Xem 1-20 trên 48 kết quả Marine ecology
  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: T4 genes in the marine ecosystem: studies of the T4-like cyanophages and their role in marine ecology

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  • Marine birds are equally at home on land, in the air, and in the water. While many organisms can go from land to water (amphibians, some reptiles, some insects), others generally live in only one medium during their lives. Marine birds switch from one to the other, often daily. Such flexibility requires unique physiological and morphological adaptations to the environment, a medium that has also exerted selective forces on the behavior, ecology, and demography of these birds.

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  • Experts working in diverse areas of coastal and estuarine risk assessment contributed to this first volume of the CRC Press Environmental Risk Series. Contributors were asked to address a comprehensive series of important topics including the regulatory context for coastal and estuarine risk assessment, emerging contaminants of concern, effects to marine mammals, bioavailability and exposure of marine organisms to inorganic and organic contaminants, and effects of contaminants on ecological entities ranging from biomolecules to landscapes....

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  • This book is about the distribution and abundance of different types of organism, and about the physical, chemical but especially the biological features and interactions that determine these distributions and abundances. Unlike some other sciences, the subject matter of ecology is apparent to everybody: most people have observed and pondered nature, and in this sense most people are ecologists of sorts. But ecology is not an easy science.

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  • The timing of the publication of this book couldn’t be better as we celebrate the 50th anniversary of Charles Elton’s seminal book, The Ecology of Invasions by Animals and Plants. Since this influential book was published in 1958, the study of bioinvasions has developed exponentially, alongside the exponential growth in the magnitude of the invasion problem itself. Today, bioinvasion, a highly complex ecological process and environmental concern, has become a specific branch in ecology and environmental studies, with many disciplines developing within it....

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  • Đối với hai thập kỷ, Ben Gerwick của khả năng để nắm bắt hiện trạng thực hành và trình bày nó 1 cách đơn giản dễ tiêu hóa, xây dựng biển và ra nước ngoài cấu trúc các tài liệu tham khảo của sự lựa chọn cho kỹ sư xây dựng hiện đại, dân sự và hàng hải Các phiên bản 3 này lâu nămcuốn sách bán chạy nhất tiếp tục là hướng dẫn hiện đại nhất và có thẩm quyền trong lĩnh vực Dựa trên cuộc đời của tác giả kinh nghiệm, cuốn sách cũng kết hợp thông tin...

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  • There is a new era of global environmental factors that needs to be addressed via sound Corporate Environmental Management. Environmental problems are a key area of concern for the global community in the new 21st century. A sustainable global community is emerging that is geared toward preserving limited resources and the natural ecology, but to do so requires resource conservation and the reduction of environmental pollution loads across all human activities.

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  • As early as the middle of the 19th century, scientists were beginning to isolate and characterize organic compounds from nature. Modern studies of the nature of natural products, those compounds not involved in primary metabolic processes, began in the 1930s and 1940s. In the decades that followed, scientists began to focus on why organisms produce these compounds.

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  • Honey bees (Apis mellifera L.) are the main pollinating agents for numerous plants and fruit trees and, hence, play a key role in agriculture and more generally in the maintenance of ecological biodiversity. Although these social insects are not the targets of all the different agrochemical treatments used in crop protection, they are widely affected by pesticides.

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  • Concentrated animal feeding operations (CAFOs) are part of a recent agricultural trend toward large-scale, corporate-owned and managed livestock production. A far cry from the traditional family farm, CAFOs have lowered prices and increased production—but at a cost. While some of the problems CAFOs can cause are economic and related to small farm and farming community culture, or societal with a focus of the animal rights activism groups, other problems are ecological and environmental and will only be solved by intelligently crafted and enforced legislation....

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  • Coastlines are the world’s most important and intensely used of all areas settled by humans. It is this simple fact that directs special attention to the planning and management of coastlines. Coastal resources have been, and will continue to be, placed under multiple, intense and often competing pressures.

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  • Average depth model has a variety of applications in hydraulic engineering, especially in applications that flow depth is much smaller than the width of the flow. In this method the vertical variation is negligible and the hydraulic variables average integrated from channel bed to the surface free for the vertical axis. in equations arising management, pure hydrostatic pressure is assumed that not really valid in the case of flow in the bed is curved and can not be described curvature effects of the bed.

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  • Words can easily borrow, but the meaning of love from the heart of a people is difficult to describe. So I want to ask for forgiveness from the people that support can not be appreciated in the words and from those who, by any chance, I forgot to mention. First of all what I want to thank prof. dr.ir. Wind Herman and his wife - Joke. The interviews with prof. Wind held in Bangkok and his decision has helped me to be here, at the University of Twente, to carry out my doctoral research. Herman and Joke, I will never forget...

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  • Coastal lagoons are the most valuable components of coastal areas in terms of both ecosystem and natural capital. In most NATO coastal countries, the majority of the population lives within a 50-kilometer coastal band. Increasing human use and development pressures in the coastal areas make these dynamic and productive ecosystems very sensitive and vulnerable to deteriorations.

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  • Why did I decide to write this book? As an undergraduate student I could not make up my mind whether I wanted to be a zoologist or a botanist, so I decided to adopt ecology, in its broadest sense, as my area of interest. This led me to think about interactions among organisms and to try to look at ecosystems from a holistic, rather than from an autecological, point of view. As someone with little formal training in mycology, my interest in fungi started during my doctoral research, especially when attending university-wide lectures by C. T. Ingold, given at the University of London.

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  • England’s fisheries in 1871, Congress created the U.S. Commission of Fish and Fisheries (Hobart 1995). The first appointed Commissioner, Spencer Baird, initiated marine ecological studies as one of his first priorities. According to Baird, our understanding of fish “... would not be complete without a thorough knowledge of their associates in the sea, especially of such as prey upon them or constitute their food....” He understood that the presence or absence of fish was related not only to removal by fishing, but also to the dynamics of physical and chemical oceanography.

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  • CHAPTER ONE Introduction arguably ranks as the single most important episode in the development of Earth’s marine biota. Diverse benthic communities with complex tiering, trophic webs, and niche partitioning, together with an elaborate pelagic realm.

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  • In the sea medium, the accumulation of organisms can be observed at the water–solid body interface. Biomasses developing on hard surfaces often exceed those on softground bottom communities by tens and hundreds of times. Such a concentration of organisms points to their ecological and economic significance.

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  • The author wishes to express his sincere gratitude to the late Professor of Moscow State University, Academician T.S. Khachaturov, his former scientific adviser, whose work played a most important role in the formation of the main concept of the present book. In addition, the author is grateful to Professor David Zilberman of the University of California at Berkeley for ...

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  • CHAPTER SEVEN The Cambrian Radiation and the Diversification of Sedimentary Fabrics The Cambrian represents a pivotal point in the history of marine sedimentary rocks. Cambrian biofabrics that are directly a product of metazoans include ichnofabrics, shell beds, and constructional frameworks.

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