Geoffrey E. Hill – författare

The last documented sighting of the Ivory-billed Woodpecker--one of the rarest and most intriguing animals in the world--was noted over 50 years ago. Long thought to be extinct, the 2005 announcement of a sighting in Arkansas sparked tremendous enthusiasm and hope that this species could yet be saved. But the subsequent failure of a massive search to relocate Ivorybills in Arkansas made hope for the species'' revival short-lived. Here, noted ornithologist Geoffrey Hill tells the story of how he and two of his colleagues stumbled upon what may be a breeding population of Ivory-billed Woodpeckers in the swamps of northern Florida. He relates their laborious attempts to document irrefutable evidence for the existence of this shy, elusive bird following the failure of a much larger research team to definitively prove the bird''s existence. Hill tells of his travails both in and out of the vast swamp wilderness, pulling back the curtain to reveal the little-seen political maneuvering that is part of all modern science. He explains how he and his group decided who to exclude or include as their findings came in, and why they felt the need to keep their search a secret. Hill returns repeatedly to how expectations can guide observations, and how tempting it is to oversell evidence in the face of the struggle between an overwhelming desire to find the bird and the need to retain integrity and objectivity. Written like a good detective story, Ivorybill Hunters also delves into the science behind the rediscovery of a species, explaining how professional ornithologists follow up on a sight record of a rare bird, and how this differs from the public''s perception of how scientists actually work. Hill notes the growing role of amateurs in documenting bird activity and discusses how the community of birders and nature lovers can see, enjoy, and help preserve these birds. Ivorybill Hunters will prove a fascinating read for those with an interest in natural history, adventure, environmental conservation, and science, as well as the more than forty-six million Americans who now call themselves birdwatchers.

This novel text provides a concise synthesis of how the interactions between mitochondrial and nuclear genes have played a major role in shaping the ecology and evolution of eukaryotes. The foundation for this new focus on mitonuclear interactions originated from research in biochemistry and cell biology laboratories, although the broader ecological and evolutionary implications have yet to be fully explored. The imperative for mitonuclear coadaptation is proposedto be a major selective force in the evolution of sexual reproduction and two mating types in eukaryotes, in the formation of species, in the evolution of ornaments and sexual selection, in the process of adaptation, and in the evolution of senescence. The book highlights the importance ofmitonuclear coadaptation to the evolution of complex life and champions mitonuclear ecology as an important subdiscipline in ecology and evolution.

This is an account of studies of the function and evolution of colorful plumage in the House Finch. It is also an engaging study on the evolution of sexual selection in birds and a lively portrait of the challenges and constraints of experimental design facing any field investigator working with animal behavior. Part I sets the stage for modern studies of the function of plumage coloration with a review of the nineteenth and beginning of the twentieth centuries. Part II focuses on the proximate control and present function of plumage coloration. Part III takes a more explicitly evolutionary approach to the study of plumage coloration using biogeography and phylogeny to test hypotheses for why specific forms of plumage color display have evolved. It concludes with an account of comparative studies that have been conducted in the House Finch and other cardueline finches and the insight these studies have provided on the evolution of carotenoid-based ornamental coloration.

The last documented sighting of the Ivory-billed Woodpecker--one of the rarest and most intriguing animals in the world--was noted over 50 years ago. Long thought to be extinct, the 2005 announcement of a sighting in Arkansas sparked tremendous enthusiasm and hope that this species could yet be saved. But the subsequent failure of a massive search to relocate Ivorybills in Arkansas made hope for the species' revival short-lived. Here, noted ornithologist Geoffrey Hill tells the story of how he and two of his colleagues stumbled upon what may be a breeding population of Ivory-billed Woodpeckers in the swamps of northern Florida. He relates their laborious attempts to document irrefutable evidence for the existence of this shy, elusive bird following the failure of a much larger research team to definitively prove the bird's existence. Hill tells of his travails both in and out of the vast swamp wilderness, pulling back the curtain to reveal the little-seen political maneuvering that is part of all modern science. He explains how he and his group decided who to exclude or include as their findings came in, and why they felt the need to keep their search a secret. Hill returns repeatedly to how expectations can guide observations, and how tempting it is to oversell evidence in the face of the struggle between an overwhelming desire to find the bird and the need to retain integrity and objectivity.Written like a good detective story, Ivorybill Hunters also delves into the science behind the rediscovery of a species, explaining how professional ornithologists follow up on a sight record of a rare bird, and how this differs from the public's perception of how scientists actually work. Hill notes the growing role of amateurs in documenting bird activity and discusses how the community of birders and nature lovers can see, enjoy, and help preserve these birds. Ivorybill Hunters will prove a fascinating read for those with an interest in natural history, adventure, environmental conservation, and science, as well as the more than forty-six million Americans who now call themselves birdwatchers.

This is an account of studies of the function and evolution of colorful plumage in the House Finch. It is also an engaging study on the evolution of sexual selection in birds and a lively portrait of the challenges and constraints of experimental design facing any field investigator working with animal behavior. Part I sets the stage for modern studies of the function of plumage coloration with a review of the nineteenth and beginning of the twentieth centuries. Part II focuses on the proximate control and present function of plumage coloration. Part III takes a more explicitly evolutionary approach to the study of plumage coloration using biogeography and phylogeny to test hypotheses for why specific forms of plumage color display have evolved. It concludes with an account of comparative studies that have been conducted in the House Finch and other cardueline finches and the insight these studies have provided on the evolution of carotenoid-based ornamental coloration.

This novel text provides a concise synthesis of how the interactions between mitochondrial and nuclear genes have played a major role in shaping the ecology and evolution of eukaryotes. The foundation for this new focus on mitonuclear interactions originated from research in biochemistry and cell biology laboratories, although the broader ecological and evolutionary implications have yet to be fully explored. The imperative for mitonuclear coadaptation is proposed to be a major selective force in the evolution of sexual reproduction and two mating types in eukaryotes, in the formation of species, in the evolution of ornaments and sexual selection, in the process of adaptation, and in the evolution of senescence. The book highlights the importance of mitonuclear coadaptation to the evolution of complex life and champions mitonuclear ecology as an important subdiscipline in ecology and evolution.

This novel text provides a concise synthesis of how the interactions between mitochondrial and nuclear genes have played a major role in shaping the ecology and evolution of eukaryotes. The foundation for this new focus on mitonuclear interactions originated from research in biochemistry and cell biology laboratories, although the broader ecological and evolutionary implications have yet to be fully explored. The imperative for mitonuclear coadaptation is proposed to be a major selective force in the evolution of sexual reproduction and two mating types in eukaryotes, in the formation of species, in the evolution of ornaments and sexual selection, in the process of adaptation, and in the evolution of senescence. The book highlights the importance of mitonuclear coadaptation to the evolution of complex life and champions mitonuclear ecology as an important subdiscipline in ecology and evolution.

One cannot help being struck with wonder at the vivid pink of 10,000 flamingos rising from Lake Nakuru or the glowing red gorget of a ruby-throated hummingbird feeding outside the kitchen window. How birds produce the brilliant and striking coloration of their feathers and other body parts is the focus of this first volume of Bird Coloration. It has been more than 40 years since the mechanisms of color production of birds have been reviewed and synthesized and in those 40 years new pigments have been discovered, new genetic mechanisms have been described, new theories have been developed, and hundreds of new experiments have been conducted.Geoffrey Hill and Kevin McGraw have assembled the world’s leading experts in perception, measurement, and control of bird coloration to contribute to this book. This sumptuously illustrated volume synthesizes more than 1,500 technical papers in this field. The focus is on the three primary mechanisms of color production—melanin pigmentation, carotenoid pigmentation, and structural coloration—but less common as well as newly described mechanisms of color production are also reviewed in detail. The visual perception of birds and the best ways to collect and analyze color data are, for the first time, presented as part of the review of mechanisms of coloration. This book will be essential reading for biologists studying animal coloration, but it will also be treasured by anyone curious about how birds produce and perceive their bold and brilliant color displays.

In this companion volume to Bird Coloration, Volume 1: Mechanisms and Measurements, Geoffrey E. Hill and Kevin J. McGraw have assembled some of the world’s leading experts in the function and evolution of bird coloration to contribute to a long-overdue synthesis of a burgeoning field of inquiry. In Volume 2, the authors turn from the problem of how birds see and produce color, and how researchers measure it, to the function of the colorful displays of birds and the factors that shape the evolution of color signals.The contributors to this volume begin by examining the function of coloration in a variety of contexts from mate choice, to social signaling, to individual recognition, synthesizing a vast amount of recent findings by researchers around the world. The volume and the series conclude with chapters that consider coloration from an explicitly evolutionary perspective, examining selective pressures that have led to the evolution of colors and patterns on body and plumage. These functional and evolutionary studies build from research on mechanisms of production and controls of expression, covered in the previous volume, bringing the study of color full circle.This sumptuously illustrated book will be essential reading for biologists studying animal coloration, but it will also be treasured by anyone curious about why birds are colorful and how they got that way.

A must-have reference that enables birders of any level to identify each bird by its color.Cardinals, blue jays, yellow-bellied sapsuckers, ruby-throated hummingbirds, green honeycreepers: color is often the very first feature that captures our attention. Yet only recently have ornithologists begun to unravel the mysteries behind birds’ brilliant plumage and biological processes that produce such vivid hues. Although scientists have made remarkable progress, much of this knowledge remains out of reach for general readers. This book bridges that gap by showcasing the dazzling spectrum of bird coloration and explaining, in clear and accessible language, how birds achieve their remarkable colors. Richly illustrated with stunning artwork and photography, the book is divided into two parts. Part One explores the science of color in feathers. Chapters examine how coloration varies within a species and how these variations can signal sex, age, and individual identity. This section also considers how color can function both as camouflage and as a bold display that attracts mates or deters rivals. Part Two presents a color-coded gallery of more than 200 species, spanning the spectrum from red to violet—and including brown, black, white, and multicolored birds. Each entry highlights how particular colors arise, explains their biological purpose (whether camouflage, species recognition, or courtship), and features a concise fact file listing common and scientific names, distribution, habitat, size, and coloration.