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2000

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Full-Text Articles in Environmental Health and Protection

Preliminary Assessment Of Client Interest In And Needs Of The New England Environmental Finance Center, New England Environmental Finance Center, University Of Southern Maine Dec 2000

Preliminary Assessment Of Client Interest In And Needs Of The New England Environmental Finance Center, New England Environmental Finance Center, University Of Southern Maine

Planning

The New England Environmental Finance Center (NE/EFC) has been conceived as a knowledge-based clearinghouse, training, and change-agent program aimed at helping EPA's constituencies find financially successful approaches to environmental improvements. The NE/EFC will develop approaches to needs of particular priority in New England and potentially useful throughout the nation; share such approaches through the EFC national network; and help make tools from that network accessible throughout New England. In 1999 we began exploring with potential users how this ninth of the nation's EFCs might best address the region's needs. The assessment continued through the Muskie School's EFC proposal to EPA …


Ocena Zasięgu Istotnego Oddziaływania Emisji Zanieczyszczeń Z Huty Katowice Pod Kątem Likwidacji Strefy Ochronnej, Marian Mazur, Robert Oleniacz, Marek Bogacki Oct 2000

Ocena Zasięgu Istotnego Oddziaływania Emisji Zanieczyszczeń Z Huty Katowice Pod Kątem Likwidacji Strefy Ochronnej, Marian Mazur, Robert Oleniacz, Marek Bogacki

Robert Oleniacz

The paper presents the results of air quality impact assessment of Katowice Steelworks in Dąbrowa Górnicza (Poland) in the protective zone. On the basis of calculations, it was found that in terms of air pollution there is a reasonable possibility of complete elimination of existing protective zone around these industrial plants.

English title: Assessment of the extent of significant effects of pollutant emissions from the "Katowice" Steelworks in terms of liquidation of the environmental protection zone.


Scwds Briefs: Volume 16, Number 3 (October 2000) Oct 2000

Scwds Briefs: Volume 16, Number 3 (October 2000)

Southeastern Cooperative Wildlife Disease Study: Publications


• SCWDS Director Dr. Victor F. Nettles retired November 30, 2000, after a 28-year career at SCWDS.
• Former Montana Senator Dr. John Melcher recently wrote an article for the United States Animal Health Association Newsletter on "Wildlife Authority."
• 20 foxhounds at a Duchess County, New York, hunt club died or were euthanatized due to infection with the protozoan parasite Leishmania spp. of the donovani complex. Leishmaniasis is a zoonotic disease of humans and dogs caused by protozoa of the genus Leishmania.
• Controlling CWD in Captive Elk
• Drug Use Protocol for Wildlife
• West Nile Virus …


Pride Water Quality Assessment Report: I. Problems And Programs, Kentucky Water Resources Research Institute. University Of Kentucky Sep 2000

Pride Water Quality Assessment Report: I. Problems And Programs, Kentucky Water Resources Research Institute. University Of Kentucky

KWRRI Research Reports

This report provides an overview of the water quality problems and associated state and federal programs in the 40 counties that make up the PRIDE region. The 2000 Kentucky 305(b) stream assessment has identified over 1000 miles of impaired stream within the region. The major cause of pollution in the region is related to problems with pathogens. Much of these problems are related to straight pipes and failing septic and wastewater systems. It has been estimated that there are over 35,000 straight pipes and failing septic systems in the PRIDE region. A second major environmental impact in the region is …


Pride Water Quality Assessment Report: Ii. Chemical, Biological And Habitat Assessments, Kentucky Water Resources Research Institute, University Of Kentucky Sep 2000

Pride Water Quality Assessment Report: Ii. Chemical, Biological And Habitat Assessments, Kentucky Water Resources Research Institute, University Of Kentucky

KWRRI Research Reports

The efficient utilization of federal funds in improving the water quality and aquatic habitat of the region requires a mechanism for assessing and evaluating the impacts of the proposed and ongoing projects as well as some mechanism for prioritizing the allocation of additional funds. In order to evaluate the effectiveness of these projects it is important to provide a formal monitoring and assessment program based on sound scientific principles. This report provides an initial 10 year baseline assessment of the existing water quality conditions in the 40 county PRIDE·region for the purpose of evaluating the impacts of the PRIDE programs …


Jet Engine Certification Standards, Paul Eschenfelder Aug 2000

Jet Engine Certification Standards, Paul Eschenfelder

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

The ability of modern jet engines to ingest birds and continue to operate is largely misunderstood or not contemplated at all in the aviation industry. Currently, there is not one jet engine operating in the world that is certified to ingest one large bird (goose, swan, stork, pelican, vulture, etc) and continue to operate. The effort to harmonize bird ingestion rules between the FAA and JAA has failed. Controversy erupted in recent certification meetings regarding the database being used to certify engines. Additionally, should only rotating engine parts meet certain standards, or all engine parts exposed to impact meet standards? …


Wildlife Management Tools – What’S In Your Toolbox?, John E. Ostrom Aug 2000

Wildlife Management Tools – What’S In Your Toolbox?, John E. Ostrom

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

Airport managers of today are faced with a variety of choices of what tools to use to deal with their wildlife problems. The Airside Operations staff of the Minneapolis-St. Paul International Airport (MSP), has developed a “Wildlife Toolbox” which offers an assortment of programs, systems and devices to best deal with problem wildlife at a large northern tier hub airport. This “toolbox”, developed over time, includes not only the basics needed by an Airport Manager, but some rather unique tools that managers should consider when developing their own toolboxes.


Lasers As Nonlethal Avian Repellents: Preliminary Experiments, Bradley F. Blackwell, Glen E. Bernhardt Aug 2000

Lasers As Nonlethal Avian Repellents: Preliminary Experiments, Bradley F. Blackwell, Glen E. Bernhardt

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

Laser technology has recently been demonstrated as a potentially effective avian repellent; however, controlled studies have not been reported. We conducted 2-choice cage tests to quantify the effectiveness of low-power (10−60-mW) 633−650-nm lasers in preventing Brown-headed Cowbirds (Molothrus ater), European Starlings (Sturnus vulgaris), and Rock Doves (Columbia livia) from perching and Canada Geese (Branta canadensis) and Mallards (Anas platyrhynchos) from use of grass plots. In 3 experiments with stationary and moving laser beams “defending” a randomly selected perch, brown-headed cowbirds were not repelled, nor did they exhibit behaviors indicating perception …


Flight Control As A Goose Deterrent At Portland International Airport, Sharon Gordon, Noel Lyman Aug 2000

Flight Control As A Goose Deterrent At Portland International Airport, Sharon Gordon, Noel Lyman

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

Geese pose a threat to aircraft worldwide. The anthraquinone formula “Flight Control” (FC) is marketed as a deterrent to grazing geese, through an ultraviolet and post-ingestional repellency. The Port of Portland conducted a test to address six objectives regarding the effectiveness of Flight Control. A field with heavy goose activity was divided into five transects, two of which had goose activity 65 percent of the 22 days monitored. These two plots were sprayed using a mixture of one-half gallon of FC, five gallons of water, and eight ounces of an agricultural sticker. This was applied at a rate of one-half …


Canada Goose Management At The Minneapolis-St. Paul International And Downtown St. Paul Airports, James A. Cooper Aug 2000

Canada Goose Management At The Minneapolis-St. Paul International And Downtown St. Paul Airports, James A. Cooper

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

The Metropolitan Airports Commission initiated a Canada goose control program at the Minneapolis-St. Paul International Airport (MSP) in 1984, and the Downtown St. Paul Airport (DTSP) in 1994. Flightless geese within 16 km of these airports were trapped, neck-banded, and observed and counted weekly from September to December (MSP) and February (DTSP). Efficacy was measured by observing fall goose flights through the operations airspace in 1984-87, 1998-1999 (MSP) and 1994-1999 (DTSP). A total of 2,587 geese were removed from 36 MSP sites and 2,163 from 12 DTSP sites. From 1990 to 1999, 535 nests containing 2,637 eggs were destroyed and …


Bird Strike Trends And Bird Harassment Efforts In China, Zhou Ming Jun Aug 2000

Bird Strike Trends And Bird Harassment Efforts In China, Zhou Ming Jun

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

China is a large developing country. Under recent policies, the aviation industry has grown quickly. The bird-strike events have also increased rapidly, with 170 birdstrikes recorded from 1991 to 1997. The Civil Aviation Administration of China (CAAC) monitored these trends closely, and ABSAC was formed. We imported some products from the USA, which imitated a bird’s distress call, but these products didn’t work well in China. CAAC entrusted Tsinghua University to solve this problem. SBS company of Tsinghua University, led by Professor Xi Boa Shu took this task. For two years, SBS manufactured a series of products to prevent birdstrikes. …


Development Of A Bird Avoidance Model For Naval Air Facility El Centro, California, Edward Zakrajsek, John Bissonette, Tricia Cutler Aug 2000

Development Of A Bird Avoidance Model For Naval Air Facility El Centro, California, Edward Zakrajsek, John Bissonette, Tricia Cutler

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

Two weeks after the Elmendorf AFB-AWACS crash (22 September 1995), the US Navy lost an F-18 Hornet to a birdstrike at Naval Air Facility El Centro (NAFEC) in southern California. NAFEC is surrounded by agricultural land where crops are grown year round, and its location just 26-km south of the Salton Sea National Wildlife Refuge suggests a very high probability of additional serious birdstrikes in the future. We are developing a computer-based Bird-Avoidance Model for the airfield and its two associated bombing ranges, to decrease the number of damaging birdstrikes. We are currently conducting bird counts to assess the distribution …


Utility Of Tdwr And Asr-9 Data To Mitigate Bird Strikes At Commercial Airports, Mark A. Isaminger, Mark E. Weber Aug 2000

Utility Of Tdwr And Asr-9 Data To Mitigate Bird Strikes At Commercial Airports, Mark A. Isaminger, Mark E. Weber

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

Conflicts between birds and commercial aircraft are a noteworthy problem at both large and small airports. The risk factor for U.S. airports continues to increase due to the steady rise in take-off/landings and bird populations. The focus of bird strike mitigation in the past has centered primarily on Wildlife Management techniques. Recently, an Avian Hazard Advisory System (AHAS) has been developed to reduce the risks of bird strikes to military operations. This system uses a mosaic of data collected by the Next Generation Weather Radar (NEXRAD). This sensor serves as an excellent tool for enroute bird advisories due to the …


Potential Use Of On-Board Radar For Bird Detection And Avoidance, Pete Stephan Aug 2000

Potential Use Of On-Board Radar For Bird Detection And Avoidance, Pete Stephan

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

An approach to the reduction of military bird strike costs is proposed. Financial return-on-investment would be maximized by focusing on the most expensive bird strikes without requiring new investment in hardware. Most of the dollar cost of military bird strikes results from strikes in the military-unique high-speed/low-altitude flight regime over remote areas. Avoiding these birds motivates a short time from detection of the bird until the pilot avoidance response because single raptors are now causing a large fraction of the losses. Ground-based sensors with communications links to pilots would be expensive because of the geographic extent of the ranges where …


Deer Management At Airports: A Case Study, J. Harris Glass Aug 2000

Deer Management At Airports: A Case Study, J. Harris Glass

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

Deer living on and around airports pose a threat to aircraft. The consequence of a deer-aircraft strike can be serious and potentially tragic. Nationally, cervids (deer) accounted for 67% of all reported mammal-aircraft strikes and have caused damage in 81% of deer strikes in the United States (Cleary et al. 1999). Due to the potential for damage, the Federal Aviation Administration and USDA-APHIS-Wildlife Services (WS) program recommend a zero-tolerance of deer on an airfield. Deer densities at Newport News / Williamsburg International Airport (PHF) were as high as 171.5 deer/mi2 at the onset of the Wildlife Hazard Assessment conducted …


The Avian Hazard Advisory System (Ahas): Operational Use Of Weather Radar For Reducing Bird Strike Risk In North America, T. Adam Kelly, Ron Merritt, Andreas Smith, Mark Howera, Ron White Aug 2000

The Avian Hazard Advisory System (Ahas): Operational Use Of Weather Radar For Reducing Bird Strike Risk In North America, T. Adam Kelly, Ron Merritt, Andreas Smith, Mark Howera, Ron White

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

The Avian Hazard Advisory System (AHAS) was developed to use NEXRAD weather radar data and National Weather Service (NWS) weather data to forecast and monitor bird activity. The system was tested in a pilot study in 1998 and became operational for the eastern 1/3 of the USA in March 2000. Two thousand low level routes, ranges, airspace and military airfields are evaluated every hour. The monitoring of birds in near real time uses algorithms developed by Geo-Marine, Inc to isolate biological targets from weather. Removing the weather returns permits subsequent processing to retrieve information on bird strike risk to be …


Current Status Of The Usaf Bird Avoidance Model (Bam), Russell P. Defusco Aug 2000

Current Status Of The Usaf Bird Avoidance Model (Bam), Russell P. Defusco

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

The United States Air Force (USAF) Bird Aircraft Strike Hazard (BASH) Team has been developing versions of a Bird Avoidance Model (BAM) since the early 1980’s. In the developmental phases of the first models, it was recognized that avoiding birds on low-level routes and ranges was the only solution to the significant problem of bird strikes to these military operations nationwide. The early versions of BAM were limited in coverage, biological data, and resolution. With the advent of sophisticated Geographic Information System (GIS) technology and advances in computational capability, modern versions of the USAF BAM have become increasingly robust and …


The Relationship Between Bird Strikes And Weather: A Detailed Species Based Analysis, John Allan, Susan Manktelow, Jennifer Bell Aug 2000

The Relationship Between Bird Strikes And Weather: A Detailed Species Based Analysis, John Allan, Susan Manktelow, Jennifer Bell

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

Bird controllers have recognized for many years that the frequency of bird strikes is related in some way to weather conditions. Previous studies have demonstrated a relationship between bird strike frequency and rainfall on certain airfields. This paper takes bird strike data from five major UK airports and relates them to a variety of weather parameters. It then examines the relationships found on a species by species basis and uses differences in the ecology of the birds involved to suggest the mechanisms by which weather may influence bird strike frequency. The data can be used to better target bird control …


Faa Perspective On Future Directions Of Research And Development To Reduce The Bird Strike Threat, Michel J. Hovan, William J. Hughes Aug 2000

Faa Perspective On Future Directions Of Research And Development To Reduce The Bird Strike Threat, Michel J. Hovan, William J. Hughes

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

As bird strike risks keep increasing, the FAA is actively sponsoring research to minimize these risks. Bird strike risk reduction falls under the area of wildlife mitigation research. In this endeavor, FAA Research and Development faces challenges of budgetary and technical nature. From the budgetary standpoint, R&D funds were until recently very limited and the FAA could not carry out a comprehensive program in this area. Although still under funded, the wildlife mitigation R&D allocation has steadily improved and plans can now be made for the future. At the technical level, the areas of research for bird strike risks reductions …


Summary Of Bird Ingestions Into Aircraft Engines: Current Industry Activity And Bird Strike Reporting, Richard Parker Aug 2000

Summary Of Bird Ingestions Into Aircraft Engines: Current Industry Activity And Bird Strike Reporting, Richard Parker

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

This presentation will show some of the bird strikes and/or trends to engines in the past few years. The presentation will emphasize the safety aspects associated with aircraft engine bird ingestions and show the current statistics as understood by the engine manufacturers. The presentation will also address industry activity related to the hazard of larger birds. There will also be comments relative to the importance of accurate and complete bird strike reporting now that many agencies are reporting and collecting data.


Factors Associated With Damaging Bird Strikes For United States Air Force Aircraft, Christine A. Tedrow, Patrick F. Scanlon, James A. Parkhurst, Steve L. Mcmullin Aug 2000

Factors Associated With Damaging Bird Strikes For United States Air Force Aircraft, Christine A. Tedrow, Patrick F. Scanlon, James A. Parkhurst, Steve L. Mcmullin

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

Analysis of strike data is critical to determine the true economic costs of bird strikes, determine the magnitude of safety issues, and develop preventive measures. Analysis of USAF bird-strike data identified trends and indicated suggested relationships among factors contributing to damaging strikes. From FY 1988 through FY 1997, the annual mean was 2,668 bird strikes with peaks evident in fall and spring. Daylight and dusk were hazardous for bird strikes. More bird strikes occurred during airfield operations and when aircraft were operating at low altitudes (and when soaring birds were more numerous). Aircraft speed, phase of flight, taxonomic group, bird …


Federal Migratory Bird Permits And Airports, Marlys Bulander Aug 2000

Federal Migratory Bird Permits And Airports, Marlys Bulander

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

Federal regulations provide for issuance of permits to control damage or other “injury” being caused by migratory birds. The U.S. Fish and Wildlife Service works with USDA, APHIS, Wildlife Services and individual airports to minimize the likelihood of bird/aircraft collisions. This presentation explains the rules, regulations, and procedures related to federal migratory bird permits and the Service’s commitment to helping provide the tools necessary to help airports create bird-free air space.


Preliminary Results From Satellite And Vhf Tracking Of Relocated Red-Tailed Hawks At O’Hare International Airport, Laurence M. Schafer Aug 2000

Preliminary Results From Satellite And Vhf Tracking Of Relocated Red-Tailed Hawks At O’Hare International Airport, Laurence M. Schafer

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

Wildlife Services’ (WS) activities at O’Hare International Airport (ORD), 1997-1999, significantly reduced the annual number of wildlife strikes reported for ORD. The average annual number of reported strikes decreased from 104.2 (1992-1996) to 49 (1997-1999). However, the number of strikes involving red-tailed hawks (RTHA, Buteo jamaicensis) and American kestrels (AMKE, Falco sparverius) did not change (14.6 per year). On 1 January 1999, the Federal Aviation Administration sponsored a two-year study, in conjunction with the National Wildlife Research Center and WS-Illinois, to evaluate the efficacy of raptor relocation at ORD. All relocated RTHA were to be fitted with both …


Red-Tailed Hawk Translocation For Reducing Collisions With Aircraft, Matthew R. Bruggeman Aug 2000

Red-Tailed Hawk Translocation For Reducing Collisions With Aircraft, Matthew R. Bruggeman

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

Raptor translocation is currently being used by several airports to reduce collisions with aircraft. Changes in red-tailed hawk (Buteo jamaicensis) numbers and hawk/aircraft strikes were studied in relation to translocation of raptors at Eppley Airfield in Omaha, Nebraska from March 1999 through March 2000. The effect of distance on translocation success was also studied. Hawks were captured with pole traps, banded, and released approximately 80, 160, and 240 km from the airport. Two bird surveys were conducted at bimonthly intervals from April 1998 through March 1999, after which surveys were conducted at weekly intervals. These surveys provided an …


Reducing The Presence Of Raptors At Kansas City International Airport, Robert Johnson, Dan Mcmurtry Aug 2000

Reducing The Presence Of Raptors At Kansas City International Airport, Robert Johnson, Dan Mcmurtry

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

Nationwide, between 1991 and 1997, the FAA wildlife strike database reported 939 raptor strikes, which accounted for 12% of all reported wildlife strikes. At Kansas City International Airport (MCI), between 1997 and 1999, 9 raptor strikes occurred involving known aircraft and 27 raptor strikes occurred involving unknown aircraft. These raptor strikes represented 13% of all wildlife strike events at MCI. MCI has a large yearly influx of raptors (red-tailed hawks, American kestrels, northern harriers, and great horned owls) during the period of October through March. From October 1997 until December 1999, 40 raptors were removed from the airport through the …


Management Of Rodent Populations At Airports, Jessica Dewey, Gary W. Witmer Aug 2000

Management Of Rodent Populations At Airports, Jessica Dewey, Gary W. Witmer

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

Birds and other wildlife are a serious problem at U.S. airports. Certain species are more hazardous to aviation safety than others, most often due to the size and behavior of the species. Raptors, including hawks, vultures, and eagles, were the fourth most common bird group reported in bird strikes to the Federal Aviation Administration from 1991 - 1997, and hawks specifically were the fifth most common bird species group reported in bird strikes in Canada during the same time period. Red-tailed hawks were the fifth most common bird species reported in U.S. Air Force bird strikes from 1985 - 1999, …


Successful Actions For Avian Hazard Control In Brazil, Luiz Claudio Magalhaes Bastos Aug 2000

Successful Actions For Avian Hazard Control In Brazil, Luiz Claudio Magalhaes Bastos

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

Brazil built one of the world’s largest aeronautical infrastructures. The airport net is distributed along its vast territory, which shows a tremendous ecosystem variety. Having a large civilian aircraft fleet and also running second after Venezuela in catalogued bird species, Brazil has had problems related to bird strikes. Although Brazil has few problems with migratory birds, the threat posed by resident birds in some airports represents a significant risk. On the other hand, due to human population growth and poor policies of garbage disposal in the past, nowadays some big airports have in their vicinities open dumps that attract birds. …


An Evaluation Of Techniques For The Control Of Birds On Landfills Near Airports, John Allan, Andy Baxter Aug 2000

An Evaluation Of Techniques For The Control Of Birds On Landfills Near Airports, John Allan, Andy Baxter

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

This paper reports progress on an investigation of a variety of bird deterrent techniques on landfill sites. The objective of the study is to develop and test integrated bird management strategies for use on landfills, both close to airports and elsewhere. The first phase of the study is designed to evaluate individual techniques such as distress calls, pyrotechnics, falcons etc. to determine efficacy, time to habituation and differences in effectiveness for different pest bird species. Once the most promising techniques are identified they will be combined into integrated programs and tested long term on a various landfill sites across the …


Analysis Of The Use Of Radio-Controlled Models In Bird Dispersal, Nicholas B. Carter Aug 2000

Analysis Of The Use Of Radio-Controlled Models In Bird Dispersal, Nicholas B. Carter

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

Border Collie Rescue (BCR), in cooperation with the Dover Air Force Base, conducted a series of field trials to test the efficacy of utilizing radio-controlled models (“RCs”) (aircraft and boats) in dispersing several species of birds from troublesome locations around the Dover AFB environment. Results of these trials suggest that RCs can be used to effectively harass seagulls, raptors, ducks, and geese from difficult areas, though there are a number of limitations that must be taken into account when determining the value of instituting a harassment program utilizing RCs. Though use of Border Collies in its wildlife management program had …


High Return Rates For Relocated Red-Tailed Hawks: Preliminary Findings At Portland International Airport, Julie Fukuda, Carole Hallett Aug 2000

High Return Rates For Relocated Red-Tailed Hawks: Preliminary Findings At Portland International Airport, Julie Fukuda, Carole Hallett

Bird Strike Committee-USA/Canada Joint Annual Meeting: 2nd (2000)

Pacific Habitat Services, Inc. (PHS), under contract with the Port of Portland (Port), trapped, banded, and relocated red-tailed hawks at the Portland International Airport (PDX) in Portland, Oregon, beginning in October 1999. Although the Port has a program to deal with wildlife hazards to aircraft operations, raptor prey base management and hazing hadn’t effectively reduced wildlife hazards. Nineteen birdstrikes occurred in September, 1999. Prior to this season, birdstrikes ranged from 0 to 11 within a one-month period. Thus, immediate action was needed to reduce raptor abundance on the airfield. In fall and winter of 1999, PHS captured and relocated fifteen …