Predictability of Bird Community-Based Ecological Integrity using Landscape Measurements

نویسندگان

  • Glen D. Johnson
  • Wayne L. Myers
  • Ganapati P. Patil
  • Timothy J. O’Connell
  • Robert P. Brooks
چکیده

A fundamental premise of landscape ecology is that finer-scaled local ecological integrity is directly influenced by larger-scaled land use patterns. Therefore, characterizing landscape patterns that are mapped from satellite imagery may provide valuable covariate information about average integrity “on the ground”. This conjecture was evaluated in Pennsylvania for 102 watersheds where land cover patterns were represented by an eight-category raster map that was based on 30-meter resolution LANDSAT TM images. For each watershed, a suite of conventional landscape variables was obtained (McGarigal and Marks, 1995), along with a “conditional entropy profile”, which is a new technique for quantifying landscape fragmentation pattern over multiple measurement resolutions (Johnson and Patil, 1998; Johnson, et al., 1999). Ecological integrity for each watershed was assessed from data in the Pennsylvania Breeding Bird Atlas (Brauning, 1992) by computing bird community indices (BCIs), first based on songbird guilds only, then based on a much larger set of guilds that incorporated all species

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

A Trivalent Approach to the Quality of the “Khoshk” River Landscape in Shiraz

By considering certain factors like those mentioned by Ian Thompson (2005) in his definition of landscape, i.e. ecology, community and delight, in designing landscapes, one can find the vocation more applicable and useful. City rivers can play a very important role with regard to such values. In fact, the presence of nature and wildlife could not only be the lifeline of a city, but also a facto...

متن کامل

Distinguishing stressors acting on land bird communities in an urbanizing environment.

Urbanization has profound influences on ecological communities, but our understanding of causal mechanisms is limited by a lack of attention to its component stressors. Published research suggests that at landscape scales, habitat loss and fragmentation are the major drivers of community change, whereas at local scales, human activity and vegetation management are the primary stressors. Little ...

متن کامل

Quantifying relationships between bird and butterfly community shifts and environmental change.

Quantifying the manner in which ecological communities respond during a time of decreasing precipitation is a first step in understanding how they will respond to longer-term climate change. Here we coupled analysis of interannual variability in remotely sensed data with analyses of bird and butterfly community changes in montane meadow communities of the Greater Yellowstone Ecosystem. Landsat ...

متن کامل

Spatial heterogeneity increases diversity and stability in grassland bird communities.

Grasslands are inherently dynamic in space and time, evolving with frequent disturbance from fire and herbivores. As a consequence of human actions, many remaining grasslands have become homogenous, which has led to reduced ecosystem function, biodiversity loss, and decreased ecological services. Previous research has shown that restoring inherent heterogeneity to grasslands can increase avian ...

متن کامل

Evaluation of Ecological Vulnerability in Chelgard Mountainous Landscape

Although complexity and vulnerability assessment of mountain landscapes is increasingly taken into consideration, less attention is paid to ecophronesis-based solutions so as to reduce the fragile ecosystem vulnerability. The main propose of this study is to provide an insight of mountain complex landscape vulnerability and propose ecophronesis-based solutions in strategic planning framework fo...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2000