This book contains new data and illustrates the rich diversity of microbes as collected by honeybees. It is a must read for everyone concerned about the honeybee and working in the industry.

Phylogenetics of Bees (Paperback): Rustem Abuzarovich Ilyasov, Hyung Wook Kwon Phylogenetics of Bees (Paperback)
Rustem Abuzarovich Ilyasov, Hyung Wook Kwon
R1,506 Discovery Miles 15 060 Ships in 12 - 17 working days

Bees are flying insects of the order Hymenoptera closely related to wasps and ants. The ancestors of bees are assumed to be predatory wasps, which switched to pollen consumption. Further, bees co-evolved with flowering plants and divided into several species according to climatic conditions. Widely known bees are western bees Apis mellifera, and eastern bees Apis cerana. This book sheds light on features of evolution, phylogenesis, speciation, adaptation to environment, and taxonomy of bees. It will be of particular relevance to evolutionists, geneticists, taxonomists, ecologists, population geneticist, and breeders.

Area-Wide Management of Fruit Fly Pests (Paperback): Pablo Montoya, Diana Perez-Staples, Francisco Diaz-Fleischer, Maria Vera Area-Wide Management of Fruit Fly Pests (Paperback)
Pablo Montoya, Diana Perez-Staples, Francisco Diaz-Fleischer, Maria Vera
R1,525 Discovery Miles 15 250 Ships in 12 - 17 working days

Fruit fly (Diptera: Tephritidae) pests have a profound impact on horticultural production and economy of many countries. It is fundamental to understand their biology and evaluate methods for their suppression, containment, or eradication. Area-Wide Management of Fruit Fly Pests comprises contributions from scientists from around the world on several species of tephritids working on diverse subjects with a focus on area-wide management of these pests. The first three sections of the book explore aspects of the biology, ecology, physiology, behavior, taxonomy, and morphology of fruit flies. The next two sections provide evidence on the efficacy of attractants, risk assessment, quarantine, and post-harvest control methods. The fifth and sixth sections examine biological control methods such as the Sterile Insect Technique and the use of natural enemies of fruit flies. The seventh section focuses on area-wide integrated pest management and action programs. Finally, the eighth section examines social, economic, and policy issues of action programs aimed at involving the wider community in the control of these pests and facilitate the development of control programs. Features: Presents information on the biology of tephritid flies. Provides knowledge on the use of natural enemies of fruit flies for their biological control. Includes research results on models and diets used for the Sterile Insect Technique. Reports developments on the chemical ecology of fruit flies that contribute to make control methods more specific and efficient. Reviews subjects such as Holistic Pest Management and Area-Wide Management Programs including social, economic, and policy issues in various countries. The Open Access version of this book, available at https://www.taylorfrancis.com/books/9780429355738, has been made available under a Creative Commons Attribution-Non Commercial-No Derivatives 4.0 license.

Introduction to Non-Mulberry Silkworms (Hardcover): D. Elumalai, P. Mohan raj, R. Ramamoorthy, C Mohan, B. Poovizhiraja Introduction to Non-Mulberry Silkworms (Hardcover)
D. Elumalai, P. Mohan raj, R. Ramamoorthy, C Mohan, B. Poovizhiraja
R3,306 Discovery Miles 33 060 Ships in 12 - 17 working days

This book will serve as a valuable source of information on the aspects of history, current scenario, non-mulberry cultivation, pruning, pests and diseases of eri, tasar and muga, silkworm rearing, pests and diseases of non-mulberry silkworm, processing of cocoon etc. This book can be used as resource material and practical guide for the students of agriculture, horticulture and sericulture. Note: T&F does not sell or distribute the Hardback in India, Pakistan, Nepal, Bhutan, Bangladesh and Sri Lanka.

Reproduction and Development in Mollusca (Paperback): T. J Pandian Reproduction and Development in Mollusca (Paperback)
T. J Pandian
R1,439 Discovery Miles 14 390 Ships in 12 - 17 working days

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.

Biology and Ecology of Edible Marine Gastropod Molluscs (Paperback): Ramasamy Santhanam Biology and Ecology of Edible Marine Gastropod Molluscs (Paperback)
Ramasamy Santhanam
R2,538 Discovery Miles 25 380 Ships in 12 - 17 working days

This comprehensive volume focuses exclusively on sea snails (or gastropods), which are popular food items and occupy an important role in the commercial shell craft industry. Familiar examples include conchs (highly sought after due to their mild flavor) and escargot, abalone, and periwinkle snails. This book covers the profile (habitat, distribution, morphology, food and feeding, reproduction, conservation status, etc.) of about 180 species of commercial edible marine gastropod molluscs as well as their nutritional values, commercial importance, and pharmaceutical value. Also included is information on their prevalent diseases and parasites. The informative descriptions are presented in an easy-to-read style with neat illustrations.

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