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Author: Victor R. Alekseev Publisher: Springer ISBN: Category : Nature Languages : en Pages : 260
Book Description
Focuses on the ability crustaceans share with a wide range of invertebrates, to lay eggs that can survive for years without any apparent metabolism in a dry condition, then rapidly develop when water finally comes, and lay another generation of resting eggs. The 26 papers cover the evolutionary aspects, the physiology, induction and termination, the nature of resting stages and their role in the population dynamics of marine and freshwater crustaceans, and crustacean life histories. Specific topics include micro- and macro-evolutionary patterns and processes influencing the distribution of crustacean diapause, the variation in torpidity of diapause in freshwater cyclopoid copepods, the significance of photoperiodism and diapause control in the multicycle Crustacean Daphnia pulex Leydig, the role of parthenogenetic natality and emergence from diapausing eggs in the dynamics of some rotifer populations, and the role of food availability in the variable life history of a cyclopoid copepod. No index. Annotation copyright by Book News, Inc., Portland, OR
Author: Victor R. Alekseev Publisher: Springer ISBN: Category : Nature Languages : en Pages : 260
Book Description
Focuses on the ability crustaceans share with a wide range of invertebrates, to lay eggs that can survive for years without any apparent metabolism in a dry condition, then rapidly develop when water finally comes, and lay another generation of resting eggs. The 26 papers cover the evolutionary aspects, the physiology, induction and termination, the nature of resting stages and their role in the population dynamics of marine and freshwater crustaceans, and crustacean life histories. Specific topics include micro- and macro-evolutionary patterns and processes influencing the distribution of crustacean diapause, the variation in torpidity of diapause in freshwater cyclopoid copepods, the significance of photoperiodism and diapause control in the multicycle Crustacean Daphnia pulex Leydig, the role of parthenogenetic natality and emergence from diapausing eggs in the dynamics of some rotifer populations, and the role of food availability in the variable life history of a cyclopoid copepod. No index. Annotation copyright by Book News, Inc., Portland, OR
Author: Luc Brendonck Publisher: ISBN: Category : Science Languages : en Pages : 576
Book Description
Resting stages (diapause) are important for the life cycles of many crustaceans and have played a key role in the adaptive radiation of Brachiopoda, Ostracoda and Copepoda. Dormancy strategies determined by the characteristics of the onset of and the termination of the resting phase have substantial significance for ecological and evolutionary dynamics. The forty-one contributions in this volume stem from the second international symposium 'Diapause in the Crustacea' held in Gent, Belgium August 24-29 1998.
Author: Victor R. Alekseev Publisher: Springer Science & Business Media ISBN: 140205680X Category : Technology & Engineering Languages : en Pages : 266
Book Description
Many authors of this new book were participants at the workshop on diapause in aquatic invertebrates (Pallanza, Italy 2003). This book consists of two major parts: phenomenology of diapause and significance of this adaptation in scientific and practical uses. It combines the theoretical part with the application of knowledge on diapause in the wide spectrum of scientific and applied fields.
Author: David L. Denlinger Publisher: Cambridge University Press ISBN: 1108755186 Category : Science Languages : en Pages : 465
Book Description
Our highly seasonal world restricts insect activity to brief portions of the year. This feature necessitates a sophisticated interpretation of seasonal changes and enactment of mechanisms for bringing development to a halt and then reinitiating it when the inimical season is past. The dormant state of diapause serves to bridge the unfavourable seasons, and its timing provides a powerful mechanism for synchronizing insect development. This book explores how seasonal signals are monitored and used by insects to enact specific molecular pathways that generate the diapause phenotype. The broad perspective offered here scales from the ecological to the molecular and thus provides a comprehensive view of this exciting and vibrant research field, offering insights on topics ranging from pest management, evolution, speciation, climate change and disease transmission, to human health, as well as analogies with other forms of invertebrate dormancy and mammalian hibernation.
Author: T. J. Pandian Publisher: CRC Press ISBN: 1498748295 Category : Nature Languages : en Pages : 295
Book Description
Dating back to the early Cambrian period, crustaceans had ample time to undertake endless experimentation with form and function. Today, no other group of plants or animals on the planet exhibit the range of morphological diversity seen among extant Crustacea. With more than 52,000 species, they are placed fourth in terms of overall species diversi
Author: Jiabo Tan Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Encysted embryos of the crustacean Artemia franciscana enter diapause, a developmental state of greatly reduced metabolic activity and enhanced stress tolerance that allows survival under adverse environmental conditions. Diapausing A. franciscana are characterized by the synthesis of molecular chaperones such as the small heat shock proteins (sHSPs), p26, ArHsp21 and ArHsp22, and the ferritin homologue, artemin. A full-length cDNA encoding the A. franciscana transcription factor, heat shock factor 1 (Hsf1), was cloned and sequenced, revealing a deduced protein of 65.3 kDa which contained a conserved DNA binding domain. Hsf1 cDNA was employed as template to make double stranded RNA (dsRNA) used for RNA interference (RNAi) and thus to determine the role of Hsf1 in the regulation of gene expression during diapause. qRT-PCR and immunoprobing of western blots with an antibody raised to Hsf1 from A. franciscana respectively demonstrated the knockdown of hsf1 mRNA and Hsf1 in nauplii and cysts released from females receiving dsRNA. Nauplii lacking Hsf1 appeared normal but they died prematurely upon culturing. Hsf1 knockdown cysts were less stress resistant than cysts containing Hsf1, demonstrating a role for this transcription factor in the stress tolerance of diapausing A. franciscana. Immunoprobing of western blots showed that cysts released from females receiving hsf1 dsRNA lacked p26, an important diapause-specific sHsp in A. franciscana cysts. The knockdown of other sHsps and artemin, which have less influence on the stress tolerance of diapause cysts, also occurred but was more variable in extent. qRT-PCR and immunoprobing of western blots with an antibody raised to Hsf1 from A. franciscana demonstrates hsf1 mRNA and Hsf1 appeared earlier and was more abundant in oviparous versus ovoviviparous embryos. Examination of immunofluoresencently stained samples demonstrates Hsf1 localized earlier to nuclei from oviparous embryos. The results support the conclusion that Hsf1, perhaps in concert with other transcription factors, regulates expression of diapause-specific genes required for stress resistance and diapause in A. franciscana and that Hsf1 is important during A. franciscana development especially for the oviparous embryos.
Author: Victor R. Alekseev
Author: Victor R. Alekseev
Author: Viktor Rostislovovich Alekseev
Author: Luc Brendonck
Author: Victor R. Alekseev
Author: David L. Denlinger
Author: Viktor Rostislavovich Alekseev
Author: A. D. Lees
Author: Raymond George Stross
Author: T. J. Pandian
Author: Jiabo Tan