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Author : Christopher L. Merkord
Release : 2010
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Seasonality and elevational migration in an Andean bird community by : Christopher L. Merkord
Download or read book Seasonality and elevational migration in an Andean bird community written by Christopher L. Merkord. This book was released on 2010. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Christopher L. Merkord
Release : 2010
Genre : Birds
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Seasonality and Migration in an Andean Bird Community by : Christopher L. Merkord
Download or read book Seasonality and Migration in an Andean Bird Community written by Christopher L. Merkord. This book was released on 2010. Available in PDF, EPUB and Kindle. Book excerpt: Life history strategies of many birds in the Neotropics remain poorly known. In particular, details on the seasonal movements of individuals and populations within the Neotropics remain largely unknown, including short-distance movements along elevational gradients, known as altitudinal or elevational migration. Here I provide the first community-level assessment of avian elevational migration in South America. I used point counts, mist netting, focal observations of a mid-elevation mixed species flock to document the phenology and elevational movements of birds along a 2.7 km elevational gradient in Manu National Park, southeastern Peru. Breeding for most species started with the onset of the rainy season in September and peaked in November, while molt peaked in February. The timing of elevational migration varied. Using multiple field methods and analyses, I classified 55 species as elevational migrants and 169 as residents. Insectivores were more likely to be resident, while other foraging guilds were more likely to be migratory. Migrants molted more quickly than residents. The most abundant species during the dry season in the mid-elevation mixed-species flock were elevational migrants, suggesting a possible relationship between elevational migration and mixed-species flocking. The percentage of elevational migrants along the entire elevational gradient was higher than at Central American sites of similar latitude in the northern hemisphere, affirming a north-south geographic pattern of an increasing percentage of elevational migrants in bird communities. My results fill in an information gap on bird migration in the South America and provide a method of quantifying distributions along environmental gradients that can be applied to other taxa and gradients. Effective conservation of Andean ecosystems should include protection of complete elevational gradients, particularly given the uncertainties associated with future climate change.
Author : Juan Carlos Reboreda
Release : 2019-04-24
Genre : Science
Kind : eBook
Book Rating : 809/5 ( reviews)
Book Synopsis Behavioral Ecology of Neotropical Birds by : Juan Carlos Reboreda
Download or read book Behavioral Ecology of Neotropical Birds written by Juan Carlos Reboreda. This book was released on 2019-04-24. Available in PDF, EPUB and Kindle. Book excerpt: This book covers central aspects of behavioral ecology, including sexual selection, social and genetic mating systems, cooperative breeding, brood parasitism, brood reduction, migration, personalities and communication. Over the past several years, Neotropical bird species from temperate to tropical latitudes of South America have been extensively studied, yielding valuable insights into the evolutionary mechanisms that drive their behavioral traits. In this book, international experts provide a general overview of main behavioral aspects. They also present the main findings of their work, including experimental approaches to testing the most accepted behavioral theory in their model systems. In closing, they propose new theoretical frameworks and future research directions. As such, the book provides a comprehensive and updated guide for all researchers, students and professionals whose work involves the study and management of birds across the Neotropical region.
Author : Eberhard Gwinner
Release : 2012-12-06
Genre : Science
Kind : eBook
Book Rating : 423/5 ( reviews)
Book Synopsis Bird Migration by : Eberhard Gwinner
Download or read book Bird Migration written by Eberhard Gwinner. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: E. GWINNER! The phenomenon of bird migration with its large scale dimensions has attracted the attention of naturalists for centuries. Worldwide billions of birds leave their breeding grounds every autumn to migrate to areas with seasonally more favor able conditions. Many of these migrants travel only over a few hundred kilo meters but others cover distances equivalent to the circumference of the earth. Among these long-distance migrants are several billion birds that invade Africa every autumn from their West and Central Palaearctic breeding areas. In the Americas and in Asia the scope of bird migration is of a similar magnitude. Just as impressive as the numbers of birds are their achievements. They have to cope with the enormous energetic costs of long-distance flying. particularly while crossing oceans and deserts that do not allow replenishment of depleted fat reserves. They have to appropriately time the onset and end of migrations. both on a daily and annual basis. And finally. they have to orient their migratory movements in space to reach their species- or population-specific wintering and breeding grounds, irrespective of the variable climatic conditions along their migratory routes.
Author : Harold Greeney
Release : 2018-07-12
Genre : Nature
Kind : eBook
Book Rating : 54X/5 ( reviews)
Book Synopsis Antpittas and Gnateaters by : Harold Greeney
Download or read book Antpittas and Gnateaters written by Harold Greeney. This book was released on 2018-07-12. Available in PDF, EPUB and Kindle. Book excerpt: This authoritative handbook, part of the Helm Identification Guide series, looks in detail at the beautiful antpittas. Elusive study organisms for ornithologists and highly prized additions to the birder's life-list, the antpittas (Grallariidae) and gnateaters (Conopophagidae) are among the most poorly known Neotropical bird groups. This authoritative handbook is the first book dedicated solely to these two families, combining an exhaustive review of more than two centuries of literature with original observations by the author and many knowledgeable contributors. Antpittas and Gnateaters provides a thorough guide to the identification and ecology of these birds, with detailed maps accompanying the text. A series of superb plates illustrate most of the 156 recognized taxa; supplemented by more than 250 colour photographs, the immature plumages and natural history of many species are depicted for the first time. This book is the ultimate reference on these remarkable and beautiful birds, and an indispensable addition to the libraries of researchers and birders for many years to come.
