نتائج البحث

MBRLSearchResults

mbrl.module.common.modules.added.book.to.shelf
تم إضافة الكتاب إلى الرف الخاص بك!
عرض الكتب الموجودة على الرف الخاص بك .
وجه الفتاة! هناك خطأ ما.
وجه الفتاة! هناك خطأ ما.
أثناء محاولة إضافة العنوان إلى الرف ، حدث خطأ ما :( يرجى إعادة المحاولة لاحقًا!
هل أنت متأكد أنك تريد إزالة الكتاب من الرف؟
{{itemTitle}}
{{itemTitle}}
وجه الفتاة! هناك خطأ ما.
وجه الفتاة! هناك خطأ ما.
أثناء محاولة إزالة العنوان من الرف ، حدث خطأ ما :( يرجى إعادة المحاولة لاحقًا!
    منجز
    مرشحات
    إعادة تعيين
  • الضبط
      الضبط
      امسح الكل
      الضبط
  • مُحَكَّمة
      مُحَكَّمة
      امسح الكل
      مُحَكَّمة
  • السلسلة
      السلسلة
      امسح الكل
      السلسلة
  • مستوى القراءة
      مستوى القراءة
      امسح الكل
      مستوى القراءة
  • السنة
      السنة
      امسح الكل
      من:
      -
      إلى:
  • المزيد من المرشحات
      المزيد من المرشحات
      امسح الكل
      المزيد من المرشحات
      نوع المحتوى
    • نوع العنصر
    • لديه النص الكامل
    • الموضوع
    • بلد النشر
    • الناشر
    • المصدر
    • الجمهور المستهدف
    • المُهدي
    • اللغة
    • مكان النشر
    • المؤلفين
    • الموقع
541,706 نتائج ل "Birds."
صنف حسب:
The atlas of birds
The Atlas of Birds captures the breathtaking diversity of birds, and illuminates their conservation status around the world. Full-color maps show where birds are found, both by country and terrain, and reveal how an astounding variety of behavioral adaptations--from flight and feeding to nest building and song--have enabled them to thrive in virtually every habitat on Earth. Maps of individual journeys and global flyways chart the amazing phenomenon of bird migration, while bird classification is explained using maps for each order and many key families.
The handbook of bird families
\"This ultimate handbook contains a comprehensive survey of the world's birds, reflecting the latest classification changes to the Howard & Moore Complete Checklist of the Birds of the World. It includes an introduction to each of the bird orders and a detailed account and concise fact panel for every one of the 234 families. It details the appearance, behaviour and lifestyle of the family members, while a glossary, further reading list and an index ensure easy reference.\"-- Provided by publisher.
Video surveillance of nesting birds
Declining bird populations, especially those that breed in North American grasslands, have stimulated extensive research on factors that affect nest failure and reduced reproductive success. Until now, this research has been hampered by the difficulties inherent in observing nest activities. Video Surveillance of Nesting Birds highlights the use of miniature video cameras and recording equipment yielding new important and some unanticipated insights into breeding bird biology, including previously undocumented observations of hatching, incubation, fledging, diurnal and nocturnal activity patterns, predator identification, predator-prey interactions, and cause-specific rates of nest loss. This seminal contribution to bird reproductive biology uses tools capable of generating astonishing results with the potential for fresh insights into bird conservation, management, and theory.
How on Earth did that get there? Natural and human vectors of aquatic macrophyte global distribution
No previous study has examined the large-scale distributional drivers of the entire global pool of 3,499 macrophyte species, despite the obvious importance of this for understanding the macroecology of these plants. To assess the hypothesis that natural rather than human-related transfer vectors act as the primary long-distance drivers of global movement of aquatic macrophytes, we analysed current macrophyte species distributions in relation to a set of human-related and natural transfer vectors. Most macrophytes (2,492 species: 71.2% of the global total) are endemic to a single ecozone, and generally lack the various functional adaptations needed for successful long-distance propagule transport. Such traits are, however, common in the 1,007 (28.8%) species native in > 1 ecozone. In total, 779 species (22.3%) are introduced, naturalised or invasive (I species) in one or more ecozones outwith their native range. The proportion of I species varies between ecozones and is best predicted by annual temperature and longitude. A migratory bird transfer vector and climatic variables strongly predict global native macrophyte species occurrence. Some native species of Miocene origin (or older) may have had their world distribution influenced by ancient vicariance events, while inter-ecozone hydrochory and Late Quaternary climate change are also relevant factors influencing a few species.
Just like us! Birds
\"Gives young readers an up-close and personal look at how birds do things that are remarkably similar to the way humans do\"-- Provided by publisher.
Arctic shorebirds in North America
Each year shorebirds from North and South America migrate thousands of miles to spend the summer in the Arctic. There they feed in shoreline marshes and estuaries along some of the most productive and pristine coasts anywhere. With so much available food they are able to reproduce almost explosively; and as winter approaches, they retreat south along with their offspring, to return to the Arctic the following spring. This remarkable pattern of movement and activity has been the object of intensive study by an international team of ornithologists who have spent a decade counting, surveying, and observing these shorebirds. In this important synthetic work, they address multiple questions about these migratory bird populations. How many birds occupy Arctic ecosystems each summer? How long do visiting shorebirds linger before heading south? How fecund are these birds? Where exactly do they migrate and where exactly do they return? Are their populations growing or shrinking? The results of this study are crucial for better understanding how environmental policies will influence Arctic habitats as well as the far-ranging winter habitats used by migratory shorebirds.
The atlas of birds : diversity, behavior, and conservation
\"The Atlas of Birds captures the breathtaking diversity of birds, and illuminates their conservation status around the world. Full-color maps show where birds are found, both by country and terrain, and reveal how an astounding variety of behavioral adaptations -- from flight and feeding to nest building and song -- have enabled them to thrive in virtually every habitat on Earth. Maps of individual journeys and global flyways chart the amazing phenomenon of bird migration, while bird classification is explained using maps for each order and many key families. Conservation provides a strong focus throughout, with maps illustrating where and why birds are most under threat, and what is being done to protect them. Separate sections examine key factors influencing their distribution and endangering their survival, from deforestation and climate change to invasive species and the cage-bird trade. Bird groups most affected, such as island endemics, are highlighted, while a fascinating chapter explores the complex historical relationship between birds and humans, with maps and data for everything from poultry farming to birdwatching. The maps are supported by an authoritative text that uses the very latest data and case studies from BirdLife International. Packed with sumptuous photos, original diagrams, and imaginative graphics that bring the numbers to life, this book is a stunning and timely insight into perhaps the most colorful and intriguing group of organisms on our planet\"--Front flap.
Physiological adaptations for breeding in birds
Physiological Adaptations for Breeding in Birdsis the most current and comprehensive account of research on avian reproduction. It develops two unique themes: the consideration of female avian reproductive physiology and ecology, and an emphasis on individual variation in life-history traits. Tony Williams investigates the physiological, metabolic, energetic, and hormonal mechanisms that underpin individual variation in the key female-specific reproductive traits and the trade-offs between these traits that determine variation in fitness. The core of the book deals with the avian reproductive cycle, from seasonal gonadal development, through egg laying and incubation, to chick rearing. Reproduction is considered in the context of the annual cycle and through an individual's entire life history. The book focuses on timing of breeding, clutch size, egg size and egg quality, and parental care. It also provides a primer on female reproductive physiology and considers trade-offs and carryover effects between reproduction and other life-history stages. In each chapter, Williams describes individual variation in the trait of interest and the evolutionary context for trait variation. He argues that there is only a rudimentary, and in some cases nonexistent, understanding of the physiological mechanisms that underpin individual variation in the major reproductive life-history traits, and that research efforts should refocus on these key unresolved problems by incorporating detailed physiological studies into existing long-term population studies, generating a new synthesis of physiology, ecology, and evolutionary biology.