Demographics of the Golden-cheeked Warbler (Dendroica Chrysoparia) on Fort Hood, Texas
Demographics of the Golden-cheeked Warbler (Dendroica Chrysoparia) on Fort Hood, Texas

Author:

Publisher:

Published: 1998

Total Pages: 0

ISBN-13:

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The Golden-cheeked Warbler (Dendroica chrysoparia) is a federally endangered migratory passerine that has its breeding range contained in the central Texas area that includes Fort Hood. Its listing as endangered in 1991 was a result of the rapid degradation and increasing fragmentation of habitat, causing a decline in their population. To assist in conservation and recovery of the Golden-cheeked Warbler and comply with the Endangered Species Act, environmental managers need information on the demographic parameters of the population on Fort Hood. Researchers surveyed and documented the Golden-checked Warbler on Fort Hood, Texas between 1991 and 1996. The population remained relatively stable, with a slight decrease in 1996. The average return rate for males banded as adults was 45.5%; for males banded as juveniles the average was 16.9%. Dispersal distances for males banded as adults averaged 223 m. Dispersal distances for males banded as juveniles were significantly greater, with an average of 4,040 m. Densities of territorial males remained relatively stable between 1992 and 1996, with a peak density of 28 males per 100 ha (average of 18 males per 100 ha). Productivity of males within an intensive study area averaged 2.0 young per mated male.

Landscape Simulation Modeling
Landscape Simulation Modeling

Author: Robert Costanza

Publisher: Springer Science & Business Media

Published: 2006-06-02

Total Pages: 337

ISBN-13: 0387215557

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The world consists of many complex systems, ranging from our own bodies to ecosystems to economic systems. Despite their diversity, complex systems have many structural and functional features in common that can be effectively si- lated using powerful, user-friendly software. As a result, virtually anyone can - plore the nature of complex systems and their dynamical behavior under a range of assumptions and conditions. This ability to model dynamic systems is already having a powerful influence on teaching and studying complexity. The books in this series will promote this revolution in “systems thinking” by integrating computational skills of numeracy and techniques of dynamic mod- ing into a variety of disciplines. The unifying theme across the series will be the power and simplicity of the model-building process, and all books are designed to engage the reader in developing their own models for exploration of the dyn- ics of systems that are of interest to them. Modeling Dynamic Systems does not endorse any particular modeling paradigm or software. Rather, the volumes in the series will emphasize simplicity of lea- ing, expressive power, and the speed of execution as priorities that will facilitate deeper system understanding.

The Avian Migrant
The Avian Migrant

Author: John H. Rappole

Publisher: Columbia University Press

Published: 2013-06-11

Total Pages: 459

ISBN-13: 0231518633

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The purpose of migration, regardless of the distance involved, is to exploit two or more environments suitable for survival or reproduction over time, usually on a seasonal basis. Yet individual organisms can practice the phenomenon differently, and birds deploy unique patterns of movement over particular segments of time. Incorporating the latest research on bird migration, this concise, critical assessment offers contemporary readers a firm grasp of what defines an avian migrant, how the organism came to be, what is known about its behavior, and how we can resolve its enduring mysteries. John H. Rappole's sophisticated survey of field data clarifies key ecological, biological, physiological, navigational, and evolutionary concerns. He begins with the very first migrants, who traded a home environment of greater stability for one of greater seasonality, and uses the structure of the annual cycle to examine the difference between migratory birds and their resident counterparts. He ultimately connects these differences to evolutionary milestones that have shaped a migrant lifestyle through natural selection. Rather than catalogue and describe various aspects of bird migration, Rappole considers how the avian migrant fits within a larger ecological frame, enabling a richer understanding of the phenomenon and its critical role in sustaining a hospitable and productive environment. Rappole concludes with a focus on population biology and conservation across time periods, considering the link between bird migration and the spread of disease among birds and humans, and the effects of global warming on migrant breeding ranges, reaction norms, and macroecology.