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Author: Delphine Beyrend Publisher: ISBN: Category : Languages : en Pages : 69
Book Description
La température et la salinité sont les principaux facteurs abiotiques qui, dans les estuaires, affectent le développement des copépodes Le but de ce D.S.R était principalement d'apprendre à identifier le cycle de vie du copépode sub-tropical Pseudodiaptomus annandalei (Taiwan) et à comparer ces premiers résultats à ceux précédemment obtenus sur le copépode tempéré Eurytemora aflinis (France) afin d'améliorer au maximum le protocole expérimental de comparaison. Le travail de comparaison de deux souches génétiquement différentes du même copépode tempéré E affinis a été abordé au cours du stage de Master. Ce travail a été repris et complété au début du DSR dans un but de finaliser une publication scientifique dont le manuscrit est présenté en annexe. Ce mémoire présente une étude comparative préliminaire des traits du cycle de vie, de la morphologie générale et fonctionnelle de ces deux espèces de copépodes. L'étude du cycle de vie, réalisé 5°C en dessous de leur température optimale respective, à 3 salinités différentes, a révélé un ordre de grandeur conséquent entre P annandalei et E affinis en ce qui concerne le développement et la reproduction. Le développement d'une cohorte de P annandalei à 25°C est d'environ 10 jours alors que celui d'E aflinis obtenu à 10°C est de 20 jours Le développement lent d'E. affinis est compensé par une fécondité doublement supérieure à celle de P. annandalei. La gamme de tolérance à la salinité pour P. annandalei (15 et 25psu) semble décalée par rapport à celle d'E. affinis (5 et 15psu). L'étude morphologique a montré que les individus P. annandalei sont de plus petites tailles et que les caractères sexuels secondaires diffèrent d'une espèce à l'autre. Une étude in situ de la population d'E. affinis a montré qu'à l'endroit présumé de son maximum d'abondance, elle semble affectée, lors d'une saison chaude par les conditions environnementales, alors que la population Acartia spp. semble au contraire favorisée par ces conditions.
Author: Delphine Beyrend Publisher: ISBN: Category : Languages : en Pages : 69
Book Description
La température et la salinité sont les principaux facteurs abiotiques qui, dans les estuaires, affectent le développement des copépodes Le but de ce D.S.R était principalement d'apprendre à identifier le cycle de vie du copépode sub-tropical Pseudodiaptomus annandalei (Taiwan) et à comparer ces premiers résultats à ceux précédemment obtenus sur le copépode tempéré Eurytemora aflinis (France) afin d'améliorer au maximum le protocole expérimental de comparaison. Le travail de comparaison de deux souches génétiquement différentes du même copépode tempéré E affinis a été abordé au cours du stage de Master. Ce travail a été repris et complété au début du DSR dans un but de finaliser une publication scientifique dont le manuscrit est présenté en annexe. Ce mémoire présente une étude comparative préliminaire des traits du cycle de vie, de la morphologie générale et fonctionnelle de ces deux espèces de copépodes. L'étude du cycle de vie, réalisé 5°C en dessous de leur température optimale respective, à 3 salinités différentes, a révélé un ordre de grandeur conséquent entre P annandalei et E affinis en ce qui concerne le développement et la reproduction. Le développement d'une cohorte de P annandalei à 25°C est d'environ 10 jours alors que celui d'E aflinis obtenu à 10°C est de 20 jours Le développement lent d'E. affinis est compensé par une fécondité doublement supérieure à celle de P. annandalei. La gamme de tolérance à la salinité pour P. annandalei (15 et 25psu) semble décalée par rapport à celle d'E. affinis (5 et 15psu). L'étude morphologique a montré que les individus P. annandalei sont de plus petites tailles et que les caractères sexuels secondaires diffèrent d'une espèce à l'autre. Une étude in situ de la population d'E. affinis a montré qu'à l'endroit présumé de son maximum d'abondance, elle semble affectée, lors d'une saison chaude par les conditions environnementales, alors que la population Acartia spp. semble au contraire favorisée par ces conditions.
Author: Delphine Beyrend Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
The study of the plankton population dynamics brings new insights on the effects of the global climate change on aquatic ecosystems. However, there is a real need to have a global overview of these effects through inter-site comparisons at appropriate scales. France and Taiwan are two countries located in contrasting climate regimes, respectively temperate and subtropical/tropical. In France, the temperate brackish copepod Eurytemora affinis which is known as key species has been the subject of numerous laboratory and field studies. P. annandalei which is also a dominant brackish copepod but in subtropical/tropical Indo-Pacific regions found in Taiwan, has not been well studied despite its ecological and economical importance. In this thesis we studied the life history of the copepod P. annandalei particularly the effects of temperature-salinity interactions and other aspects such as the reproductive biology to understand its population dynamics in the field. We also investigate the population dynamics of dominant copepods in two contrasting estuaries including P. annandalei and E. affinis respectively in the subtropical Danshuei Estuary and the temperate Seine Estuary. The main originality of this work was to use similar protocols in laboratory and in the field observations in the two contrasting systems. The life history study of P. annandalei highlighted the importance of temperature and salinity in its life cycle strategy. It is able to develop and reproduce in a wide range of temperature-salinity conditions however it showed better fitness at temperature 25-30°C and salinity 15. The field studies showed that the population dynamics of copepods was driven by different environmental factors in the two contrasting systems such as the river discharge in the temperate Seine Estuary and the typhoons in the subtropical Danshuei Estuary. Finally our result may find some interests and applications in subtropical/tropical copepod population dynamics and in industrial aquaculture as well as in the ecology of subtropical brackish systems within the global climate change context.
Author: National Research Council Canada Publisher: NRC Research Press ISBN: 9780660149547 Category : Technology & Engineering Languages : en Pages : 276
Book Description
Up-to-date information, knowledge and research in progress in scientific fields related to natural production of juvenile Atlantic salmon and some other ecologically similar fluvial salmonids is contained in the 25 papers and 12 abstracts contained in this publication, which were prepared for an international symposium held in St. John's, Newfoundland. Studies relate to stream ecology, invertebrates and predators, habitat improvement, competitive effects, behaviour and dispersal, habitat and production of juvenile salmon, population dynamics and relationships of juvenile salmon estimates to smolt yields. A list of participants at the conference is also provided.
Author: Koen Martens Publisher: Springer Science & Business Media ISBN: 9400710844 Category : Science Languages : en Pages : 347
Book Description
In this age of increased fundamental and applied research on biodiversity, no single volume was as yet devoted to the various temporal and spatial aspects of aquatic biodiversity. The present book is published in honour of Professor Henri Dumont (Ghent, Belgium) at the occasion of his retirement as Editor-in-Chief of Hydrobiologia. The volume presents a selection of contributions on aquatic biodiversity, written by colleagues from the editorial board, fellow editors of aquatic journals and former students and collaborators. Contributions deal with a wide spectrum of topics related to aquatic biodiversity and cover fields such as actual- and palaeolimnology, taxonomy, and fundamental and applied limnology. Even reconnaissance chapters on management and cultural impact of water bodies are included. The book combines state-of-the-art contributions in aquatic sciences.
Author: Jan E. Vermaat Publisher: Springer Science & Business Media ISBN: 3540271503 Category : Political Science Languages : en Pages : 401
Book Description
Coastal zones play a key role in Earth System functioning and form an “edge for society” providing a significant contribution to the life support systems. Goods and services derived from coastal systems depend strongly on multiple transboundary interactions with the land, atmosphere, open ocean and sea bottom. Increasing demands on coastal resources driven by human habitation, food security, recreation and transportation accelerate the exploitation of the coastal landscape and water bodies. Many coastal areas and human activities are subject to increasing risks from natural and man-induced hazards such as flooding resulting from major changes in hydrology of river systems that has reached a global scale. Changes in the hydrological cycle coupled with changes in land and water management alter fluxes of materials transmitted from river catchments to the coastal zone, which have a major effect on coastal ecosystems. The increasing complexity of underlying processes and forcing functions that drive changes on coastal systems are witnessed at a multiplicity of temporal and spatial scales.
Author: Leo Posthuma Publisher: CRC Press ISBN: 1420032313 Category : Mathematics Languages : en Pages : 617
Book Description
In spite of the growing importance of Species Sensitivity Distribution models (SSDs) in ecological risk assessments, the conceptual basis, strengths, and weaknesses of using them have not been comprehensively reviewed. This book fills that need. Written by a panel of international experts, Species Sensitivity Distributions in Ecotoxicology reviews
Author: Roger S. V. Pullin Publisher: WorldFish ISBN: 9710400045 Category : Cichlids Languages : en Pages : 429
Book Description
This conference brought together 19 tilapia biologists and experimental culturists from 10 countries. It was designed from the outset as a technical conference on the basic biology of the tilapias and applications in culture systems. The conference did not consider the commercial aspects of tilapia culture.
Author: BACC Author Team Publisher: Springer ISBN: 9783642091896 Category : Science Languages : en Pages : 0
Book Description
This book offers an up-to-date overview of the latest scientific findings in regional climate research on the Baltic Sea basin. This includes climate changes in the recent past, climate projections up until 2100 using the most sophisticated regional climate models available, and an assessment of climate change impacts on terrestrial, freshwater and marine ecosystems. The authors demonstrate that the regional climate has already started to change, and will continue to do so.
Author: Delphine Beyrend
Author: Delphine Beyrend
Author: Delphine Beyrend
Author: 
Author: National Research Council Canada
Author: Koen Martens
Author: Jan E. Vermaat
Author: Leo Posthuma
Author: 
Author: Roger S. V. Pullin
Author: BACC Author Team