Sharks and their relatives, the rays and chimaeras, are the diverse group of cartilaginous fishes that have evolved over 400 million years. Historically considered of low economic value to large-scale fisheries, today many of these fishes have become the target of directed commercial and recreational fisheries around the world, and they are increasingly taken in the by-catch of fisheries targeting other species.
These species, a group of about 150 ground-dwelling gamebird, are found on every continent apart from Antarctica. They live in a wide variety of habitats from tropical forests, high-altitude alpine zones, temperate forests, open country, to desert environment. Although widespread, little is known of the species occuring outside Europe and North America, but several species are considered at grave risk of extinction.
In the five years since publication of the 1995-99 action plan, the Megapode Specialist Group has been active in promoting, initiating and executing conservation and research projects on thermometer birds. But the conservation outlook for many species remains bleak. Their habit of nesting on or near beaches, often on small islands, make them vulnerable to disturbance and egg-collection, and several species are greatly threatened.
As large ground-dwelling birds, pheasants are widely hunted for food, plumage and the live bird trade - consequently many species are threatened. They are largely dependent on forested habitats, making them highly vulnerable to deforestation and habitat degradation. The first edition covered 1995-1999, and many of its recommendations have been addressed.
Bryophytes are of great importance in their ecosystems and for human well-being. They stabilise soil crust through colonisation of bare grounds and rocks; they are essential in nutrient recycling, biomass production, and carbon fixing; they control water through an effective retention mechanism; and they have economic value as peat for fuel, horticulture, oil absorption, and as sources of a wide variety of chemical compounds.
The West Indian Iguanas form a unique group of species inhabiting tropical dry forests throughout the Bahanas and the Greater and Lesser Antilles. They are among the most endangered of the world's lizards, primarily because much of their fragile island habitat has been eliminated by human developemnt or severely degraded by exotic species. The Jamaican iguana, considered by some to be the rarest lizard in the world, may number no more than 100 adults.
Grouse have long attracted and fascinated people. Their display behaviour, and their traditional communal mating grounds or "leks", have inspired poetry and folklore as well as scientific theories on sexual selection and mating systems. Im many parts of their range, hunting plays a major role in the culture, economy, and subsistence of local communities.
This compilation brings together current information on the status of Asian freshwater cetacean populations, the factors that have caused their recent declines, and what can be done to improve their chances for survival. All of the species or populations in quesion are classified as endangered or critically endangered in the 1996 IUCN Red List of Threatened Animals.
